HEX/ProfiCNC Here2 GPS (Discontinued)

WARNING

This has been superseded by the Cube Here 3

The Here2 GPS receiver is an update to the Here GPS module from HEX.

Main features include:

• Concurrent reception of up to 3 GNSS (GPS, Galileo, GLOSNASS, BeiDou)
• Industry Leading -167 dBm navigation sensitivity
• Security and integrity protection
• Supports all satellite augmentation systems
• Advanced jamming and spoofing detection

Where to Buy

• ProfiCNC (Australia)
• Other resellers

Configuration

Setup and use on PX4 is largely plug and play.

INFO

• If the GPS is not detected then update the Here2 firmware.
• If the GPS is detected but does not work, attempt the process outlined in allocating node uavcan ID.

Wiring and Connections

The Here2 GPS comes with an 8 pin connector that can be inserted directly into the Pixhawk 2 GPS UART port.

The Pixhawk 3 Pro and Pixracer have a 6 pin GPS port connector. For these controllers you can modify the GPS cable (as shown below) to remove pin 6 and 7.

Pin 6 and 7 are for the safety button - these can be attached as well if needed.

Pinout

The Here2 GPS pinout is provided below. This can be used to help modify the connector for other autopilot boards.

pin	Here2 GPS	pin	Pixhawk 3 Pro GPS
1	VCC_5V	1	VCC
2	GPS_RX	2	GPS_TX
3	GPS_TX	3	GPS_RX
4	SCL	4	SCL
5	SDA	5	SDA
6	BUTTON	-	-
7	BUTTON_LED	-	-
8	GND	6	GND

Specification

• Processor: STM32F302
• Sensor
  • Compass, Gyro, Accelerometer: ICM20948
  • Barometer: MS5611
• Receiver Type: 72-channel u-blox M8N engine, GPS/QZSS L2 C/A, GLONASS L10F, BeiDou B11, Galileo E1B/C, SBAS L1 C/A: WAAS, EGNOS, MSAS, GAGAN
• Navigation Update Rate: Max: 10 Hz
• Positionaing Accuracy: 3D Fix
• Time to first fix:
  • Cold start: 26s
  • Aided start: 2s
  • Reacquisition: 1s
• Sensitivity:
  • Tracking & Navigation: -167 dBm
  • Hot start: -148 dBm
  • Cold start: -157 dBm
• Assisted GNSS
  • AssistNow GNSS Online
  • AssistNow GNSS Offline (up to 35 days)
  • AssistNow Autonomous (up to 6 days)
  • OMA SUPL& 3GPP compliant
• Oscillator: TCXO (NEO-8MN/Q)
• RTC crystal: Build in
• ROM: Flash (NEO-8MN)
• Available Antennas: Active Antenna & Passive Antenna
• Signal Integrity: Signature feature with SHA 256
• Protocols & Interfaces:
  • UART/I2C/CAN: JST_GH Main interface, Switch internally.
  • STM32 Main Programming Interface: JST_SUR