Test system for comparing anti-interference capabilities of multiple GNSS chips

Abstract

The application provides a test system for comparing anti-interference capabilities of multiple GNSS chips, and belongs to the technical field of anti-interference positioning. A control module controls a cellular signal generator to generate corresponding cellular interference signals and controls a GNSS signal generator to generate corresponding GNSS signals, so as to combine and inject the cellular interference signals and / or the GNSS signals into a test circuit board. The control module controls the test circuit board to sequentially turn on or selectively turn on at least one test branch, and injects the cellular interference signals and / or the GNSS signals into corresponding to-be-tested GNSS chips through the turned-on test branch. The control module is also used for collecting test results of each to-be-tested GNSS chip in real time, and comparing anti-interference capabilities of each to-be-tested GNSS chip according to the test results of each to-be-tested GNSS chip. The application can reduce the complexity of manual operation, enrich the test dimension, and improve the test efficiency and test accuracy of multiple GNSS chips.

Description

Technical Field

[0001] This application relates to the field of anti-interference positioning technology, and more specifically, to a test system for comparing the anti-interference capabilities of multiple GNSS chips. Background Technology

[0002] With the increasing trend of terminal devices supporting both cellular communication and Global Navigation Satellite System (GNSS) positioning, and the growing demand for miniaturization, GNSS systems are increasingly susceptible to interference from cellular communication systems. Therefore, testing the GNSS system's anti-interference capability against cellular communication systems has become an essential part of the product design process, especially during component selection and RF framework design phases, where it is crucial to compare the anti-interference capabilities of multiple GNSS chips or modules.

[0003] In related technologies, the anti-interference performance of GNSS systems is often measured in two ways. The first method is to use the fixed degradation measurement method, which involves injecting a cellular interference signal into the GNSS system under test and gradually increasing the power of the cellular interference signal until the carrier noise power density ratio of the GNSS system drops to a predetermined value (e.g., 3dB) compared to the interference-free state, and then recording the power of the cellular interference signal at this point. The second method is to use the fixed interference intensity measurement method, which involves measuring the real-time carrier noise power density ratio of multiple GNSS systems under the premise of setting the frequency band, modulation method, and transmission power of the cellular interference signal, and then making a horizontal comparison.

[0004] However, current measurement methods suffer from problems such as a large number of test combinations, huge workload, extremely long time consumption, and difficulty in meeting the requirements of high efficiency and high accuracy testing. Furthermore, the test dimension is singular and cannot characterize the full-process response characteristics of the GNSS chip's carrier noise power density ratio from slight deterioration to severe deterioration. Summary of the Invention

[0005] The purpose of this application is to provide a testing system for comparing the anti-interference capabilities of multiple GNSS chips, which can reduce the complexity of manual operation, enrich the testing dimensions, and improve the testing efficiency and accuracy of multiple GNSS chips.

[0006] The embodiments of this application are implemented as follows: A first aspect of this application provides a test system for comparing the anti-interference capabilities of multiple GNSS chips. The test system includes: a cellular signal generator, a GNSS signal generator, a test circuit board, and a control module. The test circuit board and the control module are both connected to multiple GNSS chips under test. The control module is connected to the cellular signal generator, the GNSS signal generator, and the test circuit board, respectively. The output terminals of the cellular signal generator and the GNSS signal generator are both connected to the input terminals of the test circuit board. The control module is used to control the cellular signal generator to generate corresponding cellular interference signals and inject the cellular interference signals into the test circuit board; the control module is also used to control the GNSS signal generator to generate corresponding GNSS signals and inject the GNSS signals into the test circuit board. The control module controls the test circuit board to sequentially or selectively turn on at least one test branch, and injects cellular interference signals and / or GNSS signals into the corresponding GNSS chip under test through the turned-on test branch; The control module is also used to collect the test results of each GNSS chip under test in real time, and to compare the anti-interference capabilities of each GNSS chip under test based on the test results.

[0007] As one possible implementation, the above-mentioned test system also includes: a first power divider; The first input terminal of the first power divider is connected to the output terminal of the cellular signal generator, and the second input terminal of the first power divider is connected to the output terminal of the GNSS signal generator. The output of the first power divider is connected to the input of the test circuit board; The first power divider is used to combine the cellular interference signal generated by the cellular signal generator and / or the GNSS signal generated by the GNSS signal generator and inject it into the test circuit board.

[0008] As one possible implementation, the aforementioned test circuit board includes: a second power divider, a first single-pole double-throw switch, a single-pole multi-throw switch, and a switch matrix; The control terminals of the first single-pole double-throw switch, the single-pole multi-throw switch, and the switch matrix are all connected to the control module. The input terminal of the first single-pole double-throw switch is connected to the output terminal of the first power divider. The first output terminal of the first single-pole double-throw switch is connected to the input terminal of the single-pole multi-throw switch. The second output terminal of the first single-pole double-throw switch is connected to the input terminal of the second power divider. One output terminal of the single-pole multi-throw switch is connected to one first input terminal of the switch matrix, one output terminal of the second power divider is connected to one second input terminal of the switch matrix, and one output terminal of the switch matrix is ​​connected to the input terminal of a GNSS chip under test.

[0009] As one possible implementation, the aforementioned switch matrix includes: multiple second single-pole double-throw switches, each of which corresponds one-to-one with a multiple GNSS chip under test; the first input terminal of each second single-pole double-throw switch is connected to one output terminal of a single-pole multi-throw switch; and the second input terminal of each second single-pole double-throw switch is connected to one output terminal of a second power divider.

[0010] As one possible implementation, the aforementioned control module is also used to control the cellular signal generator to stop working and control the GNSS signal generator to generate corresponding GNSS signals. At the same time, it controls the first single-pole double-throw switch to be turned on and the second power divider to be turned on, and controls the movable contacts of each second single-pole double-throw switch to switch to the second input terminal, so that the GNSS signals are injected in parallel into each GNSS chip under test, and determines the original carrier noise power density ratio of each GNSS chip under test based on the data collected from each GNSS chip under test.

[0011] As one possible implementation, the control module includes a graphical user interface, which obtains the target degradation value corresponding to each GNSS chip under test based on the configuration information input by the user in the graphical user interface.

[0012] As one possible implementation, the process by which the control module controls the test circuit board to conduct sequentially includes: The system controls the cellular signal generator to generate a changing cellular interference signal and controls the GNSS signal generator to generate a fixed GNSS signal. It also controls the first single-pole double-throw switch and the single-pole multi-throw switch to be turned on, and controls the single-pole multi-throw switch to be turned on with the first input terminal of a second single-pole double-throw switch in a switch matrix, so that the cellular interference signal and the GNSS signal are injected into a target GNSS chip under test in sequence. The system controls the cellular signal generator to generate a fixed cellular interference signal and the GNSS signal generator to generate a fixed GNSS signal. It also controls the first single-pole double-throw switch to be turned on and the second power divider to be turned on. The system further controls the second power divider to be turned on and the second input terminals of all the second single-pole double-throw switches in the switch matrix, so that the cellular interference signal and the GNSS signal are injected into all the GNSS chips under test in parallel.

[0013] As one possible implementation, the process by which the control module selectively controls the test circuit board to conduct includes: The system controls the cellular signal generator to generate a changing cellular interference signal and controls the GNSS signal generator to generate a fixed GNSS signal. It also controls the first single-pole double-throw switch and the single-pole multi-throw switch to be turned on, and controls the single-pole multi-throw switch to be turned on with the first input terminal of a second single-pole double-throw switch in a switch matrix, so that the cellular interference signal and the GNSS signal are injected into a target GNSS chip under test in sequence. Alternatively, the cellular signal generator can be controlled to generate a fixed cellular interference signal, and the GNSS signal generator can be controlled to generate a fixed GNSS signal. The first single-pole double-throw switch and the second power divider can be turned on, and the second power divider can be turned on to the second input terminal of all the second single-pole double-throw switches in the switch matrix, so that the cellular interference signal and the GNSS signal are injected into all the GNSS chips under test in parallel.

[0014] As one possible implementation, the above test results include: the decrease in the power of the cellular interference signal and / or the carrier noise power density ratio. The control module is also used to acquire the test results of each GNSS chip under test in real time, and to compare the anti-interference capabilities of each GNSS chip under test based on the test results, including: When the original carrier noise power density ratio of the target GNSS chip under test decreases by the target degradation value, record the power of the cellular interference signal corresponding to the decreased carrier noise power density ratio, until the power of the cellular interference signal corresponding to the decreased carrier noise power density ratio of the last GNSS chip under test is recorded. And / or, record the decrease in the real-time carrier noise power density ratio of each GNSS chip under test compared to the original carrier noise power density ratio; The power of the cellular interference signal corresponding to the same target degradation value decrease in the original carrier noise power density ratio of each GNSS chip under test is compared, and / or the decrease magnitude of the real-time carrier noise power density ratio of each GNSS chip under test is compared to determine the anti-interference capability comparison result of each GNSS chip under test.

[0015] As one possible implementation, the control module is also used to send a cold start command to each GNSS chip under test before sequential or parallel testing, so as to trigger each GNSS chip under test to enter the cold start mode and ensure that all tests of each GNSS chip under test are performed in the same initial working state.

[0016] The beneficial effects of the embodiments of this application include: This application provides a testing system for comparing the anti-interference capabilities of multiple GNSS chips. A control module controls the start and stop of a cellular signal generator and a GNSS signal generator, as well as controls the cellular signal generator to generate corresponding cellular interference signals and the GNSS signal generator to generate corresponding GNSS signals. The generated cellular interference signals and / or GNSS signals are then merged and injected into a test circuit board. The control module controls the test circuit board to sequentially or selectively activate at least one test branch, and injects the cellular interference signals and / or GNSS signals into the corresponding GNSS chip under test via the activated test branch. The system collects the test results of each GNSS chip under test in real time and compares these results to determine the anti-interference capabilities of the multiple GNSS chips under test. The control module achieves fully automated control of the signal source, test path, and data acquisition, enabling efficient testing of the anti-interference capabilities of multiple GNSS chips under test under various cellular interference conditions and automatically generating comparative analysis results. Furthermore, the GNSS signal generator is compatible with various types of satellite navigation systems and can simulate GNSS signals transmitted by different satellite navigation systems at different frequency bands. In this way, the complexity of manual operation can be reduced, the test dimensions can be enriched, and the test efficiency and accuracy of multiple GNSS chips can be improved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of a first test system for comparing the anti-interference capabilities of multiple GNSS chips, provided in an embodiment of this application; Figure 2 A schematic diagram of the structure of a second test system for comparing the anti-interference capabilities of multiple GNSS chips, provided in an embodiment of this application; Figure 3 A schematic diagram of the structure of a third type of test system for comparing the anti-interference capabilities of multiple GNSS chips, provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a fourth test system for comparing the anti-interference capabilities of multiple GNSS chips, provided in an embodiment of this application.

[0019] Reference numerals: 10: Test system; 101: Cellular signal generator; 102: GNSS signal generator; 103: Test circuit board; 1031: Second power divider; 1032: First single-pole double-throw switch; 1033: Single-pole multi-throw switch; 1034: Switch matrix; 341: Second single-pole double-throw switch; 104: Control module; 1041: Graphical user interface; 105: First power divider; 20: GNSS chip under test. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this application, it should be noted that the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Currently, the anti-interference performance of GNSS systems is often measured in two ways. The first method is the fixed degradation measurement method, which involves injecting a cellular interference signal into the GNSS system under test and gradually increasing the power of the cellular interference signal until the carrier noise power density ratio of the GNSS system drops to a predetermined value (e.g., 3dB) compared to the interference-free state. The power of the cellular interference signal at this point is recorded. The second method is the fixed interference intensity measurement method, which involves measuring the real-time carrier noise power density ratio of multiple GNSS systems under the premise of setting the frequency band, modulation method, and transmission power of the cellular interference signal, and then making a horizontal comparison.

[0025] However, current GNSS chips typically need to support multiple satellite navigation systems and multiple frequency bands simultaneously. If existing testing methods are used to compare the anti-interference capabilities of multiple GNSS chips, it would require testing the impact of each cellular communication system on different GNSS frequency bands and different GNSS chips individually. This results in a massive number of test combinations, an enormous workload, and an extremely long testing time, making it difficult to meet the demands for high-efficiency and high-precision testing. Furthermore, existing testing methods have a single testing dimension, focusing only on the anti-interference capability of a GNSS chip when its carrier noise power density ratio drops to a specific empirical threshold. This fails to characterize the entire response characteristics of a GNSS chip as its carrier noise power density ratio deteriorates from slightly to severely.

[0026] To address this, this application provides a testing system for comparing the anti-interference capabilities of multiple GNSS chips. A control module controls the start and stop of a cellular signal generator and a GNSS signal generator, as well as controls the cellular signal generator to generate corresponding cellular interference signals and the GNSS signal generator to generate corresponding GNSS signals. The generated cellular interference signals and / or GNSS signals are then merged and injected into a test circuit board. The control module controls the test circuit board to sequentially or selectively activate at least one test branch, and injects the cellular interference signals and / or GNSS signals into the corresponding GNSS chip under test via the activated test branch. The test results of each GNSS chip under test are collected in real time and compared to determine the anti-interference capabilities of the multiple GNSS chips. This approach reduces the complexity of manual operation, enriches the testing dimensions, and improves the testing efficiency and accuracy of multiple GNSS chips.

[0027] The following description, in conjunction with the accompanying drawings, provides a detailed explanation of the test system for comparing the anti-interference capabilities of multiple GNSS chips provided in the embodiments of this application.

[0028] Figure 1 A flowchart of a test system for comparing the anti-interference capabilities of multiple GNSS chips provided in this application is available in [reference]. Figure 1 This application provides a test system 10 for comparing the anti-interference capabilities of multiple GNSS chips, including: a cellular signal generator 101, a GNSS signal generator 102, a test circuit board 103, and a control module 104.

[0029] The test circuit board 103 and the control module 104 are both connected to multiple GNSS chips 20 under test. The control module 104 is connected to the cellular signal generator 101, the GNSS signal generator 102 and the test circuit board 103 respectively. The output terminals of the cellular signal generator 101 and the GNSS signal generator 102 are both connected to the input terminal of the test circuit board 103.

[0030] Specifically, the control module 104 can be implemented by a microcontroller, controller, control chip, software control tools, etc., and this application does not make specific limitations in this regard.

[0031] Optionally, the GNSS chip 20 to be tested can be a positioning module deployed in a terminal product or a newly manufactured printed circuit board; this application does not make any specific limitations on this.

[0032] Optionally, the cellular signal generator 101 is a signal generator that simulates cellular interference signals generated by a cellular communication system, and the GNSS signal generator 102 is a signal generator that simulates global navigation satellite signals from multiple satellite navigation systems and multiple frequency bands.

[0033] Optionally, the test circuit board 103 can be controlled by the control module 104 to turn on at least one test branch to inject the cellular interference signal generated by the cellular signal generator 101 and / or the GNSS signal generated by the GNSS signal generator 102 into the GNSS chip under test 20, thereby realizing the anti-interference performance test of the GNSS chip under test 20.

[0034] The control module 104 is used to control the cellular signal generator 101 to generate corresponding cellular interference signals and inject the cellular interference signals into the test circuit board 103; the control module 104 is also used to control the GNSS signal generator 102 to generate corresponding GNSS signals and inject the GNSS signals into the test circuit board 103.

[0035] Optionally, the control module 104 can control the cellular signal generator 101 to generate cellular interference signals with variable power in the same frequency band and the same modulation method, or control the cellular signal generator 101 to generate cellular interference signals with specific power in the same frequency band and the same modulation method, or control the cellular signal generator 101 to generate cellular interference signals in different frequency bands. The specific control module 104 determines the test branch currently selected by the control module 104, and this application does not impose any specific limitations on this.

[0036] It should be noted that cellular interference signals refer to unintended radio frequency signals transmitted by the cellular signal generator 101 under the control of the control module 104 that enter the front end of the GNSS chip 20 under test. Cellular interference signals cause a decrease in the carrier-to-noise power density ratio of the GNSS chip 20 under test through front-end saturation, harmonic / intermodulation regions, and noise floor elevation, thereby causing signal loss or positioning interruption of the GNSS chip 20 under test.

[0037] Optionally, the control module 104 can control the GNSS signal generator 102 to generate GNSS signals emitted by different global navigation and positioning systems, and can also control the GNSS signal generator 102 to generate GNSS signals of the same global navigation and positioning system in different frequency bands (such as frequency band L1, frequency band L2, frequency band L3, frequency band L4, etc.). The specific frequency band L1 is determined by the test branch currently selected by the control module, and this application does not make any specific limitations on this.

[0038] It should also be noted that the GNSS signal generator is compatible with multiple global navigation and positioning systems and multiple global navigation and positioning systems of different frequency bands. These multiple global navigation and positioning systems specifically include: BeiDou Navigation Satellite System (BDS), Global Positioning System (GPS), GLONASS, and Galileo Navigation Satellite System, etc. This application does not make any specific limitations on these systems.

[0039] It is worth noting that the cellular interference signal generated by the cellular signal generator 101 and the GNSS signal generated by the GNSS signal generator 102 are specifically determined by the control parameters sent by the control module 104 to the cellular signal generator 101 and the GNSS signal generator 102, and this application does not make specific limitations on this.

[0040] Specifically, the control module 104 sends control parameters to the cellular signal generator 101 according to a preset test plan to control it to generate corresponding cellular interference signals. The control parameters sent by the control module 104 to the cellular signal generator 101 include, but are not limited to, setting the carrier frequency, output power, modulation method, signal bandwidth, and operating frequency band of the cellular interference signal.

[0041] Simultaneously, the control module 104 sends control parameters to the GNSS signal generator 102 to control it to generate the corresponding GNSS signal. These control parameters include, but are not limited to, setting the satellite navigation system type (such as at least one of BDS, GPS, GLONASS, and Galileo), operating frequency band (such as at least one of L1, L2, L5, and L6), signal power, number of simulated satellites, and ephemeris parameters.

[0042] Furthermore, the control module 104 controls the cellular signal generator 101 and the GNSS signal generator 102 to inject the generated signals into the test circuit board 103, either separately or simultaneously.

[0043] The control module 104 controls the test circuit board 103 to sequentially or selectively turn on at least one test branch, and injects cellular interference signals and / or GNSS signals into the corresponding GNSS chip 20 under test through the turned-on test branch.

[0044] Optionally, the control module 104 is connected to the test circuit board 103 and can flexibly switch the current test path of the test circuit board 103 by controlling the switch network inside the test circuit board 103.

[0045] Specifically, the control module 104 controls the test circuit board 103 to sequentially or selectively activate at least one test branch, and injects the cellular interference signal generated by the cellular signal generator 101 and / or the GNSS signal generated by the GNSS signal generator 102 into the corresponding GNSS chip 20 under test via the activated test branch. Sequential activation means that the control module 104 activates each test branch one by one according to a preset order to execute the first test mode (e.g., first execute the serial test mode, then execute the parallel test mode); selective activation means that the control module 104 selects to activate a portion of the test branches according to user instructions or preset conditions to execute the second test mode (e.g., only execute the serial test mode, or only execute the parallel test mode).

[0046] The control module 104 is also used to collect the test results of each GNSS chip 20 under test in real time, and to compare the anti-interference capabilities of each GNSS chip 20 under test based on the test results.

[0047] Optionally, the test results include, but are not limited to, parameters such as the original carrier noise power density ratio of each GNSS chip 20 under interference-free conditions, the real-time carrier noise power density ratio under cellular interference conditions, the magnitude of the decrease in carrier noise power density ratio, and the power of the cellular interference signal corresponding to the decrease in the original carrier noise power density ratio to the user-specified target degradation value.

[0048] It is worth noting that the control module 104 can obtain the test results of each GNSS chip 20 by establishing a communication interface with the GNSS chip 20 under test or the test board carrying the GNSS chip 20 under test.

[0049] Optionally, the control module 104 compares the anti-interference capabilities of each GNSS chip 20 under test based on the test results. Specific comparison methods include, but are not limited to: comparing the decrease in the original carrier noise power density ratio of different GNSS chips 20 under test under the same cellular interference conditions; the smaller the decrease, the stronger the anti-interference capability of the GNSS chip 20 under test; and comparing the power of the cellular interference signal required for the original carrier noise power density ratio of different GNSS chips 20 to decrease to the same target degradation value (e.g., 3dB, 6dB, 9dB, etc.) under the condition that the original carrier noise power density ratio decreases by the same target degradation value; the greater the required power, the stronger the anti-interference capability of the GNSS chip under test.

[0050] Furthermore, the control module 104 is also used to automatically generate data tables and / or charts based on the test data collected from each GNSS chip 20 under test and the test circuit board 103, so as to intuitively display the anti-interference performance comparison results of each GNSS chip 20 under test under different test conditions, for users to refer to for device selection or RF design optimization.

[0051] In this embodiment, a control module controls the start and stop of the cellular signal generator and the GNSS signal generator, as well as controls the cellular signal generator to generate corresponding cellular interference signals and the GNSS signal generator to generate corresponding GNSS signals. The generated cellular interference signals and / or GNSS signals are then merged and injected into the test circuit board. The control module controls the test circuit board to sequentially or selectively activate at least one test branch, and injects the cellular interference signals and / or GNSS signals into the corresponding GNSS chip under test via the activated test branch. The test results of each GNSS chip under test are collected in real time and compared to determine the anti-interference capability of multiple GNSS chips under test. The control module achieves fully automated control of the signal source, test path, and data acquisition, enabling efficient testing of the anti-interference capability of multiple GNSS chips under test under various cellular interference conditions and automatically generating comparative analysis results. Furthermore, the GNSS signal generator is compatible with various types of satellite navigation systems and can simulate GNSS signals transmitted by various satellite navigation systems at different frequency bands. In this way, the complexity of manual operation can be reduced, the test dimensions can be enriched, and the test efficiency and accuracy of multiple GNSS chips can be improved.

[0052] In one alternative implementation, see [link to implementation details]. Figure 2 The test system 10 for comparing the anti-interference capabilities of multiple GNSS chips provided in this application embodiment also includes: a first power divider 105.

[0053] The first input terminal of the first power divider 105 is connected to the output terminal of the cellular signal generator 101, and the second input terminal of the first power divider 105 is connected to the output terminal of the GNSS signal generator 102. The output terminal of the first power divider 105 is connected to the input terminal of the test circuit board 103; The first power divider 105 is used to combine the cellular interference signal generated by the cellular signal generator 101 and / or the GNSS signal generated by the GNSS signal generator 102 and inject it into the test circuit board 103.

[0054] Optionally, the first input terminal of the first power divider 105 is connected to the output terminal of the cellular signal generator 101 to receive the cellular interference signal generated by the cellular signal generator 101; the second input terminal of the first power divider 105 is connected to the output terminal of the GNSS signal generator 102 to receive the GNSS signal generated by the GNSS signal generator 102.

[0055] Optionally, the output terminal of the first power divider 105 is connected to the input terminal of the test circuit board 103 to perform combined processing on the cellular interference signal generated by the cellular signal generator 101 and / or the GNSS signal generated by the GNSS signal generator 102, and then inject the combined signals into the test circuit board 103.

[0056] It should be noted that the first power divider 105 can be used as a combiner in the signal flow, that is, to combine two input signals into one output signal; or it can transmit one signal separately (such as only transmitting cellular interference signals or only transmitting GNSS signals) according to actual test requirements, while leaving the other input terminal empty or connected to a matching load.

[0057] It should also be noted that the first power divider 105 can effectively merge the cellular interference signal and the GNSS signal before they enter the test circuit board 103, thereby simplifying the signal wiring structure at the front end of the test circuit board 103, avoiding the additional path loss and signal inconsistency problems introduced by the separate access of the two signals, and ensuring the signal consistency injected into each GNSS chip 20 under test and the accuracy of the test results.

[0058] It is worth noting that the operating frequency range of the first power divider 105 should cover the output frequency bands of the cellular signal generator 101 and the GNSS signal generator 102 to ensure that the amplitude flatness and phase consistency of the signal during the combining process meet the test accuracy requirements.

[0059] In one alternative implementation, see [link to implementation details]. Figure 3The test circuit board 103 in the test system 10 for comparing the anti-interference capabilities of multiple GNSS chips provided in this application embodiment includes: a second power divider 1031, a first single-pole double-throw switch 1032, a single-pole multi-throw switch 1033, and a switch matrix 1034.

[0060] The control terminals of the first single-pole double-throw switch 1032, the single-pole multi-throw switch 1033, and the switch matrix 1034 are all connected to the control module 104. The input terminal of the first single-pole double-throw switch 1032 is connected to the output terminal of the first power divider 105. The first output terminal of the first single-pole double-throw switch 1032 is connected to the input terminal of the single-pole multi-throw switch 1033. The second output terminal of the first single-pole double-throw switch 1032 is connected to the input terminal of the second power divider 1031. One output terminal of the single-pole multi-throw switch 1033 is connected to a first input terminal of the switch matrix 1034, one output terminal of the second power divider 1031 is connected to a second input terminal of the switch matrix 1034, and one output terminal of the switch matrix 1034 is connected to an input terminal of a GNSS chip 20 under test.

[0061] Optionally, the control module 104 can send control commands to the first single-pole double-throw switch 1032, the single-pole multi-throw switch 1033, and the switch matrix 1034 through the control terminals of the first single-pole double-throw switch 1032, the single-pole multi-throw switch 1033, and the switch matrix 1034, respectively, to independently control the conduction state of the first single-pole double-throw switch 1032, the single-pole multi-throw switch 1033, and the switch matrix 1034, thereby realizing flexible switching of the test branch.

[0062] Optionally, the input terminal of the first single-pole double-throw switch 1032 is connected to the output terminal of the first power divider 105 to receive cellular interference signals and / or GNSS signals after being combined by the first power divider 105.

[0063] Optionally, the first output terminal of the first single-pole double-throw switch 1032 is connected to the input terminal of the single-pole multi-throw switch 1033, and the second output terminal of the first single-pole double-throw switch 1032 is connected to the input terminal of the second power divider 1031. The control module 104 can select to route the combined cellular interference signal and / or GNSS signal to the serial test path where the single-pole multi-throw switch 1033 is located, or to the parallel test path where the second power divider 1031 is located, by controlling the switching of the first single-pole double-throw switch 1032.

[0064] Optionally, under the control of the control module 104, the switch matrix 1034 can selectively conduct serial test signals from the single-pole multi-throw switch 1033 or parallel test signals from the second power divider 1031 to the corresponding GNSS chip 20 under test.

[0065] Optionally, if the control module 104 is currently executing the serial test mode, the control module 104 controls the movable contact of the first single-pole double-throw switch 1032 to switch to the first output terminal, so that the combined cellular interference signal and / or GNSS signal is output through the single-pole multi-throw switch 1033; at the same time, the control module 104 controls the movable contact of the single-pole multi-throw switch 1033 to be turned on sequentially to one output terminal of the single-pole multi-throw switch 1033, and simultaneously controls the first input terminal of the switch matrix 1034 connected to the currently turned-on output terminal to be turned on, thereby realizing the testing of each GNSS chip 20 under test.

[0066] Optionally, if the control module 104 is currently executing the parallel test mode, the control module 104 controls the movable contact of the first single-pole double-throw switch 1032 to switch to its second output terminal, and controls the movable contacts of the switch matrix 1034 to switch to the second input terminal, so that the combined cellular interference signal and / or GNSS signal are distributed to the second input terminal of the switch matrix 1034 through the second power divider 1031, thereby realizing the simultaneous testing of all GNSS chips 20 under test.

[0067] In one alternative implementation, see [link to implementation details]. Figure 3 The switch matrix 1034 in the test system 10 for comparing the anti-interference capabilities of multiple GNSS chips provided in this application embodiment includes: multiple second single-pole double-throw switches 341, each of which corresponds to a multiple GNSS chip 20 under test. The first input terminal of each second single-pole double-throw switch 341 is connected to one output terminal of a single-pole multi-throw switch 1033, and the second input terminal of each second single-pole double-throw switch 341 is connected to one output terminal of a second power divider 1031.

[0068] Optionally, multiple output terminals of the single-pole multiple-throw switch 1033 are respectively connected to the first input terminals of each second single-pole double-throw switch 341, for transmitting the serial test signal from the single-pole multiple-throw switch 1033 to the corresponding second single-pole double-throw switch 341 in serial test mode. The serial test signal refers to the combined cellular interference signal and GNSS signal input to the first power divider 105.

[0069] Optionally, multiple output terminals of the second power divider 1031 are respectively connected to the second input terminals of each second single-pole double-throw switch 341, for distributing the parallel test signal from the second power divider 1031 to each second single-pole double-throw switch 341 in parallel test mode. The parallel test signal refers to the combined cellular interference signal and GNSS signal input to the first power divider 105.

[0070] Optionally, the output terminal of each second single-pole double-throw switch 341 is connected to the input terminal of the corresponding GNSS chip 20 under test, so as to inject the selected serial test signal or parallel test signal into the corresponding GNSS chip 20 under test.

[0071] Optionally, the control module 104 can independently control the conduction state of each second single-pole double-throw switch 341 by sending control commands to the control terminals of each second single-pole double-throw switch 341, thereby selecting to connect the first input terminal of each second single-pole double-throw switch 341 to the output terminal (i.e., select a serial test signal) or to connect the second input terminal of each second single-pole double-throw switch 341 to the output terminal (i.e., select a parallel test signal).

[0072] Specifically, when a serial test is required, the control module 104 controls the movable contact of the second single-pole double-throw switch 341 corresponding to the GNSS chip 20 under test to switch to its first input terminal, and at the same time controls other second single-pole double-throw switches 341 to be in the off state.

[0073] Furthermore, when parallel testing is required, the control module 104 controls all movable contacts of the second single-pole double-throw switch 341 to switch to their second input terminals simultaneously, so as to achieve simultaneous testing of all GNSS chips 20 under test.

[0074] In an optional implementation, before performing anti-interference performance testing on multiple GNSS chips, the control module 104 of the test system 10 provided in this application for comparing the anti-interference capabilities of multiple GNSS chips is further configured to: The cellular signal generator 101 is controlled to stop working, and the GNSS signal generator 102 is controlled to generate the corresponding GNSS signal. At the same time, the first single-pole double-throw switch 1032 and the second power divider 1031 are controlled to be turned on, and the movable contacts of each second single-pole double-throw switch 341 are controlled to switch to the second input terminal, so that the GNSS signal is injected in parallel into each GNSS chip 20 under test, and the original carrier noise power density ratio of each GNSS chip 20 under test is determined based on the data collected from each GNSS chip 20 under test.

[0075] Optionally, the control module 104 controls the cellular signal generator 101 to stop working to ensure that there are no cellular interference signals during the test, thereby obtaining the baseline performance parameters of the GNSS chip 20 under interference-free environment. Simultaneously, the control module 104 controls the GNSS signal generator 102 to generate corresponding GNSS signals. These GNSS signals include, but are not limited to, at least one signal from the L1, L2, L5, and L6 frequency bands of at least one satellite navigation system, such as the BeiDou Navigation Satellite System, the Global Positioning System, the GLONASS Navigation Satellite System, and the Galileo Navigation Satellite System. The signal power, number of simulated satellites, and ephemeris parameters output by the GNSS signal generator 102 are configured by the control module 104 according to a preset test plan.

[0076] Optionally, the control module 104 controls the movable contact of the first single-pole double-throw switch 1032 to switch to the second output terminal of the first single-pole double-throw switch 1032, so that the first single-pole double-throw switch 1032 is connected to the second power divider 1031. This allows the GNSS signal input from the GNSS signal generator 102 to the first power divider 105 to be transmitted to the second power divider 1031 via the first single-pole double-throw switch 1032, and then the second power divider 1031 distributes the input GNSS signal into multiple outputs. Simultaneously, the control module 104 controls the movable contact of each second single-pole double-throw switch 341 in the switch matrix 1034 to switch to the second input terminal of each second single-pole double-throw switch 341, so that the multiple GNSS signals after being split by the second power divider 1031 are injected in parallel into all the GNSS chips 20 under test.

[0077] Furthermore, all GNSS chips under test 20 simultaneously receive the same GNSS signal and are all in an environment free from cellular interference. The control module 104 collects the test data reported by each GNSS chip under test 20 in real time through the communication interface of each GNSS chip under test 20 to determine the original carrier noise power density ratio of each GNSS chip under test 20. The test data includes the carrier noise power density ratio value generated by each GNSS chip under test 20 after processing the currently received GNSS signal.

[0078] It is worth noting that since the GNSS signal strength output by the GNSS signal generator 102 is known and stable, the carrier noise power density ratio reported by each GNSS chip under test 20 under the condition of no cellular interference is the original carrier noise power density ratio of each GNSS chip under test 20 under the condition of no interference.

[0079] Optionally, the control module 104 records and stores the original carrier noise power density ratio of each GNSS chip 20 under test, as benchmark data for subsequent anti-interference capability comparison tests.

[0080] In one alternative implementation, see [link to implementation details]. Figure 4 The control module 104 in the test system 10 for comparing the anti-interference capabilities of multiple GNSS chips provided in this application embodiment includes: a graphical user interface 1041. The control module 104 obtains the target degradation value corresponding to each GNSS chip 20 under test according to the configuration information input by the user in the graphical user interface 1041.

[0081] Optionally, the control module 104 obtains the target degradation value corresponding to each GNSS chip 20 under test based on the configuration information input by the user in the graphical user interface 1041. The target degradation value refers to the decrease in carrier noise power density ratio set by the user for the anti-interference test of the GNSS chip under test. The target degradation value can be 3dB, 6dB, 9dB, 12dB, 15dB, etc., or other user-defined values ​​such as 2dB, 5dB, 9dB, 13dB, etc. This application does not specifically limit this value.

[0082] Optionally, the graphical user interface 1041 can provide users with a visual parameter configuration window, where users can input or select target degradation values ​​via input devices such as a keyboard, mouse, or touchscreen. It is worth noting that users can set a uniform target degradation value for all GNSS chips 20 under test according to different testing requirements, or they can set different target degradation values ​​for different GNSS chips 20 under test, different GNSS frequency bands, or different satellite navigation systems to meet diverse testing scenarios and evaluation standards.

[0083] Optionally, after receiving the configuration information input by the user in the graphical user interface 1041, the control module 104 parses and stores it as test parameters.

[0084] Specifically, when executing the serial test mode, the control module 104 reads the target degradation value and dynamically adjusts the cellular interference signal generated by the cellular signal generator 101 accordingly until the real-time carrier noise power density ratio of the currently active GNSS chip 20 under test drops to the level of the original carrier noise power density ratio minus the target degradation value. Then, the power of the cellular interference signal generated by the cellular signal generator 101 is recorded as the anti-interference capability characterization value of the GNSS chip 20 under test at the target degradation value.

[0085] In one optional implementation, the process by which the control module 104 of the test system 10 for comparing the anti-interference capabilities of multiple GNSS chips, as provided in this application embodiment, controls the test circuit board 103 to be turned on sequentially includes: The cellular signal generator 101 is controlled to generate a changing cellular interference signal, and the GNSS signal generator 102 is controlled to generate a fixed GNSS signal. The first single-pole double-throw switch 1032 and the single-pole multi-throw switch 1033 are turned on, and the single-pole multi-throw switch 1033 is turned on to the first input terminal of a second single-pole double-throw switch 341 in the switch matrix 1034, so that the cellular interference signal and the GNSS signal are injected into a target GNSS chip 20 under test in sequence. The cellular signal generator 101 is controlled to generate a fixed cellular interference signal, and the GNSS signal generator 102 is controlled to generate a fixed GNSS signal. The first single-pole double-throw switch 1032 is controlled to be turned on and the second power divider 1031 is controlled to be turned on and the second input terminal of all the second single-pole double-throw switches 341 in the switch matrix 1034 is turned on, so that the cellular interference signal and the GNSS signal are injected into all the GNSS chips 20 under test in parallel.

[0086] Among them, the changing cellular interference signal refers to the output power of the cellular signal generator 101 gradually increasing or decreasing according to a preset step value (such as 0.5dB, 1dB, etc.) in order to search for the critical interference power required to reach the target degradation value during the test; the fixed cellular interference signal refers to the output power, frequency band, modulation method and other parameters of the cellular signal generator 101 being kept constant, so as to compare the performance differences of each GNSS chip 20 under test under the same interference conditions; the fixed GNSS signal refers to the output power, frequency band, number of simulated satellites and other parameters of the GNSS signal generator 102 being kept constant, so as to ensure that the test benchmark of each GNSS chip under test is consistent.

[0087] Specifically, the control module 104 first controls the cellular signal generator 101 to generate a changing cellular interference signal, and controls the GNSS signal generator 102 to generate a fixed GNSS signal. Simultaneously, the control module 104 controls the movable contact of the first single-pole double-throw switch 1032 to switch to the first output terminal, so that the first single-pole double-throw switch 1032 is connected to the single-pole multi-throw switch 1033. It then controls the movable contact of the single-pole multi-throw switch 1033 to sequentially switch to one of its output terminals, so that each output terminal of the single-pole multi-throw switch 1033 is sequentially connected to each of the second single-pole double-throw switches 341 in the switch matrix 1034. Finally, it sequentially controls the movable contact of each second single-pole double-throw switch 341 to sequentially switch to the first input terminal of each second single-pole double-throw switch 341. Specifically, the control module 104 sequentially switches the output of the single-pole multi-throw switch 1033 to the port connected to the first input of the second single-pole double-throw switch 341 corresponding to the current target GNSS chip 20 under test, according to a preset sequence. This allows the combined cellular interference signal and GNSS signal to be injected into a target GNSS chip 20 under test in sequence, thereby realizing the serial testing of each GNSS chip 20 under test.

[0088] It should be noted that during the aforementioned serial testing process, the control module 104 acquires the carrier noise power density ratio of the target GNSS chip 20 under test in real time, and dynamically adjusts the power of the cellular interference signal generated by the cellular signal generator 101 according to the preset target degradation value, until the real-time carrier noise power density ratio of the target GNSS chip 20 under test decreases by the target degradation value compared to the original carrier noise power density, at which point the power of the cellular interference signal at the current moment is recorded. After completing the test of one target GNSS chip 20 under test, the control module 104 controls the single-pole multi-throw switch 1033 to switch to the next output port to continue testing the next GNSS chip 20 under test, until all GNSS chips 20 under test have been tested.

[0089] Furthermore, after the serial test is completed, the control module 104 continues to control the cellular signal generator 101 to generate a fixed cellular interference signal and controls the GNSS signal generator 102 to generate a fixed GNSS signal. Simultaneously, the control module 104 controls the movable contact of the first single-pole double-throw switch 1032 to switch to the second output terminal, so that the first single-pole double-throw switch 1032 is connected to the second power divider 1031. It also controls the movable contacts of all second single-pole double-throw switches 341 in the switch matrix 1034 to switch to the second input terminal of each second single-pole double-throw switch 341, so that the second power divider 1031 and the second input terminals of all second single-pole double-throw switches 341 are simultaneously connected. The combined cellular interference signal and GNSS signal are distributed into multiple paths by the second power divider 1031 and injected in parallel into all the GNSS chips 20 under test, achieving parallel testing of all the GNSS chips 20 under test.

[0090] It should also be noted that during the parallel testing process, the control module 104 simultaneously collects the carrier noise power density ratio of all the GNSS chips 20 under test, and records the decrease in the carrier noise power density ratio of each GNSS chip under test under the current fixed interference conditions, so as to intuitively compare the differences in anti-interference capabilities of different GNSS chips under test under the same interference environment.

[0091] In one optional implementation, the process by which the control module 104 in the test system 10 for comparing the anti-interference capabilities of multiple GNSS chips, as provided in this application embodiment, controls the test circuit board 103 to selectively conduct includes: The cellular signal generator 101 is controlled to generate a changing cellular interference signal, and the GNSS signal generator 102 is controlled to generate a fixed GNSS signal. The first single-pole double-throw switch 1032 and the single-pole multi-throw switch 1033 are turned on, and the single-pole multi-throw switch 1033 is turned on to the first input terminal of a second single-pole double-throw switch 341 in the switch matrix 1034, so that the cellular interference signal and the GNSS signal are injected into a target GNSS chip 20 under test in sequence. Alternatively, the cellular signal generator 101 is controlled to generate a fixed cellular interference signal, and the GNSS signal generator 102 is controlled to generate a fixed GNSS signal. The first single-pole double-throw switch 1032 is controlled to be turned on with the second power divider 1031, and the second power divider 1031 is controlled to be turned on with the second input terminal of all the second single-pole double-throw switches 341 in the switch matrix 1034, so that the cellular interference signal and the GNSS signal are injected into all the GNSS chips 20 under test in parallel.

[0092] Optionally, when the control module 104 controls the test circuit board 103 to selectively conduct, the test circuit board 103 only executes either the serial test mode or the parallel test mode. The specific implementation process is the same as described above, and will not be repeated here.

[0093] In one optional implementation, the test results include: the decrease in the power of the cellular interference signal and / or the carrier noise power density ratio. The control module 104 is further configured to collect the test results of each GNSS chip 20 under test in real time, and compare the anti-interference capabilities of each GNSS chip 20 under test based on the test results, including: When the original carrier noise power density ratio of the target GNSS chip 20 decreases by the target degradation value, the power of the cellular interference signal corresponding to the decreased carrier noise power density ratio is recorded until the power of the cellular interference signal corresponding to the decreased carrier noise power density ratio of the last GNSS chip 20 under test is recorded.

[0094] Optionally, in the serial test mode, when the real-time carrier noise power density ratio of the target GNSS chip 20 under test decreases by a target degradation value compared to the original carrier noise power density ratio, the control module 104 records the power of the cellular interference signal corresponding to the decreased carrier noise power density ratio, and repeats the above process until the power of the cellular interference signal corresponding to the decreased carrier noise power density ratio of the last GNSS chip 20 under test is recorded, so as to obtain the critical interference power threshold of each GNSS chip 20 under test under the same carrier noise power density ratio degradation condition.

[0095] And / or, record the decrease in the real-time carrier noise power density ratio of each GNSS chip 20 under test compared to the original carrier noise power density ratio.

[0096] Optionally, in parallel test mode, the control module 104 records the decrease in the real-time carrier noise power density ratio of each GNSS chip 20 under test compared to the original carrier noise power density ratio, so as to obtain the degree of performance degradation of each GNSS chip 20 under test under the same interference intensity.

[0097] The power of the cellular interference signal corresponding to the same target degradation value decrease in the original carrier noise power density ratio of each GNSS chip 20 under test is compared, and / or the decrease amplitude of the real-time carrier noise power density ratio of each GNSS chip 20 under test is compared to determine the anti-interference capability comparison result of each GNSS chip 20 under test.

[0098] Specifically, for the same target degradation value, the control module 104 compares the power of the cellular interference signal required for each GNSS chip 20 under test to reach the target degradation value. The higher the required power, the better the signal quality of the GNSS chip under test under the same interference conditions, that is, the stronger the anti-interference capability of the GNSS chip under test.

[0099] Furthermore, under the same power of cellular interference signal injection, the control module 104 compares the carrier noise power density ratio of each GNSS chip 20 under test with the decrease value. The smaller the decrease value, the lower the degree of interference affecting the GNSS chip 20 under test under the same interference conditions, that is, the stronger the anti-interference capability of the GNSS chip under test.

[0100] Optionally, the control module 104 determines the anti-interference capability comparison results of each GNSS chip 20 under test based on the above comparison results. The comparison results can be presented to the user through the graphical user interface 1041 in the form of data tables, bar charts, line graphs, etc., to intuitively show the ranking of the anti-interference capabilities of each GNSS chip 20 under test under different test conditions.

[0101] In an optional implementation, the control module in the test system 10 for comparing the anti-interference capabilities of multiple GNSS chips provided in this application embodiment is further configured to send a cold start command to each GNSS chip 20 under test before performing sequential or parallel tests, so as to trigger each GNSS chip 20 under test to enter the cold start mode, and to ensure that all tests of each GNSS chip 20 under test are performed in the same initial working state.

[0102] The cold start command is used to instruct each GNSS chip under test 20 to perform a complete initialization process, including but not limited to: clearing the ephemeris data, almanac data, time information and location information stored inside the chip.

[0103] Optionally, before initiating any test procedure, the control module 104 broadcasts or sends a cold start command to all GNSS chips 20 under test through the communication interface of the GNSS chip 20 under test, so as to ensure that all GNSS chips 20 under test start the test from the same initial state.

[0104] It should be noted that in this state, none of the GNSS chips under test 20 contain any prior satellite orbit information, time information, or position information. All of them need to re-execute the satellite search, acquisition, and tracking process. This can eliminate the test deviation that may be introduced due to the differences in the historical working state of the chips. When all the GNSS chips under test 20 receive the same GNSS signal and cellular interference signal, their performance depends only on the chip's own hardware design, RF front-end architecture, and baseband processing algorithm, thereby ensuring the accuracy of the anti-interference capability comparison test.

[0105] Furthermore, the control module 104 repeats the above-mentioned cold start operation before the start of each test round to further ensure the independence between each test round and avoid mutual influence between the test results of the preceding and following rounds.

[0106] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0107] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A test system for comparing the anti-interference capabilities of multiple GNSS chips, characterized in that, The test system includes: a cellular signal generator, a GNSS signal generator, a test circuit board, and a control module. The test circuit board and the control module are both connected to multiple GNSS chips under test. The control module is connected to the cellular signal generator, the GNSS signal generator, and the test circuit board, respectively. The output terminals of the cellular signal generator and the GNSS signal generator are both connected to the input terminal of the test circuit board. The control module is used to control the cellular signal generator to generate a corresponding cellular interference signal and inject the cellular interference signal into the test circuit board; the control module is also used to control the GNSS signal generator to generate a corresponding GNSS signal and inject the GNSS signal into the test circuit board. The control module controls the test circuit board to sequentially or selectively turn on at least one test branch, and injects the cellular interference signal and / or the GNSS signal into the corresponding GNSS chip under test through the turned-on test branch; The control module is also used to collect the test results of each GNSS chip under test in real time, and to compare the anti-interference capabilities of each GNSS chip under test based on the test results.

2. The test system for comparing the anti-interference capabilities of multiple GNSS chips according to claim 1, characterized in that, The test system also includes: a first power divider; The first input terminal of the first power divider is connected to the output terminal of the cellular signal generator, and the second input terminal of the first power divider is connected to the output terminal of the GNSS signal generator. The output terminal of the first power divider is connected to the input terminal of the test circuit board; The first power divider is used to combine the cellular interference signal generated by the cellular signal generator and / or the GNSS signal generated by the GNSS signal generator and inject it into the test circuit board.

3. The test system for comparing the anti-interference capabilities of multiple GNSS chips according to claim 2, characterized in that, The test circuit board includes: a second power divider, a first single-pole double-throw switch, a single-pole multi-throw switch, and a switch matrix; The control terminals of the first single-pole double-throw switch, the single-pole multi-throw switch, and the switch matrix are all connected to the control module. The input terminal of the first single-pole double-throw switch is connected to the output terminal of the first power divider. The first output terminal of the first single-pole double-throw switch is connected to the input terminal of the single-pole multi-throw switch. The second output terminal of the first single-pole double-throw switch is connected to the input terminal of the second power divider. One output terminal of the single-pole multi-throw switch is connected to a first input terminal of the switch matrix, one output terminal of the second power divider is connected to a second input terminal of the switch matrix, and one output terminal of the switch matrix is ​​connected to an input terminal of a GNSS chip under test.

4. The test system for comparing the anti-interference capabilities of multiple GNSS chips according to claim 3, characterized in that, The switch matrix includes: a plurality of second single-pole double-throw switches, each of which corresponds one-to-one with a plurality of GNSS chips under test. The first input terminal of each second single-pole double-throw switch is connected to one output terminal of a single-pole multi-throw switch, and the second input terminal of each second single-pole double-throw switch is connected to one output terminal of the second power divider.

5. The test system for comparing the anti-interference capabilities of multiple GNSS chips according to claim 4, characterized in that, The control module is also used to control the cellular signal generator to stop working and control the GNSS signal generator to generate corresponding GNSS signals. At the same time, it controls the first single-pole double-throw switch to be turned on and the second power divider to be turned on, and controls the movable contacts of each second single-pole double-throw switch to switch to the second input terminal, so that the GNSS signals are injected into each GNSS chip under test in parallel, and determines the original carrier noise power density ratio of each GNSS chip under test based on the data collected from each GNSS chip under test.

6. The test system for comparing the anti-interference capabilities of multiple GNSS chips according to claim 4, characterized in that, The control module includes a graphical user interface, which obtains the target degradation value corresponding to each GNSS chip under test based on the configuration information input by the user in the graphical user interface.

7. The test system for comparing the anti-interference capabilities of multiple GNSS chips according to claim 6, characterized in that, The process by which the control module controls the test circuit board to be turned on sequentially includes: The cellular signal generator is controlled to generate a changing cellular interference signal, and the GNSS signal generator is controlled to generate a fixed GNSS signal. The first single-pole double-throw switch and the single-pole multi-throw switch are turned on, and the single-pole multi-throw switch is turned on to the first input terminal of a second single-pole double-throw switch in the switch matrix, so that the cellular interference signal and the GNSS signal are injected sequentially into a target GNSS chip under test. The cellular signal generator is controlled to generate a fixed cellular interference signal, and the GNSS signal generator is controlled to generate a fixed GNSS signal. The first single-pole double-throw switch is controlled to be turned on with the second power divider, and the second power divider is controlled to be turned on with the second input terminal of all the second single-pole double-throw switches in the switch matrix, so that the cellular interference signal and the GNSS signal are injected into all the GNSS chips under test in parallel.

8. The test system for comparing the anti-interference capabilities of multiple GNSS chips according to claim 6, characterized in that, The process by which the control module controls the selective conduction of the test circuit board includes: The cellular signal generator is controlled to generate a changing cellular interference signal, and the GNSS signal generator is controlled to generate a fixed GNSS signal. The first single-pole double-throw switch and the single-pole multi-throw switch are turned on, and the single-pole multi-throw switch is turned on to the first input terminal of a second single-pole double-throw switch in the switch matrix, so that the cellular interference signal and the GNSS signal are injected sequentially into a target GNSS chip under test. Alternatively, the cellular signal generator can be controlled to generate a fixed cellular interference signal, and the GNSS signal generator can be controlled to generate a fixed GNSS signal. The first single-pole double-throw switch and the second power divider can be turned on, and the second power divider can be turned on to the second input terminal of all the second single-pole double-throw switches in the switch matrix, so that the cellular interference signal and the GNSS signal are injected in parallel into all the GNSS chips under test.

9. The test system for comparing the anti-interference capabilities of multiple GNSS chips according to claim 7 or 8, characterized in that, The test results include: the decrease in the power of the cellular interference signal and / or the carrier noise power density ratio. The control module is also used to collect the test results of each GNSS chip under test in real time, and to compare the anti-interference capabilities of each GNSS chip under test based on the test results, including: When the original carrier noise power density ratio of the target GNSS chip under test decreases by the target degradation value, the power of the cellular interference signal corresponding to the decreased carrier noise power density ratio is recorded until the power of the cellular interference signal corresponding to the decreased carrier noise power density ratio of the last GNSS chip under test is recorded. And / or, record the decrease in the real-time carrier noise power density ratio of each GNSS chip under test compared to the original carrier noise power density ratio; The power of the cellular interference signal corresponding to the same target degradation value decrease in the original carrier noise power density ratio of each GNSS chip under test is compared, and / or the decrease magnitude of the real-time carrier noise power density ratio of each GNSS chip under test is compared to determine the anti-interference capability comparison result of each GNSS chip under test.

10. The test system for comparing the anti-interference capabilities of multiple GNSS chips according to claim 1, characterized in that, The control module is also used to send a cold start command to each GNSS chip under test before sequential or parallel testing, so as to trigger each GNSS chip under test to enter the cold start mode and ensure that all tests of each GNSS chip under test are performed in the same initial working state.

Images