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Spatial FOG Reference Manual
Page 120 of 144
Version 2.3
03/05/2018
using aircraft airspeed. The packet should contain diferential 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.
External Pitot Pressure Packet
Packet ID 56
Length 8
Field
#
Bytes
Ofset
Data
Type
Size Description
1 0 fp32 4 Diferential pressure (Pascals.)
2 4 fp32 4 Outside air temperature (deg C)
Table 78: External pitot pressure packet
13.9.38 Wind Packet
This packet provides Spatial FOG's current 2D wind velocity. These values are only
valid when external air data is provided to Spatial FOG. This can be either through the
External Pitot Pressure Packet, the External Air Data Packet or when a pitot tube is
interfaced to one of the GPIO pins. When this packet is written to the device, it
disables the wind estimation filter and the wind values provided are used statically.
Wind Packet
Packet ID 57
Length 12
Field
#
Bytes
Ofset
Data
Type
Size Description
1 0 fp32 4 Wind velocity north (m/s)
2 4 fp32 4 Wind velocity east (m/s)
3 8 fp32 4 Wind velocity standard deviation (m/s)
Table 79: Wind packet