Multi-user GNSS (Global Navigation Satellite System) analog source signal closed-loop self-checking system and method

Abstract

The invention discloses a multi-user GNSS analog source signal closed-loop self-checking system and method. Comprises: a test computer for determining a simulation scene according to the number of users connected to a test scene background; the multi-user GNSS signal simulation source generates a GNSS frequency point radio frequency signal; the shunt control module is provided with shunt gain control sub-modules in one-to-one correspondence with users, and outputs ground user self-check signals; when a radio frequency switch in the closed-loop detection module is in an absolute positioning scene, the conduction direction is unidirectional conduction to the first combining module or the second combining module; in a relative positioning scene, the first combining module and the second combining module are conducted in two directions at the same time; and respectively sending the synthesized first synthesis signal and / or second synthesis signal to the corresponding first navigation receiver and / or second navigation receiver. According to the invention, the scale and the external interface of the self-checking equipment are reduced.

Description

Technical Field

[0001] This application relates to the field of radio frequency testing technology, and specifically relates to a multi-user GNSS simulation source signal closed-loop self-check system and method. Background Art

[0002] The ground GNSS navigation simulation source is used to output specific navigation constellation radio frequency signals to the navigation receiver. The navigation receiver receives and calculates the navigation information. After a certain period of calculation and convergence, the positioning parameters of the current spacecraft are obtained, so as to intuitively describe the position and motion state of the spacecraft in space.

[0003] Therefore, before the spacecraft test, the self-calibration of the ground GNSS navigation simulation source is particularly important. For the traditional ground GNSS navigation simulation source, each user needs to be equipped with a navigation receiver for self-check, and the multi-user ground GNSS navigation simulation source needs to be equipped with multiple navigation receivers, which makes the entire self-check system too large and the research and development cost too high. At the same time, there is no mutual communication interface between multiple navigation receivers, and only the self-check requirements for absolute positioning can be realized, and the function verification of ground equipment is relatively single. Summary of the Invention

[0004] In view of this, this application provides a multi-user GNSS simulation source signal closed-loop self-check system and method, which can solve the technical problems of the traditional ground GNSS navigation simulation source self-check test system being large in composition, too large in volume, high in cost, low in test efficiency, and single in verification function.

[0005] To solve the above technical problems, this application is implemented as follows.

[0006] A multi-user GNSS simulation source signal closed-loop self-check system includes: A test computer deployed with scenario management software, and the test scenario background corresponding to the test computer is connected to one or more users; the scenario management software determines the simulation scenario as an absolute positioning scenario or a relative positioning scenario according to the number of users connected to the test scenario background; The multi-user GNSS signal simulation source generates GNSS frequency point radio frequency signals for each user corresponding to the simulation scenario according to the simulation scenario; In the shunt control module, there are shunt gain control sub-modules corresponding to the users one by one. The shunt gain control sub-module performs signal synthesis and power adjustment on the corresponding GNSS frequency point radio frequency signal, and outputs a ground user self-check signal; The RF switches in the closed-loop detection module that correspond one-to-one with the shunt gain control sub-module are used to conduct the ground user self-test signal; in the absolute positioning scenario, the conduction direction of the RF switch is unidirectional conduction to the first combining module or the second combining module; in the relative positioning scenario, the conduction direction of the RF switch is bidirectional and simultaneously conducts to the first combining module and the second combining module respectively; the first combining module and / or the second combining module respectively synthesize the ground user self-test signals they receive, and send the synthesized first synthesized signal and / or second synthesized signal to the corresponding first navigation receiver and / or second navigation receiver in the receiver module respectively.

[0007] Preferably, for the orbits of different spacecrafts where the user is located, when connecting one user in the background of the test scenario, the simulation scenario is the absolute positioning scenario; when connecting two users in the background of the test scenario, the simulation scenario is the relative positioning scenario; in the relative positioning scenario, the first navigation receiver and the second navigation receiver respectively receive the GNSS navigation simulation signals of the two users.

[0008] Preferably, the formula for the shunt gain control sub-module to synthesize and adjust the power of the GNSS frequency point RF signal is:

[0009] In the formula, are all input signals, represents the output signal, is a constant, is the memory depth, are all variables, represents the kernel of the P-order power amplifier Volterra series model, are the partial order coefficients respectively.

[0010] Preferably, the output of the shunt gain control sub-module after processing the GNSS frequency point RF signal is one large signal and two small signals. Select any one of the one large signal and one small signal to connect to the spacecraft GNSS navigation receiver, and the remaining one small signal is used as the ground user self-test signal corresponding to this shunt gain control sub-module; The expression of the ground user self-test signal is:

[0011] In the formula, is the output signal after passing through an attenuator with a gain of , is the input signal, G is the gain value.

[0012] Preferably, the scenario management software has the functions of running control of multi-user GNSS navigation simulation sources, management of test projects and processes, processing and evaluation of test data, and output and storage of test results.

[0013] A method for closed-loop self-checking of multi-user GNSS simulation source signals, based on the multi-user GNSS simulation source signal closed-loop self-checking system as described above, the method includes: Step S1: Obtain a scenario file, and determine the simulation scenario and simulation task identifier based on the scenario file; Step S2: Trigger the multi-user GNSS simulation source signal closed-loop self-checking system to perform self-checking of the relative position or absolute position of the user based on the simulation scenario and simulation task identifier.

[0014] A computer-readable storage medium stores multiple instructions; the multiple instructions are used to be loaded and executed by a processor to perform the method as described above.

[0015] An electronic device, characterized in that the electronic device includes: A processor for executing multiple instructions; A memory for storing multiple instructions; Wherein, the multiple instructions are used to be stored by the memory and loaded and executed by the processor to perform the method as described above.

[0016] This application sets up a shunt control module and a closed-loop detection module. Through the traversal combination of internal RF switches and combiners, the navigation signals output by a certain two users can be respectively connected to the first navigation receiver and the second navigation receiver. Mutual communication can be achieved between the two navigation receivers, which can meet the absolute positioning and relative positioning self-checking requirements for one background corresponding to one user and one background corresponding to two users, reduce the research and development cost and scale of the self-checking system, and at the same time more fully and comprehensively verify the functions of ground test equipment. At the same time, on the premise of not affecting the normal testing of the spacecraft, the closed-loop self-check is used as an auxiliary means for interpretation. If there are deviations or abnormalities in the GNSS navigation and positioning results of the spacecraft, it is possible to assist in judging whether there are problems with the output of the multi-user GNSS simulation source based on the positioning conditions of the first navigation receiver or the second navigation receiver in the receiver module, which is convenient for satellite-ground isolation during troubleshooting and more quickly locates the problem.

[0017] Beneficial effects: (1) This application can meet the self-checking requirements of absolute positioning and relative positioning in single-user and multi-user usage scenarios, and can quickly and efficiently complete the self-checking functions of absolute positioning and relative positioning of multi-user GNSS simulation sources; (2) This application integrates a multi-user GNSS signal simulation source, a branch control module, a closed-loop detection module, and a receiver module, which can be put on the shelf, thereby reducing the scale and external interface of the self-test equipment while also reducing costs, and avoiding inefficient operations such as manual line switching; at the same time, the host computer software of each test equipment is integrated into the scene management software, and the background management software, the closed-loop detection module control software, and the receiver control and monitoring software respectively control and monitor the key parameters of the multi-user GNSS navigation simulation source, the closed-loop detection module, and the receiver module through the network port, thereby improving the integration and programmability between the equipment; (3) This application can use a closed-loop self-test method to monitor the positioning of the navigation receiver in the receiver module without affecting the normal test of the spacecraft, and can be used as a redundant interpretation and backup method in electrical performance testing. The branch control module in the system can divide the RF signal power output by the multi-user GNSS signal simulation source into three paths, one large signal and two small signals, and can select one large signal or one small signal to be sent to the spacecraft according to the situation. The other small signal is the ground user self-test signal. By switching the internal RF switch in the closed-loop detection module, the absolute positioning function of one user corresponding to a test scenario background can be realized in a time-sharing manner, such as the use scenario of a single satellite; at the same time, the data interaction between the first navigation receiver and the second navigation receiver can also be used to realize the relative positioning function of two users corresponding to a test scenario background, such as the use scenario of networking spacecraft and rendezvous and docking spacecraft; (4) This application can fully and comprehensively verify the absolute positioning and relative positioning functions of single and multi-users before the electrical measurement of the spacecraft, thereby enhancing the reliability of the equipment. The multi-user GNSS signal simulation source can realize the trajectory simulation of high, medium and low orbit users, which enhances the versatility of this type of equipment. Through the traversal combination of the internal microwave switch in the branch control module and the closed-loop detection module, 6 types of single-user time-sharing absolute positioning and 15 types of dual-user absolute positioning closed-loop detection can be achieved. The receiver module self-tests for a certain period of time, and then switches to the next group of users for self-test, until all users have completed the self-test and the self-test results are obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A connection diagram of the multi-user GNSS simulation source signal closed-loop self-test system provided for this application; Figure 2 Schematic diagram of the system workflow when performing absolute positioning self-test for this application; Figure 3 This is a schematic diagram of the system workflow when performing relative positioning self-check for this application. DETAILED DESCRIPTION

[0019] The present application is described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] As Figure 1 shown, the present application proposes a closed-loop self-checking system for multi-user GNSS simulation source signals, including: A test computer deployed with scenario management software, and the test scenario background corresponding to the test computer is connected to one or more users; the scenario management software determines the simulation scenario as an absolute positioning scenario or a relative positioning scenario according to the number of users connected to the test scenario background; The multi-user GNSS signal simulation source generates GNSS frequency point RF signals for each user corresponding to the simulation scenario according to the simulation scenario; A branch gain control sub-module corresponding to each user is set in the branch control module, and the branch gain control sub-module performs signal synthesis and power adjustment on the corresponding GNSS frequency point RF signal, and outputs a ground user self-checking signal; The RF switches corresponding to the branch gain control sub-modules in the closed-loop detection module are used to conduct the ground user self-checking signals; in the absolute positioning scenario, the conduction direction of the RF switch is unidirectional conduction to the first combining module or the second combining module; in the relative positioning scenario, the conduction direction of the RF switch is bidirectional and simultaneously conduct to the first combining module and the second combining module respectively; the first combining module and / or the second combining module respectively combine the ground user self-checking signals received by them, and send the combined first combined signal and / or second combined signal to the corresponding first navigation receiver and / or second navigation receiver in the receiver module respectively.

[0021] Further, the users are the orbits of different spacecrafts. When one user is connected to the test scenario background, the simulation scenario is an absolute positioning scenario; when two users are connected to the test scenario background, the simulation scenario is a relative positioning scenario; in the relative positioning scenario, the two navigation receivers respectively receive the GNSS navigation simulation signals of the two users. After positioning respectively, the first navigation receiver and the second navigation receiver communicate through the serial ports connected internally, and can calculate the relative position information and relative speed information between the two users in real time. After a period of time, the relative position information and relative speed information of the two users gradually tend to be consistent. After the internal filtering algorithm converges, the two users perform relative positioning.

[0022] In a specific embodiment of the present application, the multi-user GNSS signal simulation source can output navigation RF self-test signals for 6 users, which are respectively connected to the closed-loop detection module. The closed-loop detection module is internally composed of 6 RF switches and 2 combining modules, and is used to implement the selection and transmission of navigation RF self-test signals for multiple users. The navigation RF self-test signals of these 6 users can be switched to the first navigation receiver or the second navigation receiver through the RF switches and combining modules inside the closed-loop detection module to meet the self-test requirements of 6 users for time-sharing absolute positioning. A communication interface is reserved between the two navigation receivers. When there is a self-test requirement for relative positioning, the first navigation receiver can obtain the position information and speed information in the second navigation receiver in real time, and can calculate the relative position and speed between the two in real time. After the filtering algorithm converges for a period of time, the state of the relative positioning of the two users can be monitored in the scenario management software.

[0023] The scenario management software has the functions of running control of the multi-user GNSS navigation simulation source, management of test items and processes, processing and evaluation of test data, and output and storage of test results.

[0024] The GNSS frequency point RF signal includes BDS / GPS signals and can be extended to other frequency point signals of the global navigation system according to requirements.

[0025] Furthermore, the formula for the signal synthesis and power adjustment of the GNSS frequency point RF signal by the branch gain control sub-module is:

[0026] In the formula, are all input signals, represents the output signal, is a constant, is the memory depth, are all variables, represents the kernel of the P-order power amplifier Volterra series model, are the partial order coefficients respectively.

[0027] The output of the branch gain control sub-module after processing the GNSS frequency point RF signal is one large signal and two small signals. One signal is selected from the one large signal and one small signal and connected to the spacecraft GNSS navigation receiver, and the remaining one small signal is used as the ground user self-test signal corresponding to this branch gain control sub-module; The expression of the ground user self-test signal is:

[0028] In the formula, is the output signal after passing through an attenuator with a gain of ​ is the input signal, and G is the gain value.

[0029] After the output ground user self-check signal passes through the closed-loop detection module, it can be connected to the first or second navigation receiver. The formula is:

[0030] In the formula, can be expressed as the navigation signal input to the first or second navigation receiver, is the pre-factor, is the order of the FIR filter used to describe the closed-loop detection system as a linear time-invariant system, is the input signal input to the closed-loop detection system.

[0031] The multi-user GNSS simulation source signal closed-loop self-check system can receive multiple concurrent simulation tasks. Each simulation task has a corresponding simulation scenario and simulation task identifier. The multi-user GNSS simulation source signal closed-loop self-check system determines the conduction direction of the RF switch based on the absolute positioning scenario or relative positioning scenario. The first combining module and / or the second combining module identify the received ground user self-check signals to be combined based on the simulation task identifier.

[0032] In this application, the closed-loop detection module is mainly used to implement the selection and transmission of navigation analog signals. After the signals are selected by the closed-loop detection module, they are input to the receiver module to assist in realizing the time-sharing output of each ground user self-check signal.

[0033] The first navigation receiver and the second navigation receiver support receiving all frequency points configured by the multi-user GNSS signal simulation source, support absolute positioning of the GNSS frequency RF signals output by the multi-user GNSS signal simulation source, and can send out absolute positioning data and relevant information data; when connecting two users through the test scenario background, through the switching of the RF switch and the combining module in the closed-loop detection module, the GNSS navigation simulation signals of the two users can be sent to the first navigation receiver and the second navigation receiver respectively. The scenario management software can monitor the positioning status of the two navigation receivers in real time. After separate positioning, the navigation receivers communicate through the serial ports connected internally, and can calculate the relative position information and relative speed information between these two users in real time. After a period of time, the relative position information and relative speed information of these two users tend to be consistent. After the internal filtering algorithm converges, the two navigation receivers can perform relative positioning on the GNSS frequency RF signals output by the multi-user GNSS signal simulation source.

[0034] In this application, the multi-user GNSS signal simulator, the splitting control module, the closed-loop detection module, and the receiver module are mounted on the rack and connected and assembled. Through the test intranet, the scenario management software can control and monitor the key parameters of the multi-user GNSS signal simulator, the splitting control module, the closed-loop detection module, and the receiver module. The multi-user GNSS signal simulator, the splitting control module, the closed-loop detection module, and the receiver module are designed with a common rack-mounted size, which can be mounted on the rack, reducing manual intervention for wire-changing operations. At the same time, the network is used to realize the automatic configuration and parameter monitoring of the multi-user GNSS signal simulator, the splitting control module, the closed-loop detection module, and the receiver module, which plays the role of liberating human resources and further improving the intelligence and automation of the multi-user GNSS simulator signal closed-loop self-check system.

[0035] The multi-user GNSS simulator signal closed-loop self-check system can be used as a redundant backup monitoring means for the entire satellite. When in use, in the simulator list of the scenario management software, check the users to be monitored in the background of the corresponding test scenario and click on the closed-loop self-check. Subsequently, the scenario management software will automatically detect the number of users connected to the background of the monitored test scenario. If it is a dual-user scenario, the corresponding RF switches in the closed-loop detection module are controlled to be in the state of conducting upward and downward simultaneously, so that the self-check signals output by the dual-users are respectively connected to the first navigation receiver and the second navigation receiver in the receiver module; if it is a single-user scenario, the corresponding RF switch in the closed-loop monitoring module is controlled to be in the upward-connected state, so that the self-check signal output by the single-user is connected to the first navigation receiver in the receiver module. Subsequently, the detection results, that is, the results of relative positioning and absolute positioning, will be displayed in real time in the simulator list. If during the electrical test of the spacecraft, abnormal phenomena such as non-positioning are found in the on-board GNSS navigation receiver, the status of the receiver module can be monitored in the simulator list of the multi-user GNSS simulator and the displayed detection results can be viewed, which is convenient for fault location and satellite-ground isolation of the spacecraft. The multi-user GNSS simulator signal closed-loop self-check system can realize the usage scenarios of absolute positioning for a single user and relative positioning for dual users, with a richer object-oriented nature.

[0036] Such as Figures 2 - 3As shown, when the multi-user GNSS simulation source signal closed-loop self-test system is used as a self-test calibration before the spacecraft is powered on, it is necessary to verify the absolute positioning functions of the six users and the relative positioning functions of their two-by-two combinations in turn. When verifying the absolute positioning function, each test scenario background is connected to one user respectively. It is necessary to check the six test scenario backgrounds to be monitored in the multi-user GNSS navigation simulation source list of the scenario management software, check the one user connected to each test scenario background, and click closed-loop self-test. Each user is a single user, and the single user is monitored. At this time, the microwave switches connected to the self-test signals output by the six single users will be set to the upward connection state, that is, connected to the first navigation receiver. The six simulation test scenario backgrounds run their corresponding scenario files in time-sharing, and the monitoring time is set to 2 minutes. The absolute positioning results will be displayed in real time in the simulator list of the multi-user GNSS navigation simulation source. When verifying the relative positioning function, each simulation test scenario background is connected to two users respectively. It is necessary to check the three simulation test scenario backgrounds to be monitored in the multi-user GNSS navigation simulation source list of the scenario management software, and click closed-loop self-test. The scenario management software will perform closed-loop detection on these three simulation test scenarios in turn. For each simulation test scenario background, the microwave switches connected to the corresponding two ground user self-test signals will be set to the upward connection and downward connection states, that is, the two users' self-test signals will be connected to the first navigation receiver and the second navigation receiver respectively. Run the scenario file, set the monitoring time to 2 minutes, and observe the relative positioning test results in the simulator list of the multi-user GNSS navigation simulation source. After the simulation test scenario is tested, the remaining two simulation test scenarios are closed-loop monitored. Since there are a total of 6 users, there are a total of 15 combinations after combining them in pairs. It is necessary to traverse all combinations to verify the correctness of the relative positioning function between the 6 users of the multi-user GNSS simulation source system, and eliminate hidden dangers for subsequent electrical measurements.

[0037] The present application provides a multi-user GNSS analog source signal closed-loop self-test method, based on the multi-user GNSS analog source signal closed-loop self-test system as described above, the method comprising: Step S1: Obtain a scenario file, and determine a simulation scenario and a simulation task identifier based on the scenario file; Step S2: triggering the multi-user GNSS simulated source signal closed-loop self-checking system to perform self-checking of the user's relative position or the user's absolute position based on the simulation scenario and the simulation task identifier.

[0038] The above specific embodiments only describe the design principles of this application. The shapes and names of the components in the description may be different and are not limited. Therefore, technicians in the field of this application can modify or replace the technical solutions recorded in the above embodiments; and these modifications and replacements do not deviate from the creative purpose and technical solutions of this application and should all fall within the scope of protection of this application.

Claims

1. A multi-user GNSS analog source signal closed-loop self-test system, characterized in that: include: A test computer for deploying scenario management software, with the test scenario backend corresponding to the test computer connected to one or more users; The scenario management software determines whether the simulation scenario is an absolute positioning scenario or a relative positioning scenario according to the number of users connected to the test scenario background; The multi-user GNSS signal simulation source generates GNSS frequency point radio frequency signals for each user corresponding to the simulation scenario according to the simulation scenario; A branch gain control submodule corresponding to each user is set in the branch control module, and the branch gain control submodule performs signal synthesis and power adjustment on the corresponding GNSS frequency radio frequency signal, and outputs a ground user self-test signal; The RF switch in the closed-loop detection module that corresponds one-to-one to the branch gain control submodule is used to conduct the ground user self-test signal; in the absolute positioning scenario, the RF switch is conducted in a unidirectional direction to the first combiner module or the second combiner module; in the relative positioning scenario, the RF switch is conducted in a bidirectional direction to the first combiner module and the second combiner module respectively; the first combiner module and / or the second combiner module respectively synthesize the ground user self-test signals they receive, and send the synthesized first synthesized signal and / or the second synthesized signal to the corresponding first navigation receiver and / or second navigation receiver in the receiver module respectively.

2. The system according to claim 1, characterized in that The users are orbits of different spacecraft. When one user is connected to the test scene background, the simulation scene is an absolute positioning scene; when two users are connected to the test scene background, the simulation scene is a relative positioning scene; in the relative positioning scene, the first navigation receiver and the second navigation receiver respectively receive the GNSS navigation simulation signals of the two users.

3. The system according to claim 2, characterized in that The formula for the split gain control submodule to synthesize and adjust the GNSS frequency RF signal is: In the formula, are input signals, represents the output signal, is a constant, For memory depth, are variables, represent P The kernel of the Volterra series model of a 1-order power amplifier, are the partial order coefficients respectively.

4. The system according to claim 3, characterized in that The output of the branch gain control submodule after processing the GNSS frequency radio frequency signal is one large signal and two small signals. One signal is selected from the one large signal and one small signal to be connected to the spacecraft GNSS navigation receiver, and the remaining one small signal is used as the ground user self-test signal corresponding to the branch gain control submodule; The ground user self-test signal expression is: In the formula, After the gain is The attenuator output signal, is the input signal, G is the gain value.

5. The system according to any one of claims 1 to 4, characterized in that: The scenario management software has the functions of operating and controlling the multi-user GNSS navigation simulation source, managing the test items and processes, processing and evaluating the test data, and outputting and storing the test results.

6. A multi-user GNSS analog source signal closed-loop self-test method, based on the multi-user GNSS analog source signal closed-loop self-test system as claimed in any one of claims 1 to 5, characterized in that: The method comprises: Step S1: Obtain a scenario file, and determine a simulation scenario and a simulation task identifier based on the scenario file; Step S2: triggering the multi-user GNSS simulated source signal closed-loop self-checking system to perform self-checking of the user's relative position or the user's absolute position based on the simulation scenario and the simulation task identifier.

7. A computer-readable storage medium, characterized in that: The storage medium stores a plurality of instructions; the plurality of instructions are used for the processor to load and execute the method as claimed in claim 6.

8. An electronic device, characterized in that: The electronic device comprises: A processor, which is used to execute multiple instructions; A memory for storing a plurality of instructions; Wherein, the multiple instructions are used to be stored by the memory, and loaded and executed by the processor as described in claim 6.

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