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gps_locosys_hawk_a1.md

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LOCOSYS Hawk A1 GPS/GNSS

The LOCOSYS HAWK A1 GPS/GNSS receiver 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)
  • Build-in super capacitor to reserve system data for rapid satellite acquisition
  • Three LED indicator for Power, PPS and Data transmit

Hawk A1

Purchase

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_TEL_2_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 auxillary 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_TEL_2_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).

GPS cable

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

Hawk A1 LEDs

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
  • Positionaing 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.

Further info