Navigation receiver performance test system based on wired injection simulation

Abstract

The invention belongs to the technical field of wired injection type complex navigation signal environment construction, and particularly discloses a navigation receiver performance test system based on wired injection simulation, which is characterized in that a scene generation and evaluation unit virtualizes a navigation electromagnetic environment through a digital simulation modeling technology, simulates a navigation terminal, an operation state and a deployment condition of interference equipment, and performs simulation on the navigation electromagnetic environment; the test signal simulation unit generates a test signal according to the simulation scene and realizes test signal space propagation simulation; the navigation signal simulation unit generates a navigation signal according to a simulation scene, the navigation antenna simulation unit receives a test signal and the navigation signal and outputs the test signal and the navigation signal to the navigation receiver, and the scene generation and evaluation unit evaluates the performance of the navigation receiver according to a positioning result of the navigation receiver and constructs a test environment required by the performance test of the navigation receiver. The method has the advantages of multiple construction environments, high repeatability and high test efficiency, and meets the performance test requirements of the navigation receiver in a complex electromagnetic environment.

Description

Technical Field

[0001] The invention belongs to the technical field of wired injection type complex navigation signal environment construction, and specifically discloses a navigation receiver performance test system based on wired injection simulation. Background Art

[0002] With the official completion and opening of the BeiDou-3 satellite navigation system, various new BeiDou-3 navigation terminal devices will be used in automobiles, airplanes, ships and various military platforms in the future, playing an irreplaceable role in ensuring national security and promoting economic development. However, due to the inherent fragility and limitations of satellite navigation systems, satellite navigation signals are extremely susceptible to unintentional interference in complex electromagnetic environments, and may also face various forms of targeted in-band intentional interference, with interference power ranging from a few watts to hundreds of kilowatts, and in a variety of styles. Faced with complex application environments, it is necessary to carry out performance testing of navigation receivers in complex electromagnetic environments, but the field test environment still has deficiencies in terms of environmental construction diversity, test result accuracy and test efficiency, and cannot meet current test needs. Summary of the invention

[0003] In order to solve the problem in the background technology, the present invention discloses a navigation receiver performance test system based on wired injection simulation, which constructs the test environment required for the navigation receiver performance test and has the advantages of multiple construction environments, strong repeatability and high test efficiency.

[0004] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: A navigation receiver performance test system based on wired injection simulation comprises a navigation signal simulation unit, a test signal simulation unit, a navigation antenna simulation unit and a scenario generation and evaluation unit. The scenario generation and evaluation unit virtualizes a navigation electromagnetic environment through digital simulation modeling technology, simulates a navigation terminal, an operating state and the deployment of interference equipment. The test signal simulation unit generates a test signal in an excitation signal generation environment according to a simulation scenario and realizes a test signal space propagation simulation. The navigation signal simulation unit generates a navigation signal in an environment according to a simulation scenario. The navigation antenna simulation unit receives the test signal and the navigation signal, simulates the reception of the navigation signal and the test signal by modeling the navigation antenna, and outputs them to the navigation receiver. The scenario generation and evaluation unit evaluates the navigation receiver performance according to the positioning result of the navigation receiver, and realizes performance testing of navigation receivers of various platforms when equipped with various types of navigation antennas.

[0005] Furthermore, the navigation receiver performance test system based on wired injection simulation also includes a time and frequency reference device, which provides a time and frequency basis for the scenario generation and evaluation unit, the navigation signal simulation unit, the test signal simulation unit, and the navigation antenna simulation unit through 10M, 1pps or PTP timing methods, thereby achieving time and frequency unification of the test environment.

[0006] Furthermore, in the navigation receiver performance test system based on wired injection simulation, the scenario generation and evaluation unit includes scenario design, scenario simulation, situation display and evaluation analysis modules. The scenario design module realizes scenario design through antenna configuration, platform configuration, environment configuration and parameter configuration. The scenario simulation module is used to perform scenario solution on the simulation scenario elements during the test process, generate corresponding control parameters and send them to the test signal simulation unit, navigation signal simulation unit and navigation antenna simulation unit in real time to simulate the generation, propagation and reception of navigation signals and test signals. The situation display module is used to receive the status information of the test signal simulation unit, navigation signal simulation unit, navigation antenna simulation unit and the navigation receiver under test to realize simulation situation display, and send the received information to the evaluation analysis module. The evaluation analysis module records the status information of the test signal simulation unit, navigation signal simulation unit and navigation antenna simulation unit, and displays the status of the navigation receiver platform and the interference source platform in real time. Situation display and real-time evaluation are realized by real-time recording and storing the positioning results fed back by the navigation receiver and the status information of each unit. After the simulation, a test evaluation report is formed.

[0007] Furthermore, in the navigation receiver performance test system based on wired injection simulation, the test signal simulation unit includes a test signal simulation source and a wireless channel emulator. The test signal simulation unit is program-controlled by a scenario generation and evaluation unit. According to the issued scenario parameters, the test signal simulation source generates a corresponding number of RF signals according to the issued number of channels, frequency, switching time, power and interference pattern scenario parameters, and sends the RF signals to the wireless channel emulator. The wireless channel emulator simulates the spatial electromagnetic propagation characteristics and wavefront amplitude and phase characteristics of the wavefront signal from the test signal to the navigation antenna according to the issued power attenuation, delay and Doppler frequency shift parameters, and outputs the interference RF signal to the navigation antenna simulation unit by wired injection.

[0008] Furthermore, in the navigation receiver performance test system based on wired injection simulation, the navigation signal simulation unit includes a navigation signal simulator and simulation control software. The navigation signal simulation unit is program-controlled by the scenario generation and evaluation unit. According to the motion state, environmental parameters and wavefront simulation parameters of the navigation receiver platform issued, the navigation signal simulator simulates the spatial electromagnetic propagation characteristics of the wavefront signal from the satellite navigation to the navigation receiver antenna, and generates the satellite navigation radio frequency signal under the scenario. The simulation control software outputs the interference radio frequency signal to the navigation antenna simulation unit by wired injection.

[0009] Furthermore, in the navigation receiver performance test system based on wired injection simulation, the navigation antenna simulation unit includes a navigation antenna signal processing host and a wavefront combiner. The wavefront combiner combines the satellite navigation signal and the test signal and outputs them to the navigation antenna signal processing host. The navigation antenna signal processing host performs anti-interference processing on the combined signal according to the antenna style, antenna radiation pattern, anti-interference algorithm and other parameters issued, and then outputs the navigation signal after interference suppression to the navigation receiver under test.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a navigation receiver performance test system based on wired injection simulation, comprising a navigation signal simulation unit, a test signal simulation unit, a navigation antenna simulation unit and a scenario generation and evaluation unit. The scenario generation and evaluation unit virtualizes a navigation electromagnetic environment through a digital simulation modeling technology, simulates a navigation terminal, an operating state and the deployment of an interference device, the test signal simulation unit generates a test signal in an excitation signal generation environment according to a simulation scenario and realizes a test signal space propagation simulation; the navigation signal simulation unit generates a navigation signal in an environment according to a simulation scenario, the navigation antenna simulation unit receives the test signal and the navigation signal, simulates the reception of the navigation signal and the test signal by modeling the navigation antenna, and outputs the signals to the navigation receiver, the scenario generation and evaluation unit evaluates the navigation receiver performance according to the positioning result of the navigation receiver, and realizes the performance test of navigation receivers of various platforms in combination with various types of navigation antennas. The invention designs a wired injection complex navigation signal environment simulation system based on the actual situation and actual needs, constructs a test environment required for the performance test of the navigation receiver, has multiple constructed environments, strong repeatability and high test efficiency, and meets the performance test requirements of the navigation receiver in a complex electromagnetic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a navigation receiver performance test system based on wired injection simulation of the present invention; Figure 2 It is a schematic diagram of a navigation receiver performance test system based on wired injection simulation of the present invention; Figure 3It is a schematic diagram of the working process of the navigation receiver performance test system based on wired injection simulation of the present invention. DETAILED DESCRIPTION

[0012] The navigation receiver performance test system based on wired injection simulation of the present invention has a structure as follows: Figure 1 As shown, the system principle is as follows Figure 2 As shown, the workflow is as follows Figure 3 As shown below, combined with the attached Figure 1-3 , the navigation receiver performance test system based on wired injection simulation of the present invention is elaborated in detail. First, the scene generation and evaluation unit virtualizes a complex navigation signal environment through digital simulation modeling technology. The scene elements include antenna configuration, platform configuration, environment configuration, parameter configuration, etc. The test signal in the environment is generated by a test signal simulation source, and the test signal space propagation simulation is performed through a wireless channel simulator; the navigation signal in the environment is generated by a navigation signal simulator, and the navigation antenna simulation unit receives the wired injection test signal and the navigation signal according to the navigation receiver platform and the navigation antenna modeling parameters, and suppresses interference through an anti-interference algorithm, and finally outputs it to the navigation receiver under test. The scene generation and evaluation unit displays the status of the navigation receiver platform and the interference source platform in real time, and realizes situation display and real-time evaluation by recording and storing the positioning results fed back by the navigation receiver and the status information of each unit in real time. After the simulation, a test evaluation report is formed. The working principle of each unit is described in detail as follows: (1) Scenario Generation and Evaluation Unit The scenario generation and evaluation unit includes four modules: scenario design, scenario simulation, situation display, and evaluation and analysis. Among them, the scenario design module realizes scenario design through antenna configuration, platform configuration, environment configuration, parameter configuration, etc.; the scenario simulation module solves the simulation scenario, generates corresponding control parameters, and sends them to the test signal simulation unit, navigation signal simulation unit, and navigation antenna simulation unit in real time to simulate the generation, propagation, and reception of navigation signals and test signals. At the same time, it receives the status information of the test signal simulation unit, navigation signal simulation unit, navigation antenna simulation unit, and the navigation receiver under test, realizes simulation situation display, and sends it to the evaluation and analysis module. The evaluation and analysis module realizes the functions of real-time evaluation and analysis and test evaluation report generation by recording the status information of the test signal simulation unit, navigation signal simulation unit, and navigation antenna simulation unit.

[0013] The working principle of the scenario generation and evaluation unit is as follows: 1.1) Scenario preparation stage, this stage mainly completes antenna configuration, platform configuration, environment configuration, parameter configuration, etc. The first is antenna configuration, which is divided into two parts: navigation receiver antenna configuration and test signal source antenna configuration. When configuring ordinary antennas, you can set the gain curve to generate antenna radiation pattern. When configuring array antennas, you can set the number of array elements, center frequency and antenna radiation pattern corresponding to the array, and view the three-dimensional display in real time; the second is platform configuration, which is divided into navigation receiver platform configuration and test signal source platform configuration. When configuring, select the platform 3D model in the platform model library, set the model's posture size and center point, select the carrying equipment (navigation antenna or test signal antenna), and set equipment parameters; complete the environment parameter configuration again, build an empty scene, and complete the environment configuration by importing geographic data, setting weather, and simulating the initial time; finally, complete the parameter configuration, which includes test signal source platform parameters and navigation receiver platform parameters. Test signal source platform parameters include the number of test signal source platform deployments, motion status, test signal frequency and test signal style. Navigation receiver platform parameters include navigation receiver platform motion trajectory and the navigation signal receiving frequency of the tested navigation receiver.

[0014] 1.2) Testing phase: This phase mainly completes simulation calculation, instrument and equipment interaction and control, data analysis, display and recording, situation visualization, etc. Simulation calculation mainly includes navigation receiver platform motion state calculation, test signal source motion state calculation, simulated signal sending and receiving, simulated signal link propagation, simulated array antenna reception, signal shielding calculation, thermal map calculation, etc. Instrument and equipment interaction and control controls the navigation signal simulation unit and the test signal simulation unit to generate corresponding signals according to the simulation calculation results, and synchronously obtains the equipment status. Data analysis, display and recording records the navigation signal simulation unit, test signal simulation unit, navigation antenna simulation unit, and the navigation receiver under test data during the test process into the database, and outputs them to the data analysis and evaluation module at the same time to obtain and display the analysis and evaluation results. Situation visualization mainly includes scene visualization, equipment visualization, and analysis and evaluation visualization.

[0015] 1.3) The test result evaluation phase mainly completes real-time data analysis and evaluation and test evaluation report generation. Real-time evaluation and analysis are carried out based on the status information of the real-time received navigation signal simulation unit, test signal simulation unit, navigation antenna simulation unit, and navigation receiver under test. After the simulation is completed, a test report is generated.

[0016] (2) Test signal simulation unit The test signal simulation unit receives the program-controlled parameters of the scenario generation and evaluation unit, and the test signal simulation source outputs the RF signal to the wireless channel emulator. The wireless channel emulator calculates the propagation characteristics of the test signal reaching the receiver antenna according to the program-controlled parameters, generates the control parameters of the wireless channel emulator, and performs access, RF conversion, and power adjustment on the test signal. The working principle of the test signal simulation unit is as follows: 2.1) The scenario generation and evaluation unit generates the control parameters of the test signal simulation source including the test signal style, frequency, switching time, number of channels, power, etc. of each channel according to the number of test signal devices, test signal style, frequency, switching time, power and other factors. The test signal simulation source generates the test signal according to the number of channels, test signal style, frequency, switching time, power parameters and inputs it to the wireless channel emulator; 2.2) The scenario generation and evaluation unit constructs a test signal channel fading model based on the motion state of the test signal source, the motion state of the navigation receiver, the test signal source antenna model, the geographical environment, and the climate information. According to the navigation antenna model parameters and the spatial direction of the test signal, the amplitude and phase characteristics of the test signals of different array elements are adjusted to generate wavefront simulation parameters such as attenuation, delay, and Doppler value. The wireless channel emulator simulates the spatial propagation of the test signal based on the wavefront simulation parameters and outputs the test signal to the wavefront combiner of the navigation antenna simulation unit.

[0017] (3) Navigation signal simulation unit The navigation signal simulation unit includes simulation control software and a navigation signal simulator. The navigation signal simulator generates a satellite navigation signal under the scenario according to the scenario generation and evaluation unit, simulates the spatial electromagnetic propagation characteristics of the wavefront signal from the satellite navigation to the navigation antenna, and generates a corresponding code signal.

[0018] The working principle of the navigation signal simulation unit is as follows: 3.1) The scenario generation and evaluation unit provides environmental parameters and navigation receiver platform motion status to the navigation signal simulation unit simulation control software. Subsequently, the navigation signal simulation unit simulation control software completes the calculation of satellite orbit, navigation message, time system, atmospheric model and other satellite navigation parameters required for satellite signal simulation, and uploads the satellite position to the scenario generation and evaluation unit; 3.2) The scenario generation and evaluation unit calculates the path difference of different incoming navigation and test signals reaching different elements of the array antenna based on the satellite position information provided by the simulation control software of the navigation signal simulation unit, combined with the navigation receiver platform motion and navigation antenna parameters, with the reference array element as the center, and generates the navigation antenna wavefront simulation parameters; 3.3) Navigation signal simulation unit The navigation signal simulator receives the wavefront simulation parameters of the navigation antenna, realizes the amplitude and phase adjustment of the wavefront signal of each array element of the navigation antenna, generates the navigation signal of each array element, and outputs it to the wavefront combiner of the navigation antenna simulation unit.

[0019] (4) Navigation antenna simulation unit The navigation antenna simulation unit is mainly composed of two parts: the navigation antenna signal processing host and the wavefront combiner. The device is mainly used to simulate the antenna characteristics of navigation receivers on various mission platforms such as vehicles, ships, aircraft, and missiles.

[0020] The working principle of the navigation antenna simulation unit is as follows: the wavefront combiner receives the test signal of the test signal simulation unit product and the satellite navigation signal generated by the navigation signal simulation unit, and combines them and outputs them to the navigation signal processing host. The navigation antenna signal processing host loads the antenna signal processing algorithm according to the navigation antenna model set by the user in the scene generation and evaluation unit, suppresses the test signal processing on the combined signal, and then outputs the navigation signal after suppressing the test signal to the navigation receiver under test.

[0021] The working process of the navigation receiver performance test system based on wired injection simulation of the present invention is as follows: In the test preparation stage, users use the scenario design module of the scenario generation and evaluation unit to design scenarios, including antenna configuration, platform configuration, environment configuration, parameter configuration, etc. During the test phase, the scenario simulation module generates the test signal simulation unit control parameters including the number of channels, interference pattern, frequency, delay, power, phase, and Doppler frequency shift according to the configuration information, and generates the navigation signal simulation unit control parameters including environmental parameters, navigation receiver platform motion state, and wavefront simulation parameters; the scenario simulation module sends the control parameters to the test signal access unit, navigation signal simulation unit, and navigation antenna simulation unit respectively; The test signal simulation unit generates a test signal according to the number of channels, interference pattern, frequency, switching time, and power. The test signal simulation source outputs the test signal RF to the wireless channel simulator and simulates the test signal received by each array element of the navigation antenna according to parameters such as attenuation, delay, and Doppler value. The scenario simulation module of the scenario generation and evaluation unit provides environmental parameters and navigation receiver platform motion status to the test control software of the navigation signal simulation unit. Subsequently, the simulation control software of the navigation signal simulation unit completes the calculation of satellite navigation parameters such as satellite orbit, navigation message, time system, atmospheric model, etc. required for satellite signal simulation, and uploads the satellite position to the scenario generation and evaluation unit. The scenario generation and evaluation unit calculates the path difference of different incoming navigation and test signals reaching different array elements of the array antenna based on the satellite position information provided by the navigation signal simulator of the navigation signal simulation unit, combined with the motion state of the navigation receiver platform and the navigation antenna parameters, with the reference array element as the center, and generates the navigation antenna wavefront simulation parameters; The wavefront combiner of the navigation antenna simulation unit combines the input test signal and the navigation signal to generate a navigation antenna receiving signal. The navigation antenna signal processing host transmits the signal to the navigation receiver under test after interference suppression by the internal anti-interference algorithm. The navigation receiver under test performs positioning and solves the positioning, and feeds the positioning results back to the scenario generation and evaluation unit in real time; If the navigation receiver under test is interfered, the navigation receiver platform performs motion state simulation according to the platform dynamics model, and the scenario generation and simulation evaluation unit simulates the subsequent navigation signal and test signal based on the motion state simulation result; The scenario generation and evaluation software uses the collected solution information of the navigation receiver to process and analyze the anti-interference effect of the receiver based on the evaluation index system and evaluation rules, and generates an evaluation report, thereby realizing the performance test of navigation receivers of various platforms when paired with various types of navigation antennas.

[0022] The present invention is based on a navigation receiver performance test system with wired injection simulation. Taking into account the actual situation and practical needs, a wired injection complex navigation signal environment simulation system is designed to construct the test environment required for the navigation receiver performance test. The system has multiple constructed environments, strong repeatability and high test efficiency, thus meeting the performance test requirements of the navigation receiver in a complex electromagnetic environment.

Claims

1. A navigation receiver performance test system based on wired injection simulation, characterized by: It includes a navigation signal simulation unit, a test signal simulation unit, a navigation antenna simulation unit and a scenario generation and evaluation unit. The scenario generation and evaluation unit virtualizes the navigation electromagnetic environment through digital simulation modeling technology, simulates the navigation terminal, operating status and deployment of interference equipment. The test signal simulation unit generates a test signal in the excitation signal generation environment according to the simulation scenario and realizes the test signal space propagation simulation; the navigation signal simulation unit generates the navigation signal in the environment according to the simulation scenario. The navigation antenna simulation unit receives the test signal and the navigation signal, simulates the reception of the navigation signal and the test signal by modeling the navigation antenna, and outputs them to the navigation receiver. The scenario generation and evaluation unit evaluates the performance of the navigation receiver according to the positioning result of the navigation receiver, and realizes the performance test of the navigation receivers of various platforms when equipped with various types of navigation antennas.

2. The navigation receiver performance test system based on wired injection simulation according to claim 1 is characterized in that: It also includes time and frequency reference equipment, which provides the time and frequency basis for the scenario generation and evaluation unit, navigation signal simulation unit, test signal simulation unit, and navigation antenna simulation unit through 10M, 1pps or PTP timing methods, thereby achieving time and frequency unification of the test environment.

3. The navigation receiver performance test system based on wired injection simulation according to claim 2 is characterized in that: The scenario generation and evaluation unit includes scenario design, scenario simulation, situation display and evaluation and analysis modules. The scenario design module realizes scenario design through antenna configuration, platform configuration, environment configuration and parameter configuration. The scenario simulation module is used to perform scenario solution on the simulation scenario elements during the test process, generate corresponding control parameters and send them to the test signal simulation unit, navigation signal simulation unit and navigation antenna simulation unit in real time to simulate the generation, propagation and reception of navigation signals and test signals. The situation display module is used to receive the status information of the test signal simulation unit, navigation signal simulation unit, navigation antenna simulation unit and the navigation receiver under test to realize simulation situation display, and send the received information to the evaluation and analysis module. The evaluation and analysis module records the status information of the test signal simulation unit, navigation signal simulation unit and navigation antenna simulation unit, and displays the status of the navigation receiver platform and the interference source platform in real time. By real-time recording and storing the positioning results fed back by the navigation receiver and the status information of each unit, situation display and real-time evaluation are realized. After the simulation is completed, a test evaluation report is formed.

4. The navigation receiver performance test system based on wired injection simulation according to claim 2 is characterized in that: The test signal simulation unit includes a test signal simulation source and a wireless channel emulator. The test signal simulation unit is program-controlled by the scenario generation and evaluation unit. According to the sent scenario parameters, the test signal simulation source generates a corresponding number of RF signals according to the sent number of channels, frequency, switching time, power and interference pattern scenario parameters, and sends the RF signals to the wireless channel emulator. The wireless channel emulator simulates the spatial electromagnetic propagation characteristics and wavefront amplitude and phase characteristics of the wavefront signal from the test signal to the navigation antenna according to the sent power attenuation, delay and Doppler frequency shift parameters, and outputs the interference RF signal to the navigation antenna simulation unit through wired injection.

5. The navigation receiver performance test system based on wired injection simulation according to claim 2 is characterized in that: The navigation signal simulation unit includes a navigation signal simulator and simulation control software. The navigation signal simulation unit is program-controlled by the scenario generation and evaluation unit. According to the motion state of the navigation receiver platform, environmental parameters, and wavefront simulation parameters issued, the navigation signal simulator simulates the spatial electromagnetic propagation characteristics of the wavefront signal from the satellite navigation to the navigation receiver antenna, and generates the satellite navigation RF signal under the scenario. The simulation control software outputs the interference RF signal to the navigation antenna simulation unit by wired injection.

6. The navigation receiver performance test system based on wired injection simulation according to claim 2 is characterized in that: The navigation antenna simulation unit includes a navigation antenna signal processing host and a wavefront combiner. The wavefront combiner combines the satellite navigation signal and the test signal and outputs them to the navigation antenna signal processing host. The navigation antenna signal processing host performs anti-interference processing on the combined signal according to the antenna style, antenna radiation pattern, anti-interference algorithm and other parameters issued, and then outputs the navigation signal after interference suppression to the navigation receiver under test.

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