Test system of GPS+BDS dual-system module

Abstract

The utility model provides a GPS + BDS double system module's test system, including GPS + BDS signal generator, GPS + BDS transmitting antenna, GPS + BDS double system module to be measured, GPS + BDS double system standard module, interface conversion module, main control module and host computer, GPS + BDS transmitting antenna, GPS + BDS signal generator, main control module and interface conversion module connect in proper order, GPS + BDS double system module to be measured and GPS + BDS double system standard module are connected with host computer through interface conversion module respectively. The utility model discloses can be to full -automatic form to multiple GPS + BDS double system module to be measured simultaneously and test, and the test efficiency is greatly promoted, and the whole test process is not influenced by environment and weather, can stably guarantee the index consistency of test product.

Description

Technical Field

[0001] This utility model relates to the field of wireless communication technology, specifically to a test system for a GPS+BDS dual-system module. Background Technology

[0002] With the advancement of global intelligence, various embedded terminal communication electronic devices are flourishing, leading to the Internet of Things. To facilitate users' real-time understanding of the status of each terminal device, it is essential to synchronously feed back the location information of the terminal devices to the user center; correspondingly, terminal devices need to have GPS / BDS modules with positioning capabilities. For GPS / BDS modules, the hardware design is simple and transparent; the challenge lies in ensuring the consistency of products leaving the factory, which largely depends on the test plan and the setup of the test environment.

[0003] The following testing solutions are currently available on the market:

[0004] (1) Conducted signal test: The GPS / BDS signal is output by a GPS / BDS signal generator and connected to the RF connector of the GPS / BDS module via a coaxial cable for conducted signal test. The test results are presented on the GPS / BDS carrier-to-noise ratio tester. This test scheme is mainly applied to GPS and BDS modules without positioning antennas. It is a one-to-one test, that is, one module is tested at a time, which is inefficient. In addition, for GPS+BDS dual-system modules, after testing one system, such as the GPS system, it is necessary to manually switch the operating frequency of the GPS / BDS signal generator to test the other system, such as the BDS system, which has a relatively high probability of operation error.

[0005] (2) Off-site radiation test: Move the module to an open outdoor environment, or install a GPS / BDS transponder to relay the GPS and BDS signals indoors. Then, use a GPS / BDS carrier-to-noise ratio tester to read the signal strength and positioning information of the module under test for judgment. This test scheme is mainly applied to GPS and BDS modules with positioning antennas. It is a one-to-many test, that is, multiple modules can be tested at a time, which improves the test efficiency. However, it is greatly affected by the test environment, especially on rainy or foggy days, the test results are very poor. Due to the difference in test results at different times of day and under different weather conditions, it is impossible to guarantee the consistency of product RF indicators.

[0006] Therefore, there is an urgent need for a testing system for GPS / BDS system modules that can meet the requirements of one-to-many testing with a radiation method and is not affected by the external environment. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a test system for GPS+BDS dual-system modules, which can improve test efficiency and ensure the consistency of radio frequency indicators of the module under test.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0009] A test system for a GPS+BDS dual-system module includes: a GPS+BDS signal generator, a GPS+BDS transmitting antenna, a GPS+BDS dual-system module under test, a GPS+BDS dual-system standard module, an interface conversion module, a main control module, and a host computer.

[0010] The GPS+BDS transmitting antenna, GPS+BDS signal generator, main control module, and interface conversion module are connected in sequence; the GPS+BDS dual-system test module and the GPS+BDS dual-system standard module are respectively connected to the host computer through the interface conversion module; the GPS+BDS dual-system test module and the GPS+BDS dual-system standard module are each set corresponding to the GPS+BDS transmitting antenna.

[0011] Optionally, the number of GPS+BDS dual-system modules under test is two or more.

[0012] Optionally, it also includes a power module; the power module is connected to the GPS+BDS dual-system under test module, the GPS+BDS dual-system standard module, the interface conversion module, and the main control module, respectively.

[0013] Optionally, it also includes a barcode scanner; the barcode scanner is connected to the host computer.

[0014] Optionally, the interface conversion module is a USB to serial port module.

[0015] Optionally, the main control module includes an Ethernet interface; the Ethernet interface is connected to the GPS+BDS signal generator.

[0016] Optionally, the GPS+BDS transmitting antenna is a passive four-star full-band antenna of model BT-200S.

[0017] Optionally, it also includes a test fixture housing; the top of the test fixture housing is provided with two or more test module placement positions and one standard module placement position, so as to respectively place the GPS+BDS dual system test module with the antenna facing down and the GPS+BDS dual system standard module;

[0018] The GPS+BDS transmitting antenna, interface conversion module, and main control module are located inside the test fixture housing; the GPS+BDS signal generator is located outside the test fixture housing and is connected to the GPS+BDS transmitting antenna via an RF coaxial cable.

[0019] Optionally, the GPS+BDS transmitting antenna maintains a vertical distance of 15-25cm between itself and both the GPS+BDS dual-system test module and the GPS+BDS dual-system standard module.

[0020] Optionally, a base plate is provided at the bottom of the test fixture housing; the interface conversion module and the main control module are fixedly mounted on the base plate.

[0021] The beneficial effects of this invention are as follows: It provides a testing system for GPS+BDS dual-system modules, capable of simultaneously testing multiple GPS+BDS dual-system modules under test in a fully automatic manner, significantly improving testing efficiency. Furthermore, the entire testing process is unaffected by environmental or weather conditions, ensuring consistent product performance. Simultaneously, due to its connection to a host computer, it not only allows for dynamic adjustment of testing commands, resulting in more comprehensive testing, but also supports real-time, visual comparison and display of test results between the modules under test and standard modules, achieving higher testing accuracy and providing immediate feedback. Additionally, it can synchronously save test data from all modules under test, facilitating subsequent traceability, analysis, and performance optimization. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the test system for the GPS+BDS dual-system module provided in Embodiment 1 of the present invention;

[0023] Figure 2 This is a schematic diagram of the test system for the GPS+BDS dual-system module provided in Embodiment 2 of the present invention;

[0024] Figure 3 This is a schematic diagram of the test fixture implemented by the test system based on the GPS+BDS dual-system module provided in Embodiment 3 of the present invention.

[0025] Label Explanation

[0026] 1. Position for the module under test; 2. Position for the standard module; 3. GPS+BDS transmitting antenna;

[0027] 4. GPS+BDS signal generator; 5. Base plate. Detailed Implementation

[0028] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0029] Example 1

[0030] Please see Figure 1This embodiment provides a test system for a GPS+BDS dual-system module, including: a GPS+BDS signal generator, a GPS+BDS transmitting antenna, a GPS+BDS dual-system module under test, a GPS+BDS dual-system standard module, an interface conversion module, a main control module, and a host computer.

[0031] The GPS+BDS transmitting antenna, GPS+BDS signal generator, main control module, and interface conversion module are connected in sequence; the GPS+BDS dual-system test module and the GPS+BDS dual-system standard module are respectively connected to the host computer through the interface conversion module; the GPS+BDS dual-system test module and the GPS+BDS dual-system standard module are each set corresponding to the GPS+BDS transmitting antenna.

[0032] This embodiment provides a test system for a GPS+BDS dual-system module, the working principle of which is as follows:

[0033] The host computer sends test commands to the main control module through the interface conversion module. The main control module switches the RF output frequency of the GPS+BDS signal generator according to the test commands to test different systems (GPS / BDS) separately. The GPS / BDS signals emitted by the GPS+BDS signal generator are sent to the GPS+BDS transmitting antenna and radiated outwards. The GPS+BDS dual-system module under test and the GPS+BDS dual-system standard module receive the signals emitted by the GPS+BDS transmitting antenna, demodulate them through their respective internal positioning chips, and output test data carrying the standard protocol. The test data is transmitted to the host computer through the interface conversion module. After acquiring the test data, the host computer stores it along with the corresponding module. Simultaneously, the host computer compares the test data of the standard module and the module under test to determine whether the module under test has passed the test, and obtains and displays the test results.

[0034] In some specific embodiments, the test system further includes a power supply module, which is connected to the GPS+BDS dual-system module under test, the GPS+BDS dual-system standard module, the interface conversion module, and the main control module, respectively. The power supply module is used to supply power to the active components of the entire test system.

[0035] The interface module described in this embodiment is used for interface conversion between the GPS+BDS dual-system under-test module, the GPS+BDS dual-system standard module, the main control module, and the host computer.

[0036] In some specific embodiments, the interface conversion module is a USB to serial port module. Preferably, it is equipped with at least eight serial interfaces.

[0037] Specifically, the test commands issued by the host computer are sent to the interface conversion module via the USB port. The interface conversion module converts the test commands from USB data format to serial data format and then sends them to the GPS+BDS dual-system test module, the GPS+BDS dual-system standard module, and the main control module. The GPS+BDS dual-system test module and the GPS+BDS dual-system standard module send the test data to the interface conversion module via the serial port. The interface conversion module converts the serial data to USB data format and then sends it to the host computer for analysis and result saving.

[0038] As a specific example, the interface conversion module is implemented using a CH348Q USB to 8-port serial chip, which can convert eight serial ports into one USB port, minimizing the amount of external wiring.

[0039] The main control module in this embodiment is used to automatically switch the RF output frequency of the GPS+BDS signal generator according to the test instructions issued by the host computer.

[0040] In some specific implementations, the main control module is connected to the network port of the GPS+BDS signal generator via its Ethernet interface. When testing the GPS system, the main control module switches the frequency of the GPS+BDS signal generator to 1575.42MHz; when testing the BDS system, the main control module switches the frequency of the GPS+BDS signal generator to 1561.098MHz; additionally, the main control module fixes the RF output power of the GPS+BDS signal generator to -130dBm.

[0041] As a specific example, the main control module is implemented using a CH32V307 main control chip, which has the advantages of powerful performance, low power consumption, security and reliability, rich interfaces and high cost performance.

[0042] The GPS+BDS signal generator described in this embodiment is used to switch its radio frequency output frequency under the control of the main control module, and output corresponding GPS and BDS signals.

[0043] In some specific implementations, the GPS+BDS signal generator is implemented using a CMW500 standard comprehensive test instrument.

[0044] Here, a GPS+BDS signal generator is used to output GPS and BDS signals. The radiation method meets the requirements of one-to-many testing and is not affected by the external environment. While improving testing efficiency, it can also ensure the consistency of the radio frequency indicators of the product under test. In addition, it can automatically adjust the output frequency of the GPS and BDS signal generators in real time according to the test command to ensure that both GPS and BDS dual positioning systems can be covered in the test, making the test more comprehensive.

[0045] The GPS+BDS transmitting antenna described in this embodiment is used to radiate the GPS and BDS signals emitted by the GPS+BDS signal generator outwards.

[0046] In some specific implementations, the GPS+BDS transmitting antenna is implemented using a BT-200S Beitian GPS, BDS, GLONASS, and GALILEO passive four-satellite full-band antenna.

[0047] The GPS+BDS dual-system module under test described in this embodiment is the same model as the GPS+BDS dual-system standard module. The GPS+BDS dual-system standard module is a module that has undergone standard laboratory testing and serves as a comparative test module. Its test data is used to determine the test data of the module under test and to derive the test results.

[0048] Example 2

[0049] Please refer to Figure 2 This embodiment is a further extension of Embodiment 1, specifically designed for the efficient simultaneous testing of multiple GPS+BDS dual-system modules under test.

[0050] The GPS+BDS dual-system module test system of this embodiment has two or more GPS+BDS dual-system modules under test.

[0051] Each GPS+BDS dual-system test module has an antenna corresponding to a GPS+BDS transmitting antenna; simultaneously, each GPS+BDS dual-system test module is connected to an interface conversion module. If the GPS+BDS dual-system test module does not have its own power supply, each GPS+BDS dual-system test module will also be connected to the power supply module.

[0052] In some specific implementations, when the GPS+BDS dual-system module under test (DUT) sends the standard protocol to the host computer, it can also carry the DUT's unique code, enabling the host computer to identify and associate the test data and test results corresponding to different DUT modules. The unique code has a unique correspondence with the corresponding module.

[0053] In other specific implementations, a barcode scanner can be added to efficiently collect the unique code of the module under test and transmit it directly to the host computer. This allows the host computer to associate the unique code with the corresponding test data and results for each module. The unique code is a QR code or product serial number (SN) and has a unique correspondence with the corresponding module.

[0054] Specifically, the testing system also includes a barcode scanner, which is connected to the host computer. The barcode scanner is used to scan and obtain the unique code of the GPS+BDS dual-system module under test, and send the unique code to the host computer so that the host computer can establish the association between the unique code, test data, test results, port number, and other information of the module under test.

[0055] By adding a scanner, the unique code of the module under test can be collected efficiently, effectively avoiding errors caused by manual input and ensuring the accuracy of the test results.

[0056] If the added barcode scanner is not equipped with its own power supply, it will also be connected to the power module of the test system.

[0057] As a specific example, the power module can be a power module that is powered by an external DC mobile power supply at DC / 12V. After the DC / 12V is input to the power module, it is divided into two paths internally. One path directly powers the barcode scanner; the other path converts the DC / 12V to DC / 3.3V through a DC / DC device (such as LA2433E), and then powers the GPS+BDS dual-system module under test, the GPS+BDS dual-system standard module, the interface conversion module, and the main control module, respectively.

[0058] The GPS+BDS dual-system module testing system provided in this embodiment can simultaneously test multiple GPS+BDS dual-system modules under test in a fully automatic manner, greatly improving testing efficiency while ensuring the accuracy of test results.

[0059] Example 3

[0060] This embodiment further expands upon Embodiment 2, providing a test fixture implemented based on the aforementioned GPS+BDS dual-system module test system.

[0061] The test fixture in this embodiment includes a test fixture housing. For example... Figure 3 As shown, the top of the test fixture box is provided with two or more test module placement positions 1 and one standard module placement position 2; wherein, the test module placement position 1 is used to place the GPS+BDS dual system test module with the antenna facing downward; the standard module placement position 2 is used to place the GPS+BDS dual system standard module with the antenna facing downward.

[0062] The GPS+BDS transmitting antenna, interface conversion module, and main control module are housed inside the test fixture enclosure; the GPS+BDS signal generator is located outside the test fixture enclosure and is connected to the GPS+BDS transmitting antenna.

[0063] In some specific implementations, such as Figure 3 As shown, the GPS+BDS transmitting antenna 3 and the GPS+BDS signal generator 4 are connected by a coaxial cable, and the GPS+BDS transmitting antenna 3 is located inside the test fixture box near the center.

[0064] In some specific embodiments, the GPS+BDS transmitting antenna and the antenna of the GPS+BDS dual-system test module are maintained at a vertical distance of 15-25 cm. Similarly, the GPS+BDS transmitting antenna and the antenna of the GPS+BDS dual-system standard module are maintained at a vertical distance of 15-25 cm. This ensures that there is sufficient space between the transmitting and receiving antennas, meets wireless radio frequency transmission standards, and guarantees the validity of the test.

[0065] In some specific implementations, such as Figure 3 As shown, a base plate 5 is provided at the bottom of the test fixture housing; the interface conversion module, main control module, and power supply module are all fixedly mounted on the base plate 5. The base plate is connected to the host computer via a USB cable.

[0066] In some specific implementations, each module placement position on the top of the test fixture housing is equipped with a pressing pin corresponding to the four pins TXD, RXD, VCC, and GND of the module. One end of the pressing pin corresponding to the module under test is connected to the corresponding pin of the module, and the other end is connected to the test fixture housing via a ribbon cable, specifically to the base plate located at the bottom of the test fixture housing. One end of the pressing pin corresponding to the standard module is connected to the corresponding pin of the module, and the other end is directly connected to the base plate located at the bottom of the test fixture housing.

[0067] Specifically, when the antenna of the module under test is placed downwards on the module under test mounting position, and the four pins of each module under test (TXD, RXD, VCC, GND) are pressed and in good contact with the corresponding pressing pins on the module under test mounting position, the connection relationship is shown in Table 1 below:

[0068] Module under test Interface conversion module Power module TXD RXD RXD TXD VCC DC / 3.3V GND Power GND

[0069] Table 1

[0070] When the standard module antenna is placed downwards in the standard module mounting position, and its four pins (TXD, RXD, VCC, and GND) are pressed and in good contact with the corresponding pressing pins on the standard module mounting position, the connection relationship is shown in Table 2 below:

[0071] Standard Module Interface conversion module Power module TXD RXD RXD TXD VCC DC / 3.3V GND Power GND

[0072] Table 2

[0073] This embodiment provides a test fixture for a GPS+BDS dual-system module, which features a simple structure and easy operation. It can achieve fully automated, high-efficiency, high-reliability, high-stability, and low-cost testing of the GPS+BDS dual-system module.

[0074] Example 4

[0075] This embodiment further extends the above-described embodiment two or three, providing a testing method for a GPS+BDS dual-system module based on the above-described GPS+BDS dual-system module testing system, including the following steps:

[0076] S1: Fix the GPS+BDS dual-system module under test and the GPS+BDS dual-system standard module onto the test fixture respectively;

[0077] S2: Power module power-on, one path supplies DC / 12V to the barcode scanner, and the other path supplies DC / 3.3V to the GPS+BDS dual-system module under test, the GPS+BDS dual-system standard module, the main control module, and the interface conversion module;

[0078] S3: The barcode scanner is connected to the PC via USB. Use the barcode scanner to scan the SN code on the module under test and record the corresponding SN codes of all modules under test on the PC.

[0079] Specifically, this step includes the following sub-steps:

[0080] S301: The display window on the PC for each module under test shall contain at least four data items: port number, SN code, test data, and test result; where port number 1 corresponds to module 1# and ... port number n corresponds to module n#.

[0081] S302: When it is necessary to enter the SN code of a certain module under test on the PC host computer, click the SN code field corresponding to the module under test on the PC host computer screen (controlled by mouse or touch screen);

[0082] S303: Use a handheld barcode scanner to scan the barcode on the label of the module under test, obtain its SN code, and then automatically fill it into the currently specified SN number field on the PC host computer screen.

[0083] S304: Complete the scanning of the SN codes of all modules under test and the entry into the PC host computer in sequence.

[0084] S4: The PC host computer sends out test commands, which are converted into serial port data by the interface conversion module and then sent to the GPS+BDS dual-system module under test, the GPS+BDS dual-system standard module and the main control module respectively.

[0085] S5: The main control module switches the RF output frequency of the GPS+BDS signal generator according to the test command; when testing the GPS system, the instrument is set to 1575.42MHz; when testing the BDS system, the instrument frequency is 1561.098MHz; in addition, the RF output power of the GPS+BDS signal generator is fixed at -130dBm.

[0086] S6: The GPS and BDS signals emitted by the GPS+BDS signal generator are transmitted to the GPS+BDS transmitting antenna through a coaxial cable. After being radiated out by the GPS+BDS transmitting antenna, they are received by the antennas on the GPS+BDS dual-system test module and the GPS+BDS dual-system standard module, and then transmitted to the corresponding positioning chip inside the module.

[0087] Assuming the test command issued by the PC host computer corresponds to the test of the GPS system, it is sent to the GPS positioning chip. After demodulation by the GPS positioning chip, it outputs the NMEA0183 protocol, which conforms to the unified standard of GPS navigation devices, through the serial port. This protocol includes the statements shown in Table 3 below:

[0088]

[0089]

[0090] Table 3

[0091] S7: The NMEA0183 protocol output by the GPS+BDS dual-system test module and the GPS+BDS dual-system standard module is converted from serial port output data to USB interface data and then sent to the PC host computer via the interface conversion module.

[0092] S8: The PC host computer extracts the $GPGSV statement from the NMEA0183 protocol, parses it to obtain the satellite PRN code and corresponding signal-to-noise ratio (SNR) value, and saves it according to the previously scanned and entered SN number; the parsing example of the $GPGSV statement is shown in Table 4 below:

[0093] $GPGSV Standard Statement Analysis $GPGSV Example: $GPGSV,3,1,10,20,78,331,45,01,59,235,47,22,41,069,,13,32,252,45*70 Field 0: $GPGSV, Statement ID, indicating that this statement is for GPS Satellites in View (GSV) visible satellite information. Field 1: Total number of GSV statements in this transaction (1-3) Field 2: This is the nth GSV statement in this series (1-3). Field 3: Total number of currently visible satellites (00-12) (add 0s if necessary) Field 4: PRN code (pseudo-random noise code) (01-32) (padding with 0s if necessary) Field 5: Satellite elevation angle (00-90) degrees (add 0s if necessary) Field 6: Satellite azimuth (00-359) degrees (add leading zeros if necessary) Field 7: Signal-to-noise ratio (00-99) dBHz Field 8: PRN code (pseudo-random noise code) (01-32) (padding with 0s if necessary) Field 9: Satellite elevation angle (00-90) degrees (add 0s if necessary) Field 10: Satellite azimuth (00-359) degrees (add leading zeros if necessary) Field 11: Signal-to-noise ratio (00-99) dBHz Field 12: PRN code (pseudo-random noise code) (01-32) (padding with 0s if necessary) Field 13: Satellite elevation angle (00-90) degrees (add 0s if necessary)

[0094] Table 4

[0095] S9: The PC host computer switches the test command to the system being tested. For example, if the previously issued test command corresponds to the GPS system, then it switches to the test command corresponding to the BDS system. The PRN code and corresponding SNR value of the GPS system and the PRN code and corresponding SNR value of the BDS system are obtained separately in the GPS+BDS dual-system test module, and the two sets of data are associated and saved with their respective serial numbers.

[0096] S10: Compare the test data of each GPS+BDS dual-system module under test with the SNR value of the GPS+BDS dual-system standard module:

[0097] If the SNR value of the module under test is within ±2dB of the SNR value of the standard module, the module under test is considered to have passed the test. The PC host computer can mark the corresponding SN number of the module under test in green, preferably with the output "PASS" for a more intuitive mark.

[0098] If the SNR value of the module under test is outside the range of ±2dB of the standard module SNR value, the module under test is judged to have failed the test. The PC host computer can mark the corresponding SN number of the module under test in red, preferably by outputting "FAIL" for a more intuitive mark.

[0099] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A testing system for a GPS+BDS dual-system module, characterized in that, include: GPS+BDS signal generator, GPS+BDS transmitting antenna, GPS+BDS dual-system module under test, GPS+BDS dual-system standard module, interface conversion module, main control module and host computer; The GPS+BDS transmitting antenna, GPS+BDS signal generator, main control module, and interface conversion module are connected in sequence; the GPS+BDS dual-system test module and the GPS+BDS dual-system standard module are respectively connected to the host computer through the interface conversion module; the GPS+BDS dual-system test module and the GPS+BDS dual-system standard module are each set corresponding to the GPS+BDS transmitting antenna.

2. The testing system for the GPS+BDS dual-system module as described in claim 1, characterized in that, The number of GPS+BDS dual-system modules under test is two or more.

3. The test system for the GPS+BDS dual-system module as described in claim 1, characterized in that, It also includes a power module; the power module is connected to the GPS+BDS dual-system under test module, the GPS+BDS dual-system standard module, the interface conversion module and the main control module respectively.

4. The test system for the GPS+BDS dual-system module as described in claim 1, characterized in that, It also includes a barcode scanner; the barcode scanner is connected to the host computer.

5. The test system for the GPS+BDS dual-system module as described in claim 1, characterized in that, The interface conversion module is a USB to serial port module.

6. The test system for the GPS+BDS dual-system module as described in claim 1, characterized in that, The main control module includes an Ethernet interface; the Ethernet interface is connected to the PS+BDS signal generator.

7. The test system for the GPS+BDS dual-system module as described in claim 1, characterized in that, The GPS+BDS transmitting antenna is a passive four-star full-band antenna of model BT-200S.

8. The test system for the GPS+BDS dual-system module as described in claim 1, characterized in that, It also includes a test fixture housing; the top of the test fixture housing is provided with two or more test module placement positions and one standard module placement position, so as to place the GPS+BDS dual system test module with the antenna facing down and the GPS+BDS dual system standard module respectively. The GPS+BDS transmitting antenna, interface conversion module, and main control module are located inside the test fixture housing; the GPS+BDS signal generator is located outside the test fixture housing and is connected to the GPS+BDS transmitting antenna via an RF coaxial cable.

9. The test system for the GPS+BDS dual-system module as described in claim 8, characterized in that, The GPS+BDS transmitting antenna maintains a vertical distance of 15-25cm between itself and both the GPS+BDS dual-system test module and the GPS+BDS dual-system standard module.

10. The test system for the GPS+BDS dual-system module as described in claim 8, characterized in that, The bottom of the test fixture box is provided with a base plate; the interface conversion module and the main control module are fixedly mounted on the base plate.

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