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CN-121978720-A - Beidou independent positioning communication device

CN121978720ACN 121978720 ACN121978720 ACN 121978720ACN-121978720-A

Abstract

The invention relates to a Beidou independent positioning communication device which is characterized by comprising a main control chip, a communication expansion module and an interface module, wherein the interface module comprises a 485 interface, a TTL interface and an antenna interface, the main control chip U1 is connected with an external antenna E1 through an antenna interface J3, an output pin of the main control chip U1 is connected with TTL communication equipment through a TTL interface J2, the communication expansion module comprises an RS-485 transceiver chip U2, one side of the RS-485 transceiver chip U2 is connected with the main control chip U1 through an isolation chip U3, and the other side of the RS-485 transceiver chip U2 is connected with the 485 interface J1 and is used for bidirectional conversion of a TTL level UART signal output by the main control chip U1 and a differential RS485 signal. The Beidou independent positioning communication device provided by the invention can be directly in butt joint with external hardware equipment of different communication types, and a communication conversion module is not required to be additionally configured, so that the system integration cost is reduced, and the application range of the device is enlarged.

Inventors

  • GU GUANGYU

Assignees

  • 上海欣影电力科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260129

Claims (10)

  1. 1. The Beidou independent positioning communication device is characterized by comprising a main control chip U1, a communication expansion module and an interface module; The interface module comprises a 485 interface J1, a TTL interface J2 and an antenna interface J3; the main control chip U1 is connected with the external antenna E1 through an antenna interface J3, and an output pin of the main control chip U1 is connected with the TTL interface J2 and the external TTL communication equipment; the communication expansion module comprises an RS-485 receiving and transmitting chip U2, one side of the RS-485 receiving and transmitting chip U2 is connected with a main control chip U1 through an isolation chip U3, and the other side of the RS-485 receiving and transmitting chip U2 is connected with a 485 interface J1 and is used for performing bidirectional conversion on UART signals of TTL level output by the main control chip U1 and differential RS485 signals.
  2. 2. The Beidou independent positioning communication device according to claim 1, wherein the external antenna E1 is connected to an RF_IN pin of the main control chip U1 through a microstrip line, and a VCC_RF pin of the main control chip U1 is connected to the external antenna E1 through a grounding capacitor C1 and an inductor L1 IN sequence to provide a direct current bias path for the antenna.
  3. 3. The Beidou independent positioning communication device according to claim 1, wherein TXD and RXD pins of the main control chip U1 are universal serial communication ends, and are connected to the isolation chip U3 and the TTL interface J2 through the resistors R3 and R4 respectively for transmitting positioning data.
  4. 4. The Beidou independent positioning communication device according to claim 1, wherein TIMEIMPULSE pins of the main control chip U1 are connected with driving LEDs through resistors R1 and diodes D1 for indicating positioning states.
  5. 5. The Beidou independent positioning communication device according to claim 1, wherein VBCKP pins of the main control chip U1 are connected with a standby battery BAT and used for storing ephemeris data to realize hot start quick positioning.
  6. 6. The Beidou independent positioning communication device according to claim 1, wherein an output receiving interface RO is connected with a B1 interface of an isolation chip U3, a driving input interface DI is connected with a B2 interface of the isolation chip U3, and a receiving/driving enabling interface RE/DE is short-circuited and then connected with VCC at the input side of the RS-485 transceiver chip U2; The output side of the RS-485 transceiver chip U2 is connected with a bus terminal matching resistor in a bridging mode between a differential bus interface A and a differential bus interface B of the RS-485 transceiver chip U2, the differential bus interface A is connected to a power supply of the RS-485 transceiver chip U2 through a pull-up resistor, the differential bus interface B is connected to the ground through a pull-down resistor, and ESD protection diodes are respectively connected in parallel among the differential bus interface A, the differential bus interface B and the ground.
  7. 7. The Beidou independent positioning communication device according to claim 1, wherein the isolation chip U3 is used for realizing signal isolation between an RS-485 side and a main control chip; On the RS-485 side, signal interfaces B1 and B2 are respectively connected with an output and receiving interface RO and a driving input interface DI of an RS-485 transceiver; on the main control chip side, signal interfaces A1 and A2 are respectively connected with TXD and RXD pins of a main control chip U1, and VCCA is connected with a 3.3V power supply on the main control chip side.
  8. 8. The Beidou independent positioning communication device according to claim 1 is characterized in that the 485 interface J1 is provided with a 4 Pin terminal, wherein a pin 1 is an external power supply/output pin and provides 5V power for an RS-485 transceiver chip U2, a pin 2 is an A line of RS485 communication and is connected with a differential bus interface A of the RS-485 transceiver chip U2, a pin3 is a B line of RS485 communication and is connected with a differential bus interface B of the RS-485 transceiver chip U2, and a pin4 is a signal ground and is connected with a device ground and provides reference ground for communication and power supply.
  9. 9. The Beidou independent positioning communication device according to claim 1, wherein the TTL interface J2 is a TTL serial interface, a 4Pin terminal is adopted, a Pin 1 is a RXD end, a Pin 2 is a TXD end, a Pin 3 is a PPS end, a Pin 4 is a GND end, the TXD end is connected with a TXD Pin of the main control chip U1, the RXD end is connected with a RXD Pin of the main control chip U1, and connection of the main control chip U1 and external TTL communication equipment is realized.
  10. 10. The Beidou independent positioning communication device according to claim 1 is characterized in that the main control chip U1 and the antenna interface J3 are arranged on the same surface of a PCB, and the RS-485 transceiver chip U2, the isolation chip U3, the 485 interface J1 and the TTL interface J2 are arranged on the other surface of the PCB.

Description

Beidou independent positioning communication device Technical Field The invention relates to the technical field of satellite positioning, in particular to a Beidou independent positioning device. Background With rapid development of Beidou positioning navigation, many industries put forward strict requirements on equipment positioning, such as an on-line monitoring device of a power transmission line, most of the former adopts GPS positioning, and because the power transmission line belongs to important strategic facilities, the Beidou positioning is only required to be used in the current industry by force in consideration of information safety. The power transmission line on-line monitoring device can be quickly integrated into the pure Beidou independent positioning communication device. The development cost is reduced. Disclosure of Invention The invention aims to realize rapid integrated docking of a Beidou independent positioning communication device and existing hardware equipment in the future, and provides the Beidou independent positioning communication device. The aim of the invention can be achieved by the following technical scheme: The Beidou independent positioning communication device comprises a main control chip U1, a communication expansion module and an interface module; The interface module comprises a 485 interface J1, a TTL interface J2 and an antenna interface J3; the main control chip U1 is connected with the external antenna E1 through an antenna interface J3, and an output pin of the main control chip U1 is connected with the TTL interface J2 and the external TTL communication equipment; the communication expansion module comprises an RS-485 receiving and transmitting chip U2, one side of the RS-485 receiving and transmitting chip U2 is connected with a main control chip U1 through an isolation chip U3, and the other side of the RS-485 receiving and transmitting chip U2 is connected with a 485 interface J1 and is used for performing bidirectional conversion on UART signals of TTL level output by the main control chip U1 and differential RS485 signals. As a preferred technical scheme, the external antenna E1 is connected to the rf_in pin of the main control chip U1 through a microstrip line, and the vcc_rf pin of the main control chip U1 is connected to the external antenna E1 sequentially through the grounding capacitor C1 and the inductor L1, so as to provide a dc bias path for the antenna. As a preferred technical scheme, the TXD and RXD pins of the master control chip U1 are universal serial communication terminals, and are connected to the isolation chip U3 and the TTL interface J2 through the resistors R3 and R4, respectively, for transmitting positioning data. As a preferable technical scheme, the TIMEIMPULSE pin of the main control chip U1 is connected with the driving LED after passing through the resistor R1 and the diode D1, and is used for indicating the positioning state. As an optimal technical scheme, VBCKP pins of the main control chip U1 are connected with a standby battery BAT and used for storing ephemeris data so as to realize hot start quick positioning. As a preferable technical scheme, an output receiving interface RO is connected with a B1 interface of an isolation chip U3 at the input side of the RS-485 receiving and transmitting chip U2, a driving input interface DI is connected with a B2 interface of the isolation chip U3, and a receiving/driving enabling interface RE/DE is short-circuited and then connected with VCC; The output side of the RS-485 transceiver chip U2 is connected with a bus terminal matching resistor in a bridging mode between a differential bus interface A and a differential bus interface B of the RS-485 transceiver chip U2, the differential bus interface A is connected to a power supply of the RS-485 transceiver chip U2 through a pull-up resistor, the differential bus interface B is connected to the ground through a pull-down resistor, and ESD protection diodes are respectively connected in parallel among the differential bus interface A, the differential bus interface B and the ground. As a preferable technical scheme, the isolation chip U3 is used for realizing signal isolation between the RS-485 side and the main control chip; On the RS-485 side, signal interfaces B1 and B2 are respectively connected with an output and receiving interface RO and a driving input interface DI of an RS-485 transceiver; on the main control chip side, signal interfaces A1 and A2 are respectively connected with TXD and RXD pins of a main control chip U1, and VCCA is connected with a 3.3V power supply on the main control chip side. The 485 interface J1 is provided with a 4 Pin terminal, wherein a pin 1 is an external power supply/output pin and provides a 5V power supply for an RS-485 transceiver chip U2, a pin 2 is an A line of RS485 communication and is connected with a differential bus interface A of the RS-485 transceiver chip U2, a pin 3 is a B line o