A vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device and its operation method

Abstract

The present invention discloses a vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device and its operation method, the device includes a signal receiving and processing host and a GNSS high-precision measurement antenna electrically connected to the signal receiving and processing host, an anti-interference and RDSS integrated antenna, and a vehicle-mounted industrial control computer. The device disclosed in the present invention is equipped with an anti-interference and RDSS integrated antenna, which can realize Beidou short message reception and transmission and communication service performance detection, and at the same time integrates an anti-interference module. Even if it works in a complex electromagnetic environment with GNSS interference, it can ensure that the vehicle's own positioning is not affected during driving, and realize GNSS service performance monitoring within a wide spatial range.

Description

Technical Field

[0001] The present invention belongs to the research field of satellite navigation service performance monitoring and anti-interference technology, and particularly relates to a vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device and an operation method thereof in the field. Background Art

[0002] Satellite navigation system is an important infrastructure, a basic means of obtaining position, velocity and time (PNT) information, and the basis for location-based applications. It has been widely used in national defense, disaster relief and reduction, banking and finance, communications, energy, water conservancy, transportation, surveying and mapping, public health and other fields. How to quickly and accurately locate interference and how to monitor GNSS service performance are urgent issues to be solved in this field. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device and an operation method thereof.

[0004] The present invention adopts the following technical solution: A vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device, the improvement of which lies in: comprising a signal receiving and processing host and a GNSS high-precision measurement antenna, an anti-interference and RDSS integrated antenna, and a vehicle-mounted industrial control computer electrically connected to the signal receiving and processing host; the signal receiving and processing host comprises a main control module, a GNSS high-precision measurement board card, a Beidou civilian dual-template card, a filtering module and a power module, the GNSS high-precision measurement antenna is electrically connected to the GNSS high-precision measurement board card, the anti-interference and RDSS integrated antenna is electrically connected to the Beidou civilian dual-template card, the GNSS high-precision measurement board card and the Beidou civilian dual-template card are electrically connected to the main control module, the main control module is connected to the vehicle-mounted industrial control computer for communication, an external power supply is electrically connected to the power module through the filtering module, and the power module supplies power to the signal receiving and processing host.

[0005] Furthermore, the anti-interference and RDSS integrated antenna is divided into 4 layers, and the spaces between the layers are independent and isolated, and from top to bottom they are the antenna layer, the anti-interference layer, the power amplifier layer and the power supply layer; The antenna layer includes an antenna array and a low-noise amplifier component. The antenna array includes 1 L-band antenna element, 4 B1-band antenna elements, 4 B3-band antenna elements, 1 B2b-band antenna element and 1 S-band antenna element. The low-noise amplifier component includes 10 signal inputs, 10 signal outputs and 1 5V power input. The antenna array sends B1, B3, B2b and S signals to the low-noise amplifier component. After the low-noise amplifier component completes signal amplification, it sends B1 and B3 signals to the following anti-interference module, and sends B2b and S signals to the following multiplexer. The anti-interference layer is an anti-interference module with a 5V power input. After the anti-interference module completes the anti-interference processing of the B1 and B3 signals, it sends them to the following multiplexer in the form of RF signals; The power amplifier layer includes a cavity filter, a power amplifier and a multiplexer. The power amplifier has a 28V power input. The power amplifier inputs the L-band signal from the multiplexer and then outputs it to the cavity filter. The cavity filter filters and sends it to the L-band antenna element of the above antenna array. The multiplexer completes signal synthesis and L, S, B3, B2b, and B1 frequency band signal transmission. The multiplexer is electrically connected to the following RDSS RF module; The power layer includes the RDSS RF module, aviation socket and power module. The RDSS RF module communicates with the Beidou civil dual-template card through an RF cable. The aviation socket supplies power to the power module and communicates with the power amplifier and anti-interference module. The power module supplies power to the power amplifier, anti-interference module and low-noise amplifier components.

[0006] Furthermore, the antenna array uses a disc-shaped antenna with a diameter of 260 mm. Four B3 frequency array elements are evenly distributed at the outermost periphery of the disc at 90 degrees, four B1 frequency array elements are evenly distributed at the second outer periphery of the disc at 90 degrees, and one S, B2b, L compatible frequency stacked array element is located at the center of the disc.

[0007] Furthermore, the low noise amplifier component adopts two-stage filtering and three-stage amplification.

[0008] Furthermore, the anti-interference module includes an RF down-conversion unit, an RF up-conversion unit, an analog-to-digital conversion unit, a digital baseband chip, a digital-to-analog conversion unit, an embedded processor and a power supply circuit; the RF down-conversion unit adopts a four-channel anti-interference RF chip, the analog-to-digital conversion unit adopts two pieces of 4-channel 16-bit high-speed acquisition, the clock distribution circuit of the analog-to-digital conversion unit is powered by a low voltage difference regulator, the digital-to-analog conversion unit adopts a single-channel 14-bit high-speed acquisition, and the power supply circuit adopts a single-chip 4-channel DC-DC.

[0009] A method of operation is applicable to the above-mentioned device, and the improvement thereof lies in that: the reception of GNSS signals is realized by a GNSS high-precision measurement antenna; the anti-interference and RDSS integrated antenna has the ability to resist broadband and narrowband suppression interference of Beidou B1 and B3 frequency points, and has the function of sending and receiving RDSS short messages; the main control module is responsible for controlling the information reception and configuration of the GNSS high-precision measurement board and the Beidou civil dual-template card, and the secondary processing of the received data, so as to realize ionospheric scintillation monitoring; the GNSS high-precision measurement board realizes the reception and solution of GNSS multi-mode and multi-frequency navigation signals, realizes the output of time and positioning information and original navigation information, and uses the output information to realize the monitoring of GNSS navigation service performance and ionospheric scintillation monitoring; the Beidou civil dual-template card is used to realize the reception and solution of Beidou GNSS navigation signals, realizes the output of time and positioning information and original navigation information, and realizes the sending and receiving of RDSS civil signals; the power supply module transforms the external input 24VDC power supply and supplies power to the main control module, the GNSS high-precision measurement board and the Beidou civil dual-template card respectively, and the filter module is used to filter the external power supply.

[0010] The beneficial effects of the present invention are: The device disclosed in the present invention can receive and process public service signals of GNSS systems such as GPS, GLONASS, BDS, Galileo, etc., and supports the output of original observation quantities such as pseudorange, carrier phase, Doppler and carrier-to-noise ratio, as well as information such as navigation messages, satellite numbers, elevation angles, azimuth angles, positioning results, the number of available satellites, and DOP values. The comprehensive service performance of each GNSS system can be evaluated based on the above information, and the ionospheric scintillation that affects the GNSS performance can be monitored based on the original observation quantities output by the GNSS high-precision measurement board.

[0011] The device disclosed in the present invention is equipped with an anti-interference and RDSS integrated antenna, which can realize Beidou short message reception and transmission and communication service performance detection, and at the same time integrates an anti-interference module. Even if it works in a complex electromagnetic environment with GNSS interference, it can ensure that the vehicle's own positioning is not affected during driving, thereby realizing GNSS service performance monitoring in a wide spatial range.

[0012] Traditional GNSS service performance monitoring devices are mostly used for fixed station monitoring, while the device disclosed in the present invention can be mounted on a vehicle, effectively solving the problem of poor GNSS service performance monitoring in dynamic mode. It also has RDSS service performance monitoring and ionospheric scintillation monitoring functions, meeting users' multi-dimensional monitoring needs.

[0013] The device disclosed in the present invention has high integration, strong mobility, and convenient deployment, is convenient for daily use and maintenance, and can also be customized according to user needs to achieve personalized configuration.

[0014] The operating method disclosed in the present invention can monitor the GNSS service performance, RDSS service performance, and ionospheric scintillation in real time, immediately issue an alarm when an abnormality is found, and report the abnormal situation to the central system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a block diagram of the composition of the device disclosed in the present invention; Figure 2 It is a block diagram of the signal receiving and processing host in the device disclosed in the present invention; Figure 3 It is a schematic diagram of the hierarchical structure of the anti-interference and RDSS integrated antenna in the device disclosed in the present invention; Figure 4 It is a principle block diagram of the anti-interference module in the device disclosed in the present invention; Figure 5 It is a principle block diagram of the RDSS radio frequency module in the device disclosed in the present invention; Figure 6 It is a process flow chart of the software. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] Embodiment 1, this embodiment discloses a vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device, which can realize the monitoring of multi-mode and multi-frequency satellite navigation service performance such as BDS, GPS, GLONASS, Galileo, ionospheric scintillation monitoring, and realize the transmission, reception and service performance monitoring of Beidou RDSS signals, and can also realize the anti-interference and anti-spoofing positioning function of B1 and B3 frequency points. Figure 1 As shown, it includes a signal receiving and processing host and a GNSS high-precision measurement antenna electrically connected to the signal receiving and processing host, an anti-interference and RDSS integrated antenna, a vehicle-mounted industrial computer and supporting cables; Figure 2As shown, the signal receiving and processing host includes a main control module, a GNSS high-precision measurement board, a Beidou civil dual-template card, a filtering module and a power module. The GNSS high-precision measurement antenna is electrically connected to the GNSS high-precision measurement board, the anti-interference and RDSS integrated antenna is electrically connected to the Beidou civil dual-template card, the GNSS high-precision measurement board and the Beidou civil dual-template card are electrically connected to the main control module, the main control module receives GNSS original observation data and navigation message information, further analyzes and solves the data, and realizes the monitoring of ionospheric scintillation. The main control module is connected to communicate with the on-board industrial computer, the external power supply is electrically connected to the power module through the filtering module, and the power module supplies power to the signal receiving and processing host.

[0018] The device can be mounted on a vehicle platform or used alone. It can receive various GNSS satellite navigation signals and output original observation data, navigation messages and other information to realize GNSS service performance monitoring and ionospheric scintillation monitoring. It is equipped with an anti-interference and RDSS integrated antenna to realize Beidou regional short message service monitoring and RDSS communication functions. It has the ability to resist wide / narrowband interference. When the GNSS satellite navigation signal is interfered with, it can still realize its own navigation positioning, speed measurement and timing functions.

[0019] The device is easy to operate and highly automated. It adopts integrated design in many places and is small in size and light in weight. It can carry out GNSS service performance monitoring in complex electromagnetic environments while ensuring that it is not interfered with. It can synchronously monitor ionospheric scintillation through the output data of the GNSS board. The anti-interference antenna and RDSS antenna adopt an integrated design, and have the ability to resist broadband / narrowband suppression interference, RDSS service performance detection and transceiver capabilities.

[0020] The GNSS high-precision measurement antenna interface adopts TNC-K type interface, which can cover GPSL1 / L2 / L5, GLONASSG1 / G2 / G3, BDSB1 / B2 / B3, Galileo E1 / E5 working frequency points, and realize the reception of GPS, GLONASS, BDS, Galileo and other GNSS signals. It has the superior performance of phase center and mechanical center coincidence, small size, light weight, easy to carry and install.

[0021] In order to realize the integration of anti-interference antenna and RDSS antenna and ensure their full performance, good transceiver isolation is an important guarantee. Only by achieving good transceiver isolation can the multi-frequency parallel working capability of anti-interference and RDSS integrated antenna be guaranteed. The working frequencies of anti-interference and RDSS integrated antenna include B1, B2, B3, L (Beidou short message uplink working frequency band), S (Beidou short message downlink working frequency band). Cavity filters are installed at the B1 frequency and L frequency to meet the application requirements of transceiver isolation. It is successfully achieved that while the L signal is transmitted, the B1I signal maintains continuous tracking without carrier loss of lock and cycle slip.

[0022] like Figure 3 As shown in the figure, the anti-interference and RDSS integrated antenna adopts a layered design and is divided into 4 layers. The spaces between the layers are independent and isolated. From top to bottom, they are the antenna layer, the anti-interference layer, the power amplifier layer, and the power supply layer. The antenna layer includes an antenna array and a low-noise amplifier component. The antenna array includes 1 L-band antenna element, 4 B1-band antenna elements, 4 B3-band antenna elements, 1 B2b-band antenna element and 1 S-band antenna element. The low-noise amplifier component includes 10 signal inputs, 10 signal outputs and 1 5V power input. The antenna array sends B1, B3, B2b and S signals to the low-noise amplifier component. After the low-noise amplifier component completes signal amplification, it sends B1 and B3 signals to the following anti-interference module, and sends B2b and S signals to the following multiplexer. The antenna array is at the top of the anti-interference and RDSS integrated antenna, and is a very important component of the anti-interference and RDSS integrated antenna. The antenna array uses a 260mm diameter disc-shaped antenna, with 4 B3 frequency array elements evenly distributed at 90 degrees on the outermost periphery of the disc, 4 B1 frequency array elements evenly distributed at 90 degrees on the second outer periphery of the disc, and 1 S, B2b, L compatible frequency stacked array element located at the center of the disc. It can achieve Beidou B1 and B3 frequency anti-interference and RDSS transmission and reception.

[0023] The low noise amplifier component adopts two-stage filtering and three-stage amplification. The BDS B1 / B3 satellite signal is first pre-filtered, then low-noise amplified by the first-stage LNA, and then amplified by the second-stage LNA and the final amplifier after high suppression filtering before output.

[0024] The anti-interference layer is an anti-interference module with 1 5V power input. The anti-interference module completes the anti-interference function. The module supports 4 B1 band analog signal inputs, 4 B3 band analog signal inputs, 1 B1 band RF signal output, 1 B3 band RF signal output and 2 232 communication serial ports. After the anti-interference module completes the anti-interference processing of B1 and B3 signals, it sends them to the following multiplexer in the form of RF signals; The anti-interference module mainly completes the broadband anti-interference processing function of the B3 frequency band and the B1 frequency band. The entire module consists of the B3 frequency band anti-interference submodule and the B1 frequency band anti-interference submodule. Figure 4 As shown in the figure, the processing process mainly includes RF down-conversion, up-conversion, analog-to-digital conversion (ADC), digital baseband chip, digital-to-analog conversion (DAC), embedded processor (ARM) and power supply and other peripheral circuits; RF down-conversion uses a four-channel anti-interference RF chip, which realizes the down-conversion and amplification of the same four 1.15GHz~2.5GHz frequency band RF signals. The anti-interference baseband chip is a new generation of anti-interference processing baseband chip with a built-in 600MHz high-performance floating-point processor. It can not only perform anti-interference processing on navigation information, but also estimate the number, direction and power intensity of interference. The chip adopts low-power technology with a typical power consumption of 3~6W. The ADC adopts 2 pieces of 4-channel 16bit high-speed acquisition, the ADC clock distribution circuit is powered by a low-voltage difference regulator, the DAC adopts a single-channel 14bit high-speed acquisition, and the power supply circuit adopts a single-chip 4-channel DC-DC. The anti-interference module can be configured through the serial port, and the anti-interference baseband unit will configure other units through the serial interface.

[0025] The power amplifier layer includes a cavity filter, a power amplifier and a multiplexer. The power amplifier has a 28V power input. The power amplifier inputs the L-band signal from the multiplexer and then outputs it to the cavity filter. The cavity filter filters and sends it to the L-band antenna element of the above antenna array. The multiplexer completes signal synthesis and L, S, B3, B2b, and B1 frequency band signal transmission. The multiplexer is electrically connected to the following RDSS RF module; The power layer includes the RDSS RF module, aviation socket (input and output interface) and power module. The RDSS RF module communicates with the Beidou civil dual-template card through an RF cable. The aviation socket supplies power to the power module and communicates with the power amplifier and anti-interference module. The power module supplies power to the power amplifier, anti-interference module and low-noise amplifier components.

[0026] like Figure 5 As shown in the figure, in order to ensure that the Beidou terminal's transceiver antennas do not affect each other, a cavity filter is designed in the RDSS transmission circuit to improve the out-of-band suppression performance. At the same time, a narrowband filter is added to the B1 frequency antenna to prevent it from being affected by the RDSS transmission signal. The power amplifier amplifies the signal transmitted by the short message to realize the short message transceiver function. The working mode is to turn on the switch-controlled amplifier with a 28V power supply. At the same time, the cavity filter, the voltage-regulated isolation power supply, and the power supply EMI filter are integrated.

[0027] The GNSS high-precision measurement board of the signal receiving and processing host is mainly used to realize baseband processing and positioning solution. The baseband processing receives the public service navigation signal broadcast by the navigation satellite within the field of view, completes the pseudo-range measurement, carrier phase measurement, Doppler measurement, and demodulates the navigation message parameters. The measurement value and the message result are sent to the main control module in the form of a data stream. The positioning solution can realize functions such as single frequency, multi-frequency combination, and multi-mode simultaneous solution. The Beidou civil dual template card has the function of receiving BDS B1I, B1C, B2a, B2b, B3I, B3Q, S1I, S1Q, S2C, and S2A signal components. After processing, it generates pseudo-range observations, carrier phase observations, and original observations such as messages and ephemeris for positioning and message reception processing. The main control module consists of two components: the core board and the baseboard. The core board adopts a 4-core Cortex-A7 architecture, with a main frequency of up to 1.2GHz per core, an integrated GPU, 1GB DDR3L memory, and 8GB eMMC storage. The main control module is mainly responsible for completing tasks such as information processing, data storage, and interface management. It communicates and transmits data with the dedicated software running on the vehicle-mounted industrial computer through the serial port or network port, and saves the data on a local large-capacity SD card.

[0028] The dedicated software running on the vehicle-mounted industrial computer mainly completes the service performance monitoring and abnormal alarm of GNSS systems such as Beidou, GPS, GLONASS, Galileo, and completes the management, control and display of navigation signals and ionospheric scintillation monitoring. It mainly includes data receiving and pushing module, real-time monitoring module, post-statistical analysis module, abnormal monitoring module and visualization submodule, a total of five modules.

[0029] The data receiving and pushing module receives the original observation data and equipment status information of navigation signals and ionospheric scintillation monitoring through the TCP network protocol, and parses and verifies the acquired data, and then stores the parsed original observation data and equipment status information. The original observation data, equipment status information, business processing data, etc. are pushed to the data transmission module in the specified way, specified content, and specified protocol.

[0030] The real-time monitoring module monitors the satellite health status, number of visible satellites, DOP value, carrier-to-noise ratio, positioning, speed measurement, communication and other performance of GNSS systems such as Beidou, GPS, GLONASS and Galileo in real time.

[0031] The post-analysis module processes and analyzes the observation data of positioning, speed measurement, communication, etc. of GNSS systems such as Beidou, GPS, GLONASS, and Galileo, and completes the post-statistical analysis function of performance.

[0032] Abnormal monitoring module: This module is mainly used for abnormal monitoring and alarm of real-time monitoring and post-statistical analysis content.

[0033] The visualization module makes comprehensive use of 2D and 3D visualization technologies to display the satellite navigation system application verification analysis and evaluation results in a three-dimensional, intuitive and comprehensive manner. The visualization content includes parameter configuration, visualization of all monitoring elements, visualization of user performance, visualization of abnormal analysis results, etc.

[0034] The software receives the business data and status information of the vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device through the data distribution service. After receiving the data for analysis and validity verification, it performs real-time monitoring and processing, and issues alarms for abnormal situations. At the same time, it can extract historical data to conduct post-statistical analysis on the positioning, speed measurement, and communication performance of GNSS systems such as Beidou, GPS, GLONASS, and Galileo. All business data, status information, and monitoring data are stored, and selectively displayed and pushed to the data transmission module according to user needs. The specific processing flow is as follows: Figure 6 shown.

[0035] The present embodiment also discloses an operation method, which is applicable to the above-mentioned device, and realizes the reception of GNSS signals through the GNSS high-precision measurement antenna; the anti-interference and RDSS integrated antenna has the ability to resist broadband and narrowband suppression interference of Beidou B1 and B3 frequency points. According to the RDSS communication and detection requirements, the RDSS transceiver antenna array is integrated in the anti-interference and RDSS integrated antenna to realize the RDSS short message receiving and sending function; the main control module is responsible for controlling the information reception and configuration of the GNSS high-precision measurement board and the Beidou civil dual-template card, and the secondary processing of the received data to realize ionospheric scintillation monitoring; the GNSS high-precision measurement board realizes the G The NSS multi-mode and multi-frequency navigation signals are received and resolved to output the time and positioning information as well as the original navigation information, and the output information is used to monitor the GNSS navigation service performance and ionospheric scintillation. The Beidou civil dual-template card is used to receive and resolve the Beidou GNSS navigation signals to output the time and positioning information as well as the original navigation information, and to send and receive the RDSS civil signals. The power module transforms the external 24VDC power supply and supplies power to the main control module, the GNSS high-precision measurement board and the Beidou civil dual-template card respectively. The filter module is used to filter the external power supply to ensure that the electromagnetic compatibility performance meets the requirements.

Claims

1. A vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device, characterized in that: It includes a signal receiving and processing host and a GNSS high-precision measurement antenna, an anti-interference and RDSS integrated antenna, and a vehicle-mounted industrial computer electrically connected to the signal receiving and processing host; the signal receiving and processing host includes a main control module, a GNSS high-precision measurement board card, a Beidou civilian dual-template card, a filtering module and a power module, the GNSS high-precision measurement antenna is electrically connected to the GNSS high-precision measurement board card, the anti-interference and RDSS integrated antenna is electrically connected to the Beidou civilian dual-template card, the GNSS high-precision measurement board card and the Beidou civilian dual-template card are electrically connected to the main control module, the main control module is connected to the vehicle-mounted industrial computer for communication, the external power supply is electrically connected to the power module through the filtering module, and the power module supplies power to the signal receiving and processing host.

2. The vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device according to claim 1, characterized in that: The anti-interference and RDSS integrated antenna is divided into 4 layers, and the spaces between the layers are independent and isolated, from top to bottom, they are antenna layer, anti-interference layer, power amplifier layer and power supply layer; The antenna layer includes an antenna array and a low-noise amplifier assembly. The antenna array includes 1 L-band antenna element, 4 B1-band antenna elements, 4 B3-band antenna elements, 1 B2b-band antenna element and 1 S-band antenna element. The low noise amplifier component includes 10 signal inputs, 10 signal outputs, and 1 5V power input. The antenna array sends the B1, B3, B2b, and S signals to the low noise amplifier component. After the low noise amplifier component completes signal amplification, it sends the B1 and B3 signals to the following anti-interference module, and sends the B2b and S signals to the following multiplexer; The anti-interference layer is an anti-interference module with a 5V power input. After the anti-interference module completes the anti-interference processing of the B1 and B3 signals, it sends them to the following multiplexer in the form of RF signals; The power amplifier layer includes a cavity filter, a power amplifier and a multiplexer. The power amplifier has a 28V power input. The power amplifier inputs the L-band signal from the multiplexer and then outputs it to the cavity filter. The cavity filter filters and sends it to the L-band antenna element of the above antenna array. The multiplexer completes signal synthesis and L, S, B3, B2b, and B1 frequency band signal transmission. The multiplexer is electrically connected to the following RDSS RF module; The power layer includes the RDSS RF module, aviation socket and power module. The RDSS RF module communicates with the Beidou civil dual-template card through an RF cable. The aviation socket supplies power to the power module and communicates with the power amplifier and anti-interference module. The power module supplies power to the power amplifier, anti-interference module and low-noise amplifier components.

3. The vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device according to claim 2 is characterized in that: The antenna array uses a disc-shaped antenna with a diameter of 260mm. The four B3 frequency array elements are evenly distributed at the outermost periphery of the disc at 90 degrees, the four B1 frequency array elements are evenly distributed at the second outer periphery of the disc at 90 degrees, and one S, B2b, and L compatible frequency stacked array element is located at the center of the disc.

4. The vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device according to claim 2, characterized in that: The low noise amplifier component adopts two-stage filtering and three-stage amplification.

5. The vehicle-mounted GNSS service performance monitoring and anti-interference positioning integrated device according to claim 2, characterized in that: The anti-interference module includes an RF down-conversion unit, an RF up-conversion unit, an analog-to-digital conversion unit, a digital baseband chip, a digital-to-analog conversion unit, an embedded processor and a power supply circuit; the RF down-conversion unit adopts a four-channel anti-interference RF chip, the analog-to-digital conversion unit adopts two pieces of 4-channel 16-bit high-speed acquisition, the clock distribution circuit of the analog-to-digital conversion unit is powered by a low-voltage difference regulator, the digital-to-analog conversion unit adopts a single-channel 14-bit high-speed acquisition, and the power supply circuit adopts a single-chip 4-channel DC-DC.

6. An operating method, applicable to the device according to claim 1, characterized in that: GNSS signals are received through the GNSS high-precision measurement antenna; the anti-interference and RDSS integrated antenna has the ability to resist broadband and narrowband suppression interference at the Beidou B1 and B3 frequency points, and has the function of sending and receiving RDSS short messages; the main control module is responsible for controlling the information reception and configuration of the GNSS high-precision measurement board and the Beidou civil dual-template card, as well as the secondary processing of the received data to realize ionospheric scintillation monitoring; The GNSS high-precision measurement board realizes the reception and solution of GNSS multi-mode and multi-frequency navigation signals, and outputs the time and positioning information as well as the original navigation information. The output information is used to monitor the GNSS navigation service performance and ionospheric scintillation. The Beidou civil dual-template card is used to receive and solve the Beidou GNSS navigation signals, output the time and positioning information as well as the original navigation information, and send and receive the RDSS civil signals. The power module transforms the external input 24VDC power supply and supplies power to the main control module, the GNSS high-precision measurement board and the Beidou civil dual-template card respectively. The filter module is used to filter the external power supply.

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