L76K GNSS HAT for Raspberry Pi

This HAT for your Raspberry Pi supports GPS, BeiDou (BDS), GLONASS and QZSS systems, and allows multi-system combined or single-system independent positioning. The board offers fast positioning, high accuracy, and low power consumption, and supports AGNSS (Assisted GNSS), a technology that dramatically speeds up and improves satellite positioning by downloading critical orbital data via mobile networks or Wi-Fi rather than slow satellite links. It has a built-in Low-Noise Amplifier (LNA) for improved reception sensitivity, and built-in Surface Acoustic Wave (SAW) Filter for enhanced noise reduction performance. There is a holder for an ML1220 rechargeable battery (battery not included - do not use single use batteries!), for preserving ephemeris information and hot starts. Four LEDs indicate the module operating status, and a standby mode switch. The board comes with a separate GPS antenna (see images), riser GPIO header, Micro-USB cable and metal standoff fixings. Raspberry Pi not included. What's Onboard?

* L76K module

* CP2102

* CAT24C32

* RT9193-33 Power chip

* GNSS configuration button

* Standby mode switch

* Status indicators

* Raspberry Pi 40-pin GPIO header

* USB to UART port

* GNSS antenna connector

* Battery holder

* Supports an ML1220 rechargeable cell for preserving ephemeris information and enabling hot starts

* UART selection jumper

* A: Control the L76K via USB to UART

* B: Control the L76K via Raspberry Pi

* C: Access the Raspberry Pi via USB to UART

Features

* Designed for Raspberry Pi (any 40-pin model i.e. Pi 5, 4, 3 etc)

* Supports GPS, BeiDou (BDS), GLONASS and QZSS

* Combined or independent positioning modes

* AGNSS support

* Built-in Low-Noise Amplifier

* Built-in SAW filter

* ML1220 rechargeable cell holder (battery not included)

* Four status LEDs

* Standby mode switch

* GPS antenna included

Specifications

GNSS GPS/GLONASS/BDS/QZSS

Chip platform AT6558R

L1 band receiver channels 32 tracking / 72 acquisition

SBAS N/A

A-GNSS Supported

Acquisition sensitivity -148dBm

Re-acquisition sensitivity -160dBm

Tracking sensitivity -162dBm

Cold start TTFF 30s autonomous 5.5s with AGNSS

Hot start TTFF 2s

Position accuracy 2.0m CEP

Speed accuracy 0.1m/s

Maximum acceleration accuracy 0.1m/s²

Timing accuracy 30ns

Communication interface UART

Baud rate 4800–115200bps, 9600bps by default

Update rate 1Hz default, 5Hz maximum

Protocols NMEA 0183, CASIC Proprietary Communication Protocol

Power supply voltage 5V

Overall current consumption <55mA @ 5V, continue mode

Operating temperature -40°C to 85°C

Dimensions 65×30.5mm

Resources

* Product wiki

Pinout

Package Contents

* 1x L76K GNSS HAT for Raspberry Pi

* 1x GPS Antenna

* 1x GPIO riser header

* 1x Micro-USB cable

* 1x Fixing pack

Raspberry Pi not included