Satellite receiving terminal-oriented darkroom and outdoor environment collaborative test system and method

Abstract

The invention relates to the field of satellite navigation, and discloses a satellite receiving terminal-oriented babysbreath microwave anechoic chamber and outdoor environment collaborative test system and method, and the system comprises a babysbreath microwave anechoic chamber, an unmanned plane platform, and a standard satellite positioning terminal disposed in the babysbreath microwave anechoic chamber. The tested satellite receiving terminal and the carrier are arranged in an outdoor environment, the upper computer is arranged outside the babysbreath microwave darkroom, and the satellite navigation signal simulation source and the GNSS time service module are arranged in the babysbreath microwave darkroom and on the unmanned aerial vehicle platform. According to a parameter instruction issued by the upper computer, the satellite navigation signal simulation sources of the babysbreath microwave anechoic chamber and the unmanned aerial vehicle platform generate satellite navigation signals used for testing a satellite receiving terminal, and the satellite navigation signals are broadcasted through respective navigation antennas. According to the invention, an indoor and outdoor collaborative test environment is effectively constructed, the test requirements of large equipment under the condition of no large darkroom are met, and the comprehensiveness and scientific rationality of test results are ensured.

Description

Technical Field

[0001] The invention belongs to the field of satellite navigation, and in particular to a darkroom and outdoor environment collaborative testing system and method for satellite receiving terminals. Background Art

[0002] In recent years, with the vigorous development of the satellite navigation industry, various types of satellite receiving terminals have emerged. During the development process of satellite navigation equipment, it is necessary to conduct performance tests and evaluations in a simulated environment based on its characteristics. Therefore, designing and building a simulated test environment has become an important research content.

[0003] At present, the simulation test environment for satellite receiving terminals is mostly a microwave darkroom environment, which mainly uses satellite simulation signal sources to generate satellite signals for testing satellite receiving terminals, and conducts separate tests on satellite receiving equipment on large equipment. Since the construction of darkrooms to accommodate large equipment occupies a large area and has high construction costs, if it is necessary to conduct simulated satellite reception tests on large equipment as a whole, there is often a lack of test conditions. Especially now that there are many types of equipment, with different shapes and styles, and diverse testing requirements, it is impossible to complete all performance tests indoors. Therefore, it is urgent to design a collaborative testing method for darkrooms and outdoor environments that is both effective and adaptable. Summary of the invention

[0004] In view of the lack of existing test conditions, the present invention designs a darkroom and outdoor environment collaborative testing system and method for satellite receiving terminals. By controlling the test parameters through the host computer, a darkroom and outdoor collaborative testing system is constructed by combining the starry sky microwave darkroom and several unmanned aerial vehicle platforms equipped with satellite navigation simulation signal sources and GNSS timing modules.

[0005] The technical solution of the present invention is as follows: The following technical solutions are specifically adopted:

[0006] A darkroom and outdoor environment collaborative testing system for satellite receiving terminals, a starry sky microwave darkroom and outdoor environment collaborative testing system for satellite receiving terminals, comprising:

[0007] The starry sky microwave darkroom is used to build a simulated test environment for satellite signal reception in the darkroom, providing satellite signals for standard satellite positioning terminals;

[0008] The drone platform is placed outside the Sky-filled Microwave Darkroom to simulate the positions of different satellites;

[0009] The standard satellite positioning terminal is placed in the star-filled microwave darkroom to receive the signals broadcast by the navigation antenna in the microwave darkroom and the signals input by the outdoor satellite receiving terminal, and return the data results to the host computer;

[0010] The satellite receiving terminal and carrier under test are placed outside the Mantianxing microwave darkroom to receive signals broadcast by different UAV platforms and transmit the signals generated by the satellite receiving terminal under test to the microwave darkroom;

[0011] The host computer is placed outside the Sky-Star microwave darkroom and is used to control the UAV platform and the synchronous single-star satellite navigation signal generated by the satellite navigation signal source, and realize the uniform motion control of the position and movement direction of the UAV platform;

[0012] The satellite navigation signal simulation source is placed in the Mantianxing microwave darkroom and on the UAV platform to generate simulated satellite signals and use the time information of the GNSS timing module to synchronize the broadcast with the simulated satellite signals in the Mantianxing microwave darkroom;

[0013] The GNSS timing module is placed in the Mantianxing microwave darkroom and on the UAV platform to provide time information for the satellite navigation signal simulation source of the Mantianxing microwave darkroom and the UAV platform.

[0014] The present invention also provides a darkroom and outdoor environment collaborative testing method for a satellite receiving terminal, comprising the following steps:

[0015] S1: The host computer and the equipment in the microwave darkroom are initialized, and all equipment completes self-test and has no abnormal status;

[0016] S2: The drone platform is powered on and initialized, self-check is completed, and it is ready for takeoff;

[0017] S3: The host computer sends the signal information to be broadcast to the satellite navigation signal source of the darkroom and the UAV platform;

[0018] S4: Wait for the GNSS timing modules in the microwave darkroom and the UAV platform to be successfully synchronized and output PPS and time information normally;

[0019] S5: The UAV platform takes off, automatically flies to the starting position and hovers, and then aligns the transmitting antenna of the UAV platform with the receiving terminal of the satellite under test;

[0020] S6: Power on and initialize the satellite receiving terminal and carrier under test;

[0021] S7: The host computer sends accurate information of the estimated broadcast start time to the satellite navigation signal source of the darkroom and the UAV platform according to the current time;

[0022] S8: When the broadcast start time arrives, the satellite navigation signal sources in the microwave darkroom and the UAV platform begin to send signals through the broadcast antenna;

[0023] S9: The UAV platform automatically flies at a constant speed according to the satellite position and movement direction calculated by the satellite ephemeris of the broadcast signal;

[0024] S10: The satellite receiving terminal under test works normally and outputs RF signals or digital signals to the microwave darkroom;

[0025] S11: The standard satellite positioning terminal in the microwave darkroom works normally after receiving the RF signal or digital signal output by the satellite receiving terminal under test;

[0026] S12: The host computer compares the test data output by the standard satellite positioning terminal and the test satellite receiving terminal and evaluates the results.

[0027] Compared with the prior art, the advantages of the present invention are: the present invention sets test parameters, issues instructions, controls the motion trajectory of the UAV platform, controls the darkroom and outdoor satellite navigation signal sources to simultaneously broadcast satellite navigation signals through the host computer, so as to construct an indoor and outdoor collaborative simulation test environment, solves the large-scale equipment testing needs without a large darkroom, and ensures the comprehensiveness and scientific rationality of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a system shown for implementing the present invention;

[0029] Figure 2 Schematic diagram of the method flow diagram for the implementation of the present invention DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-2 The present invention is further described with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1 The schematic diagram of the system of the present invention is a darkroom and outdoor environment collaborative testing system for satellite receiving terminals, including a Mantianxing microwave darkroom, an unmanned aerial vehicle platform, a standard satellite positioning terminal placed in the Mantianxing microwave darkroom, a satellite receiving terminal under test and a carrier placed in an outdoor environment, a host computer placed outside the Mantianxing microwave darkroom, and a satellite navigation signal simulation source and a GNSS timing module placed in the Mantianxing microwave darkroom and on the unmanned aerial vehicle platform.

[0032] Starry Sky Microwave Darkroom: It is used to build a simulated test environment for satellite signal reception in the darkroom, and provide satellite signals for standard satellite positioning terminals. There are N navigation antennas evenly placed inside the darkroom in the Starry Sky Microwave Darkroom, which are used to broadcast simulated satellite signals in different directions. Each antenna broadcasts the signal of a satellite, which is generated by the satellite navigation signal simulation source according to the test scenario.

[0033] UAV platform: used to simulate the positions of different satellites, so that the azimuth and pitch angles of its broadcast antenna relative to the receiving terminal of the satellite under test are the same as the azimuth and pitch angles of the broadcast antenna in the starry sky microwave darkroom relative to the standard satellite positioning terminal. According to the instructions issued by the host computer, the UAV platform calculates the satellite ephemeris, satellite position, and the pitch angle and azimuth angle of the satellite it represents relative to the device under test. Then, according to the ephemeris information, it keeps consistent with the direction of movement of the represented satellite and moves in that direction at a constant speed, so that the signal it transmits is consistent with the simulated satellite signal.

[0034] Standard satellite positioning terminal: The standard satellite positioning terminal in the microwave darkroom receives the signals broadcast by N navigation antennas in the microwave darkroom and the radio frequency signals or digital signals input by the outdoor satellite receiving terminal, and returns the data results to the host computer; the host computer analyzes and evaluates the test data to determine the validity of the signal generated by the outdoor satellite terminal under test.

[0035] Host computer: Through the test parameter settings, the UAV platform and the satellite navigation signal source of the starry sky microwave darkroom generate M synchronized single-star satellite navigation signals, and use the timing information of the GNSS timing module to maintain time synchronization; at the same time, the UAV platform is controlled to move at a uniform speed according to the position and direction of movement calculated by the satellite ephemeris; the host computer is a standard workstation or server, including processor, memory, hard disk, graphics card, power supply, etc. It has a built-in operating system and test system control application.

[0036] The standard satellite positioning terminal in the Mantianxing microwave darkroom receives the signals broadcast by N navigation antennas in the Mantianxing microwave darkroom and the radio frequency signals or digital signals input by the outdoor satellite receiving terminal, and returns the data results to the host computer; the standard satellite positioning terminal includes a receiving antenna, a down-conversion circuit, a baseband processing circuit, a power supply and an interface, which can demodulate satellite signals to realize positioning, measurement, timing and other functions.

[0037] Satellite navigation signal simulation source: The satellite navigation signal simulation source generates simulated satellite signals according to the built-in data file, and uses the time information of the GNSS timing module to synchronize the broadcast with the simulated satellite signals in the Mantianxing microwave darkroom; the satellite navigation signal simulation source reads the setting parameter instructions sent by the host computer, including signal type, carrier frequency, sampling rate, segment duration, total duration of generated signals, PRN number and telegram, etc. The sampling time axis is designed according to the segment duration and sampling rate, and the ranging code, secondary code, subcarrier, telegram and carrier component are generated by the setting parameters. The sampling time axis is used to uniformly sample each layer of the structure and perform alignment check; the code and carrier are sampled and checked for consistency, and composited into an intermediate frequency signal; the navigation signal is simulated and generated through the noise adding and filtering module. Finally, it is transmitted through the broadcast antenna under the control of the precise time signal.

[0038] GNSS timing module: used to provide high-precision time information for the satellite navigation signal simulation source of the starry sky microwave darkroom and the UAV platform. The GNSS timing module includes receiving antenna, down-conversion circuit, baseband processing circuit, power supply and interface, etc. It can demodulate satellite signals to achieve positioning, timing and other functions. It outputs PPS and time information to provide a unified standard time for the entire test system.

[0039] Satellite receiving terminal and carrier under test: The outdoor satellite receiving terminal under test receives the signals broadcast by different UAV platforms respectively, and transmits the RF signal or digital signal generated by the satellite receiving terminal under test to the microwave darkroom;

[0040] The UAV platform and the satellite receiving terminal and carrier under test are all in an open outdoor environment.

[0041] The host computer and each UAV platform use two-way wireless communication to transmit information. The signals generated by the satellite navigation signal source of the UAV platform and the Mantianxing microwave darkroom use the timing information of the GNSS timing module to maintain time synchronization, and the synchronization accuracy is less than 20ns. The signal generated by the satellite receiving terminal under test is transmitted to the Mantianxing microwave darkroom via a cable.

[0042] The UAV platform moves at a constant speed according to the position and movement direction calculated by the satellite ephemeris based on the parameter instructions issued by the host computer.

[0043] The present invention also provides a darkroom and outdoor environment collaborative testing method for a satellite receiving terminal, comprising the following steps:

[0044] S1: The host computer and the equipment in the microwave darkroom are initialized, and all equipment completes self-test and has no abnormal status;

[0045] S2: The drone platform is powered on and initialized, self-check is completed, and it is ready for takeoff;

[0046] S3: The host computer sends the information of the signal to be broadcast to the satellite navigation signal source in the darkroom and the UAV platform, including satellite signal parameters, signal broadcast duration, power calibration parameters, etc.

[0047] S4: Wait for the GNSS timing modules in the microwave darkroom and the UAV platform to be successfully synchronized, and the PPS and time information can be output normally;

[0048] S5: The UAV platform takes off, automatically flies to the starting position and hovers, and then aligns the transmitting antenna of the UAV platform with the receiving terminal of the satellite under test;

[0049] S6: Power on and initialize the satellite receiving terminal and carrier under test;

[0050] S7: The host computer sends accurate information of the estimated broadcast start time to the satellite navigation signal source of the darkroom and the UAV platform according to the current time;

[0051] S8: When the broadcast start time arrives, the satellite navigation signal sources in the microwave darkroom and the UAV platform begin to send signals through the broadcast antenna;

[0052] S9: The UAV platform automatically flies at a constant speed according to the satellite position and movement direction calculated by the satellite ephemeris of the broadcast signal;

[0053] S10: The satellite receiving terminal under test works normally and outputs RF signals or digital signals to the microwave darkroom;

[0054] S11: The standard satellite positioning terminal in the microwave darkroom works normally after receiving the RF signal or digital signal output by the satellite receiving terminal under test;

[0055] S12: The host computer compares the test data output by the standard satellite positioning terminal and the satellite receiving terminal under test, such as signal strength, positioning accuracy, cold start time, etc., and evaluates the results.

[0056] In summary, this test system method can meet the testing needs of large equipment without a large darkroom, ensuring the comprehensiveness and scientific rationality of the test results. The present invention has strong spatial flexibility and can adapt to the testing needs of large equipment of various forms and styles, thereby saving space and reducing site construction expenses.

[0057] Although the present invention has been disclosed as above with preferred implementation cases, it is not intended to limit the present invention. Any technician familiar with the art can use the above disclosed technical content to make many possible changes and modifications to the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A satellite receiving terminal-oriented microwave darkroom and outdoor environment collaborative testing system, characterized in that: include: The starry sky microwave darkroom is used to build a simulated test environment for satellite signal reception in the darkroom, providing satellite signals for standard satellite positioning terminals; The drone platform is placed outside the star-filled microwave darkroom to simulate the positions of different satellites; The standard satellite positioning terminal is placed in the star-filled microwave darkroom to receive the signals broadcast by the navigation antenna in the microwave darkroom and the signals input by the outdoor satellite receiving terminal, and return the data results to the host computer; The satellite receiving terminal and carrier under test are placed outside the Mantianxing microwave darkroom to receive signals broadcast by different UAV platforms and transmit the signals generated by the satellite receiving terminal under test to the microwave darkroom; The host computer is placed outside the Sky-Star microwave darkroom and is used to control the UAV platform and the synchronous single-star satellite navigation signal generated by the satellite navigation signal source, and realize the uniform motion control of the position and movement direction of the UAV platform; The satellite navigation signal simulation source is placed in the Mantianxing microwave darkroom and on the UAV platform to generate simulated satellite signals and use the time information of the GNSS timing module to synchronize the broadcast with the simulated satellite signals in the Mantianxing microwave darkroom; The GNSS timing module is placed in the Mantianxing microwave darkroom and on the UAV platform to provide time information for the satellite navigation signal simulation source of the Mantianxing microwave darkroom and the UAV platform.

2. The method for collaborative testing of a satellite receiving terminal in a microwave darkroom and an outdoor environment according to claim 1, characterized in that: The azimuth and elevation angles of the UAV platform's broadcasting antenna relative to the satellite receiving terminal under test are the same as the azimuth and elevation angles of the broadcasting antenna in the Starry Sky microwave darkroom relative to the standard satellite positioning terminal.

3. The method for collaborative testing of a satellite receiving terminal in a microwave darkroom and an outdoor environment according to claim 1, characterized in that: According to the instructions issued by the host computer, the UAV platform calculates the satellite ephemeris, satellite position, and pitch angle and azimuth angle of the represented satellite relative to the device under test, and then keeps consistent with the movement direction of the represented satellite according to the ephemeris information and moves in that direction at a constant speed, so that the signal emitted by the UAV is consistent with the simulated satellite signal.

4. The method for collaborative testing of a satellite receiving terminal in a microwave darkroom and an outdoor environment according to claim 1, characterized in that: The signals generated by the satellite navigation signal simulation source of the UAV platform and the Starry Sky microwave darkroom use the timing information of the GNSS timing module to maintain time synchronization, and the synchronization accuracy is less than 20ns.

5. A darkroom and outdoor environment collaborative testing method for satellite receiving terminals, characterized in that: The specific steps are as follows: S1: The host computer and the equipment in the microwave darkroom are initialized, and all equipment completes self-test and has no abnormal status; S2: The drone platform is powered on and initialized, self-check is completed, and it is ready for takeoff; S3: The host computer sends the signal information to be broadcast to the satellite navigation signal source of the darkroom and the UAV platform; S4: Wait for the GNSS timing modules in the microwave darkroom and the UAV platform to be successfully synchronized and output PPS and time information normally; S5: The UAV platform takes off, automatically flies to the starting position and hovers, and then aligns the transmitting antenna of the UAV platform with the receiving terminal of the satellite under test; S6: Power on and initialize the satellite receiving terminal and carrier under test; S7: The host computer sends accurate information of the estimated broadcast start time to the satellite navigation signal source of the darkroom and the UAV platform according to the current time; S8: When the broadcast start time arrives, the satellite navigation signal sources in the microwave darkroom and the UAV platform begin to send signals through the broadcast antenna; S9: The UAV platform automatically flies at a constant speed according to the satellite position and movement direction calculated by the satellite ephemeris of the broadcast signal; S10: The satellite receiving terminal under test works normally and outputs RF signals or digital signals to the microwave darkroom; S11: The standard satellite positioning terminal in the microwave darkroom works normally after receiving the RF signal or digital signal output by the satellite receiving terminal under test; S12: The host computer compares the test data output by the standard satellite positioning terminal and the test satellite receiving terminal and evaluates the results.

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