Geoid Height Packet; Rtcm Corrections Packet; External Pitot Pressure Packet - Advanced Navigation Spatial Dual Reference Manual

13.9.34

Geoid Height Packet

This packet provides the offset between the WGS84 ellipsoid and the EGM96 geoid
model at the current location. This can be used to determine mean sea level height
and also depth through the following equations:
Mean Sea Level Height = Height – Geoid Height
Depth = Geoid Height – Height
Packet ID
Length
Field Bytes
# Offset
1 0
Table 77: Geoid height packet
13.9.35

RTCM Corrections Packet

This packet is used to encapsulate RTCM v2, RTCM v3 or CMR correction data to be
sent to Spatial Dual's internal GNSS receiver for differential or RTK GNSS functionality.
Packet ID
Length
Field Bytes
# Offset
1 0
Table 78: RTCM corrections packet
13.9.36

External Pitot Pressure Packet

This packet is used to interface a pitot tube to Spatial Dual for enhanced navigation
using aircraft airspeed. The packet should contain differential pressure in Pascals. If
outside air temperature is available it should be set in the message for increased
accuracy, otherwise this field should be set to 15 degrees.
Geoid Height Packet
Data Size
Type
fp32 4
RTCM Corrections Packet
Data Size
Type
Spatial Dual Reference Manual
Page 115 of 137
Version 2.3
12/04/2016
54
4
Description
Geoid height (m)
55
Variable, up to 255 bytes
Description
RTCM corrections data