Vehicle-mounted GNSS antenna testing device

Abstract

The utility model relates to the technical field of vehicles, and particularly provides a vehicle-mounted GNSS antenna testing device, which comprises a shielding box. The GNSS transmitting antenna, the interference source and the tested GNSS antenna are arranged in the shielding box; the GNSS simulator and the satellite searching module are arranged outside the shielding box; the interference source is used for transmitting an interference signal of the tested GNSS antenna in an actual installation environment; the GNSS simulator is used for transmitting a simulated ephemeris signal, and the simulated ephemeris signal is transmitted out through a transmitting antenna electrically connected in the shielding box; the tested GNSS antenna is electrically connected with the satellite searching module, and the tested GNSS antenna is used for receiving the analog ephemeris signal and transmitting the analog ephemeris signal back to the satellite searching module; the satellite searching module is used for receiving ephemeris signals and calculating satellite searching carrier-to-noise ratios under analog signals of different frequency bands of the GNSS simulator. The whole vehicle detection is brought to subsystem-level part offline verification, the test cost is greatly reduced, the test is carried out in a small shielding box, and the influence of external environment variables on the test result is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field, specifically provide a kind of vehicle GNSS antenna testing device. BACKGROUND

[0002] New energy vehicle electronic device is much more than traditional oil car. Compared with traditional vehicle, new energy vehicle electromagnetic interference is more, and the requirement of antenna anti-interference is also higher and higher. GNSS antenna has increased from the initial navigation function to automatic driving high-precision positioning function, and the performance requirement of antenna is also relatively increased, and the anti-interference ability of GNSS needs to be identified in advance.

[0003] Antenna suppliers have good offline detection means for antenna special characteristic indexes, such as gain, out-of-band suppression, standing wave, voltage and current. After single-piece design verification and product verification electromagnetic interference test, electromagnetic interference in whole vehicle environment is more complex and severe than single-piece electromagnetic interference, which is affected by the distance between vehicle body environment and surrounding parts. When serious, GNSS receives satellite signals in the sky through whole vehicle offline measurement, and the navigation and automatic driving system feedback to navigation and automatic driving system after signal processing by a series of algorithms will appear navigation drift and low high-precision positioning fixed solution rate.

[0004] Correspondingly, a new vehicle GNSS antenna testing device is needed to solve the problem that the existing vehicle GNSS antenna single-piece verification electromagnetic interference test is normal, but is affected by the whole vehicle environment to cause vehicle driving failure. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the above technical problem, i.e. solving the problem that the existing vehicle GNSS antenna single-piece verification electromagnetic interference test is normal, but is affected by the whole vehicle environment to cause vehicle driving failure.

[0006] In the first aspect, the utility model provides a kind of vehicle GNSS antenna testing device, the vehicle GNSS antenna testing device includes shielding box;GNSS transmitting antenna, interference source and measured GNSS antenna are arranged in the shielding box;GNSS simulator and star searching module are arranged outside the shielding box;The interference source is used to emit the interference signal of the measured GNSS antenna in actual installation environment;The GNSS simulator is used to emit analog ephemeris signal, and is electrically connected with the GNSS transmitting antenna in the shielding box, and analog ephemeris signal is emitted by the GNSS transmitting antenna;The measured GNSS antenna and star searching module are electrically connected, and the measured GNSS antenna is used to receive analog ephemeris signal and return analog ephemeris signal to the star searching module;The star searching module is used to receive ephemeris signal and calculate the star searching carrier-to-noise ratio under different frequency band analog signals of the GNSS simulator.

[0007] In the case of adopting the technical scheme, the interference source is used for transmitting the interference signal of the measured GNSS antenna in the actual installation environment, the satellite search carrier-to-noise ratio of each frequency band is sampled in the case of interference and non-interference of the interference source to the measured GNSS antenna, and the satellite search carrier-to-noise ratio in the case of interference and non-interference is compared, so that whether the measured GNSS antenna meets the offline requirement can be finally determined.

[0008] The utility model discloses the whole vehicle detection is brought to the component offline verification of subsystem level, and test is carried out in the small shielding box, avoids the external environmental variable influence test result caused by different weather in the outdoor. Meanwhile, using satellite search module can more directly read the ephemeris numerical value of signal generator output and judge again. Greatly reduce the difficulty of testing, test cost, analysis difficulty and non-repeatability. The problem of poor antenna part is controlled in the component offline detection end, and the convenience, operability and test cost are greatly improved.

[0009] In the optional technical scheme of the vehicle-mounted GNSS antenna testing device, the satellite search module includes a satellite search development board and a satellite search processing unit, the measured GNSS antenna is electrically connected with the satellite search development board, and the satellite search development board is electrically connected with the satellite search processing unit.

[0010] In the case of adopting the technical scheme, the measured GNSS antenna is used for receiving the analog ephemeris signal and returning the analog ephemeris signal to the satellite search development board; the satellite search development board is used for receiving the ephemeris signal and calculating the satellite search carrier-to-noise ratio under the analog signal of different frequency bands of the GNSS simulator through the satellite search software on the satellite search processing unit. The satellite search processing unit is used for monitoring the satellite search of each frequency band of the GNSS antenna, and the interference source on-off carrier-to-noise ratio is convenient for a technician to read.

[0011] In the optional technical scheme of the vehicle-mounted GNSS antenna testing device, the GNSS simulator includes a GNSS signal generator.

[0012] In the case of adopting the technical scheme, the GNSS signal generator is used for transmitting and amplifying the analog ephemeris signal of each frequency band of GNSS, and the GNSS transmitting antenna transmits the analog ephemeris signal to the measured GNSS antenna.

[0013] In the optional technical scheme of the vehicle-mounted GNSS antenna testing device, the GNSS transmitting antenna is a passive wideband antenna.

[0014] In the case of adopting the technical scheme, the passive wideband transmitting antenna has strong resistance to the interference signal and can cover multiple GNSS frequency bands.

[0015] In the optional technical scheme of the vehicle-mounted GNSS antenna testing device, the actual installation environment is that the GNSS antenna to be tested is arranged on a vehicle bench, and a vehicle body structure and an interference source generating an interference signal are arranged on the vehicle bench.

[0016] In the above technical scheme, the vehicle body structure and the interference source generating an interference signal simulate the actual installation environment of the GNSS antenna to be tested.

[0017] In the optional technical scheme of the vehicle-mounted GNSS antenna testing device, the interference source includes a vehicle electronic component and a driving system for operating the vehicle electronic component, and the driving system and the vehicle electronic component are electrically connected.

[0018] In the above technical scheme, the driving system is used to drive the vehicle electronic component to normally work, and different load conditions can be simulated according to actual conditions to generate different interference signals.

[0019] In the optional technical scheme of the vehicle-mounted GNSS antenna testing device, the testing device further includes a control computer, and the driving system and the control computer are electrically connected.

[0020] In the above technical scheme, the control computer is used as a display terminal of the driving system, such as displaying resistance values, current sizes, power and the like.

[0021] In the optional technical scheme of the vehicle-mounted GNSS antenna testing device, the testing device further includes a power module, the power module and the vehicle electronic component are electrically connected, and the power module is used to supply power to the vehicle electronic component.

[0022] In the above technical scheme, the power module is used to power on or power off the electronic component during testing.

[0023] In the optional technical scheme of the vehicle-mounted GNSS antenna testing device, the control computer and the driving system are arranged outside the shielding box.

[0024] In the above technical scheme, the control computer and the driving system are arranged outside the shielding box, so that a technician can conveniently adjust the load box.

[0025] In the optional technical scheme of the vehicle-mounted GNSS antenna testing device, the testing device further includes an error reporting device, the error reporting device is arranged outside the shielding box, and the error reporting device is arranged to remind a technician when the GNSS antenna to be tested does not meet the requirements.

[0026] In the case of adopting the technical scheme, the error reporting device can be a warning light or a voice device, etc., and the warning light or the voice device gives a warning when the measured GNSS antenna is unqualified, so as to facilitate the technician to intuitively distinguish whether the measured GNSS antenna is qualified.

[0027] The skilled in the art can understand that the vehicle-mounted GNSS antenna testing device of the utility model comprises a shielding box, a GNSS transmitting antenna, an interference source and a measured GNSS antenna arranged in the shielding box, a GNSS simulator and a satellite searching module arranged outside the shielding box, the interference source is used for transmitting interference signals of the measured GNSS antenna in the actual installation environment, the GNSS simulator is used for transmitting simulated ephemeris signals and is electrically connected with the GNSS transmitting antenna in the shielding box, the simulated ephemeris signals are transmitted through the GNSS transmitting antenna, the measured GNSS antenna is electrically connected with the satellite searching module, and the measured GNSS antenna is used for receiving the simulated ephemeris signals and transmitting the simulated ephemeris signals back to the satellite searching module, and the satellite searching module is used for receiving the ephemeris signals and calculating the satellite searching carrier-to-noise ratio under the simulated ephemeris signals of different frequency bands.

[0028] In the case of adopting the technical scheme, the interference source is used for simulating the whole vehicle installation environment in which the measured GNSS antenna is actually located, the satellite searching carrier-to-noise ratio of each frequency band is respectively sampled in the case that the interference source interferes with the measured GNSS antenna and does not interfere with the measured GNSS antenna, and whether the measured GNSS antenna meets the offline requirement can be finally determined by comparing the satellite searching carrier-to-noise ratio under the interference and the satellite searching carrier-to-noise ratio under the non-interference.

[0029] The utility model brings the whole vehicle detection to the part offline verification of subsystem level, tests in the small shielding box at the same time, avoids the external environmental variable influence test result caused by different weather outdoors. Meanwhile, the satellite searching module can more intuitively read the ephemeris value output by the GNSS simulator and then judge, greatly reduces the test difficulty, test cost, analysis difficulty and non-repeatability. The problem of the poor antenna part is controlled in the part offline detection end, greatly improves the convenience, operability and reduces the test cost. BRIEF DESCRIPTION OF DRAWINGS

[0030] The preferred embodiments of the utility model will be described below in combination with the drawings, and the drawings are as follows:

[0031] Figure 1 It is the structure schematic diagram of the vehicle-mounted GNSS antenna testing device of the utility model.

[0032] LIST OF REFERENCE NUMERALS

[0033] 1. Control computer; 2. Drive system; 3. Satellite search processing unit; 4. Satellite search development board; 5. Shielding box; 6. Power module; 7. GNSS simulator; 8. GNSS transmitting antenna; 9. GNSS antenna under test; 10. Actual installation environment with interference sources. Detailed Implementation

[0034] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0035] It should be noted that in the description of this utility model, the terms "inner" and "outer", etc., indicating the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0036] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] like Figure 1 As shown, in order to solve the problem that the electromagnetic interference test of the vehicle-mounted GNSS antenna is normal but the vehicle driving failure is caused by the influence of the whole vehicle environment, the vehicle-mounted GNSS antenna test device of this utility model includes a shielded box 5; a GNSS transmitting antenna 8, a GNSS antenna under test 9 and an actual installation environment 10 with interference sources are set in the shielded box 5.

[0038] The GNSS simulator 7 and satellite search module are installed outside the shielded box 5;

[0039] The actual installation environment 10 with interference sources is used to simulate the actual installation environment of the GNSS antenna 9 under test;

[0040] The GNSS simulator 7 is used to transmit simulated ephemeris signals and is electrically connected to the GNSS transmitting antenna 8. The simulated ephemeris signals are transmitted through the GNSS transmitting antenna 8.

[0041] The measured GNSS antenna 9 is electrically connected with the star searching module, and the measured GNSS antenna 9 is used for receiving analog ephemeris signals and returning the analog ephemeris signals to the star searching module.

[0042] The star searching module is used for receiving the ephemeris signals and calculating the star searching carrier-to-noise ratios under the analog ephemeris signals of different frequency bands.

[0043] The GNSS simulator 7 is a device for simulating satellite navigation signals, and different signal waveforms are generated by adjusting parameters such as frequency, amplitude and phase of the signals, so as to simulate the navigation signals of satellites.

[0044] The measured GNSS antenna 9 is used for receiving the ephemeris signals transmitted by the GNSS simulator 7. After the GNSS simulator 7 transmits ephemeris signals of different frequency bands, the measured GNSS antenna 9 receives the ephemeris signals, and then sends the ephemeris signals to the star searching module. After the star searching module receives the ephemeris signals, the star searching carrier-to-noise ratios of each frequency band are output.

[0045] The actual installation environment 10 with interference sources is used for simulating the actual vehicle installation environment of the measured GNSS antenna 9. In the actual installation environment 10 with interference sources, the star searching carrier-to-noise ratios of each frequency band are numerically sampled under the conditions of interference and non-interference of the interference sources in the actual installation environment 10 with interference sources. By comparing the star searching carrier-to-noise ratios under the conditions of interference and non-interference, it can be finally determined whether the measured GNSS antenna 9 meets the offline requirements.

[0046] The utility model brings vehicle detection to the part offline verification of subsystem level, and tests in the small shielding box 5, avoids the external environmental variable influence test result caused by different weather outdoors. Meanwhile, using the star searching module can more directly read the ephemeris values output by the GNSS simulator and then judge, greatly reduces the test difficulty, test cost, analysis difficulty and non-repeatability. The problem of poor antenna parts is controlled in the part offline detection end, greatly improves the convenience, operability and reduces the test cost.

[0047] Specifically, in a possible implementation, the vehicle-mounted GNSS antenna testing device of the utility model comprises a shielding box 5, and a door body for opening and closing the box body is arranged on the shielding box 5. The GNSS transmitting antenna 8, the measured GNSS antenna 9 and the actual installation environment 10 with interference sources are arranged in the box body of the shielding box 5, and the GNSS simulator 7 and the star searching module are arranged outside the shielding box 5 and located at the top of the shielding box 5.

[0048] The GNSS simulator 7 and the GNSS transmitting antenna 8 are electrically connected. Optionally, the GNSS simulator 7 comprises, but is not limited to, a GNSS signal generator for transmitting and amplifying the analog ephemeris signals of each frequency band of GNSS. The GNSS transmitting antenna 8 is used for transmitting the analog ephemeris signals to the measured GNSS antenna 9. The GNSS transmitting antenna 8 is a passive wideband antenna, which has strong resistance to interference signals and can cover multiple GNSS frequency bands.

[0049] The actual installation environment 10 with the interference source comprises a vehicle bench, on which vehicle electronic components, vehicle body structural members and wire harnesses for electrical connection between the components are arranged. The vehicle body structural members and the vehicle electronic components simulate the installation environment where the measured GNSS antenna 9 actually locates.

[0050] The test device further comprises a control computer 1, a driving system 2 and a power module 6 arranged outside the shielding box 5. The vehicle electronic components, the driving system 2, the control computer 1 and the power module 6 are electrically connected. The driving system 2 is used for driving the vehicle electronic components to work. The driving system 2 is provided with a load box, which can simulate different load conditions according to actual conditions. Therefore, the vehicle electronic components electrically connected with the driving system 2 and the surrounding wire harnesses serve as interference sources to generate different interference signals. The power module 6 is used for powering on or powering off the electronic components during the test. The control computer 1 is a display terminal for controlling load parameters of the load box, such as resistance value, current size, power and the like. The driving system 2 can drive the load box to provide power and control signals and the like for the load box to work normally.

[0051] Optionally, the power module 6 is a direct-current power supply. However, the power type of the power module 6 is not limited in the utility model, and those skilled in the art can set it according to needs, which all fall within the protection scope of the utility model.

[0052] The star search module comprises the star search development board 4 and the star search processing unit which are electrically connected. The measured GNSS antenna 9 is electrically connected with the star search development board 4 and the star search processing unit 3. The control computer 1, the driving system 2, the star search processing unit 3 and the star search development board 4 are all located on the top of the shielding box 5. The star search development board 4 is a special device specially used for receiving and processing GNSS antenna star search data. The measured GNSS antenna 9 transmits the received analog ephemeris signals to the star search development board 4; the star search development board 4 receives the ephemeris signals and calculates the star search carrier-to-noise ratio under the analog signals of different frequency bands of the GNSS simulator 7 through the star search software on the star search processing unit 3.

[0053] The developer can use specific software on the search processing unit 3 to write a software program for the search development board 4. The search processing unit 3 also serves as a display terminal for monitoring the search of each frequency band of the measured GNSS antenna 9. The satellite signal data received by the search development board 4 can be transmitted to the search processing unit 3 for storage, and complex analysis and processing of the received satellite data can be performed to provide a user with an intuitive operation interface to interact with the search development board 4.

[0054] By monitoring the search of each frequency band of the measured GNSS antenna 9 through the search processing unit 3, it is convenient for the technician to read the power-on and power-off carrier-to-noise ratios of the interference source on the actual installation environment 10. The carrier-to-noise ratio can be calculated by the search development board 4 in combination with the relevant receiving module and processing algorithm, or by the search processing unit 3 and other devices connected thereto. Those skilled in the art can set it up as needed.

[0055] Optionally, the test device further comprises an error reporting device, which is arranged outside the shielding box and reminds the technician when the measured GNSS antenna does not meet the requirements. Further, the error reporting device can be a warning light or a voice device, etc. Those skilled in the art can set it up as needed.

[0056] In an offline production line or any indoor environment, there are various mechanical and electronic equipment running around. Therefore, in order to avoid the influence of external signals and weather, the entire test bench is placed in a small shielding box 5, thereby improving the consistency and accuracy of the test. By building the surrounding environment of the measured GNSS antenna 9, the real vehicle state is simulated.

[0057] When testing the measured GNSS antenna 9, the GNSS simulator 7 and the wideband transmitting antenna are used to transmit simulated satellite signals to the measured GNSS antenna 9. After the measured GNSS antenna 9 receives the signals, it returns to the search development board 4, and finally the carrier-to-noise ratio is derived from the search processing unit 3 for judgment. By turning on and off the electronic components around the measured GNSS antenna 9, the difference in carrier-to-noise ratio of the GNSS search software before and after the interference is compared to determine whether the anti-interference design of the measured GNSS antenna 9 meets the requirements of the whole vehicle.

[0058] The difference value of the up and down electrical carrier-to-noise ratio exported by the test system is the interference condition of each wave band of the measured GNSS antenna 9, which can reflect the similar situation of outdoor star searching under the whole vehicle environment. The system does not need to be calibrated by complex dynamic test algorithm analysis. In addition, when verifying the measured GNSS antenna of the part, if single piece verification is needed, the gain, axial ratio, out-of-band suppression and the like need to be detected. When verifying on the whole vehicle, it needs to be opened to the outdoor to carry out static and dynamic test by using the real satellite environment in the sky, and then the system algorithm is used to judge whether the final offline meets the requirements. The utility model can simplify the system solving form, and the current carrier-to-noise ratio mode is simulated for final detection by using the intuitive star searching development board 4 on the indoor bench. The test result is also avoided from being affected by the external environment variable caused by different outdoor weather, so that the test difficulty and non-repeatability are greatly reduced.

[0059] In addition, the test system of the utility model is used for identifying the electromagnetic environment immunity level of the measured GNSS antenna 9 installed in the whole vehicle environment in advance, and effectively controlling the offline. After installation to the whole vehicle offline calibration is unqualified, the production line operation needs to be re-opened to the whole vehicle, and the sample is replaced. The unnecessary repair cost caused after the whole vehicle offline can be saved. The whole vehicle production line problem is brought to the part production line, which is easier to analyze and solve.

[0060] In addition, although the GNSS transmitting antenna 8 is a passive wideband antenna in the embodiment, it is not intended to limit the specific type of the GNSS transmitting antenna, for example, it can also be an active antenna, a microstrip antenna, a single-frequency antenna or a multi-frequency antenna and the like, which can be set by the person skilled in the art as needed, and all fall within the protection scope of the utility model.

[0061] As described in the first paragraph of this section, the above embodiment is only used to illustrate the principle of the utility model, and is not intended to limit the protection scope of the utility model. Under the condition of not deviating from the principle of the utility model, the person skilled in the art can adjust the above structure, so that the utility model can be applied to more specific application scenarios.

[0062] So far, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but the person skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Under the condition of not deviating from the principle of the utility model, the person skilled in the art can make equivalent changes or replacements to the related technical features, and the technical scheme after the changes or replacements will fall within the protection scope of the utility model.

Claims

1. A vehicle-mounted GNSS antenna testing device, characterized in that, Including shielding boxes; The GNSS transmitting antenna, the interference source, and the GNSS antenna under test are installed inside the shielding box. The GNSS simulator and satellite search module are located outside the shielded box; The interference source is used to transmit interference signals from the GNSS antenna under test in the actual installation environment; The GNSS simulator is used to transmit simulated ephemeris signals and is electrically connected to the GNSS transmitting antenna inside the shielded box. The simulated ephemeris signals are transmitted through the GNSS transmitting antenna. The GNSS antenna under test is electrically connected to the satellite search module. The GNSS antenna under test is used to receive simulated ephemeris signals and transmit the simulated ephemeris signals back to the satellite search module. The satellite search module is used to receive ephemeris signals and calculate the satellite search carrier-to-noise ratio under different frequency bands of simulated signals in the GNSS simulator.

2. The vehicle-mounted GNSS antenna testing device according to claim 1, characterized in that, The satellite search module includes a satellite search development board and a satellite search processing unit. The GNSS antenna under test is electrically connected to the satellite search development board, and the satellite search development board is electrically connected to the satellite search processing unit.

3. The vehicle-mounted GNSS antenna testing device according to claim 1, characterized in that, The GNSS simulator includes a GNSS signal generator.

4. The vehicle-mounted GNSS antenna testing device according to claim 1, characterized in that, The GNSS transmitting antenna is a passive broadband antenna.

5. The vehicle-mounted GNSS antenna testing device according to claim 1, characterized in that, The actual installation environment is that the GNSS antenna under test is set on a vehicle chassis, which also contains vehicle body structural components and interference sources that generate interference signals.

6. The vehicle-mounted GNSS antenna testing device according to claim 5, characterized in that, The interference source includes vehicle electronic components and a drive system that enables the vehicle electronic components to operate, and the drive system and the vehicle electronic components are electrically connected.

7. The vehicle-mounted GNSS antenna testing device according to claim 6, characterized in that, The testing device also includes a control computer, and the drive system and the control computer are electrically connected.

8. The vehicle-mounted GNSS antenna testing device according to claim 6, characterized in that, The testing device also includes a power module, which is electrically connected to the vehicle electronic components and is used to supply power to the vehicle electronic components.

9. The vehicle-mounted GNSS antenna testing device according to claim 7, characterized in that, The control computer and the drive system are located outside the shielded box.

10. The vehicle-mounted GNSS antenna testing device according to claim 1, characterized in that, The testing device also includes an error reporting device, which is located outside the shielding box and is configured to alert technicians when the GNSS antenna under test does not meet the requirements.

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