Altitude (1 Hz, 4 byte)
Note
A 3D-fix is required to obtain a valid altitude.
The altitude is defined as the height above the WGS84 reference ellipsoid (an ellipsoid used by GPS to approximate the shape of the earth). Note that several ways of defining altitude exist[1].
Configuration file fields
This section is autogenerated from the Rule Schema.
GNSS altitude (1000 ms) output.altitude
State output.altitude.state
Type |
Default |
Options |
|---|---|---|
integer |
1 |
Disable: |
ID Format output.altitude.id_format
ID format of the message
Type |
Default |
Options |
|---|---|---|
integer |
0 |
Standard (11-bit): |
Message ID (hex) output.altitude.id
ID of the message in hex. Example: 00435354.
Type |
Default |
|---|---|
string |
01 |
Trigger method output.altitude.trigger
Transmission trigger method. Push: Signal is periodically transmitted. Poll: Signal is transmitted on request
Type |
Default |
Options |
|---|---|---|
integer |
0 |
Push: |
Frame layout
Note
The frame layout is defined in the CANmod.gps DBC file
The altitude frame contains altitude information.
Name |
Bitpos |
Length |
Factor |
Offset |
Min |
Max |
Unit |
|---|---|---|---|---|---|---|---|
AltitudeValid |
0 |
1 |
1 |
0 |
0 |
1 |
|
Altitude |
1 |
18 |
0.1 |
-6000 |
-6000 |
20000 |
m |
AltitudeAccuracy |
19 |
13 |
1 |
0 |
0 |
8000 |
m |
AltitudeValid
The AltitudeValid signal can take one of the following values:
0: Invalid
1: Valid
Decoding example
Raw altitude frame payload:
Hex:
A9D82900(byte 0 to the left)Hex reversed:
0029D8A9(byte 0 to the right)Bin:
0000000000101 001110110001010100 1(bit 0 to the right)
AltitudeAccuracy(13) |
Altitude(18) |
AltitudeValid(1) |
|
|---|---|---|---|
Raw (bin) |
0000000000101 |
001110110001010100 |
1 |
Raw (dec) |
5 |
60500 |
1 |
Scaled |
5 |
6050.0 |
1 |
Offset |
5 |
50.0 |
1 |
The altitude of 50.0 m is valid with an accuracy of 5 m.