JP2022184060A - Airborne weather radar, aircraft and external - Google Patents

Abstract

An object of the present invention is to provide a technology such as an aircraft-mounted weather radar capable of realizing both weather observation for safe flight of aircraft and weather observation for reinforcement of weather observation. SOLUTION: To achieve the above object, an airborne weather radar according to the present technology includes an antenna and a control unit. The control unit performs first weather observation for observing the weather in a first area having directivity in the direction of travel of the aircraft with the antenna, and observes the weather in a second area different from the first area with the antenna. and a second weather observation observed by [Selection drawing] Fig. 3

Description

The present invention relates to technology such as airborne weather radar.

Since an aircraft is a vehicle that uses the atmosphere to fly, it is inevitable that weather has a great influence on its operation. Therefore, today's safe and secure aircraft operations are being carried out under various operational support based on meteorological observations and weather forecasts. Aircraft operations can be broadly divided into cruising phases and takeoff and landing phases. For the cruising phase, weather forecasts for several hours ahead are used, and for the takeoff and landing phases, weather observations (and one-hour extrapolation of weather observations) short-term prediction within

While aircraft thus benefit from weather observations and forecasts, they also contribute to enhancing weather observations and improving weather forecasts. Aircraft carry out on-the-spot observations of air pressure and temperature during flight, and the results of observations of the vertical distribution of such physical quantities (more precisely, the distribution along flight routes) contribute to improving the accuracy of weather forecasts. (see Non-Patent Document 1). In addition, it was reported that the number of flights in 2019 decreased sharply due to the spread of Covid-19, resulting in a decrease in the accuracy of weather forecasts (see Non-Patent Document 2).

Weather radar, by its nature, can obtain very detailed weather information in a short-range area, and loses that detail as the distance increases. As seen in recent research on weather radar networks, observation using multiple short-range radars expands the area that can be observed in detail and improves overall observation performance. Since aircraft used for civil air transport are basically equipped with weather radars, there are many weather radars in operation when looking at aircraft operations as a whole. (See Non-Patent Document 3).

James, E. P., and S. G. Benjamin, 2017: Observation system experiments with the hourly updating Rapid Refresh model using GSI hybrid ensemble-variational data assimilation. Mon. Wea. Rev., 145, 2897-2918, https://doi.org/ 10.1175/MWR-D-16-0398.1 James, Eric P., Stanley G. Benjamin, and Brian D. Jamison. "Commercial-Aircraft-Based Observations for NWP: Global Coverage, Data Impacts, and COVID-19", Journal of Applied Meteorology and Climatology 59, 11 (2020) ): 1809-1825, accessed Feb 2, 2021, https://doi.org/10.1175/JAMC-D-20-0010.1 D. J. McLaughlin, D. Pepyne, B. Philips, J. Kurose, M. Zink, D. Westbrook, et al., "Short-wavelength technology and the potential for distributed networks of small radar systems", Bull. Amer. Meteorol. Soc., vol. 90, no. 12, pp. 1797-1817, Dec. 2009. E. Yoshikawa et al., "MMSE Beam Forming on Fast-Scanning Phased Array Weather Radar," in IEEE Transactions on Geoscience and Remote Sensing, vol. 51, no. 5, pp. 3077-3088, May 2013, doi: 10.1109 /TGRS.2012.2211607. E. Yoshikawa, T. Ushio and H. Kikuchi, "A Study of Comb Beam Transmission on Phased Array Weather Radars," in IEEE Transactions on Geoscience and Remote Sensing, doi: 10.1109/TGRS.2020.3029875.

However, current airborne weather radars are specialized for the purpose of ensuring the safety of the aircraft on which they are mounted. The information is displayed on the on-board screen and discarded at the same time.

In view of the above circumstances, the purpose of this technology is to develop a technology such as an aircraft-mounted weather radar that can realize both weather observation for safe flight of aircraft and weather observation for reinforcement of weather observation. to provide.

To achieve the above object, an airborne weather radar according to the present technology includes an antenna and a control unit.
The control unit performs first weather observation for observing the weather in a first area having directivity in the direction of travel of the aircraft using the antenna, and observes the weather in a second area different from the first area using the antenna. and a second weather observation observed by

In this way, by executing the first weather observation and the second weather observation in the aircraft-mounted weather radar, the weather observation for safe flight of the aircraft and the weather observation for reinforcement of the weather observation, etc. can be performed. can be compatible with observation.

In the airborne weather radar, the antenna may be a phased array antenna.

In the aircraft-mounted weather radar, the control unit may perform the first weather observation and the second weather observation in a time-sharing manner.

In the aircraft-mounted weather radar, the control unit controls the phased array antenna to perform adaptive scanning in the second weather observation, thereby skipping non-specific areas in the second area. A specific area may be scanned.

In the airborne weather radar described above, the control unit may identify the specific area and the non-specific area in the second area before the adaptive scan in the second weather observation.

In the airborne weather radar, the control unit may specify the specific area and the non-specific area by scanning the entire second area with the phased antenna.

The aircraft-mounted weather radar may further include an imaging device that captures an image of the entire second region.
In this case, the control unit may specify the specific area and the non-specific area based on image information from the imaging device.

In the airborne weather radar, the specific area may be a precipitation area, and the non-specific area may be a non-precipitation area.

In the aircraft-mounted weather radar, the control unit may concurrently execute the first weather observation and the second weather observation.

In the airborne weather radar, the control unit may perform simultaneous observation of the first area and the second area by controlling the phased array antenna and performing angle imaging.

In the airborne weather radar, the second area may be wider than the first area.

The aircraft-mounted weather radar may further include a weather information processing unit for estimating weather conditions based on information obtained by the first weather observation and the second weather observation.

In the aircraft-mounted weather radar, receiving and collecting related information related to information obtained from at least the second weather observation out of the first weather observation or the second weather observation from each aircraft. A communication unit that transmits the related information to an external device may be further provided.

In the airborne weather radar, the external device may estimate overall weather conditions on the ground based on the relevant information from each aircraft.

An aircraft according to the present technology includes an airborne weather radar.
An airborne weather radar has an antenna and a controller. The control unit performs first weather observation for observing the weather in a first area having directivity in the direction of travel of the aircraft using the antenna, and observes the weather in a second area different from the first area using the antenna. and a second weather observation observed by

An external device according to the present technology includes an antenna, a first weather observation for observing weather in a first region having directivity in a direction of flight of an aircraft using the antenna, and a second weather observation that is different from the first region. from each aircraft equipped with an airborne weather radar having a second weather observation that observes the weather of the region with the antenna and a control unit that performs the first weather observation or the second weather observation , an external device that receives and collects relevant information related to at least the information obtained from said second weather observation.

As described above, according to the present technology, it is possible to provide a technology such as an aircraft-mounted weather radar capable of realizing both weather observation for safe flight of aircraft and weather observation for reinforcement of weather observation. can be done.

1 is a diagram showing a weather observation system according to a first embodiment of the present technology; FIG. FIG. 4 is a top view showing a first region observed by a first weather observation and a second region observed by a second weather observation; FIG. 4 is a side view showing a first region observed by a first weather observation and a second region observed by a second weather observation; It is a time series diagram of the first weather observation and the second weather observation. It is a figure which shows a mode when adaptive scanning skips a non-precipitation area (area|regions other than a precipitation area), and scans only a precipitation area. It is a flow chart which shows an example of processing of a control part in the 2nd weather observation. 9 is a flowchart showing another example of processing of the control unit 12 in second weather observation. FIG. 10 is a diagram showing a state when angle imaging is being performed;

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<<First embodiment>>
<Overall Configuration of Meteorological Observation System>
FIG. 1 is a diagram showing a weather observation system 100 according to the first embodiment of the present technology. As shown in FIG. 1 , the weather observation system 100 includes an airborne weather radar 10 , an external device 20 and a weather observation device 30 .

The aircraft-mounted weather radar 10 is mounted on each aircraft 1 and used. The external device 20 is installed and used in, for example, an operating company of the aircraft 1, a company that provides weather information services, a government agency (the Meteorological Agency), or the like. The external device 20 receives and collects weather observation information observed by each aircraft 1 from each aircraft 1, and estimates the overall weather conditions on the ground. The weather observation device 30 is, for example, a ground-based weather radar, a wind profiler, a radiosonde, or the like. Note that the weather observation device 30 can be omitted.

[Airborne weather radar 10]
Airborne weather radar 10 has radar unit 13 , weather information processing unit 14 , current weather display unit 15 , forecast weather display unit 16 , and communication unit 17 .

(Radar unit 13)
Radar section 13 includes phased array antenna 11 and control section 12 that controls phased array antenna 11 .

The control unit 12 is realized by hardware or a combination of hardware and software. The hardware is configured as part or all of the control unit 12, and the hardware includes a CPU (Central Processing Unit), DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), ASIC (Application Specific Integrated Circuit ), or a combination of two or more of these. Note that this also applies to the weather information processing unit 14 in the aircraft-mounted weather radar 10 and the weather information processing unit 24 in the external device 20 .

In this embodiment, the control unit 12 controls the phased array antenna 11 to perform the first weather observation and the second weather observation. The first meteorological observation is meteorological observation for safe flight of the aircraft 1 . The second meteorological observation is meteorological observation for reinforcement of meteorological observation, improvement of meteorological forecast, and the like. Note that the second weather observation is typically a global weather observation of about 12 km or less where the weather phenomenon exists.

Note that the observed quantity obtained by the first meteorological observation and the second meteorological observation is typically a radar reflection factor. In addition, the observed quantity may include Doppler velocity, Doppler velocity width, reflection factor difference, inter-polarization correlation coefficient, inter-polarization phase difference, and specific inter-polarization phase difference.

2 and 3 are a top view and a side view, respectively, showing a first region R1 observed by the first meteorological observation and a second region R2 observed by the second meteorological observation.

As shown in FIGS. 2 and 3, the first area R1 observed by the first weather observation is a certain area having directivity in the direction in which the aircraft 1 travels. Further, as shown in FIGS. 2 and 3, the second region R2 observed by the second meteorological observation is a region different from the first region R1 (directivity in a direction different from that of the first region R1). ) and is wider than the second region R2. In other words, in the second meteorological observation, in order to reinforce the meteorological observation and improve the meteorological forecast, meteorological observation is carried out over the widest possible area, such as the entire underside of the aircraft 1, instead of the narrow area in front of the aircraft 1 only.

The first region R1 and the second region radially spread from the vicinity of the tip of the aircraft 1 (the mounting position of the phased array antenna 11). The angle θ1 (see FIG. 2) around the vertical axis in the first region R1 is, for example, about ±50° to ±60° with respect to the front direction of the aircraft 1. As shown in FIG. Also, the angle φ1 (see FIG. 3) about the horizontal axis (horizontal direction axis) in the first region R1 is, for example, about ±5° to ±10° with respect to the front direction of the aircraft 1 .

Also, the angle θ2 (see FIG. 2) about the vertical axis in the second region R2 is, for example, about ±75° to ±90° with respect to the front direction of the aircraft 1. Further, the angle φ2 (see FIG. 3) about the horizontal axis (horizontal direction axis) in the second region R2 is, for example, about ±20° to ±30° with respect to the direction of the depression angle of 40° to 60°. be done.

In the example shown in FIGS. 2 and 3, the second area R2 is the lower side of the aircraft 1, but the second area R2 is the upper side, the right side, the left side, and the rear side of the aircraft 1. I don't mind. Typically, the second region R2 may be any region as long as it is a region different from the first region R1 (and is wider than the second region R2). .

Here, if only the first weather observation and the second weather observation are performed, the radar unit 13 for the first weather observation and the radar unit 13 for the second weather observation should be separately provided. Just do it. However, in the case where two separate radar units 13 are provided in this way, the cost, weight, size, etc. increase, making it difficult to mount the radar units 13 on the aircraft 1 . Therefore, in this embodiment, the single radar unit 13 realizes the first weather observation and the second weather observation.

Further, in the present embodiment, the control unit 12 alternately and repeatedly performs the first weather observation and the second weather observation in a time division manner. FIG. 4 is a time series diagram of the first weather observation and the second weather observation.

The period t1 in the first weather observation is typically several seconds to several tens of seconds. Also, the period t2 in the second meteorological observation is typically about several seconds (a period that does not impair the flight safety of the aircraft 1). Also, the period T from the previous second weather observation to the current second weather observation is typically several seconds to several tens of seconds.

Here, in the case where the first meteorological observation and the second meteorological observation are alternately and repeatedly performed in a time division manner as in the present embodiment, there are the following problems. In other words, while weather observation of the second region R2 is being performed in the second weather observation, weather observation of the first region R1 cannot be performed, and flight safety of the aircraft 1 is reduced.

Therefore, in this embodiment, the control unit 12 controls the phased array antenna 11 to perform adaptive scanning in order to complete the second weather observation in a short period of time and at high speed.

Describe adaptive scanning. Adaptive scanning is a technique of scanning only a specific area and skipping areas other than the specific area (non-specific area). This adaptive scan is a technique that utilizes the advantage of being able to change the antenna directivity instantaneously by electronic scanning using the phased array antenna 11 .

Adaptive scanning by the phased array antenna 11 can perform scanning at a higher speed than mechanical scanning by a mechanical movable antenna. In the case of mechanical scanning with a mechanical movable antenna, it is impossible to skip non-specific areas due to inertia.

In the present embodiment, the control unit 12 skips non-precipitation areas (areas other than precipitation areas) by adaptive scanning in the second weather observation, and Execute processing such as scanning only the area where the light is falling.

FIG. 5 is a diagram showing a state in which non-precipitation areas are skipped and only precipitation areas are scanned by adaptive scanning.

Here, in order to skip the non-precipitation area and scan only the precipitation area, it is necessary to know in which direction the precipitation area exists (the angular distribution of the presence or absence of precipitation). That is, it is necessary to identify the precipitation area and the non-precipitation area before the adaptive scan.

There are two methods for this method. In the first method, the control unit 12 controls the phased array antenna 11 in the second meteorological observation, scans the entire second region R2, and identifies the precipitation area and the non-precipitation area. It is a way to The presence or absence of precipitation can be determined in a very short period of time compared to observation of the intensity of precipitation, etc., so this is consistent with the purpose of completing the second meteorological observation in as short a time as possible.

Detailed meteorological observations ( second meteorological observation). In this case, in the second meteorological observation, it is possible to focus observation on the periphery of the region where the change is remarkable, or to determine the precipitation area to be observed later based on the short-term prediction of the precipitation area.

A second method is a method in which the control unit 12 specifies a raining area and a non-raining area based on image information from an imaging device (optical camera) that captures the entire second region R2 in the second weather observation. is. In this case, an imaging device is further added to the airborne weather radar 10 .

Although it is not so easy to discriminate between rainfall and non-precipitation areas based on image information, it is thought that the accuracy of the discrimination can be improved by a discrimination algorithm using machine learning. Note that the imaging device may be a camera or the like capable of imaging not only visible light but also infrared light and ultraviolet light. Also, the imaging device may be a multispectral camera or a hyperspectral camera capable of imaging light of multiple wavelengths.

FIG. 6 is a flow chart showing an example of processing of the control unit 12 in the second weather observation. FIG. 7 is a flow chart showing another example of the processing of the control unit 12 in the second weather observation. The flowchart shown in FIG. 6 corresponds to the first method described above, and the flowchart shown in FIG. 7 corresponds to the second method described above.

Referring to FIG. 6, in the second meteorological observation, control unit 12 controls phased array antenna 11 to scan the entire second region R2 at high speed, thereby detecting precipitation and non-precipitation regions. Identify (step 101). Next, the control part 12 is controlling the phased array antenna 11, performs an adaptive scan, skips a non-precipitation area, and scans a precipitation area. Steps 101 and 102 may be repeated multiple times during one second weather observation (period t2). In this case, from the second round onwards, instead of step 101, the control unit 12 may predict the short-term movement of clouds to identify the raining area and the non-raining area.

Referring to FIG. 7, control unit 12 obtains an image of the entire second region R2 from the imaging device in the second weather observation (step 201). Next, the control unit 12 identifies a raining area and a non-raining area based on the image (step 202). Next, the control unit 12 controls the phased array antenna 11 to perform an adaptive scan, skip the non-precipitation area and scan the precipitation area (step 203). Steps 201 to 203 may be repeated multiple times during one second weather observation (period t2).

(Weather information processing unit 14)
Refer to FIG. 1 again. The weather information processing unit 14 acquires the observation information obtained by the first weather observation and the observation information obtained by the second weather observation from the radar unit 13, data-processes these observation information, and presents or Predict future weather conditions.

Here, the data processing includes (1) correcting observation information using the airborne weather radar 10 itself or other equipment, (2) calculating physical quantities based on the observation information, and (3 ) to estimate future weather conditions.

Specifically, (1) removes the influence of the motion of the aircraft 1 from the Doppler velocity and the Doppler velocity range by always grasping the ground velocity from the reflection from the ground surface.

For (2), calculation of precipitation by empirical formula from radar reflection factor and relative phase difference between polarizations, calculation of wind direction and speed from spatial distribution of Doppler velocity by inverse problem solution, etc., reflection factor difference, deviation Precipitation particles are discriminated by machine learning based on inter-wave correlation coefficients, specific inter-polarization phase differences, and the like. (3) can be realized by time extrapolation of observation information using an autoregressive model, assimilation with a weather model, or the like. These processes may be performed in consideration of the overall weather conditions on the ground obtained from the external device 20 via the communication unit 17 .

(Current weather display unit 15)
The current weather display section 15 displays the current weather conditions estimated by the weather information processing section 14 .

(Predicted weather display unit 16)
The current weather display unit 15 displays future weather conditions estimated by the weather information processing unit 14 .

(Communication unit 17)
The communication unit 17 transmits the current or future weather conditions (related information) estimated by the weather information processing unit 14 based on the first weather observation and the second weather observation to the external device 20 . Note that the communication unit 17 may transmit the observation information obtained by the first weather observation and the observation information (related information) obtained by the second weather observation to the external device 20 as they are. In this case, the data processing in (1) to (3) above may be executed on the external device 20 side.

In the example here, the case where both the information based on the first weather observation and the information based on the second weather observation are transmitted from the aircraft 1 to the external device 20 has been described. On the other hand, among these, only information based on the second weather information can also be transmitted to the external device 20 .

[External device 20]
The external device 20 has a weather information processing section 24 , a current weather display section 25 , a forecast weather display section 26 and a communication section 27 .

(Weather information processing unit 24)
Based on both the observation information received from each weather observation device 30 (ground-mounted weather radar, etc.) and the information on the weather conditions received from each aircraft 1, the weather information processing unit 24 predicts the current or future overall situation on the ground. guess the weather conditions.

1. Estimation of Current Weather Conditions For example, the observation area of the weather observation device 30 and the observation area of the aircraft 1 may overlap. In this case, the weather information processing unit 24 can improve the accuracy of weather condition estimation by combining the two by maximum likelihood estimation or the like.

Further, for example, the aircraft 1 may fly in an unobserved area (for example, sea) by the weather observation device 30 . In this case, based on the information on the weather conditions from the aircraft 1, the weather conditions in the unobserved area can be filled. Information on the unobserved area of the weather observation device 30 is transmitted in advance from the external device 20 side to the aircraft 1 side, and the second weather observation is performed only when the aircraft 1 enters the unobserved area. can also be

Note that the meteorological observation device 30 can be omitted, and in this case, it becomes possible to deal with the weather for the first time based on the observation information received from each aircraft 1 .

2. Prediction of future weather conditions Both the observation information from the weather observation device 30 and the weather condition information from each aircraft 1 provide highly accurate weather conditions with few unobserved areas. Therefore, the weather information processing unit 24 can estimate the future weather conditions with high accuracy by, for example, performing time extrapolation using an autoregression model for the weather conditions with high accuracy and few unobserved areas. Become.

In addition, by assimilating information on weather conditions from the aircraft 1 into the weather model, weather forecasting can be performed (in the absence of the weather observation device 30), or the accuracy of weather forecasting can be improved. (When the weather observation device 30 is present).

(Current weather display unit 25)
The current weather display section 25 displays the current weather conditions estimated by the weather information processing section 24 .

(Predicted weather display unit 26)
The predicted weather display section 26 displays future weather conditions estimated by the weather information processing section 24 .
(Communication unit 27)

The communication unit 27 transmits the current or future overall weather conditions on the ground estimated by the weather information processing unit 24 to each aircraft 1 . The communication unit 27 also receives observation information from the weather observation device 30 . Note that the communication unit 27 may transmit the observation information from the weather observation device 30 to each aircraft 1 as it is.

<Action, etc.>
As described above, in this embodiment, the airborne weather radar 10 performs the first weather observation and the second weather observation. As a result, it is possible to achieve both meteorological observation for safe flight of the aircraft 1 and meteorological observation for reinforcement of meteorological observation, improvement of meteorological prediction, and the like.

Moreover, in this embodiment, since the first weather observation and the second weather observation are realized by a single weather radar (radar unit 13), cost, weight, and size can be reduced. Also, since the adaptive scan is executed in the second weather observation, the period t2 of the second weather observation can be shortened. Therefore, the second weather observation can be performed while maintaining flight safety of the aircraft 1 .

Here, weather prediction is utilized in an extremely wide range of fields, and it can be said that the economic effect of its improvement is extremely high. High-speed scanning technology represented by adaptive scanning and angle imaging, which will be described later, has not been realized in the airborne weather radar 10 so far. It is becoming practical.

In addition, it is considered that there are no particular difficulties peculiar to the aircraft 1 platform. Regarding the communication technology that connects the aircraft and the ground, standardization is insufficient in the aviation industry, and the level of technology used is extremely low compared to the general public. This problem is considered to be a bottleneck in the industrialization of this technology. There is a good chance that it will be resolved early.

<<Second embodiment>>
Next, a second embodiment of the present technology will be described. In the first embodiment described above, a case has been described in which the first weather observation and the second weather observation are performed alternately and repeatedly in a time division manner. On the other hand, in the second embodiment, the first meteorological observation and the second meteorological observation are simultaneously performed in parallel.

Typically, in the second embodiment, the control unit 12 performs simultaneous observation of the first region R1 and the second region R2 by controlling the phased array antenna 11 to perform angle imaging.

Angle imaging will be explained. The phased array antenna 11 can form various antenna directivities. Angle imaging utilizes this feature to simultaneously observe multiple directions. With this angle imaging, the first weather observation and the second weather observation can be performed simultaneously.

FIG. 8 is a side view showing how the first weather observation and the second weather observation are simultaneously performed by angle imaging. In angle imaging, electromagnetic waves are radiated simultaneously in multiple directions, and scattered signals from precipitation areas are received. The received scattered signal is a mixed signal of scattered signals from all directions in which the electromagnetic waves are irradiated, and digital beamforming is used to obtain each scattered signal separately. The angle imaging technique is disclosed in Non-Patent Document 4 and Non-Patent Document 5 above.

In the second embodiment, the first meteorological observation and the second meteorological observation are simultaneously performed in parallel, so that the flight safety of the aircraft 1 is not compromised.

≪Others≫
Adaptive scanning and angle imaging can be used together, so that advantages of both (short-time observation and simultaneous observation in multiple directions) can be enjoyed at the same time. In other words, by using both together, after identifying the direction in which the precipitation area exists, it is possible to simultaneously observe a plurality of directions in which the precipitation area exists. Furthermore, since the first weather observation and the second weather observation are simultaneously performed in parallel, the flight safety of the aircraft 1 is not compromised.

DESCRIPTION OF SYMBOLS 1... Aircraft 10... Aircraft-mounted weather radar 11... Phased antenna 12... Control part 13... Radar part 20... External device 30... Weather observation apparatus 100... Weather observation system

Claims (16)

an antenna;
A first weather observation for observing the weather in a first area having directivity in the direction of travel of the aircraft with the antenna, and a second observation for observing the weather in a second area different from the first area with the antenna. an airborne weather radar, comprising: a controller for performing weather observations; An aircraft-mounted weather radar according to claim 1,
The airborne weather radar, wherein the antenna is a phased array antenna. An aircraft-mounted weather radar according to claim 2,
The airborne weather radar, wherein the control unit executes the first weather observation and the second weather observation in a time-sharing manner. An aircraft-mounted weather radar according to claim 3,
In the second meteorological observation, the control unit controls the phased array antenna to perform an adaptive scan, thereby skipping a non-specific area and scanning a specific area in the second area. weather radar. An aircraft-mounted weather radar according to claim 4,
The airborne weather radar, wherein the control unit identifies the specific area and the non-specific area in the second area before the adaptive scan in the second weather observation. An aircraft-mounted weather radar according to claim 5,
The airborne weather radar, wherein the control unit identifies the specific area and the non-specific area by scanning the entire second area with the phased antenna. An aircraft-mounted weather radar according to claim 5,
further comprising an imaging device that captures an image of the entire second region;
The airborne weather radar, wherein the control unit identifies the specific area and the non-specific area based on image information from the imaging device. The aircraft-mounted weather radar according to any one of claims 4 to 7,
The specific area is a precipitation area, and the non-specific area is a non-precipitation area. Airborne weather radar. An aircraft-mounted weather radar according to claim 2,
The airborne weather radar, wherein the control unit executes the first weather observation and the second weather observation simultaneously in parallel. An aircraft-mounted weather radar according to claim 9,
The airborne weather radar, wherein the control unit performs simultaneous observation of the first area and the second area by controlling the phased array antenna to perform angle imaging. An airborne weather radar according to any one of claims 1 to 9,
The airborne weather radar, wherein the second area is wider than the first area. An aircraft-mounted weather radar according to any one of claims 1 to 11,
An airborne weather radar, further comprising: a weather information processing unit for estimating weather conditions based on the first weather information and the information obtained by the second weather observation. An aircraft-mounted weather radar according to any one of claims 1 to 12,
of the first meteorological observation or the second meteorological observation, to an external device that receives and collects relevant information related to at least the information obtained from the second meteorological observation from each aircraft; An airborne weather radar further comprising a communication unit for transmitting information. An airborne weather radar according to claim 13,
The airborne weather radar, wherein the external device estimates overall weather conditions on the ground based on the relevant information from each aircraft. An antenna, first weather observation for observing weather in a first region having directivity in the direction of flight of the aircraft with the antenna, and observation of weather in a second region different from the first region with the antenna an airborne weather radar having: a second weather observation; and a control for performing a second weather observation. An antenna, first weather observation for observing weather in a first region having directivity in the direction of flight of the aircraft with the antenna, and observation of weather in a second region different from the first region with the antenna at least the second weather observation, out of the first weather observation or the second weather observation, from each aircraft equipped with an airborne weather radar having a control unit that performs a second weather observation An external device that receives and collects relevant information related to the information obtained in

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