System Description

System Description and Installation Manual for MXS ICD10004-01
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Table 0-5458 ADS-B Air Referenced Velocity Report Message Payload Structure Detail
Report Type and Structure ID
Byte Offset
Byte Name Field Description
00
RS0
RS0 (MSN) RS0 (LSN) RS1 Report Type and Structure ID
01
RS1 0x4 0x0 0x07 Air Referenced Velocity Report; All data fields are supported
Report Type and Structure ID
The Most Significant Nibble (MSN) of the byte RS0 contains the Report Type. For the Air Referenced Velocity
Report, this field will always contain a value of 0x4. This identifies the report as an Air Referenced Velocity Report.
The remaining data constitutes the Structure ID, which indicates the fields that are being reported in the current
message. If the bit for the field is set to “ONE”, then the data field is available and included in the current report. If
the bit is set to “ZERO”, this indicates that the field is not reported for the current message and the Mode Status
message will not include that field. The Mode Status Message will concatenate the next field to be included into the
report, following the previous reported field. This is performed for each data field that is reported.
The below table from D0-260B outlines the Structure ID layout:
Byte Name Bit # Air Referenced Velocity Data Parameter to be Reported
RS0 (LSN)
0-3 Reserved
RS1
3-7
2
1
0
Reserved
Airspeed
Airspeed Type and Validity
Heading While Airborne
Validity Flags
Byte Offset
Byte Name Field Description
02
VF0
Byte Bit Data Field(s)
VF0
2-7
1
0
Reserved
Airspeed
Heading
Validity Flags: These flags indicate whether or not the data contained in the specified field is valid
or not. If the bit is set to “ONE” then the data field contains valid information. If the bit is set to
“ZERO” then the data field contains invalid information.