CN-224225021-U - Vehicle-mounted GPS dual-mode system module circuit

Abstract

The utility model discloses a vehicle-mounted GPS dual-mode system module circuit which comprises a modularized detachable GPS dual-mode circuit unit, wherein the GPS dual-mode circuit unit comprises a GPS dual-mode IC, a power supply circuit, a data control signal connector and a GPS dual-mode signal input circuit, the GPS dual-mode IC is used for receiving and processing dual-band GPS signals, the data control signal connector is connected with the GPS dual-mode IC and a vehicle-mounted main control system, a power supply connector of the power supply circuit is connected with a power supply output interface of the vehicle-mounted main control system and supplies power to the GPS dual-mode IC through two LDOs, the GPS dual-mode signal input circuit comprises a GPS antenna input interface, the GPS antenna input interface is connected with a GPS antenna output interface of the vehicle-mounted main control system or a vehicle-mounted external GPS antenna, and an output end of the GPS dual-mode signal input circuit is connected with a GPS signal input end of the GPS dual-mode IC. The utility model can realize the circuit layout of the GPS dual-mode system module with smaller space and has high system space utilization rate.

Inventors

• CHEN HUAIXIANG
• HAO YONGJIAN

Assignees

• 深圳市鼎微科技有限公司

Dates

Publication Date

20260512

Application Date

20250611

Claims (10)

1. 1. The vehicle-mounted GPS dual-mode system module circuit is characterized by comprising a modularized detachable GPS dual-mode circuit unit, wherein the GPS dual-mode circuit unit is connected with a vehicle-mounted main control system through a plurality of connection interfaces, the GPS dual-mode circuit unit comprises a GPS dual-mode IC, a power supply circuit, a data control signal connector and a GPS dual-mode signal input circuit, the GPS dual-mode IC is used for receiving and processing dual-band GPS signals, the data control signal connector is connected with the GPS dual-mode IC and the vehicle-mounted main control system, the GPS dual-mode IC receives control signals of the vehicle-mounted main control system through the data control signal connector and realizes data interaction with the vehicle-mounted main control system, the power supply circuit comprises a power supply connector, two LDOs and a power supply connector which are connected with a power supply output interface of the vehicle-mounted main control system, the GPS dual-mode circuit supplies power to the GPS dual-mode IC through the two LDOs, the GPS dual-mode signal input circuit comprises a GPS antenna input interface, and the GPS antenna input interface of the GPS dual-mode signal input circuit is connected with a GPS antenna output interface of the vehicle-mounted main control system or a GPS dual-mode external GPS antenna, and the output end of the GPS dual-mode signal input circuit is connected with a GPS signal input end of the GPS dual-mode IC.
2. 2. The vehicle-mounted GPS dual-mode system module circuit according to claim 1, wherein the data control signal connector connects a UART serial port signal and a GPIO control signal of the vehicle-mounted main control system data control signal processor to a TRX signal and a data control end of the GPS dual-mode IC, a positioning data output pin of the TRX signal and the data control end of the GPS dual-mode IC outputs NMEA 0183 protocol positioning data to the main control system processor through the data control signal connector, and a data feedback pin of the TRX signal and the data control end of the GPS dual-mode IC is connected with the data control signal connector to feed back the working state of the GPS dual-mode IC to the data control signal processor of the vehicle-mounted main control system in real time.
3. 3. The vehicle-mounted GPS dual-mode system module circuit according to claim 1, wherein the two LDOs are respectively 1.8V LDOs and 3.3V LDOs, the power connector is a 5V power connector, PMIC power of the vehicle-mounted main control system supplies power to the 5V power connector, the 5V power connector is respectively connected with an input end of the 1.8V LDOs and an input end of the 3.3V LDOs, and an output end of the 1.8V LDOs and an output end of the 3.3V LDOs are respectively connected with a GPS IC power input end.
4. 4. The vehicle-mounted GPS dual-mode system module circuit according to claim 1 is characterized in that the GPS IC is used for receiving and processing L1 and L5 dual-band GPS signals, the GPS dual-mode signal input circuit comprises a GPS dual-frequency filter and two GPS signal processing circuits, the GPS signal processing circuit comprises a single-frequency LNA low-noise amplifier IC and a single-frequency filter which are sequentially connected in series, the GPS dual-mode signal input circuit comprises two GPS antenna input interfaces, a first GPS antenna input interface is connected with a GPS antenna output interface of a vehicle-mounted main control system, a second GPS antenna input interface is connected with the vehicle-mounted external GPS antenna, the input ends of the GPS dual-frequency filter are respectively connected with the output ends of the two GPS antenna input interfaces, the L1 frequency band GPS signal output end and the L5 frequency band GPS signal output end of the GPS dual-frequency filter are respectively connected with a corresponding GPS signal processing circuit, and the output ends of the two GPS signal processing circuits are respectively connected to ports corresponding to the GPS dual-mode signal input ends of the GPS IC.
5. 5. The vehicle-mounted GPS dual-mode system module circuit according to claim 4, wherein the GPS dual-frequency filter isolates L1/L5 signals through frequency division multiplexing, suppresses out-of-band noise, and combines dual-frequency signals to the same antenna port, and wherein an input end of the GPS dual-frequency filter is connected with the first GPS antenna input interface or the second GPS antenna input interface through a skip resistor in a selectable manner.
6. 6. The vehicle-mounted GPS dual-mode system module circuit of claim 4, wherein the first GPS antenna input interface is an antenna pad interface, the second GPS antenna input interface is an antenna coaxial interface, and the antenna coaxial interface employs a 50 ohm rf antenna post connector.
7. 7. The vehicle-mounted GPS dual-mode system module circuit of claim 1, wherein the reset pin of the GPS dual-mode IC is connected to the reset signal output of the data control signal processor of the vehicle-mounted main control system through a data control signal connector.
8. 8. The vehicle-mounted GPS dual-mode system module circuit of claim 1, wherein the enable signal output pins of the data control signal connector are respectively connected with the enable pins of two LDOs as power supply control switches of the LDOs.
9. 9. The vehicle-mounted GPS dual-mode system module circuit of claim 1, wherein the GPS IC employs a CC0058Q chip, the data-control signal connector employs a 10pin connector, and the power connector employs a 4pin connector.
10. 10. The vehicle-mounted GPS dual-mode system module circuit of claim 1, wherein the vehicle-mounted main control system comprises a vehicle-mounted main control system of all chip types of a purple light exhibition, concurrency, high-pass or full-mark brand platform.

Description

Vehicle-mounted GPS dual-mode system module circuit Technical Field The utility model relates to a vehicle navigation technology, in particular to a vehicle GPS dual-mode system module circuit. Background The vehicle-mounted GPS dual-mode system module circuit is a hardware circuit module integrated in the vehicle-mounted terminal and capable of receiving and processing signals of two different frequency bands or different satellite systems (such as GPS L1 and Beidou B1 or GPS L1 and GPS L5) at the same time. Along with the continuous progress of technology, the automobile navigation system is now an age of clear and intelligent road conditions of automobile navigation by automobile owners, and the automobile navigation system is also developed towards the aims of quick positioning, accurate real-time road conditions and small modules. The traditional GPS single-mode vehicle navigation signal difference is easy to be subjected to building or obstacle shielding signals, is limited by the fact that a single-mode receiver has certain disadvantages in signal receiving, has relatively low precision and stability, cannot rapidly and accurately position, and cannot meet the demands of people. Therefore, the traditional vehicle navigation purely by GPS single-mode positioning gradually exits from the market, instead, the GPS dual-mode system has the advantages that GPS and other positioning modes can be used for automobiles at the same time, the positioning accuracy can be improved by fusing a plurality of signal sources to reach a distance within 1 meter, and the dual-mode receiver can effectively eliminate or reduce the interference of the atmosphere and other factors on the signals by simultaneously receiving signals with two different frequencies, so that higher positioning accuracy and more stable performance are provided in places with serious signal interference such as cities, mountain areas, forests and the like in complex environments, and the method is well appreciated by the owners of the automobiles. The utility model discloses a vehicle-mounted terminal based on a dual-mode satellite navigation system, which is characterized in that a satellite signal receiver is connected with a satellite signal processing module, a central processing unit is respectively connected with the satellite signal processing module, a GIS system, a communication module, a voice control module, an external interface module, an input/output module and a storage module, the satellite signal receiver comprises one or a combination of two of a Beidou satellite signal receiver and a GPS satellite signal receiver, the input/output module is respectively connected with a display, an indicator light, a keyboard and a touch screen, and the voice control module is respectively connected with a loudspeaker and a microphone. The utility model provides a vehicle-mounted terminal with Beidou and GPS dual-mode satellite positioning function, wherein a GIS system is adopted in the positioning function to improve positioning precision, and the vehicle-mounted terminal is connected with a vehicle-mounted network system through an external interface module, so that functions of data acquisition, data processing, data transmission, CAN technology, driving record and the like are integrated. The utility model adopts a whole integration scheme, and has the following defects; 1) The space utilization rate is low, the double-receiver discrete circuit needs to be fixedly distributed on the main control board, occupies more than or equal to 30% of the area of the board, and a user cannot detach unused functional modules, so that resource waste is caused; 2) The upgrade flexibility is poor, the terminal needs to interact with the vehicle network through a complex external interface (CAN/USB/RS 232), and the positioning module cannot be quickly replaced so as to adapt to the requirements of different vehicle types; 3) The power consumption optimization is insufficient, the power management module supplies power to the whole machine uniformly, the positioning subsystem cannot be closed independently, and the dormancy power consumption is more than or equal to 100mA8. 4) The positioning data is required to be forwarded through a digital baseband processor, a central processing unit and an external interface (CAN/USB) in multiple layers, so that the transmission delay is more than or equal to 100ms, and the real-time navigation requirement cannot be met. Disclosure of Invention The utility model aims to solve the technical problem of providing a vehicle-mounted GPS dual-mode system module circuit with high system space utilization rate. In order to solve the technical problems, the technical scheme adopted by the utility model is that the vehicle-mounted GPS dual-mode system module circuit comprises a modularized detachable GPS dual-mode circuit unit, wherein the GPS dual-mode circuit unit is connected with a vehicle-mounted main control system through a