Vehicle-mounted GPS dual-mode system module circuit

Abstract

The utility model discloses a vehicle-mounted GPS (global positioning system) dual-mode system module circuit, which comprises a modularized detachable GPS dual-mode circuit unit, and the GPS dual-mode circuit unit comprises a GPS dual-mode IC (integrated circuit), 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, a power connector of the power supply circuit is connected with a power output interface of the vehicle-mounted main control system, and power is supplied to the GPS dual-mode IC through the 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 the output end of the GPS dual-mode signal input circuit is connected with the GPS signal input end of the GPS dual-mode IC. According to the utility model, the GPS dual-mode system module circuit layout in a small space can be realized, and the system space utilization rate is high.

Description

Technical Field

[0001] This utility model relates to vehicle navigation technology, and more particularly to a vehicle GPS dual-mode system module circuit. Background Technology

[0002] The vehicle-mounted GPS dual-mode system module circuit refers to a hardware circuit module integrated into the vehicle terminal that can simultaneously receive and process signals from two different frequency bands or different satellite systems (such as GPS L1 and Beidou B1, or GPS L1 and GPS L5).

[0003] With the continuous advancement of technology, we have entered an era where car owners can enjoy clear and intelligent navigation information. In-car navigation systems are evolving towards faster, more accurate, real-time traffic updates, and smaller modules. Traditional single-mode GPS in-car navigation systems suffer from poor signal strength and are easily blocked by buildings or obstacles. This is due to the inherent disadvantages of single-mode receivers in signal reception, resulting in relatively low accuracy and stability, and an inability to provide fast and precise positioning, thus failing to meet user needs. Therefore, traditional single-mode GPS navigation systems have gradually been phased out of the market. They have been replaced by dual-mode GPS systems, which allow cars to simultaneously use GPS and other positioning methods. By fusing multiple signal sources, they improve positioning accuracy to within 1 meter. The dual-mode receiver, by simultaneously receiving signals of two different frequencies, effectively eliminates or reduces interference from the atmosphere and other factors, providing higher positioning accuracy and more stable performance in complex environments such as cities, mountains, and forests where signal interference is severe. This has earned widespread praise from car owners.

[0004] Utility model patent CN201520719215.9 discloses a vehicle-mounted terminal based on a dual-mode satellite navigation system. The satellite signal receiver is connected to a satellite signal processing module, and the central processing unit is connected to 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 includes one or a combination of BeiDou and GPS satellite signal receivers. The input / output module is connected to a display, indicator lights, a keyboard, and a touchscreen. The voice control module is connected to a speaker and a microphone. This utility model provides a vehicle-mounted terminal with dual-mode BeiDou and GPS satellite positioning capabilities. The positioning function utilizes a GIS system to improve positioning accuracy and connects to the vehicle network system via an external interface module, integrating data acquisition, data processing, data transmission, CAN technology, and driving record functions.

[0005] This utility model adopts an integrated solution, which has the following drawbacks;

[0006] 1) Low space utilization: The discrete circuits of the dual receivers need to be fixed on the main control board, occupying ≥30% of the board area. Users cannot disassemble unused functional modules, resulting in waste of resources.

[0007] 2) Poor upgrade flexibility: The terminal needs to interact with the vehicle network through complex external interfaces (CAN / USB / RS232), and the positioning module cannot be quickly replaced to adapt to the needs of different vehicle models;

[0008] 3) Insufficient power consumption optimization: The power management module provides unified power to the whole machine and cannot independently shut down the positioning subsystem. The sleep power consumption is ≥100mA8.

[0009] 4) Positioning data needs to be forwarded through multiple layers, including digital baseband processor → central processing unit → external interface (CAN / USB), resulting in a transmission delay of ≥100ms, which cannot meet the requirements of real-time navigation. Summary of the Invention

[0010] The technical problem to be solved by this utility model is to provide a vehicle-mounted GPS dual-mode system module circuit with high system space utilization.

[0011] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is a vehicle-mounted GPS dual-mode system module circuit, including a modular and detachable GPS dual-mode circuit unit. The GPS dual-mode circuit unit is connected to the vehicle main control system through a plurality of connection interfaces. The GPS dual-mode circuit unit includes 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 to receive and process dual-band GPS signals. The data control signal connector connects the GPS dual-mode IC and the vehicle main control system. The GPS dual-mode IC receives control signals from the vehicle main control system through the data control signal connector and realizes data interaction with the vehicle main control system. The power supply circuit includes a power connector and two LDOs. The power connector is connected to the power output interface of the vehicle main control system, and the two LDOs supply power to the GPS dual-mode IC. The GPS dual-mode signal input circuit includes a GPS antenna input interface. The GPS antenna input interface of the GPS dual-mode signal input circuit is connected to the GPS antenna output interface of the vehicle main control system or an external GPS antenna in the vehicle. The output terminal of the GPS dual-mode signal input circuit is connected to the GPS signal input terminal of the GPS dual-mode IC.

[0012] The vehicle-mounted GPS dual-mode system module circuit described above uses a data control signal connector to connect the UART serial port signal and GPIO control signal of the vehicle main control system's data control signal processor to the TRX signal and data control terminal of the GPS dual-mode IC. The positioning data output pin of the TRX signal and data control terminal of the GPS dual-mode IC outputs NMEA 0183 protocol positioning data to the main control system processor through the data control signal connector. The data feedback pin of the TRX signal and data control terminal of the GPS dual-mode IC is connected to the data control signal connector to provide real-time feedback on the working status of the GPS dual-mode IC to the data control signal processor of the vehicle main control system.

[0013] The above-described vehicle-mounted GPS dual-mode system module circuit uses two LDOs, a 1.8V LDO and a 3.3V LDO, respectively. The power connector is a 5V power connector, and the PMIC power supply of the vehicle main control system supplies power to the 5V power connector. The 5V power connector is connected to the input terminals of the 1.8V LDO and the 3.3V LDO, respectively. The output terminals of the 1.8V LDO and the 3.3V LDO are connected to the power input terminals of the GPS IC, respectively.

[0014] The vehicle-mounted GPS dual-mode system module circuit described above includes a GPS IC for receiving and processing L1 and L5 dual-band GPS signals. The GPS dual-mode signal input circuit includes a GPS dual-frequency filter and two GPS signal processing circuits. Each GPS signal processing circuit includes a single-frequency LNA low-noise amplifier IC and a single-frequency filter connected in series. The GPS dual-mode signal input circuit includes two GPS antenna input interfaces: the first GPS antenna input interface is connected to the GPS antenna output interface of the vehicle's main control system, and the second GPS antenna input interface is connected to the external vehicle GPS antenna. The input terminals of the GPS dual-frequency filter are respectively connected to the output terminals of the two GPS antenna input interfaces. The L1 band GPS signal output terminal and the L5 band GPS signal output terminal of the GPS dual-frequency filter are each connected to a corresponding GPS signal processing circuit. The output terminals of the two GPS signal processing circuits are respectively connected to the corresponding ports of the GPS dual-mode signal input terminal of the GPS IC.

[0015] The vehicle-mounted GPS dual-mode system module circuit described above includes a GPS dual-frequency filter that isolates L1 / L5 signals through frequency division multiplexing, suppresses out-of-band noise, and merges the dual-frequency signals to the same antenna port. The input terminal of the GPS dual-frequency filter is connected to either the first GPS antenna input interface or the second GPS antenna input interface via a jumper resistor.

[0016] The vehicle-mounted GPS dual-mode system module circuit described above has a first GPS antenna input interface as an antenna pad interface and a second GPS antenna input interface as an antenna coaxial interface. The antenna coaxial interface uses a 50-ohm RF antenna post connector.

[0017] The above-described vehicle-mounted GPS dual-mode system module circuit has its GPS dual-mode IC's reset pin connected to the reset signal output terminal of the vehicle's main control system's data control signal processor via a data control signal connector.

[0018] In the above-described vehicle GPS dual-mode system module circuit, the enable signal output pin of the data control signal connector is connected to the enable pins of two LDOs respectively, serving as the power supply control switch for the LDOs.

[0019] The vehicle-mounted GPS dual-mode system module circuit described above uses a CC0058Q chip for the GPS IC, a 10-pin connector for the data control signal connector, and a 4-pin connector for the power supply connector.

[0020] The vehicle-mounted GPS dual-mode system module circuit described above, and the vehicle-mounted main control system include all chip models from Unisoc, MediaTek, Qualcomm, or Allwinner brand platforms.

[0021] This utility model allows a single GPS IC to simultaneously receive dual-channel frequency GPS signals, enabling flexible use of GPS dual-mode functionality. It also allows for a smaller board size layout for the vehicle's main control system motherboard. The modular and detachable GPS dual-mode circuit unit, connected to the vehicle's main control system via a connection interface, allows for a smaller GPS dual-mode system module circuit layout, resulting in high system space utilization. Attached Figure Description

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

[0023] Figure 1 This is a structural block diagram of the vehicle-mounted GPS dual-mode system module circuit according to an embodiment of this utility model.

[0024] Figure 2 This is the power supply circuit diagram of the LDO_1V8 embodiment of this utility model.

[0025] Figure 3 This is the power supply circuit diagram of DO_3V3 in this embodiment of the utility model.

[0026] Figure 4 This is a circuit diagram of a 5V power supply 4-pin connector according to an embodiment of this utility model.

[0027] Figure 5This is a 12-pin data control signal connector according to Embodiment 1 of this utility model.

[0028] Figure 6 This is a schematic block diagram of the GPS dual-mode circuit unit according to an embodiment of this utility model. Detailed Implementation

[0029] The structure and principle of the vehicle-mounted GPS dual-mode system module circuit of this utility model embodiment are as follows: Figures 1 to 6 As shown, it includes a modular and detachable GPS dual-mode circuit unit (vehicle GPS dual-mode module circuit), which is connected to the vehicle main control system through multiple connection interfaces.

[0030] The GPS dual-mode circuit unit includes a GPS dual-mode IC, a power supply circuit, a data control signal connector, and a GPS dual-mode signal input circuit.

[0031] The GPS dual-mode system module circuit uses the CC0058Q chip for its GPS dual-mode IC. The UART0 pins 18pin RX and 19pin TX of the GPS dual-mode IC are connected to the data control terminal, and the data control signal connector is then connected to the main control system's data control signal processor.

[0032] like Figure 1 As shown, the TRX signal and data control terminal transmits NMEA 0183 protocol data control via UART (TX, RX) serial port. The data control signal connector connects the UART serial port signal and GPIO control signal of the vehicle main control system data control signal processor to the TRX signal and data control terminal of the GPS dual-mode IC. The positioning data output pin of the TRX signal and data control terminal of the GPS dual-mode IC outputs NMEA 0183 protocol positioning data to the main control system processor through the data control signal connector. The data feedback pin of the TRX signal and data control terminal of the GPS dual-mode IC is connected to the data control signal connector to provide real-time feedback on the working status of the GPS dual-mode IC to the data control signal processor of the vehicle main control system.

[0033] The NMEA 0183 protocol positioning data includes latitude, longitude, altitude, speed, and UTC time information, with a transmission baud rate of 9600bps.

[0034] The interaction process between the GPS dual-mode IC and the vehicle's main control system is as follows:

[0035] 1) Control Interface: The data control signal connector connects the UART serial port signals (TX / RX) and GPIO control signals (EN, RET) of the main control system to the data control terminal of the GPS dual-mode IC;

[0036] 2) Data output path: The UART_TX pin of the GPS dual-mode IC outputs NMEA0183 protocol positioning data to the main control system processor through the data control signal connector;

[0037] 3) Status feedback signal: The GPIO_STA pin of the GPS dual-mode IC is connected to the data control signal connector to provide real-time feedback on the module's working status (lock / search / fault).

[0038] like Figure 1 , Figure 5 and Figure 6 As shown, the GPIO_RET pin (Pin20) of the GPS dual-mode IC is connected to the GPIO output of the data control signal processor (main control MCU) of the vehicle main control system via the data control signal connector Pin4. When the main control MCU needs to reset the GPS IC, it outputs a low-level pulse (duration ≥10μs) to GPIO_RET. After the GPS IC detects this signal, its internal power management unit will generate a Core domain reset signal to perform a hardware reset of the chip core. After the reset is completed, the main control MCU needs to release GPIO_RET (return to high level).

[0039] The GPIO_1V8_EN pin (Pin3) on the data control signal connector is connected to the EN pins of LDO_1.8V and LDO_3.3V respectively, serving as a power supply control switch for the LDO. Its function is to output a low level to shut off the LDO power supply when the vehicle system is in sleep mode, thus entering power saving mode.

[0040] The CC0058Q GPS dual-mode IC chip is a dual-mode positioning IC that improves positioning reliability and accuracy by integrating signals from two GPS receiving frequencies: L1 (1575.42MHz band) and L5 (1176.45MHz band). A GPS frequency division multiplexing filter enables full-duplex communication through frequency isolation. The output pins of L1 and L5 are connected to the IN pins of a single-frequency LNA (Low Noise Amplifier) ​​IC, amplifying the GPS signal. The OUT pins of the L1 and L5 single-frequency LNAs are then connected to the IN pins of the L1 and L5 single-frequency filters, respectively. After out-of-band noise is suppressed by the single-frequency filters, the OUT pins of the L1 and L5 single-frequency filters are connected to the corresponding GPS dual-mode signal input pins of the GPS dual-mode IC. The ANT pin of the GPS dual-frequency filter is connected to either the GPS-ANT2 antenna coaxial interface or the GPS-ANT1 antenna soldering interface via a selector resistor, allowing for flexible antenna placement. The GPS-ANT1 antenna soldering interface serves as a backup interface for connecting to the GPS antenna coaxial interface on the main control system. The GPS-ANT2 coaxial interface connects to the vehicle-mounted external GPS antenna via a 50Ω RF cable, specifically for receiving L1 / L5 dual-frequency satellite signals. This interface, along with the GPS-ANT1 solder pad interface, is connected to the ANT terminal of the dual-frequency filter via a jumper resistor, with GPS-ANT2 being used by default to ensure signal quality.

[0041] like Figure 2 , Figure 3 and Figure 6 As shown, the GPS dual-mode IC CC0058Q chip is powered by two LDO voltages: VD_1.8 V600mA and VIO_3.3 V600mA. Each LDO's EN pin is connected in series with a resistor (R26, R27). One end of the resistor is connected to the control signal connector, and the other end is connected to the LDO's EN pin. The EN pins of both LDOs are connected to a common IO data signal, controlling the LDOs to a controllable state while ensuring that the output voltages of the two LDOs maintain consistent timing. This achieves optimal power consumption during system sleep mode. Figures 1 to 3 As shown, the VIN terminals of the two LDOs are connected to a 5V 4-pin power connector, which is then connected to the MPIC power control system of the main controller for 5V power supply.

[0042] The vehicle-mounted GPS dual-mode system module circuit of this utility model embodiment is applicable to all chip models of vehicle-mounted main control systems, including Unisoc, MediaTek, Qualcomm, or Allwinner, but is not limited to the above platforms and all chip models of main control systems.

[0043] The GPS dual-mode IC uses the CC0058Q chip, the data control signal connector is a 10-pin connector, and the power connector is a 4-pin connector.

[0044] The power supply circuit uses an LDO_1.8V LDO that meets or exceeds 1.8V / 600mA, and an LDO_3.3V LDO that meets or exceeds 3.3V / 600mA.

[0045] The GPS coaxial antenna ANT2 uses a 50-ohm RF antenna post connector, which can shield the GPS signal from external signal interference when connected with an RF cable.

[0046] The GPS dual-frequency filter achieves full-duplex communication through frequency division multiplexing and frequency isolation. It suppresses out-of-band noise of the received GPS dual-frequency signals L1 (1575.42MHz band) and L5 (1176.45MHz band) and combines the received signals to the same antenna port.

[0047] The power supply circuit is connected to the GPS dual-mode module circuit 5V power connector by the main control PMIC power control system. The 5V power connector is connected to the VIN terminal of LDO_1.8V and the VIN terminal of LDO_3.3V respectively. The VOUT terminal of LDO_1.8V and the VOUT terminal of LDO_3.3V are respectively connected to the power input terminal of GPS dual-mode IC. The GPS dual-mode signal input circuit connects the ANT pin of the GPS dual-frequency filter to the coaxial interface of the GPS-ANT2 antenna and the soldering interface of the GPS-ANT1 antenna, respectively. The GPS-ANT1 antenna soldering interface is then connected to the coaxial interface of the GPS antenna on the main control system side. The L1 and L5 pins of the GPS dual-frequency filter are each connected to the IN pin of the single-frequency LNA low-noise amplifier IC. The OUT pins of the L1 and L5 single-frequency LNA low-noise amplifier IC are connected to the IN pins of the L1 and L5 single-frequency filters, respectively. The OUT pins of the L1 and L5 single-frequency filters are then connected to the GPS dual-mode signal input circuit of the GPS dual-mode IC. The main control data signal processor is connected to the data control signal connector, which in turn connects to the TRX signal of the GPS dual-mode IC and the data control circuit.

[0048] The above embodiments of this utility model have the following beneficial effects:

[0049] 1) Modular design: The main control board of the vehicle system does not need to reserve space for GPS circuits, reducing the cost and layout complexity of the main control board of the vehicle system;

[0050] 2) Easy and flexible upgrades: Dual-mode modules can be quickly installed / removed via connectors;

[0051] 3) Dual-frequency advantages: L1 / L5 signal fusion improves positioning accuracy and anti-interference capability;

[0052] 4) Low power consumption: The positioning subsystem can be shut down independently;

[0053] 5) The positioning data of the GPS dual-mode IC is directly connected to the main control processor via UART_TX, eliminating the intermediate forwarding link, resulting in low signal delay and meeting the needs of real-time navigation.

Claims

1. A vehicle-mounted GPS dual-mode system module circuit, characterized in that, It includes a modular and detachable GPS dual-mode circuit unit, which is connected to the vehicle main control system through multiple connection interfaces; the GPS dual-mode circuit unit includes 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 to receive and process dual-band GPS signals. The data control signal connector connects the GPS dual-mode IC and the vehicle main control system. The GPS dual-mode IC receives control signals from the vehicle main control system through the data control signal connector and realizes data interaction with the vehicle main control system. The power supply circuit includes a power connector and two LDOs. The power connector is connected to the power output interface of the vehicle main control system and supplies power to the GPS dual-mode IC through the two LDOs. The GPS dual-mode signal input circuit includes a GPS antenna input interface. The GPS antenna input interface of the GPS dual-mode signal input circuit is connected to the GPS antenna output interface of the vehicle main control system or an external GPS antenna in the vehicle. The output terminal of the GPS dual-mode signal input circuit is connected to the GPS signal input terminal of the GPS dual-mode IC.

2. The vehicle-mounted GPS dual-mode system module circuit according to claim 1, characterized in that, The data control signal connector connects the UART serial port signal and GPIO control signal of the vehicle main control system's data control signal processor to the TRX signal and data control terminal of the GPS dual-mode IC. The positioning data output pin of the TRX signal and data control terminal of the GPS dual-mode IC outputs NMEA 0183 protocol positioning data to the main control system processor through the data control signal connector. The data feedback pin of the TRX signal and data control terminal of the GPS dual-mode IC is connected to the data control signal connector to provide real-time feedback on the working status of the GPS dual-mode IC to the data control signal processor of the vehicle main control system.

3. The vehicle-mounted GPS dual-mode system module circuit according to claim 1, characterized in that, The two LDOs are a 1.8V LDO and a 3.3V LDO, respectively. The power connector is a 5V power connector, and the PMIC power supply of the vehicle main control system supplies power to the 5V power connector. The 5V power connector is connected to the input terminals of the 1.8V LDO and the 3.3V LDO, respectively. The output terminals of the 1.8V LDO and the 3.3V LDO are connected to the power input terminals of the GPS IC, respectively.

4. The vehicle-mounted GPS dual-mode system module circuit according to claim 1, characterized in that, The GPS IC is used to receive and process L1 and L5 dual-band GPS signals. The GPS dual-mode signal input circuit includes a GPS dual-band filter and two GPS signal processing circuits. The GPS signal processing circuit includes a single-frequency LNA low-noise amplifier IC and a single-frequency filter connected in series. The GPS dual-mode signal input circuit includes two GPS antenna input interfaces. The first GPS antenna input interface is connected to the GPS antenna output interface of the vehicle main control system, and the second GPS antenna input interface is connected to the vehicle external GPS antenna. The input terminal of the GPS dual-band filter is connected to the output terminals of the two GPS antenna input interfaces respectively. The L1 band GPS signal output terminal and the L5 band GPS signal output terminal of the GPS dual-band filter are each connected to a corresponding GPS signal processing circuit. The output terminals of the two GPS signal processing circuits are respectively connected to the corresponding ports of the GPS dual-mode signal input terminal of the GPS IC.

5. The vehicle-mounted GPS dual-mode system module circuit according to claim 4, characterized in that, The GPS dual-frequency filter isolates L1 / L5 signals through frequency division multiplexing, suppresses out-of-band noise, and combines the dual-frequency signals to the same antenna port; the input of the GPS dual-frequency filter is connected to the first GPS antenna input interface or the second GPS antenna input interface through a jumper resistor.

6. The vehicle-mounted GPS dual-mode system module circuit according to claim 4, characterized in that, The first GPS antenna input interface is an antenna pad interface, and the second GPS antenna input interface is an antenna coaxial interface. The antenna coaxial interface uses a 50-ohm RF antenna post connector.

7. The vehicle-mounted GPS dual-mode system module circuit according to claim 1, characterized in that, 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 main control system through a data control signal connector.

8. The vehicle-mounted GPS dual-mode system module circuit according to claim 1, characterized in that, The enable signal output pin of the data control signal connector is connected to the enable pins of the two LDOs respectively, serving as the power supply control switch for the LDOs.

9. The vehicle-mounted GPS dual-mode system module circuit according to claim 1, characterized in that, The GPS IC uses a CC0058Q chip, the data control signal connector uses a 10-pin connector, and the power connector uses a 4-pin connector.

10. The vehicle-mounted GPS dual-mode system module circuit according to claim 1, characterized in that, The aforementioned vehicle main control system includes vehicle main control systems based on all chip models from Unisoc, MediaTek, Qualcomm, or Allwinner brand platforms.

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