Integrated vehicle-mounted beidou-3 positioning system

Abstract

The utility model provides an integral type vehicle -mounted big dipper no.3 positioning system, it has solved big dipper positioning system multi -frequency point signal reception etc problem, it includes antenna and radio frequency front end subassembly, antenna and radio frequency front end subassembly are connected with signal information processing and interface subassembly, antenna and radio frequency front end subassembly and signal information processing and interface subassembly are connected with power module, signal information processing and interface subassembly are connected with comprehensive cable, antenna and radio frequency front end subassembly have passive omnidirectional antenna and radio frequency front end, and radio frequency front end is equipped with cavity wave filter. The utility model has stable structure, signal transmission effect is good and so on.

Description

Technical Field

[0001] This utility model belongs to the field of positioning system technology, specifically relating to an integrated vehicle-mounted Beidou-3 positioning system. Background Technology

[0002] The BeiDou Navigation Satellite System is a global satellite navigation system independently developed by my country. Its third generation (BeiDou-3) has achieved significant improvements in signal coverage, positioning accuracy, and service capabilities. As core equipment for intelligent transportation and military logistics support, vehicle-mounted positioning systems place higher demands on multi-mode navigation, high reliability, and anti-interference capabilities. However, most existing BeiDou vehicle-mounted systems suffer from insufficient frequency band compatibility, weak anti-interference design, and low hardware integration.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed a variety of solutions. For example, Chinese patent document discloses a vehicle-mounted Beidou locator [201911290821.2], which includes a base plate and a top plate. The upper part of the base plate has a storage slot, and an irregularly shaped rotating shaft and a buzzer are installed in the storage slot. The upper end of the irregularly shaped rotating shaft passes through a through hole opened above the storage slot and is rotatably connected to the top plate. A first metal block is provided on one side of the irregularly shaped rotating shaft. The first metal block is connected to one end of a battery through a connecting wire. The two sides of the first metal block opposite to the end face where the irregularly shaped rotating shaft is installed are connected and fixed to a reset device. The side of the reset device opposite to the first metal block is fixedly connected to a baffle. A second metal block is provided between the two reset devices. One end of the second metal block is attached to the baffle. The second metal block is connected to the buzzer through the baffle through a connecting wire. The buzzer is connected to one end of the battery through the baffle through a connecting wire. A rectangular groove is provided in the middle of the base plate. Four Velcro straps are fixedly connected in a grid pattern on the bottom surface of the rectangular groove. An annular groove is provided on the outside of the rectangular groove. Four screw holes are symmetrically provided on both sides of the annular groove. Two screw holes are provided on one side of the top plate.

[0004] The above solution has solved the problem of structural stability of vehicle positioning system to a certain extent, but it still has many shortcomings, such as the inability to receive signals at multiple frequencies. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed integrated vehicle-mounted BeiDou-3 positioning system that can receive signals at multiple frequencies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an integrated vehicle-mounted Beidou-3 positioning system, including an antenna and a radio frequency front-end assembly, the antenna and radio frequency front-end assembly being connected to a signal information processing and interface assembly, the antenna and radio frequency front-end assembly and the signal information processing and interface assembly being connected to a power module, the signal information processing and interface assembly being connected to a comprehensive cable, the antenna and radio frequency front-end assembly having a passive omnidirectional antenna and a radio frequency front-end, the radio frequency front-end being equipped with a cavity filter.

[0007] In the aforementioned integrated vehicle-mounted BeiDou-3 positioning system, the passive omnidirectional antenna includes an S antenna, an L antenna, a B1 antenna, and B2 / B3 antennas.

[0008] In the aforementioned integrated vehicle-mounted BeiDou-3 positioning system, the S antenna is placed at the center of the passive omnidirectional antenna, the B1 and L antennas adopt a microstrip antenna design, and the B2 / B3 antennas adopt a microstrip antenna design.

[0009] In the aforementioned integrated vehicle-mounted BeiDou-3 positioning system, the front-end components include a low-noise amplifier circuit connected to the S antenna, B1 antenna, and B2 / B3 antenna. The low-noise amplifier circuit is connected to a receiver combiner. The L antenna is connected to a power amplifier circuit and a filter amplifier circuit. The power amplifier circuit and the filter amplifier circuit are connected to a power amplifier control switch.

[0010] In the aforementioned integrated vehicle-mounted BeiDou-3 positioning system, a B1 cavity filter is connected between the B1 antenna and the low-noise amplifier circuit, and an L cavity filter is connected between the L antenna and the power amplifier circuit.

[0011] In the aforementioned integrated vehicle-mounted BeiDou-3 positioning system, the signal information processing and interface components include a navigation radio frequency circuit, a navigation baseband circuit, and an interface processing circuit. The navigation radio frequency circuit receives RF signals from the receiving combiner through a navigation power divider circuit, transmits RF signals from the filtering amplifier circuit through a transmitting filter amplifier circuit, and the navigation baseband circuit is connected to a timing processing circuit.

[0012] In the aforementioned integrated vehicle-mounted BeiDou-3 positioning system, the power module includes a 5V power circuit connected to the signal information processing and interface components, a 28V power circuit connected to the power amplifier control switch, and the 28V power circuit connected to the integrated cable through an input filter circuit. The 5V power circuit and the 28V power circuit are connected to an input protection circuit.

[0013] In the aforementioned integrated vehicle-mounted BeiDou-3 positioning system, the power module has a DC-DC switching regulator chip N2, which is equipped with linear regulators N1, N3-N6.

[0014] In the aforementioned integrated vehicle-mounted BeiDou-3 positioning system, the positioning system is installed inside the main unit, which is enclosed by a bottom shell and an antenna cover. The passive omnidirectional antenna is fastened to the upper part of the bottom shell by stainless steel combination screws, and the bottom shell is equipped with a waterproof and breathable valve.

[0015] In the aforementioned integrated vehicle-mounted BeiDou-3 positioning system, integrated cables and interface sockets are connected together.

[0016] Compared with existing technologies, the advantages of this utility model are as follows: the passive omnidirectional antenna integrates multiple antenna arrays of different specifications, which can complete the wireless radio frequency transmission and reception of satellite signals of the Beidou multi-generation positioning system; the signal information processing and interface components cover RNSS signal reception, RDSS signal reception and transmission, global short message signal reception and transmission, RNSS navigation, positioning and timing, RDSS service functions, global short message service and other functions; the power module has automatic protection functions in case of overcurrent, overvoltage, undervoltage or accidental polarity reversal, and has internal data power-off protection function after the device is disconnected from the power supply. Attached Figure Description

[0017] Figure 1 This is a structural block diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the antenna and radio frequency front-end assembly of this utility model;

[0019] Figure 3 This is a schematic diagram of the main unit of this utility model;

[0020] Figure 4 This is a circuit diagram of the power module of this utility model;

[0021] In the diagram, the components are: 1. Antenna and RF front-end assembly; 11. S-antenna; 12. L-antenna; 13. B1 antenna; 14. B2 / B3 antenna; 15. Low-noise amplifier circuit; 16. Receiver combiner; 17. Power amplifier circuit; 18. Filter amplifier circuit; 19. Power amplifier control switch; 2. Signal information processing and interface assembly; 21. Navigation RF circuit; 22. Navigation baseband circuit; 23. Interface processing circuit; 24. Navigation power divider circuit; 25. Transmitter filter amplifier circuit; 26. Timing processing circuit; 3. Power module; 31. 5V power supply circuit; 32. 28V power supply circuit; 33. Input filter circuit; 34. Input protection circuit; 4. Integrated cable; 5. B1 cavity filter; 6. L-cavity filter; 7. Main unit; 71. Bottom shell; 72. Antenna cover. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1-4As shown, an integrated vehicle-mounted BeiDou-3 positioning system includes an antenna and radio frequency front-end assembly 1. The antenna and radio frequency front-end assembly 1 is connected to a signal information processing and interface assembly 2. The antenna and radio frequency front-end assembly 1 and the signal information processing and interface assembly 2 are connected to a power module 3. The signal information processing and interface assembly 2 is connected to a comprehensive cable 4. The antenna and radio frequency front-end assembly 1 has a passive omnidirectional antenna and a radio frequency front-end. The radio frequency front-end is equipped with a cavity filter.

[0024] Specifically, the passive omnidirectional antenna includes an S-antenna 11, an L-antenna 12, a B1 antenna 13, and a B2 / B3 antenna 14. The S-antenna 11, B1 antenna 13, and B2 / B3 antenna 14 of the passive omnidirectional antenna primarily receive radio signals from BeiDou-2 and BeiDou-3 satellites at the B1 frequency points (including B1C, B1I, B1Q), B3 frequency points (including B3I, B3Q, B3A, B3AE), B2b frequency points, and S frequency points (including S1I, S1Q, S2C_d, S2C_p, S2A). Under vehicle-mounted conditions, this ensures the gain of the vehicle-mounted BeiDou-3 positioning system at low elevation angles. The L-antenna 12 is designed as a microstrip antenna with a frustum-shaped reflector, transmitting radio frequency signals from BeiDou-2 and BeiDou-3 satellites at the L frequency points (including Lf0, Lf1, Lf2, Lf3, Lf4, Lf5).

[0025] In detail, the S-antenna 11 is placed at the center of the passive omnidirectional antenna, while the B1 antenna 13 and L antenna 12 adopt a microstrip antenna design, and the B2 / B3 antenna 14 also adopts a microstrip antenna design. Based on the actual dimensions, a suitable substrate is selected. Finally, after combining the antenna radiating elements and structural elements, theoretical analysis and simulation calculations are performed on various indicators to derive a specific antenna design scheme.

[0026] Furthermore, the front-end component includes a low-noise amplifier circuit 15 connected to the S-antenna 11, B1 antenna 13, and B2 / B3 antenna 14. The low-noise amplifier circuit 15 is connected to a receiver combiner 16. The L-antenna 12 is connected to a power amplifier circuit 17 and a filter amplifier circuit 18. The power amplifier circuit 17 and the filter amplifier circuit 18 are connected to a power amplifier control switch 19. The front-end component performs low-noise amplification of the S-frequency, B3-frequency, B2b-frequency, and B1-frequency bands and power amplification of the L-frequency band. It also performs receiver combining of the signals through the receiver combiner 16. This design greatly reduces the types and number of interfaces between components, making the connection relationship of the entire system simpler and the operation more reliable.

[0027] Furthermore, a B1 cavity filter 5 is connected between the B1 antenna 13 and the low-noise amplifier circuit 15. The B1 cavity filter 5 performs cavity filtering of the received signal at the B1 frequency, improving out-of-band spurious suppression capability and achieving excellent isolation and shielding effects, reducing the design difficulty for system compatibility. Similarly, an L cavity filter 6 is connected between the L antenna 12 and the power amplifier circuit 17. The L cavity filter 6 performs cavity filtering of the transmitted signal, improving out-of-band spurious suppression capability and achieving excellent isolation and shielding effects, reducing the design difficulty for shielding strong signals during the transmission of the entire device. The B1 cavity filter 5 and the L cavity filter 6 primarily implement the filtering function for L-band incoming signals transmitted by BeiDou-3 compatible with BeiDou-2, and the amplification and filtering function for L-band incoming signals transmitted globally in short message service. The filtering capability design effectively ensures the functional performance of electromagnetic compatibility RE102, RE103, and equipment transceiver isolation.

[0028] In addition, the signal information processing and interface component 2 encompasses functions such as RNSS signal reception, RDSS signal reception and transmission, global short message signal reception and transmission, RNSS navigation, positioning, and timing, RDSS service functions, and global short message service. It provides ephemeris data and time synchronization signals from visible satellites and achieves anti-spoofing interference capabilities. Signal information processing and external data interface interaction effectively ensure the achievement of the data update rate target. Specifically, it includes a navigation RF circuit 21, a navigation baseband circuit 22, and an interface processing circuit 23. The navigation RF circuit 21 receives RF signals from the receiving combiner 16 via a navigation power divider circuit 24, and transmits RF signals from the filtering amplifier circuit 18 via a transmitting filter amplifier circuit 25. The navigation baseband circuit 22 is connected to the timing processing circuit 26.

[0029] The navigation radio frequency circuit 21 implements the following RNSS signal reception functions: reception of BeiDou-2 and BeiDou-3 navigation satellite RNSS signals, reception of SBAS enhanced service signals broadcast by BeiDou-3 satellites, direct acquisition and guided acquisition of precise ranging codes for B1A, B3Q, B3A, and B3AE authorized signals, and RNSS signal reception functions such as punch code-assisted military code acquisition for B3A and B3AE signals. It also implements the following RDSS signal reception and transmission functions: direct acquisition and guided acquisition of RDSS S-band downlink signals, reception of BeiDou-2 and BeiDou-3 S-band outbound signals, and transmission of BeiDou-2 and BeiDou-3 L-band inbound signals. Finally, it implements the following global short message signal reception and transmission functions: reception of global short message downlink signal B2b and global short message L-band inbound transmission signals.

[0030] The timing processing circuit 26 implements multiple positioning modes such as single-frequency, dual-frequency, and SBAS. It receives differential information for pseudorange differential (RTD) positioning, generates a local 1PPS pulse signal and time synchronization signal, and performs RNSS navigation and positioning timing processing functions such as receiver autonomous integrity monitoring (RAIM). It also provides pseudorange, pseudorange rate, and ephemeris information to the inertial navigation system (INS) and receives gyroscope, accelerometer, PVT, and attitude information to achieve inertial / satellite integrated navigation. It provides ephemeris data and time synchronization signals from visible satellites. It effectively achieves RNSS and RDSS reception with anti-narrowband interference capabilities and performance indicators.

[0031] Meanwhile, power module 3 covers the equipment's steady-state operating voltage range of 20V to 32V, and its input protection features include surge protection, spike protection, and startup disturbance protection. Power module 3 also features automatic protection against overcurrent, overvoltage, undervoltage, or accidental reverse polarity. After the equipment is disconnected from the power supply, it also has internal data loss protection. Specifically, it includes a 5V power circuit 31 connected to the signal processing and interface component 2, a 28V power circuit 32 connected to the power amplifier control switch 19, and the 28V power circuit 32 connected to the integrated cable 4 via an input filter circuit 33. Both the 5V power circuit 31 and the 28V power circuit 32 are connected to an input protection circuit 34.

[0032] As can be seen, power module 3 has a DC-DC switching regulator chip N2, which is equipped with linear regulators N1, N3-N6. Power module 3 implements input protection functions such as EMI suppression filtering and input overvoltage / undervoltage protection. The 5V power supply circuit 31 completes the DC-DC conversion from external input power to internal 5V output, and provides overcurrent, overvoltage, and short-circuit protection for the output 5V. The 28V power supply circuit 32 completes the DC-DC conversion from external input power to internal 20V / 28V output, provides overcurrent, overvoltage, and short-circuit protection for the output 20V / 28V, and controls the switching between 20V / 28V output via input PA control signals. The input filter circuit 33 filters the externally exchanged data signals.

[0033] It is obvious that the positioning system is installed inside the main unit 7. The main unit 7 is cylindrical in shape with a disc-shaped mounting surface at the bottom. The main unit 7 is enclosed by a bottom shell 71 and a large-curvature arc-shaped antenna cover 72. The passive omnidirectional antenna is fastened to the upper part of the bottom shell 71 by stainless steel combination screws. The bottom shell 71 is equipped with a waterproof and breathable valve.

[0034] Preferably, the integrated cable 4 is connected to the interface socket, which has clear markings and anti-misinsertion devices. All external interfaces use non-standard connectors to prevent misinsertion.

[0035] In summary, the principle of this embodiment is as follows: a passive omnidirectional antenna is used, integrating three different antenna arrays—S antenna 11, L antenna 12, B1 antenna 13, and B2 / B3 antenna 14—on a single substrate. Based on the actual dimensions, a high-reflectivity composite substrate is selected. Finally, after combining the antenna radiator unit and structural unit, simulation analysis of various indicators is performed, and integrated RF front-end signal isolation is optimized, improving the system's RF anti-interference capability and thus significantly enhancing the system's positioning accuracy and reliability.

[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0037] Although this document frequently uses terms such as antenna and RF front-end assembly 1, S-antenna 11, L-antenna 12, B1 antenna 13, B2 / B3 antenna 14, low-noise amplifier circuit 15, receiver combiner 16, power amplifier circuit 17, filter amplifier circuit 18, power amplifier control switch 19, signal information processing and interface assembly 2, navigation RF circuit 21, navigation baseband circuit 22, interface processing circuit 23, navigation power divider circuit 24, transmit filter amplifier circuit 25, timing processing circuit 26, power module 3, 5V power supply circuit 31, 28V power supply circuit 32, input filter circuit 33, input protection circuit 34, integrated cable 4, B1 cavity filter 5, L-cavity filter 6, main unit 7, bottom shell 71, and antenna radome 72, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. An integrated vehicle-mounted BeiDou-3 positioning system, comprising an antenna and a radio frequency front-end assembly (1), wherein the antenna and radio frequency front-end assembly (1) is connected to a signal information processing and interface assembly (2), the antenna and radio frequency front-end assembly (1) and the signal information processing and interface assembly (2) are connected to a power module (3), and the signal information processing and interface assembly (2) is connected to a composite cable (4), characterized in that, The antenna and radio frequency front-end assembly (1) has a passive omnidirectional antenna and a radio frequency front-end, the radio frequency front-end being equipped with a cavity filter.

2. The integrated vehicle-mounted BeiDou-3 positioning system according to claim 1, characterized in that, The passive omnidirectional antenna includes an S antenna (11), an L antenna (12), a B1 antenna (13), and a B2 / B3 antenna (14).

3. The integrated vehicle-mounted BeiDou-3 positioning system according to claim 2, characterized in that, The S antenna (11) is placed at the center of the passive omnidirectional antenna, the B1 antenna (13) and L antenna (12) are designed as microstrip antennas, and the B2 / B3 antenna (14) are designed as microstrip antennas.

4. The integrated vehicle-mounted BeiDou-3 positioning system according to claim 2, characterized in that, The front-end component includes a low-noise amplifier circuit (15) connected to the S antenna (11), B1 antenna (13) and B2 / B3 antenna (14), the low-noise amplifier circuit (15) being connected to a receiver combiner (16), the L antenna (12) being connected to a power amplifier circuit (17) and a filter amplifier circuit (18), and the power amplifier circuit (17) and the filter amplifier circuit (18) being connected to a power amplifier control switch (19).

5. The integrated vehicle-mounted BeiDou-3 positioning system according to claim 4, characterized in that, A B1 cavity filter (5) is connected between the B1 antenna (13) and the low-noise amplifier circuit (15), and an L cavity filter (6) is connected between the L antenna (12) and the power amplifier circuit (17).

6. The integrated vehicle-mounted BeiDou-3 positioning system according to claim 4, characterized in that, The signal information processing and interface component (2) includes a navigation radio frequency circuit (21), a navigation baseband circuit (22), and an interface processing circuit (23). The navigation radio frequency circuit (21) receives RF signals from the receiving combiner (16) through a navigation power divider circuit (24). The navigation radio frequency circuit (21) transmits RF signals to the filter amplifier circuit (18) through a transmit filter amplifier circuit (25). The navigation baseband circuit (22) is connected to a timing processing circuit (26).

7. The integrated vehicle-mounted BeiDou-3 positioning system according to claim 6, characterized in that, The power module (3) includes a 5V power circuit (31) connected to the signal information processing and interface component (2), the power amplifier control switch (19) is connected to a 28V power circuit (32), the 28V power circuit (32) is connected to the integrated cable (4) through the input filter circuit (33), and the 5V power circuit (31) and the 28V power circuit (32) are connected to an input protection circuit (34).

8. The integrated vehicle-mounted BeiDou-3 positioning system according to claim 7, characterized in that, The power module (3) has a DC-DC switching regulator chip N2, and the DC-DC switching regulator chip N2 is equipped with linear regulators N1, N3-N6.

9. The integrated vehicle-mounted BeiDou-3 positioning system according to claim 1, characterized in that, The positioning system is installed inside the host (7), which is enclosed by a bottom shell (71) and an antenna cover (72). The passive omnidirectional antenna is fastened to the upper end of the bottom shell (71) by stainless steel combination screws. The bottom shell (71) is equipped with a waterproof and breathable valve.

10. An integrated vehicle-mounted BeiDou-3 positioning system according to claim 1, characterized in that, The integrated cable (4) is connected to the interface socket.

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