# LOCOSYS Hawk A1 GPS/GNSS
The LOCOSYS HAWK A1 GPS/GNSS receiver (opens new window) is a dual frequency multi-constellation GNSS/GPS receiver compatible with PX4.
Main features include:
- Concurrent reception of L1 and L5 band signals
- Supports GPS, GLONASS,BEIDOU, GALILEO, QZSS
- Capable of SBAS (WAAS, EGNOS, MSAS, GAGAN)
- Support 135-channel GNSS
- Fast TTFF at low signal level
- Free hybrid ephemeris prediction to achieve faster cold start
- Default 5Hz, up to 10 Hz update rate (SBAS at 5Hz update rate only)
- Built-in super capacitor to reserve system data for rapid satellite acquisition
- Three LED indicator for Power, PPS and Data transmit
# Where to Buy
- LOCOSYS (opens new window) (Taiwan)
# Configuration
You can use the Hawk A1 as either main (primary) or secondary GPS system. The PX4 parameters should be set as below for each case.
# Main GNSS
To use the Hawk A1 your main GPS device:
| Parameter | Value | Description |
|---|---|---|
| GPS_1_CONFIG | 102 (Telem 2 or another available serial port) | Configure main GPS port |
| GPS_1_PROTOCOL | 1 (u-blox) | Configure GPS protocol |
| SER_TEL2_BAUD | 230400 | Configure the serial port baudrate (here the GPS is connected to TELEM2 for instance) |
# Secondary GNSS
To use the Hawk A1 as an auxiliary GPS device (in addition to the main GPS):
| Parameter | Value | Description |
|---|---|---|
| GPS_2_CONFIG | 102 (Telem 2 or another available serial port) | Configure main GPS port |
| GPS_2_PROTOCOL | 1 (u-blox) | Configure GPS protocol |
| SER_TEL2_BAUD | 230400 | Configure the serial port baudrate (here the GPS is connected to TELEM2 for instance) |
# Wiring and Connections
The Locosys GPS comes with an 6-pin JST-GH Pixhawk-standard connector that can be inserted directly into either the GPS1 UART port (or GPS2 UART ports from Pixhawk FMUv5).
# Pinout
The LOCOSYS GPS pinout is provided below. This can be used to help modify the connector for other autopilot boards.
| pin | Locosys GPS | pin | Pixhawk GPS 2 |
|---|---|---|---|
| 1 | VCC_5V | 1 | VCC |
| 2 | GPS_RX | 2 | GPS_TX |
| 3 | GPS_TX | 3 | GPS_RX |
| 4 | NC | 4 | SDA |
| 5 | NC | 5 | SCL |
| 6 | GND | 6 | GND |
# Status LEDs
| Color | Name | Description |
|---|---|---|
| Green | TX Indicator | GNSS Data transmission |
| Red | Power Indicator | Power |
| Blue | PPS | Precise Positioning Service active |
# Specifications
- Receiver Type: 135-channel LOCOSYS MC-1612-V2b engine, GPS/QZSS L1 C/A, L5C, GLONASS L1OF, BeiDou B1I, B2a Galileo:E1, E5a SBAS L1 C/A: WAAS, EGNOS, MSAS, GAGAN
- Navigation Update Rate: Max: 5Hz default Max: 10 Hz
- Positioning Accuracy: 3D Fix
- Time to first fix:
- Cold start: 28s
- Aided start: EASY
- Sensitivity:
- Tracking & Navigation: -165 dBm
- Assisted GNSS: EASY DGPS
- Oscillator: 26Mhz TCXO
- RTC crystal: 32.768KHz
- Available Antennas: L1+L5 multi frequency antenna
- Signal Integrity: L1+L5 GPS GLONASS GALILEO BEIDOU QZSS SBAS
- Protocols & Interfaces:
- UART/I2C: JST_GH Main interface, Switch internally.