Connecting to a GPS Receiver Input Signal


External GPS receiver signals provide a way for the system to acquire knowledge of the system position and velocity in the Earth’s reference frame. This page serves as a placeholder for the description of the connection to the GPS receiver. In addition to connecting to the receiver, the unit needs to know what format the input signal will be (for example, NMEA or NovAtel) and what the message will be (GGA vs VTG, etc.).

Connecting a GPS Receiver

To connect the system to an external GPS receiver, the first step is to connect the TX and RX lines to the appropriate pins for the device being used:

  1. OpenIMU300ZI: Pins 17 and 19 serve as the GPS input pins (OpenIMU300ZI Connector Pinout)
  2. OpenIMU330BI: Pin X and Y serve as the GPS input pins (OpenIMU330BI Connector Pinout)
  3. OpenIMU300RI: No pin available for connection to GPS receiver

Configuration Settings

The second step in connecting to a GPS receiver is to configure the firmware to use the signals. An ideal place to perform this task is during initialization of the user-generated algorithm, commonly executed in dataProcessingAndPresentation.c.

Post-Connection Operations

Once the system is configured to accept and decode the GPS receiver input, …

  1. Function1()
  2. Function2()