GNSS Expansion Board GPS QZSS Global Positioning Serial Port Module For Jetson Nano

Documents:

Manual: Click here to open

Software: Click here to open

Code: Click here to open: https://www.waveshare.com/wiki/File:L76X_GPS_HAT_code.7z

Datasheet: Click here to open

Schematic: Click here to open

Introduction:

This product is a Raspberry Pi expansion board with GNSS (Global Navigation Satellite System) function, supports GPS, BD2 and QZSS positioning systems, and has the advantages of small size, low power consumption, and fast positioning. Take me, your Raspberry Pi will be able to easily achieve global positioning

The program provides a calibration algorithm that supports Baidu Maps with high accuracy.

Parameters:

Receiving channels: 33 tracking channels, 99 acquisition channels and 210 PRN channels

Receiving signal: GPS, BD2 and QZSS

Support SBAS: WAAS, EGNOS, MSAS, GAGAN

Signal frequency band: GPS L1 (1575.42Mhz) BD2 B1 (1561.098MHz) C/A Code

Capture time: Cold start: 10S (fastest); Hot start: 1S

Capture sensitivity: -148dBm

Tracking sensitivity: -163dBm

Recapture capture sensitivity: -160dBm

Positioning accuracy: <2.5mCEP

The highest altitude: 18000(M)

Maximum speed: 515m/s

Logic voltage: 3.3/5V

Communication interface: UART

Serial communication baud rate: 4800~115200 (default 9600)

Update rate: Maximum 10Hz (default 1HZ)

Communication protocol: NMEA 0183 /PMTK

Working voltage: 2.7V~5V (input power from 5V pin)

Working current: 13mA

Working temperature -40℃ ~ 85℃

Product size: 65X30.5(mm)

GNSS parameters:

Signal frequency band: GPS L1 (1575.42Mhz), BD2 B1 (1561.098MHz)

Number of channels: 33 tracking channels, 99 acquisition channels and 210 PRN channels

C/A code

SBA: WAAS, EGNOS, MSAS, GAGAN

Horizontal positioning accuracy:

Autonomous positioning: <2.5mCEP

First positioning time @ -130dBm (EASY™ function enabled):

Cold start: <15s

Warm start: <5s

Hot start: <1s

Sensitivity:

Capture: -148dBm

Tracking: -163dBm

Recapture: -160dBm

Dynamic performance:

Altitude (max): 18000m

Speed (max): 515m/s

Acceleration (max): 4G

Package includes:

1 x L76X GPS HAT

1 x GPS External Antenna (B)

1 x USB cable type A male port to micro male port

1 x RPi copper pillar package (2PCS set)

1 x 2*20PIN long row seat

Device introduction:

1. L76B module

2. CP2102, USB to UART chip

3. CAT24C32, EEPROM memory chip

4. RT9193-33, power chip

5. Backup mode wake-up button

6. Standby mode switch

7. Status indicator; RXD/TXD: serial port transceiver indicator; PPS: GPS status indicator; PWR: power indicator

Interface introduction:

8. Raspberry Pi GPIO interface for easy access to Raspberry Pi

9. USB TO UART interface

10. GNSS antenna interface

11. ML1220 battery holder, can be connected to ML1220 rechargeable battery, used to save data and hot start

Jumper description:

12. UART selection jumper cap

A: USB to serial port control L76B

B: Raspberry Pi controls L76B

C: USB to serial port to access Raspberry Pi

Standby mode: Use the STANDBY switch to make the module enter the standby mode, which is a low power consumption mode. In standby mode, the module stops satellite search and navigation, no positioning information (NMEA message) is output, but it can be accessed through PMTK commands or any other data.

Backup mode: Press FORCE ON to exit the backup mode. Compared with standby mode, the power consumption in backup mode is lower. In the backup mode, the module will stop acquiring and tracking satellites. UART1 is not accessible. However, the backup memory in the RTC domain (including all GPS information and a few user configuration variables required for quick start) is obtained. Support EASYTM self-generated orbit prediction function, which can realize fast positioning. In this mode, the current of the module is about 7uA. In backup mode, the only way to wake up is to pull the FORCE_ON pin high

CAT24C32: The function of this chip is to provide an ID EEPROM for the Raspberry Pi (including vendor information, GPIO mapping and valid device tree information). The purpose of adding this is because of the micro-HAT (uHAT) specification introduced by Raspberry Pi (specific reference). To ensure consistency and compatibility with future Raspberry Pi add-on boards, and provide a better user experience.

Note: we have not used it here, don't bother