Method and system for testing Beidou earthquake early warning terminal by adopting Beidou signal

Abstract

The invention discloses a method and system for testing a Beidou earthquake early warning terminal by adopting a Beidou signal, and the method comprises the following steps: mapping early warning information codes into the fifth bit and the sixth bit of a satellite mask information telegraph text epoch moment, and circularly broadcasting the early warning information codes according to a preset sequence; or the early warning information codes are mapped into the second bit and the third bit of the clock error correction information telegraph text epoch moment, and the early warning information codes are broadcasted circularly according to a preset sequence; receiving and demodulating a Beidou B2B-PPP signal; analyzing the B2B-PPP message, and extracting an information category code and an epoch moment code; and according to the mapping rule, extracting the early warning information code, and mapping the early warning information code into simulation early warning information to complete the terminal test.

Description

Technical Field

[0001] This application relates to early warning technology, in particular to a method and system for testing a Beidou earthquake early warning terminal using Beidou signals Background Art

[0002] The present invention relates to the field of emergency disaster relief technology. An earthquake early warning information receiving terminal is a device that can issue an early warning signal within a few seconds to dozens of seconds before an earthquake occurs. It uses the principle that the propagation speed of electromagnetic waves is faster than that of seismic waves to reserve valuable time for emergency response. The earthquake early warning terminal based on Beidou satellites is an electronic terminal device that relies on the earthquake early warning information broadcast by Beidou navigation satellites for earthquake early warning

[0003] Testing of the Beidou earthquake early warning information receiving terminal requires testing the real-time performance and correctness of early warning information reception and processing, as well as testing the early warning reminder ability, the adaptability of the terminal to the actual signal environment, and the stability, reliability, and maintainability of the terminal. However, there are the following difficulties in testing the Beidou earthquake early warning information receiving terminal

[0004] a. The broadcast of Beidou earthquake early warning information is sudden, and real signals do not support the long-term working stability test conditions of the terminal

[0005] b. Using analog signals can test the long-term working stability of the product, but it cannot test the environmental adaptability of the terminal product, especially the EIRP of the transmitted signal, the influence of climate conditions during testing, and the influence of terrain and landform conditions during testing Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a method and system for testing a Beidou earthquake early warning terminal using Beidou signals

[0007] On the one hand, an embodiment of the present application provides a method for testing a Beidou earthquake early warning terminal using Beidou signals, including the following steps

[0008] Map the early warning information coding to the 5th and 6th bits of the epoch time of the satellite mask information telegram, and broadcast the early warning information coding in a cyclic order according to a preset order

[0009] Or

[0010] Map the early warning information coding to the 2nd and 3rd bits of the epoch time of the clock difference correction information telegram, and broadcast the early warning information coding in a cyclic order according to a preset order

[0011] Receive and demodulate the Beidou B2B-PPP signal

[0012] Analyze the B2B-PPP telegram, and extract the information category coding and epoch time coding

[0013] Extract the early warning information code according to the mapping rule, and map the early warning information code to the simulated early warning information to complete the terminal test.

[0014] In some embodiments, the early warning information code includes: 00, 11, 10, 01;

[0015] Each of the early warning information codes corresponds to one of the following meanings:

[0016] Being within the earthquake early warning reminder area, not being within the earthquake early warning area, being within the rescue reminder area, not being within the help reminder area.

[0017] In some embodiments, the early warning information codes are cyclically broadcast in a preset order, specifically:

[0018] Broadcast cyclically in the order of 00, 11, 10, 01.

[0019] In some embodiments, the completion of the terminal test includes:

[0020] Generate alarm information according to the simulated early warning information to verify the terminal function.

[0021] In some embodiments, the early warning information code is mapped to the 5th and 6th bits of the satellite mask information message epoch, and the information broadcast period is 48s.

[0022] In some embodiments, the early warning information code is mapped to the 2nd and 3rd bits of the clock error correction information message epoch, and the information broadcast period is 6s.

[0023] On the other hand, an embodiment of the present application discloses a system for testing a Beidou earthquake early warning terminal using Beidou signals, including:

[0024] A memory for storing programs;

[0025] A processor for loading the method.

[0026] On the other hand, an embodiment of the present application provides a system for testing a Beidou earthquake early warning terminal using Beidou signals, including:

[0027] An encoding module for

[0028] mapping the early warning information code to the 5th and 6th bits of the satellite mask information message epoch, and cyclically broadcasting the early warning information code in a preset order;

[0029] Or,

[0030] mapping the early warning information code to the 2nd and 3rd bits of the clock error correction information message epoch, and cyclically broadcasting the early warning information code in a preset order;

[0031] A receiving module, configured to receive and demodulate Beidou B2B-PPP signals;

[0032] An analysis module, configured to analyze B2B-PPP telegrams and extract information category codes and epoch time codes;

[0033] A mapping module, configured to extract warning information codes according to mapping rules and map the warning information codes into analog warning information to complete terminal testing.

[0034] Through the embodiments of the present application, testing is performed by receiving real signals transmitted by Beidou navigation satellites, effectively avoiding the problem of whether the analog signals are credible, and the testing environment is credible and effective. By adopting this testing scheme, product testing can be carried out in various topographical and geomorphic environments such as cities, villages, jungles, mountains, and plateaus, under various meteorological conditions such as wind, cloud, rain, and snow, and under various actual dynamic conditions such as static, walking, and high-speed movement, so as to fully test the environmental adaptability of the product. The signals transmitted by the satellites are valid all year round, and the analog information is sent at most once every 48 s, providing sufficient testing opportunities for testing and enabling full testing of the reliability of the product.

[0035] There is no need to build a dedicated testing environment or configure dedicated testing instruments, and the testing is convenient and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for the description of the embodiments will be briefly introduced below.

[0037] Figure 1 is a flowchart of a method provided by an embodiment of the present application;

[0038] Figure 2 is a schematic diagram of four kinds of analog warning information;

[0039] Figure 3 is the overall frame structure of B2B-PPP signal telegrams;

[0040] Figure 4 is the frame structure of satellite mask information;

[0041] Figure 5 is the frame structure of clock error correction information;

[0042] Figure 6 is a schematic diagram of the epoch time code of B2B-PPP signal telegrams. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following will refer to the accompanying drawings in the embodiments of this application and clearly and completely describe the technical solutions of this application through implementation manners. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0044] In the following description, reference is made to "some embodiments", which describe subsets of all possible embodiments. However, it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0046] Related technologies: (1) Basic principle of earthquake early warning:

[0047] When an earthquake occurs, two main types of seismic waves will be generated: the primary wave (P wave) and the secondary wave (S wave). The primary wave propagates faster but has less destructive power; the secondary wave propagates slower but carries a large amount of energy and is the main factor causing earthquake damage. The earthquake early warning system utilizes the difference in the propagation speeds of these two waves and the fact that the propagation speed of electromagnetic waves is faster than that of seismic waves to achieve the early warning function.

[0048] Primary wave (P wave): The propagation speed is about 6 kilometers per second. It is the fastest mechanical wave among seismic waves but has less destructive power.

[0049] Secondary wave (S wave): It is also a mechanical wave. The propagation speed is about 3.5 kilometers per second. It is slower but carries a large amount of energy and is the main factor causing earthquake damage.

[0050] The propagation speed of electromagnetic waves is 300,000 kilometers per second, which is much faster than the propagation speeds of earthquake primary waves and secondary waves.

[0051] The earthquake early warning system receives the primary wave, quickly locates the earthquake time, earthquake center, and earthquake intensity, and uses the principle that the propagation speed of electromagnetic waves is much greater than that of seismic waves to broadcast the early warning information to the affected areas through the Beidou satellite via electromagnetic waves, providing several seconds to dozens of seconds of emergency evacuation time for these areas.

[0052] (2) Technical implementation of earthquake early warning:

[0053] Earthquake early warning is completed through the cooperation of earthquake monitoring network monitoring, earthquake data processing, early warning information release, and early warning information reception and warning.

[0054] Earthquake monitoring network monitoring: Relying on a high-density earthquake monitoring network, it monitors earthquake activities in real time.

[0055] Earthquake data processing: When an earthquake occurs, the monitoring stations near the earthquake source detect the P wave and immediately start calculating parameters such as the magnitude and location of the earthquake source.

[0056] Early warning information release: Once the earthquake parameters are calculated, the system will send early warning information to the affected areas through the Beidou satellite navigation system.

[0057] Early warning information reception and warning: The earthquake early warning information reception terminal based on Beidou receives the earthquake early warning information broadcast by Beidou navigation satellites, processes it to form early warning reminder information, and reminds the affected people to take shelter.

[0058] Refer to Figure 1 and Figure 2 , the embodiment of the present application provides a test method, and the technical solution of the present invention mainly includes the following key components:

[0059] Step 1. Design early warning information codes. It can be understood that this step is a preparation step. In this step, a limited number of information bits are used to express four early warning information codes.

[0060] Considering two applications of impending earthquake early warning reminder and post-earthquake help, and including two actual situations of being inside and outside the reminder area in each case, four early warning information codes are designed, namely 00, 11, 10, and 01.

[0061] Step 2. Establish the correspondence between early warning information codes and simulated early warning information, refer to Figure 2 .

[0062] Map the early warning information codes to specific application examples, including:

[0063] A1. Map 00 to "being inside the earthquake early warning reminder area"; as Figure 2 described in unit A1 of , the user is located inside the circle, and at this time the inside of the circle is within the earthquake early warning range.

[0064] A2. Map 11 to "not being within the earthquake early warning area"; as Figure 2 described in unit A2 of , the user is located outside the circle, and at this time the inside of the circle is within the earthquake early warning range.

[0065] B1. Map 10 to "being inside the rescue reminder area"; as Figure 2As described in Unit B1, the user is located within the circle, and at this time, the area within the circle is within the post-earthquake rescue warning range.

[0066] B2. Map 01 to "not within the help reminder area". For example, Figure 2 As described in Unit B2, the user is located outside the circle, and at this time, the area within the circle is within the post-earthquake rescue warning range.

[0067] Step 3. Establish the mapping relationship between the warning information code and the satellite launch information.

[0068] Map the warning information code to the time coding sub-bit of the B2B-PPP information of the Beidou navigation satellite.

[0069] The B2B-PPP signal message contains various information types, such as satellite mask information, orbit correction, clock error correction, etc. Among them, the satellite mask information broadcast period is 48s, and the clock error correction information broadcast period is 6s.

[0070] The epoch time of the B2B-PPP signal message is an unsigned binary integer, with a total of 17 bits.

[0071] From Figures 3 - 6 it can be seen that there are two optional schemes for mapping the warning information code to the time coding sub-bit of the B2B-PPP information of the Beidou navigation satellite.

[0072] Scheme 1: Map the warning information code to the 5th and 6th bits of the epoch time of the satellite mask information message. The information broadcast period is 48s, and it is broadcast in a cycle in the order of 00, 11, 10, 01.

[0073] Scheme 1: Map the warning information code to the 2nd and 3rd bits of the epoch time of the clock error correction information message. The information broadcast period is 6s, and it is broadcast in a cycle in the order of 00, 11, 10, 01.

[0074] Step 4. Receive and map the warning information for processing.

[0075] The main steps of receiving and mapping the warning information for processing are as follows:

[0076] a. Receive and demodulate the Beidou B2B-PPP signal; this step is performed by the terminal device to be tested for reception.

[0077] b. Analyze the B2B-PPP message and extract the information category code and the epoch time code. It can be understood that through the information category code, the type of the B2B-PPP signal at this time can be determined, so as to determine which bit of the epoch time code to extract the information from.

[0078] c. According to the mapping rule, extract the early warning information code and map the early warning information code to the simulated early warning information. At this time, in this step, the early warning information code can be extracted, and then the corresponding simulated early warning information, that is, the specific alarm type, can be converted.

[0079] d. Complete the processing of the early warning information, and issue early warning reminders, rescue reminders, etc. according to the early warning conditions.

[0080] Step 5. Test using the actual Beidou satellite signal.

[0081] After completing Steps 1-4, the early warning information receiving terminal can be tested using the actual Beidou B2B-PPP signal. It can be understood that through the above solution, the Beidou WeChat signal can be used for testing in the long term.

[0082] The embodiment of the present application discloses a system for testing a Beidou earthquake early warning terminal using Beidou signals, including:

[0083] A memory for storing programs;

[0084] A processor for loading the method.

[0085] The embodiment of the present application provides a system for testing a Beidou earthquake early warning terminal using Beidou signals, including:

[0086] An encoding module for

[0087] Mapping the early warning information code to the 5th and 6th bits of the epoch moment of the satellite mask information message and cyclically broadcasting the early warning information code in a preset order;

[0088] Or,

[0089] Mapping the early warning information code to the 2nd and 3rd bits of the epoch moment of the clock error correction information message and cyclically broadcasting the early warning information code in a preset order;

[0090] A receiving module for receiving and demodulating the Beidou B2B-PPP signal;

[0091] An analysis module for analyzing the B2B-PPP message and extracting the information category code and the epoch moment code;

[0092] A mapping module for extracting the early warning information code according to the mapping rule and mapping the early warning information code to the simulated early warning information to complete the terminal test.

[0093] Compared with the prior art, the present invention has the following several significant beneficial effects:

[0094] 1. The real satellite transmission signal

[0095] By receiving the real signals transmitted by Beidou navigation satellites for testing, the problem of whether the simulated signals are credible is effectively avoided, and the test environment is credible and effective.

[0096] 2. Conduct real tests on the environmental adaptability of terminal products

[0097] Adopting this test scheme, product tests can be carried out in various topographical and environmental conditions such as cities, villages, jungles, mountains, and plateaus, under various meteorological conditions such as wind, cloud, rain, and snow, and under various actual dynamic conditions such as static, walking, and high-speed movement, which can fully test the environmental adaptability of the product.

[0098] 3. Sufficient test time

[0099] The signals transmitted by the satellites are valid throughout the year, and the simulated information is sent at most once every 48s, providing sufficient test time for testing and enabling full testing of the reliability of the product.

[0100] 4. Low test cost

[0101] There is no need to build a dedicated test environment or configure dedicated test instruments. The test is convenient and the cost is low.

[0102] Note that the above are only the preferred embodiments of the present application and the applied technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments. Without departing from the concept of the present application, more other equivalent embodiments can be included, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A method for testing a Beidou earthquake early warning terminal using Beidou signals, characterized in that: The following steps are involved: Map the warning information code to the 5th and 6th bits of the satellite mask information message epoch time, and broadcast the warning information code cyclically in a preset order; or, Map the warning information code to the second and third digits of the epoch time of the clock correction information message, and broadcast the warning information code cyclically in a preset order; Receive and demodulate Beidou B2B-PPP signals; Parse B2B-PPP messages and extract information category codes and epoch time codes; According to the mapping rules, the warning information code is extracted and mapped to the simulated warning information to complete the terminal test.

2. The method for testing a Beidou earthquake early warning terminal using Beidou signals according to claim 1, characterized in that: The warning information codes include: 00, 11, 10, 01; Each of the warning information codes corresponds to one of the following meanings: In the earthquake warning area, not in the earthquake warning area, in the rescue reminder area, not in the help reminder area.

3. The method for testing a Beidou earthquake early warning terminal using Beidou signals according to claim 1, characterized in that: The warning information codes are broadcast cyclically in a preset order, specifically: The numbers are broadcast in the order of 00, 11, 10, and 01.

4. The method for testing a Beidou earthquake early warning terminal using Beidou signals according to claim 1, characterized in that: The terminal test is completed, including: Generate alarm information based on simulated warning information to verify terminal functions.

5. The method for testing a Beidou earthquake early warning terminal using Beidou signals according to claim 1, characterized in that: The warning information code is mapped to the 5th and 6th bits of the satellite mask information message epoch time, and the information broadcasting cycle is 48s.

6. The method for testing a Beidou earthquake early warning terminal using Beidou signals according to claim 1, characterized in that: The warning information code is mapped to the second and third digits of the epoch time of the clock correction information telegram, and the information broadcasting cycle is 6s.

7. A system for testing Beidou earthquake early warning terminals using Beidou signals, characterized in that: include: Memory, used to store programs; A processor, configured to load the method according to any one of claims 1 to 6.

8. A system for testing Beidou earthquake early warning terminals using Beidou signals, characterized in that: include: Encoding module for Map the warning information code to the 5th and 6th bits of the satellite mask information message epoch time, and broadcast the warning information code cyclically in a preset order; or, Map the warning information code to the second and third digits of the epoch time of the clock correction information message, and broadcast the warning information code cyclically in a preset order; Receiving module, used to receive and demodulate Beidou B2B-PPP signals; Parsing module, used to parse B2B-PPP messages and extract information category codes and epoch time codes; The mapping module is used to extract the warning information code according to the mapping rules, and map the warning information code into simulated warning information to complete the terminal test.

9. A system according to claim 8, characterized in that: The warning information codes include: 00, 11, 10, 01; Each of the warning information codes corresponds to one of the following meanings: In the earthquake warning area, not in the earthquake warning area, in the rescue reminder area, not in the help reminder area.

10. The method for testing Beidou earthquake early warning terminal using Beidou signal according to claim 8, characterized in that: The warning information codes are broadcast cyclically in a preset order, specifically: The numbers are broadcast in the order of 00, 11, 10, and 01.

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