CN102572685B - Mobile phone detection method for post-disaster search and rescue and proprietary mobile phone - Google Patents

Abstract

The invention discloses a post-disaster search and rescue mobile phone detection method, which belongs to the technical field of post-disaster search and rescue life detection. The method includes: locating surface mobile phones; selecting several proprietary mobile phones from the surface mobile phones, and opening the repeater function of the proprietary mobile phones; base stations transmit control signals, and the proprietary mobile phones forward the control signals; The mobile phone receiving the control signal initiates registration access and sends a registration access signal; the proprietary mobile phone forwards the registration access signal; the base station receives the registration access signal to complete registration. The invention also provides a proprietary mobile phone. Through the opening of the function of the proprietary mobile phone repeater, the present invention performs the detection registration and positioning of the deep mobile phone in a relay manner, and finally completes the registration search and rescue work for all terminals, which can effectively avoid the problem caused by the maximum transmission power of the base station and the mobile phone and the reception of the antenna. Sensitivity limitation affects the positioning of mobile phones, thereby improving the efficiency of mobile phone positioning and the detection efficiency of post-disaster collection.

Description

A post-disaster search and rescue mobile phone detection method and proprietary mobile phone

technical field

The invention relates to the technical field of post-disaster search and rescue life detection technology, in particular to a post-disaster search and rescue mobile phone detection method and a proprietary mobile phone.

Background technique

Natural disasters have the characteristics of instantaneous occurrence, severe damage, difficulty in monitoring and forecasting, and far-reaching social impact. For example, destructive earthquakes, landslides and other disasters have caused huge harm and losses to national economic construction and people's life and property safety. Numerous cases of natural disasters at home and abroad prove that the technical level of post-disaster emergency rescue is extremely important for reducing disaster losses.

At present, our country is still very weak in disaster emergency rescue technology, mainly relying on manpower, search and rescue dogs and life detectors for life detection to find survivors. The detection efficiency of manpower and search and rescue dogs is relatively low, and is seriously affected by the surrounding environment. Existing life detectors have shortcomings such as being greatly affected by the site environment, small search space, slow search speed, and lack of fast positioning capabilities, which are far from meeting the needs of large-scale and rapid search and rescue of trapped people buried in ruins after disasters.

In order to solve the problem that the life detector in the prior art is seriously affected by the environment, resulting in low search and rescue efficiency, a post-disaster life detection method and system based on mobile phones is proposed. As shown in Figure 1, this system consists of mobile phones (mobile terminals) and several life detectors (base stations). After a disaster occurs, the life detector (base station) sends a message to induce the mobile phone (mobile terminal) of the trapped person to register and access, and searches for the signal sent by the life detector to establish an emergency link. According to the distress signal, the life detector determines the mobile terminal and performs positioning operation, and finally determines the position of the trapped person for effective rescue.

In the process of realizing the present invention, the inventors found that the existing technology has at least the following problems: the existing post-disaster life detection and positioning system based on induced mobile phone registration, due to the limitations of the maximum transmission power of mobile phones and base stations and the receiving sensitivity of antennas, and post-disaster In the ruins environment, the signal attenuation is serious, and the wireless environment is complex, which makes it difficult to detect buried mobile phones buried deep in the ruins, which seriously affects the development of search and rescue work.

Contents of the invention

In order to solve the problem in the prior art that the limitation of the maximum transmission power of the base station and the mobile phone and the receiving sensitivity of the antenna affect the positioning and detection of the deeply buried mobile phone, the embodiment of the present invention provides a post-disaster search and rescue mobile phone detection method and a proprietary mobile phone. Described technical scheme is as follows:

A post-disaster search and rescue mobile phone detection method, the method comprising:

Locate the surface mobile phone;

Select several proprietary mobile phones from the surface cell phones, and open the repeater function of the proprietary mobile phones;

The base station transmits a control signal, and the proprietary mobile phone forwards the control signal;

The mobile phone receiving the control signal initiates registration access and sends a registration access signal;

The proprietary mobile phone forwards the registration access signal;

The base station receives the registration access signal to complete registration.

The base station receiving the registration access signal includes:

The base station receives registration access signals sent by the same mobile phone forwarded by different proprietary mobile phones, records the arrival time of these registration access signals, and obtains the location of the mobile phone in combination with the location of the proprietary mobile phone result.

The obtaining the positioning result of the mobile phone includes:

The time when the registration access signal sent by the mobile phone arrives at the base station after being forwarded by the proprietary mobile phone Wherein, t is the time when the mobile phone sends the registration access signal, t _j is the time when the base station receives the registration access signal, j=1, 2, 3, 4...;

Set the coordinates of the proprietary mobile phone E _j as (X _j , Y _j , Z _j ) respectively, and the coordinates of the mobile phone as (x, y, z), select at least 4 relevant data of the proprietary mobile phone E _j , and calculate the equation Group

Obtain the coordinates of the mobile phone; wherein, the D _j is the distance between the proprietary mobile phone E _j and the base station.

When the proprietary mobile phone forwards the registration access signal, it carries its own information; or

The repeater functions of the proprietary mobile phones are turned off one by one, so as to determine the proprietary mobile phones corresponding to the registration access signals received by the base station.

Said selecting several proprietary mobile phones from said surface mobile phones, and opening the repeater function of said proprietary mobile phones, including:

Randomly select several proprietary mobile phones from the surface mobile phones that have been positioned;

The base station sends a repeater control signal to control the selected proprietary mobile phone to turn on the repeater function.

The repeater function of the proprietary mobile phone also includes:

amplifying the control signal transmitted by the base station and the registration access signal initiated by the mobile phone.

A proprietary mobile phone has the communication function of the existing mobile phone. The proprietary mobile phone also includes a repeater unit for receiving and forwarding the control signal transmitted by the base station and the registration access signal transmitted by the mobile phone.

The repeater unit is also used to amplify the control signal transmitted by the base station and the registration access signal transmitted by the mobile phone.

The proprietary mobile phone also includes a control unit, which is used to receive the repeater control signal sent by the base station, and control the opening and closing of the repeater unit.

The proprietary mobile phone also includes an information unit for storing its own information;

The repeater unit is also used to obtain and send the information of the proprietary mobile phone from the information unit when forwarding the registration access signal sent by the mobile phone.

The beneficial effects brought by the technical solution provided by the embodiments of the present invention are:

In the embodiments of the present invention, the buried terminal is layered by using the attenuation of the terminal's forward link, and the surface mobile phone is located using the traditional positioning method based on induced mobile phone registration. After completing the positioning of all mobile phones on the surface layer, select several proprietary mobile phones that have completed positioning and turn on their repeater functions, amplify the received base station control information and send it to deeper mobile phones. After the deep mobile phone receives the base station control information amplified from the downlink of the proprietary mobile phone, it sends a registration access message, which is amplified by the proprietary mobile phone and sent to the base station for positioning the deep mobile phone. In this way, the repeater function of the proprietary mobile phone is used to complete the relay communication to the deep mobile phone, and finally the positioning algorithm can be used to complete the positioning of all mobile phones. The solution provided by the embodiment of the present invention can effectively avoid the influence on the positioning of the mobile phone due to the limitation of the maximum transmission power of the base station and the mobile phone and the receiving sensitivity of the antenna, thereby improving the positioning efficiency of the mobile phone and the detection efficiency of post-disaster collection.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic diagram of a mobile phone-based post-disaster life detection system in the prior art;

Fig. 2 is a schematic diagram of the working principle of an embodiment of the present invention;

Fig. 3 is a schematic flow chart of the post-disaster search and rescue mobile phone detection method provided by Embodiment 1 of the present invention;

Fig. 4 is a schematic diagram of a method for locating a private mobile phone and a registration access signal relationship provided by Embodiment 2 of the present invention;

Fig. 5 is a schematic structural diagram of a proprietary mobile phone provided by Embodiment 4 of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

When natural disasters such as earthquakes occur, a large number of people will be trapped or buried in the ruins of large building collapses, and the distribution of mobile phones of these buried people is uncertain and uneven. For example, some mobile phones are buried on the surface of the ruins and can easily get in touch with the base station, while some mobile phones are buried in the deep layer of the ruins. Due to the attenuation of wireless signals by the ruins themselves, the mobile phones buried in the deep layer cannot communicate with life. The detected base station gets in touch, so it is impossible to know the location, quantity and other information of the deep mobile phone. In the post-disaster life detection and positioning system based on induced registration and access of mobile phone terminals, the mobile terminal to be located will be induced to initiate registration and access only when the strength of the received forward link signal meets the correct decoding requirements. Therefore, the principle of the control method in the embodiment of the present invention is that the base station uses the traditional positioning method based on inducing mobile phone registration to complete the positioning of the surface mobile phone without activating the repeater function of the proprietary mobile phone (the proprietary mobile phone must have a controllable The wireless repeater function), the so-called surface layer refers to the communication between the base station and the mobile phone will not fail due to link attenuation. After completing the positioning of all mobile phones on the surface (that is, the mobile phone receives the registration completion message from the base station), select several proprietary mobile phones that have completed positioning and turn on their repeater functions, and transmit the received base station in the pilot channel , Sync Channel and Broadcast Channel messages are amplified and sent to deeper mobile phones. After the deep mobile phone receives the base station message amplified from the downlink of the proprietary mobile phone, it sends a registration request message, which is amplified uplink by the proprietary mobile phone and sent to the base station for positioning the deep mobile phone. In this way, the repeater function of the proprietary mobile phone is used to complete the relay communication to the deep mobile phone, and finally the positioning algorithm can be used to complete the positioning of all mobile phones. The specific work diagram is shown in Figure 2, where the light-colored ones are ordinary mobile phones, and the dark-colored ones are proprietary mobile phones.

The embodiment of the present invention is based on a mobile phone-based post-disaster life detection method and system. The detection base station in the embodiment of the present invention can be a life detector in the mobile phone-based life detection method, or other signals with corresponding functions. generating device.

Example 1

The post-disaster search and rescue mobile phone detection method provided by Embodiment 1 of the present invention is specifically shown in Figure 3, including the following steps:

Step 10, locate the surface cell phone.

Here, we assume that the proprietary mobile phone and the ordinary mobile phone are buried in the ruins after the disaster. The surface mobile phone includes proprietary mobile phones and ordinary mobile phones. Surface mobile phones refer to mobile phones that have a line-of-sight link with the positioning base station or can be accurately positioned by ordinary positioning algorithms. These mobile phones are usually located on the surface of post-disaster ruins, so they are called surface mobile phones. Correspondingly, mobile phones that are buried deep in the ruins or cannot directly contact the search and rescue base station due to the loss of various wireless environments become deep mobile phones.

The specific positioning algorithm can refer to the following process: set the undetermined coordinates of the search and rescue terminal to be (X, Y, Z), and the coordinates of the k life detectors are respectively The relative clock deviation between the life detector and the terminal is c is the propagation speed of radio waves, t _i is the arrival delay of the registration signal measured by each life detector at the same time of the mobile phone, then

Based on this, the buried position of the three-dimensional information of the terminal can be calculated.

Step 20, select several proprietary mobile phones from the completed surface layer mobile phones, and start the repeater function of the proprietary mobile phones.

The proprietary mobile phone here is a proprietary mobile phone with a repeater function. In addition to the communication function of a general mobile phone, it also has the function of a repeater. The repeater function can be turned on or off by transmitting the corresponding repeater control signal from the base station.

The function of the repeater here is similar to the repeater used in the general communication system. It is mainly used to receive and forward the control signals transmitted by the base station and the registration and access signals initiated by the mobile phone, and also to amplify these signals. That is to say, under normal circumstances, the repeater will receive the control signal transmitted by the base station and the registration access signal initiated by the mobile phone, amplify it and then forward it.

For the positioning of surface mobile phones, it naturally includes all ordinary mobile phones and proprietary mobile phones on the surface, and a certain number of these proprietary mobile phones must be guaranteed. From the surface mobile phones that have been positioned, some proprietary mobile phones are randomly selected, and their repeater functions are turned on. Generally, for the needs of the subsequent positioning algorithm, it is usually necessary to select 4 proprietary mobile phones and enable their repeater functions.

Step 30, the base station transmits a control signal, and the dedicated mobile phone forwards the control signal.

Here, in order to complete the positioning, the base station needs to transmit a control signal to control the mobile phone receiving the signal to initiate access registration. The control signal here is actually an inducing signal, similar to the information sent by the existing common base station on the pilot channel, synchronization channel and broadcast channel. The main purpose is to make the mobile phone that receives the signal initiate the process of registration and access. After receiving the control signal, the proprietary mobile phone with the repeater function amplified and forwarded the control signal.

Step 40, the mobile phone receiving the control signal initiates registration and access, and sends a registration and access signal.

Here, because the mobile phone on the surface has completed the positioning, it will no longer respond to the control signal, and only the mobile phone that receives the control signal for the first time will initiate registration and access. Generally, the control signal transmitted through the proprietary mobile phone is received. These mobile phones will initiate registration access after receiving the control signal.

Step 50, the private mobile phone forwards the registration access signal of the common mobile phone.

For the registration access initiated by the mobile phone, the signal cannot be sent directly to the base station, so a dedicated mobile phone is required to forward it again, and the forwarded registration access signal can be received by the base station

Step 60, the base station receives the registration access signal and completes the registration.

Here, after receiving the registration access signal, the base station registers the corresponding mobile phone.

In this embodiment, by turning on the repeater function of the proprietary mobile phone, the control signal transmitted by the base station is forwarded, so that the deep mobile phone that cannot receive the control signal of the base station can also receive the forwarded control signal. Then, the signal for registering and accessing the mobile phone is forwarded through the repeater function of the proprietary mobile phone so that the base station can receive it. In this way, the positioning of the deep mobile phone can be completed through the relay of the proprietary mobile phone.

Example 2

In the solution provided by Embodiment 2 of the present invention, after the control signal transmitted by the base station is forwarded by the dedicated mobile phone repeater function, the received mobile phone initiates registration and access. The signal for registration and access also needs to be forwarded by the proprietary mobile phone repeater function. The registration access signal received by the base station and sent by the same mobile phone forwarded by different proprietary mobile phones must be combined with the arrival time of these registration access signals and the location of the corresponding proprietary mobile phone to calculate the detailed positioning of the mobile phone result.

Generally, in order to distinguish the difference between the registration and access signals forwarded by different proprietary mobile phones, it is possible to add its own information after the proprietary mobile phone forwards the registration and access signals, so that the base station receiving the signal can pass the information of the proprietary mobile phone To distinguish the signals forwarded by different proprietary mobile phones, and combine the position of the proprietary mobile phone to locate the specific location of the mobile phone.

In particular, the base station receives the registration access information of a deep mobile phone, which is relayed from different proprietary mobile phones and then transmitted to each base station. Since the received information is the same, the base station cannot distinguish which proprietary mobile phone it corresponds to. followed, and therefore cannot be located. This requires turning off the repeater functions of proprietary mobile phones one by one, so as to correspond to the relationship between proprietary mobile phones and registered access signals one by one.

The specific method includes: selecting 4 of the proprietary mobile phones that have completed the positioning and turning on the repeater function, amplifying the downlink signal of the base station and sending it to the deep mobile phone to induce the deep mobile phone to initiate registration and access. After that, the uplink registration access signal sent by the deep mobile phone is amplified and sent to the base station, and the base station counts the arrival time and strength of the first registration message. (Here, it is assumed that the selected four proprietary mobile phones can ensure that the delay extensions for receiving the registration access information do not overlap). Before the mobile phone sends the next registration access message, the base station turns off the repeater function of one of the proprietary mobile phones, and the base station counts the arrival time and intensity of the registration message. Repeat the above steps until the remaining proprietary mobile phone has the function of repeater. At this point, the proprietary mobile phone corresponding to the registration access signal of 4 time domain extensions can be obtained, that is, the registration access signal received and forwarded One-to-one correspondence is completed for proprietary mobile phones, and then the positioning of deep mobile phones can be completed. The specific schematic diagram is shown in Figure 4.

Example 3

In Embodiment 3 of the present invention, it is necessary to locate the specific location of the mobile phone. Usually, a time difference of arrival (Time Difference Of Arrival, TDOA) positioning method, also known as hyperbolic positioning, is a passive positioning method. By measuring the time difference between the arrival of radio signals at the antenna units of different monitoring systems, the transmitting radio The source of the signal is located. The basic principle of TDOA includes: measuring the time difference of the same signal arriving at different receivers, determining a hyperbolic trajectory according to the time difference, and finding the intersection point of multiple hyperbolic trajectories can realize the positioning of the target point.

The specific positioning algorithm for mobile phones is as follows:

Let the time when the first registration access message is sent by the mobile phone at the deep layer be t. The time when a base station B receives the first registration access message amplified by the proprietary mobile phone E _j is t _j , and then the time when the first registration access message arrives at the base station through E _j is

Suppose the distance between the proprietary mobile phone E _j and the base station B is D _j , then the distance between the deep mobile phone and the proprietary mobile phone

Suppose the coordinates of the proprietary mobile phone E _j are (X _j , Y _j , Z _j ), and the coordinates of the deep mobile phone are (x, y, z), then there is

The equations can be obtained by calculating the distance difference between the deep cell phone and the proprietary cell phone E _j respectively:

Solve it to get the deep cell phone coordinates (x, y, z).

Through this algorithm, the coordinate position of the specific deep mobile phone can be calculated, and the positioning of the deep mobile phone is completed.

Example 4

As shown in Fig. 5, embodiment 4 of the present invention provides a kind of proprietary mobile phone, on the basis of having the communication function of existing mobile phone, also includes repeater unit 100, is used for receiving and forwarding the control signal that base station transmits and mobile phone The registration access signal sent.

Here, the proprietary mobile phone first has the communication function of any mobile phone in the prior art, which can be a 2G GSM mobile phone or a CDMA mobile phone, or a 3G CDMA2000 mobile phone, a WCDMA mobile phone or a TD-SCDMA mobile phone, or various The corresponding mobile phone after upgrading the communication system of this standard.

Specifically, the proprietary functions of the proprietary mobile phone are mainly reflected in the process of being used for post-disaster life detection. In order to adapt to this special application, the proprietary mobile phone needs to have a repeater unit 100 to realize the same function as the existing repeater Similar to the signal receiving and forwarding function, here it is mainly used to realize the receiving and forwarding of the control signal transmitted by the base station and the registration access signal transmitted by the mobile phone.

In particular, for the repeater unit 100, it also has the function of amplifying the received signal and forwarding it, which mainly includes amplifying the received control signal transmitted by the base station and then forwarding it. The incoming signal is similarly amplified and then forwarded.

In particular, the above-mentioned proprietary mobile phone further includes a control unit 200 for receiving a repeater control signal sent by the base station, and controlling the opening and closing of the repeater unit 100 .

In particular, the above-mentioned proprietary mobile phone also includes an information unit 300 for storing its own information;

The repeater unit 100 is also used to obtain and transmit the self-information of the proprietary mobile phone from the information unit 300 when forwarding the registration access signal sent by the mobile phone.

The proprietary mobile phone in this embodiment is mainly used in the application scenarios of the above-mentioned several embodiments. Certainly, in other application scenarios, as long as a dedicated mobile phone is required to forward and amplify signals, the proprietary mobile phone provided in this embodiment can be applied.

To sum up, the embodiment of the present invention uses the attenuation of the forward link of the terminal to perform layered processing on the buried terminal, and uses the traditional positioning method based on induced mobile phone registration to complete the positioning of the surface mobile phone. After completing the positioning of all mobile phones on the surface layer, select several proprietary mobile phones that have completed positioning and turn on their repeater functions, amplify the received base station control information and send it to deeper mobile phones. After the deep mobile phone receives the base station control information amplified from the downlink of the proprietary mobile phone, it sends a registration access message, which is amplified by the proprietary mobile phone and sent to the base station for positioning the deep mobile phone. In this way, the repeater function of the proprietary mobile phone is used to complete the relay communication to the deep mobile phone, and finally the positioning algorithm can be used to complete the positioning of all mobile phones.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above embodiments can be completed by hardware, and can also be completed by instructing related hardware through a program. The program can be stored in a computer-readable storage medium. The above-mentioned The storage medium mentioned may be a read-only memory, a magnetic disk or an optical disk, and the like.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (5)

1. A post-disaster search and rescue mobile phone detection method, characterized in that the method comprises: Locate the surface mobile phone; Select several proprietary mobile phones from the surface cell phones, and open the repeater function of the proprietary mobile phones; The base station transmits a control signal, and the proprietary mobile phone forwards the control signal; The mobile phone receiving the control signal initiates registration access and sends a registration access signal; The proprietary mobile phone forwards the registration access signal; The base station receives the registration access signal to complete registration. 2. The method according to claim 1, wherein the receiving the registration access signal by the base station comprises: The base station receives registration access signals sent by the same mobile phone forwarded by different proprietary mobile phones, records the arrival time of these registration access signals, and obtains the location of the mobile phone in combination with the location of the proprietary mobile phone result. 3. The method according to claim 2, wherein when the proprietary mobile phone forwards the registration access signal, it carries its own information; or The repeater functions of the proprietary mobile phones are turned off one by one, so as to determine the proprietary mobile phones corresponding to the registration access signals received by the base station. 4. The method according to claim 1, characterized in that, selecting a plurality of proprietary mobile phones from the surface cell phones and opening the repeater function of the proprietary mobile phones includes: Randomly select several proprietary mobile phones from the surface mobile phones that have been positioned; The base station sends a repeater control signal to control the selected proprietary mobile phone to turn on the repeater function. 5. the method as claimed in claim 1 or 4, is characterized in that, the repeater function of described proprietary mobile phone also comprises: amplifying the control signal transmitted by the base station and the registration access signal initiated by the mobile phone.