JP2001119227A - Radio transmission method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] An air-drop radio device has conventionally been radio-transmitted by a non-directional antenna, and has a drawback that the output of the transmitter cannot be sufficiently utilized compared to the use of a directional antenna. SOLUTION: An air-drop radio device 1 provided with a directional antenna 3 is dropped from a launch vehicle, an aircraft, or the like, and a radio wave is transmitted from the radio device 1 during the drop. In the radio wave transmission method for receiving radio waves, the air-drop radio device 1 is equipped with a geomagnetic sensor 7 for acquiring its own azimuth in the air, and the directional antenna 3 is directed toward the receiving station with the azimuth as its reference. On the occasion,
The minimum operation angle toward the receiving station is calculated from either the forward rotation or the reverse rotation of the directional antenna 3, and the rotation of the directional antenna 3 is controlled in accordance with the minimum operation angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transmitting radio waves during a fall by dropping from a launch vehicle, an aircraft, or the like, and receiving the radio waves at a mobile unit (car, aircraft, flying object, ship, etc.) or a receiving station on the ground. The present invention relates to a radio wave transmission method intended to perform The term "receiving station" used herein includes a case where a receiving station for jamming radio waves not intended for receiving from the apparatus of the present invention is intended.

[0002]

2. Description of the Related Art Radio waves are transmitted while falling from a conventional launch vehicle or aircraft, and received by a mobile unit (car, aircraft, flying object, ship, etc.) or a receiving station on the ground. As a target radio wave transmission method, there has been a radio wave transmission method in which omnidirectional transmission is performed using an omni-directional antenna with its own azimuth reference unknown. The configuration is shown in FIG. In FIG. 7, 1 is an air-drop radio device, 4 is a transmitter mounted therein, 14 is a non-directional antenna, 8 is a parachute, 9 is a transmission radio wave, and 2 is a receiving station.

[0003] In addition to the above configuration, for example, a gyroscope circuit is provided inside the device, and the cumulative rotation angle from a state in which the reference azimuth is known is integrated and calculated, and the self azimuth angle reference when floating in the air is calculated. The method used, and furthermore, self-azimuth reference detection by a geomagnetic sensor, but for the purpose of finding the number of revolutions, when applied to antenna directivity control, etc.
Instead of using the reference azimuth, there has been a method in which the directional antenna is reversely rotated by an amount equivalent to the measurement and accumulation of the self-rotational speed instead of the gyroscope device.

[0004]

Conventionally, there have been many radio wave transmissions by radio equipment from airborne vehicles such as airplanes and balloons in communication and the like.
Small rockets equipped with airdrops that have parachute and stable wings from aircraft and balloons, and radio wave transmission devices such as transmission of observation data and radio wave jamming devices, using technology to reduce the size and weight of electrical equipment. A shell is present.

Conventionally, these devices have been conventionally used for reasons such as a reduction in size and weight due to mounting restrictions, a reduction in the cost of the device, and the fact that it is not easy to obtain their own azimuth reference during airdrop.
An omnidirectional antenna 14 as shown in FIG. 7 has been adopted, and a method of transmitting radio waves in all directions has been adopted. In this case,
Since the output of the transmitter 4 is omnidirectional radiation as compared with the directional antenna, there is a problem that a weak radio wave must be transmitted to a specific receiving station.

Further, the self-azimuth reference calculation method by integration or integration calculation combining a gyroscope circuit or a geomagnetic sensor with semiconductor memory storage has a problem that errors are significantly accumulated in integration and integration.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a method capable of transmitting a radio wave stronger than a nondirectional antenna to a receiving station even when the same transmitter is used. An object of the present invention is to provide a radio wave transmission method that can improve the degree of directivity and can transmit a strong radio wave as compared with a conventional transmission method using a directional antenna.

[0008]

According to a radio transmission method according to the present invention, an air-drop radio device equipped with a directional antenna is dropped from a launch vehicle or an aircraft, and radio waves are transmitted from the radio device during the fall. Mobile objects (cars, aircraft,
(E.g., flying objects, ships, etc.) and receiving stations on the ground, airborne radio equipment is equipped with a geomagnetic sensor to acquire its own orientation in the air, and the orientation of this geomagnetic sensor is used as a self-reference. When directing the directional antenna toward the receiving station, the minimum operation angle toward the receiving station is calculated from either the forward rotation or the reverse rotation of the directional antenna, and the rotation of the directional antenna axis is controlled according to the minimum operation angle. Is performed.

[0009] Further, a remote azimuth operation receiving unit is mounted on the air-drop radio device, and through this remote azimuth operation receiving unit, antenna axis rotation control is performed at any time separately from the antenna axis rotation control by the geomagnetic sensor to control the directional antenna. The direction can be changed.

In addition, the antenna axis rotation is controlled in accordance with a change in the output data of the geomagnetic sensor due to the self-rotation of the dropped air-drop radio equipment, so that the directional antenna is directed toward the receiving station.

Also, based on the history of the output data of the geomagnetic sensor due to the self-rotation of the falling air-drop radio equipment, the tendency of the self-rotation of the falling air-drop radio equipment (constant angular velocity,
Calculates and predicts constant torsional vibration, torsional damping vibration, etc., which are likely to occur at constant angular acceleration, parachute descent, etc.), controls the antenna axis rotation based on this predicted value and the output of the geomagnetic sensor, and moves the directional antenna toward the receiving station. It is intended to turn to.

Also, a remote azimuth operation receiving section is provided, and through this remote azimuth operation receiving section, antenna axis rotation control can be performed at any time separately from the antenna axis rotation control by the geomagnetic sensor so that the direction of the directional antenna can be changed. is there.

In addition, an air-drop radio device equipped with a directional antenna is dropped from a launch vehicle, an aircraft, or the like, and a radio wave is transmitted from the radio device while the radio device is falling, and the mobile device (car, aircraft, flying object, ship) The above-mentioned air-drop radio equipment has a propeller or a rotation stabilizing wing, and a plurality of or a single directional antenna from the directional antenna of the air-drop electronic equipment rotates every rotation of the air-drop electronic equipment. The radio wave is transmitted to the receiving station.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1 of the present invention will be described with reference to the drawings. In FIG. 1, 1 is an air-drop radio device, 2 is a receiving station, 3 is a directional antenna mounted on the air-drop radio device 1, 4 is a transmitter, 5 is a motor, and 6 is an antenna axis rotation control unit. , 7 are geomagnetic sensors. 8 is a parachute, 9 is a transmission radio wave radiated from the directional antenna 3.

Next, the operation will be described. In the first embodiment, the air-drop radio device 1 that is dropped by the parachute 8 is shown as an example, but the transmitter 4, the geomagnetic sensor 7, the antenna shaft rotation control unit 6, the motor 5, the directivity Any type of drop-type radio equipment may be used as long as the antenna 3 is mounted and the direction of the receiving station from the drop location is stored in advance in the antenna axis rotation control unit 6 as data.

During the fall, the air-drop radio device 1 loses its own orientation relative to the ground.
For example, the reference direction such as north is unknown. Therefore, the direction of magnetic north is determined by the geomagnetic sensor 7, and the direction in which the directional antenna 3 is directed is rotated forward or backward by the antenna axis rotation control unit 6 based on the direction. And the rotation angle is calculated several times, and the motor 5 is required only according to the minimum operation angle.
To rotate. Here, the deviation between magnetic north and true north may be calculated and corrected inside the antenna axis rotation control unit 6. Note that a series of methods for rotating the directional antenna 3 from the geomagnetic sensor 7 via the antenna axis control unit 6 may be either an analog control circuit or a digital control circuit using software. Further, the control circuit may or may not include a feedback circuit.

In the transmission method having such a configuration, the directional antenna 3 always emits a transmission radio wave toward the receiving station 2 after the air-drop radio device 1 is dropped, and the reception radio wave existing in a specific direction is received. The directional antenna 3 can radiate the strong transmission radio wave 9 to the station 2.

Embodiment 2 FIG. FIG. 2 shows a second embodiment of the present invention, in which 10 is a mobile receiving station, 1
Reference numeral 1 denotes a remote azimuth operation receiving unit mounted on the air-drop radio device 1, and reference numeral 12 denotes a remote azimuth operation transmitting unit installed on the ground, for example.

In the first embodiment, when the air-drop radio device 1 is swept by the wind during a fall to change the azimuth with the receiving station, or when the mobile receiving station 10 moves before the drop or during the drop, Although the directional antenna 3 deviates from the azimuth direction of the receiving station 10, the remote azimuth operation including the external antenna installed on the ground or the like is performed by the remote azimuth operation receiving unit 11 including the antenna mounted on the airborne radio wave device 1. The transmitting unit 12 transmits data of the new receiving station direction to the antenna axis rotation control unit 6 to update the data, and directs the directional antenna 3 toward the mobile receiving station 10 more accurately. It is possible to emit radiation.

Embodiment 3 FIG. 3 shows a third embodiment of the present invention. In this embodiment, the acquisition of magnetic north by the geomagnetic sensor 7 is repeated during a fall, so that the directional deviation of the directional antenna is corrected even for the self-rotation of the air-drop radio device 1 during the fall. It is. In FIG. 3, when the air-drop radio device 1 rotates as indicated by an arrow A, the antenna axis rotation control unit 6 is controlled by the output of the geomagnetic sensor 7, the direction of the directional antenna 3 is corrected as needed, and the receiving station is constantly controlled. Turn to the direction of 2.

Embodiment 4 FIG. FIG. 4 shows a fourth embodiment of the present invention. In the figure, 13 is a propeller or a rotation stabilizing wing, 15 is a predictive control calculation unit mounted on the air-drop radio equipment 1, FIG. 3 (a) shows an example of torsional vibration drop, and FIG. An example of dropping an angular velocity or a constant angular acceleration is shown.

In the fourth embodiment, as in the third embodiment, the acquisition of magnetic north by the magnetic sensor 7 is repeated during the fall, so that the history of the acquired data of the geomagnetic sensor 7 allows the The tendency of the rotational movement (constant angular velocity movement, constant angular acceleration movement, constant torsional vibration movement, torsional damping vibration movement, etc.) is read, and the predicted angle 16 (shown by a broken line) of the instantaneous self-rotation angle is calculated by the prediction control calculation unit 15. By calculating and predicting and correcting the azimuth deviation of the directional antenna 3 with a predicted value in advance, it is possible to reduce the time delay of the correction and correct the correction more accurately.

Embodiment 5 FIG. 5 shows a fifth embodiment of the present invention. The present embodiment is a combination of Embodiment 2 and Embodiment 4 described above, and includes a mobile receiving station 10 by a remote direction operation transmitting unit 12 and a receiving unit 11.
The control of the directional antenna 3 in the direction and the prediction control calculation unit 1
Both the correction of the direction of the directional antenna 3 and the direction of the directional antenna 3 enable the mobile receiving station 10 to emit the strong transmission radio wave 9 more accurately and more quickly by the directional antenna 3.

Embodiment 6 FIG. FIG. 6 shows a sixth embodiment of the present invention. The air-drop radio device 1 according to the present embodiment rotates when dropped by a propeller or a rotary wing 13, and has only a transmitter 4 and a directional antenna 3 mounted therein.

This is applied to the case where the radio wave reception at the receiving station only needs to be performed intermittently. The air-drop radio equipment 1 performs radio wave transmission while rotating while falling, and
This is received by a plurality of or a single receiving station every week. In this embodiment, strong intermittent radio wave transmission to a plurality of receiving stations is possible.

[0026]

As described above, according to the present invention, a directional antenna can be used, and even when the same transmitter is used, a stronger radio wave transmission to a receiving station can be performed as compared with the conventional one. Can be realized.

Also, since the direction of the directional antenna can be changed from the ground through a remote azimuth operation receiving unit mounted on the air-drop type electronic device, it is possible to reliably move toward the receiving station in response to movement of the receiving station. Radio transmission is possible.

In addition, by extracting from the geomagnetic sensor an output that follows the self-rotation of the air-drop type electronic device during its fall, radio transmission with high directivity is possible.

Further, by predicting the self-rotation of the aerial drop-type electronic device during the fall from the history of data acquired by the geomagnetic sensor, it is possible to transmit radio waves with a directional antenna having high directivity and high speed.

Also, strong radio waves can be transmitted intermittently to a plurality of receiving stations by using a directional antenna.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a radio wave transmission method according to Embodiment 1 of the present invention.

FIG. 2 is a conceptual diagram showing a radio wave transmission method according to Embodiment 2 of the present invention.

FIG. 3 is a conceptual diagram showing a radio wave transmission method according to Embodiment 3 of the present invention.

FIG. 4 is a conceptual diagram showing a radio wave transmission method according to Embodiment 4 of the present invention.

FIG. 5 is a conceptual diagram showing a radio wave transmission method according to Embodiment 5 of the present invention.

FIG. 6 is a conceptual diagram showing a radio wave transmission method according to Embodiment 6 of the present invention.

FIG. 7 is a conceptual diagram showing a conventional radio wave transmission method.

[Explanation of symbols]

1 air-drop radio equipment, 2 receiving station,
3 directional antennas, 4 transmitters,
5 motor, 6 antenna axis rotation controller, 7 geomagnetic sensor,
8 parachute, 9 transmitted radio wave,
REFERENCE SIGNS LIST 10 mobile receiving station, 11 remote directional operation receiving section including antenna, 12 remote directional operation transmitting section including antenna, 1
3 propeller or rotation stabilizing wing, 15 predictive control calculator, 16 predictive angle.

Claims (6)

[Claims] An air-drop radio device equipped with a directional antenna is dropped from a launch vehicle, an aircraft, or the like, and a radio wave is transmitted from the radio device during the fall, and the mobile device (car, aircraft, flying object, ship, etc.) Radio wave transmission method for receiving at a receiving station on the ground, etc., the airborne radio equipment is equipped with a geomagnetic sensor to acquire its own direction in the air, and the receiving station uses the direction of this geomagnetic sensor as its own reference. When directing the directional antenna in the direction, either the forward rotation or the reverse rotation of the directional antenna, the minimum operation angle toward the receiving station is calculated, and the rotation of the directional antenna axis is controlled according to the minimum operation angle. A radio wave transmission method characterized in that: 2. An airborne radio wave device is equipped with a remote direction operation receiving unit, and through this remote direction operation receiving unit, independently of antenna axis rotation control by a geomagnetic sensor, performs antenna axis rotation control at any time to control a directional antenna. 2. The radio wave transmission method according to claim 1, wherein the direction can be changed. 3. An antenna axis rotation control is performed in accordance with a change in output data of a geomagnetic sensor due to a self-rotation of a dropped air-drop radio device, and a directional antenna is directed to a receiving station. The radio wave transmission method according to claim 1 or 2, wherein: 4. The tendency of self-rotation of a falling airdrop type radio device during self-rotation (constant angular velocity, constant angular acceleration, Calculation and prediction of constant torsional vibration, torsional damping vibration, etc., which are likely to occur due to such factors as, etc., and control the antenna axis rotation based on this predicted value and the output of the geomagnetic sensor, and direct the directional antenna toward the receiving station. The radio wave transmission method according to claim 3, wherein: 5. A remote azimuth operation receiving unit, wherein the antenna directional rotation control can be performed at any time through the remote azimuth operation receiving unit, separately from the antenna axis rotation control by the geomagnetic sensor, so that the directional antenna direction can be changed. The radio wave transmission method according to claim 4, wherein: 6. An air-drop radio device equipped with a directional antenna is dropped from a launch vehicle, an aircraft, or the like, and a radio wave is transmitted from the radio device during the fall, and the mobile device (car, aircraft, flying object, ship) Radio wave transmission method for receiving at a receiving station on the ground, the above-mentioned air-drop radio equipment has a propeller or a rotation stabilizing wing, and a plurality of directional antennas of the electronic equipment are provided for each rotation of the air-drop electronic equipment. Alternatively, a radio wave transmission method characterized by transmitting radio waves to a single receiving station.