DM-0089

Description

Driver to be used to decode roll-pitch-heave observations from a Seapath (or MRU) motion reference unit outputting so-called Sounder Sentence ASCII messages.

• No heading observation is part of the message, only roll, pitch and heave.

• There are three versions of this driver, a serial one, a network UDP and a network TCP version. Decoding is the same for all. 

• When your motion reference unit outputs the NMEA $PSXN format, please use the driver as found in the related pages.

Driver Information

Database Setup

• In order to decode the motion, add to your template setup a Pitch Roll Heave Sensor system and select driver
  "Seapath MRU Sounder Sentence" or "Network (UDP/TCP) - Seapath MRU Sounder Sentence" for the network variant.
  
  Fill in the correct I/O parameters and press Next to go to the next wizard page.

  
  

  
  

  Leave the settings at the defaults on the Motion Sensor Parameters page:

  Unit: Degrees, Roll convention: Positive heeling to starboard, Pitch convention: Positive bow up and Heave Sign: Positive upwards.

  The driver automatically converts the decoded values to these conventions.

Decoding Notes

• There is no quality information in the Sounder Sentence message about the observations, except for a warning character at column 14: Normally a space character, but when data is unstable it will be a '?' character.
  Qinsy will not use data which is marked as unstable. When this happens the observation quality indicators will be -1.0 instead of 0.0. Note that these quality indicators can be monitored using an Observation Physics Display.

• There is no time information inside the message, so timing of the observation will be at time-of-arrival.

• The driver will automatically convert the decoded values to the default Qinsy convention and unit.