A Beidou RF Baseband Product Testing Device

Abstract

The present invention discloses a Beidou radio frequency baseband product testing device, which includes a signal simulation module, an interference module, a processing module, a wireless testing module and a wired testing module; the signal simulation module includes a GNSS signal simulator, an RDSS signal simulator, a power divider and a satellite signal repeater; the interference module includes an interference signal simulator; the processing module includes an inbound receiver, an interface adaptation unit and a data processing terminal; the wireless testing module includes a microwave anechoic chamber, and a turntable for the product under test, a receiving antenna and a transmitting antenna arranged in the microwave anechoic chamber; the wired testing module includes a programmable power supply for the product under test and a power control unit; each device in each module is connected in an orderly manner and cooperates together. The Beidou radio frequency baseband product testing device provided by the embodiment of the present invention has a simple structure of the entire testing device and can effectively improve the accuracy of product testing.

Description

Technical Field

[0001] The present invention relates to the technical field of product testing, and particularly to a Beidou radio frequency baseband product testing device. Background Art

[0002] With the gradual maturity of the layout of the independently designed Beidou satellite navigation system in China, Beidou radio frequency baseband products have entered a crucial period of industrial application. Since most Beidou products integrate multiple technologies such as satellite navigation, mobile communication, mobile Internet, electronic map, and surveying and mapping, product forms include navigation chips, modules composed of chips with different functions, boards developed from chip modules, children's watches, navigators, surveying and positioning devices, or time service servers, etc. Therefore, in order to ensure the performance of Beidou radio frequency baseband products, during the process of researching and manufacturing Beidou radio frequency baseband products, strict simulation tests are required to ensure product quality.

[0003] In the prior art, the testing device for Beidou products has a complex structure, and does not comprehensively consider the different impacts of the uplink or downlink on the product during the signal transmission process. The testing effect is single, and it does not involve the impact of power factors on the signal either. Therefore, during the actual detection process, there will be phenomena such as the inability to detect interference signals or treating slightly stronger signals as interference signals and suppressing them, resulting in a decrease in the testing accuracy rate, an extension of the testing process, and thus affecting the quality and reliability of the products. Summary of the Invention

[0004] An embodiment of the present invention provides a Beidou radio frequency baseband product testing device to solve the technical problem of low testing accuracy rate of the existing product testing device. By setting the effective cooperation of each module, the testing device is optimized, and the testing accuracy rate is improved.

[0005] To solve the above technical problem, an embodiment of the present invention provides a Beidou radio frequency baseband product testing device, which includes a signal simulation module, an interference module, a processing module, a wireless testing module, and a wired testing module;

[0006] The signal simulation module includes a GNSS signal simulator, an RDSS signal simulator, a power splitter, and a satellite signal repeater; the interference module includes an interference signal simulator; the processing module includes an inbound receiver, an interface adaptation unit, and a data processing terminal; the wireless testing module includes a microwave anechoic chamber, and a DUT turntable, a receiving antenna, and a transmitting antenna arranged in the microwave anechoic chamber; the wired testing module includes a DUT programmable power supply and a power control unit;

[0007] The RF signal output ends of the GNSS signal simulator and the RDSS signal simulator are respectively connected to the input end of the power divider, and the output end of the power divider is connected to the input end of the satellite signal transponder; the signal input ends of the inbound receiver are respectively connected to the output end of the satellite signal transponder and the output end of the interference signal simulator, and the signal input end of the interface adaptation unit is connected to the signal output end of the inbound receiver;

[0008] The transmitting antenna is communicatively connected to the first interface of the interface adaptation unit, and the receiving antenna is communicatively connected to the second interface of the interface adaptation unit; the programmed power supply of the product under test is connected to the output end of the power control unit, and the input end of the power control unit is connected to the third interface of the interface adaptation unit.

[0009] As a preferred solution, the power control unit includes a power attenuator. The programmed power supply of the product under test is connected to the output end of the power attenuator, and the input end of the power attenuator is connected to the third interface of the interface adaptation unit.

[0010] As a preferred solution, the signal simulation module further includes a spectrum analyzer. The RF signal output ends of the GNSS signal simulator and the RDSS signal simulator are connected to the receiving end of the spectrum analyzer.

[0011] As a preferred solution, the wireless test module further includes a signal regeneration device. The receiving antenna is connected to the input end of the signal regeneration device through a shielded coaxial cable, and the transmitting antenna is connected to the output end of the signal regeneration device through a shielded coaxial cable.

[0012] As a preferred solution, the programmed power supply of the product under test includes a single-ended flyback pulse width modulation converter.

[0013] As a preferred solution, the processing module further includes a switch. The interface adaptation unit is connected to the data processing terminal through the switch.

[0014] As a preferred solution, the receiving antenna is further connected to the fourth interface of the interface adaptation unit through a shielded coaxial cable.

[0015] As a preferred solution, the product under test turntable is provided with a product under test mounting bracket and an antenna bracket.

[0016] As a preferred solution, the interference signal simulator is an E4438C signal generator.

[0017] Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows: by setting corresponding signal simulation modules for different antenna signals in the test device, comprehensively considering the influence of the interference of actual signals on the product, and separately setting a wireless test module and a wired test module representing the uplink and downlink, and finally obtaining the comprehensive performance of the product through the test data received by the processing module, the entire test device has a simple structure, effective cooperation among modules, comprehensive test functions, improves the overall test effect of the test device, saves the detection time, improves the detection accuracy of the product, and further ensures the reliability of the functions of the Beidou radio frequency baseband product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the positioning tooling of the clutch driven disc in the embodiments of the present invention;

[0019] Among them, 1. Signal simulation module; 2. Interference module; 3. Processing module; 4. Wireless test module; 5. Wired test module; 11. GNSS signal simulator; 12. RDSS signal simulator; 13. Power divider; 14. Satellite signal repeater; 21. Interference signal simulator; 31. Inbound receiver; 32. Interface adaptation unit; 33. Data processing terminal (not shown in the figure); 41. Microwave anechoic chamber; 42. Turntable for the product under test; 43. Receiving antenna; 44. Transmitting antenna; 51. Program-controlled power supply for the product under test; 52. Power control unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] In the description of the present application, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0022] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0023] In the description of this application, it should be noted that unless otherwise defined, all the technical and scientific terms used in this invention have the same meanings as those commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the specification of this invention are only for the purpose of describing specific embodiments, and are not intended to limit this invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0024] An embodiment of the present invention provides a Beidou radio frequency baseband product testing device. Specifically, please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a Beidou radio frequency baseband product testing device provided by an embodiment of the present invention, and includes a signal simulation module 1, an interference module 2, a processing module 3, a wireless testing module 4, and a wired testing module 5.

[0025] The signal simulation module 1 includes a GNSS signal simulator 11, an RDSS signal simulator 12, a power splitter 13, and a satellite signal repeater 14; the interference module 2 includes an interference signal simulator 21; the processing module 3 includes an inbound receiver 31, an interface adaptation unit 32, and a data processing terminal 33 (not shown in the figure); the wireless testing module 4 includes a microwave anechoic chamber 41, and a DUT turntable 42, a receiving antenna 43, and a transmitting antenna 44 arranged in the microwave anechoic chamber; the wired testing module 5 includes a DUT programmable power supply 51 and a power control unit 52.

[0026] It should be noted that in this embodiment, the RF signal output terminals of the GNSS signal simulator and the RDSS signal simulator are respectively connected to the input terminal of the power divider, and the output terminal of the power divider is connected to the input terminal of the satellite signal transponder; the signal input terminals of the inbound receiver are respectively connected to the output terminal of the satellite signal transponder and the output terminal of the interference signal simulator, and the signal input terminal of the interface adaptation unit is connected to the signal output terminal of the inbound receiver; the transmitting antenna is communicatively connected to the first interface of the interface adaptation unit, and the receiving antenna is communicatively connected to the second interface of the interface adaptation unit; the power supply of the product under test is connected to the output terminal of the power control unit, and the input terminal of the power control unit is connected to the third interface of the interface adaptation unit.

[0027] In the process of testing Beidou series products, signal simulation is a very important link. Through the GNSS signal simulator, GNSS static simulation of actual satellite signals and GNSS dynamic scenario playback simulation of actual satellite signals can be realized, so as to facilitate the testing of various GNSS performance indicators of Beidou RF baseband products under real GNSS signals. Of course, the RDSS signal can also be simulated through the RDSS simulator to conduct relevant closed-loop tests on short messages of Beidou RF baseband products, which is determined by actual test requirements.

[0028] In this embodiment, the object under test is a Beidou radio frequency baseband product, which includes products such as Beidou PNT chips, boards, terminals, and antennas. The testing of the products is mainly distributed in the wireless testing module and the wired testing module. It should be noted that the size of the anechoic chamber floor in the wireless testing module is preferably 10m×10m×10m. The distance between the antenna and the turntable of the product under test should also comprehensively consider the space of the anechoic chamber and the absorbing material of the antenna; the GNSS signal simulator is preferably the satellite navigation signal simulator CETC-NS8400 developed by the 54th Research Institute of China Electronics Technology Group Corporation. It has the function of configuring satellite channel parameters. The pseudorange, carrier phase, Doppler, and power of each channel can be independently set. At the same time, it has the function of multipath signal simulation, which can generate multipath signals according to the environmental model, or generate multipath signals according to the specified delay and power. In cooperation with the subsequent power control unit, it better simulates the power factor and provides accurate data support for the influence of the power factor on the signal; the power splitter is a device that divides the energy of an input signal into two or more output signals with equal or unequal energy, or conversely, combines the energy of multiple signals into one output; the inbound receiver is used to process and receive the signals of the uplink and downlink, and parse the received inbound signals to complete the measurement of relevant observable data; the data processing terminal is provided with data analysis and control functions related to data simulation calculation, navigation signal evaluation, turntable control, and serial port control, and it can be a combination of one or more computers; the interference signal simulator has the function of inputting external frequency signals and the function of generating interference signals; the main function of the interface adaptation unit includes combining and distributing the GNSS, RDSS simulation signals and interference signals to achieve better test results; the turntable of the product under test has the function of realizing azimuth and pitch electric rotation under the control of the host computer. The Beidou product under test can be installed on the azimuth tabletop of the turntable through a bracket, and the phase center remains unchanged during the azimuth and pitch movements. Of course, the turntable can also be set with corresponding electric lifting and electric polarization functions.

[0029] Preferably, in the above embodiment, the power control unit includes a power attenuator. The programmed power supply of the product under test is connected to the output end of the power attenuator, and the input end of the power attenuator is connected to the third interface of the interface adaptation unit. Since in the actual communication process of Beidou products, the antenna signal will inevitably attenuate, in this embodiment, by introducing a power attenuator in the wired testing module, attenuation is caused within a specified frequency range, and the performance of the Beidou radio frequency baseband product in this case is tested, improving the overall test effect of the testing device.

[0030] Preferably, in the above embodiments, the signal simulation module further includes a spectrum analyzer. The RF signal output ends of the GNSS signal simulator and the RDSS signal simulator are connected to the receiving end of the spectrum analyzer. The spectrum analyzer can better detect the actual parameters of various types of signals, thereby facilitating the regulation of the test signals and ensuring the accuracy rate of the signals.

[0031] Preferably, in the above embodiments, the wireless test module further includes a signal regeneration device. The receiving antenna is connected to the input end of the signal regeneration device through a shielded coaxial cable, and the transmitting antenna is connected to the output end of the signal regeneration device through a shielded coaxial cable. By processing the damaged or distorted signals and removing the noise interference and restoring the damaged parts of the signals, the test device can reduce the test errors caused by signal damage and improve the accuracy rate of the test.

[0032] Preferably, in the above embodiments, the programmed power supply for the product under test includes a single-ended flyback pulse width modulation converter. Since the test device in this embodiment needs to comprehensively consider the influence of the power factor, a single-ended flyback pulse width modulation converter is provided in the programmed power supply for the product under test, which removes the power limitation, thereby facilitating the regulation of the test indicators and achieving good test results.

[0033] Preferably, in the above embodiments, the processing module further includes a switch. The interface adaptation unit is connected to the data processing terminal through the switch.

[0034] Preferably, in the above embodiments, the receiving antenna is also connected to the fourth interface of the interface adaptation unit through a shielded coaxial cable to ensure that during the actual test process, the test device can monitor the working performance of the receiving antenna in real time, which facilitates the fault maintenance of the receiving antenna.

[0035] Preferably, in the above embodiments, the turntable for the product under test is provided with a mounting bracket for the product under test and an antenna bracket. The mounting bracket for the product under test is for facilitating the installation of the Beidou RF baseband product and ensuring its stability during the test. The main function of the antenna bracket is to realize the antenna switching function of the product under test and to facilitate the replacement of the test antenna.

[0036] Preferably, in the above embodiments, the interference signal simulator has the function of external frequency signal input and at the same time has the function of generating interference signals, and it is an E4438C type signal generator.

[0037] The Beidou RF baseband product testing device provided by the embodiments of the present invention has the beneficial effects that by setting corresponding signal simulation modules for different antenna signals in the testing device, comprehensively considering the influence of the interference of actual signals on the product, respectively setting wireless testing modules and wired testing modules representing the uplink and downlink, and finally obtaining the comprehensive performance of the product through the test data received by the processing module, the whole testing device has a simple structure, the modules cooperate effectively, improving the overall testing effect of the testing device, ensuring the reliability of the functions of the Beidou RF baseband product, saving the detection time, and greatly improving the detection accuracy of the product.

[0038] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A Beidou RF baseband product testing device, characterized in that It includes a signal simulation module, an interference module, a processing module, a wireless test module and a wired test module; The signal simulation module includes a GNSS signal simulator, an RDSS signal simulator, a power divider and a satellite signal repeater; the interference module includes an interference signal simulator; the processing module includes an inbound receiver, an interface adaptation unit and a data processing terminal; the wireless test module includes a microwave anechoic chamber, and a DUT turntable, a receiving antenna and a transmitting antenna arranged in the microwave anechoic chamber; the wired test module includes a DUT programmable power supply and a power control unit; The RF signal output ends of the GNSS signal simulator and the RDSS signal simulator are respectively connected to the input end of the power divider, and the output end of the power divider is connected to the input end of the satellite signal repeater; the signal input end of the inbound receiver is respectively connected to the output end of the satellite signal repeater and the output end of the interference signal simulator, and the signal input end of the interface adaptation unit is connected to the signal output end of the inbound receiver; The transmitting antenna is communicatively connected to the first interface of the interface adaptation unit, and the receiving antenna is communicatively connected to the second interface of the interface adaptation unit; the DUT programmable power supply is connected to the output end of the power control unit, and the input end of the power control unit is connected to the third interface of the interface adaptation unit; The power control unit includes a power attenuator, the DUT programmable power supply is connected to the output end of the power attenuator, and the input end of the power attenuator is connected to the third interface of the interface adaptation unit; The wireless test module further includes a signal regeneration device, the receiving antenna is connected to the input end of the signal regeneration device through a shielded coaxial cable, and the transmitting antenna is connected to the output end of the signal regeneration device through a shielded coaxial cable.

2. The Beidou radio frequency baseband product testing device according to claim 1, wherein The signal simulation module further includes a spectrum analyzer, and the RF signal output ends of the GNSS signal simulator and the RDSS signal simulator are connected to the receiving end of the spectrum analyzer.

3. The Beidou radio frequency baseband product testing device according to claim 1, wherein The DUT programmable power supply includes a flyback single-ended pulse width modulation converter.

4. The Beidou radio frequency baseband product testing device according to claim 1, wherein The processing module further includes a switch, and the interface adaptation unit is connected to the data processing terminal through the switch.

5. The Beidou RF baseband product testing device according to claim 1, wherein The receiving antenna is also connected to the fourth interface of the interface adaptation unit through a shielded coaxial cable.

6. The Beidou RF baseband product testing device according to claim 1, characterized in that, A DUT mounting bracket and an antenna bracket are provided on the DUT turntable.

7. The Beidou RF baseband product testing device according to claim 1, wherein The interference signal simulator is an E4438C signal generator.

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