System Description

System Description and Installation Manual for MXS ICD10004-01

Report Times of Applicability

The Report Times of Applicability field contains time stamps created when an ADS-B message is

received by the message processor or when the message processor updates the SV report. The time

stamp is based on the Transponder’s established receiver unit time. Each TOA is formatted in units of

1/128 second.

The first two bytes of this message (RA0 and RA1) contain the time of applicability for the estimated

position field. The value is the time stamp created when the SV report was updated with current

estimated position data.

The next two bytes of this message (RA2 and RA3) contain the position time of applicability. The

value is the time stamp created when the Airborne or Surface Position Message was received.

The last two bytes of this message (RA4 and RA5) contain the velocity time of applicability. The

value is the time stamp created when the Airborne Velocity Message or Surface Position Message was

received.

Latitude

Byte Offset Byte Name Field Description

EL0 EL0 EL1 EL2 Latitude

EL1 0x28

0x19

0xCB

0x00

0x28

0x54

0x80

0x60

0xE9

56.252747 Degrees

35.378036 Degrees

-74.064825 Degrees

EL2

Latitude

The data is sent as a 24-bit 2’s complement number:

SMdddddd dddddddd dddddddL

The S bit indicates whether the data is positive (North) or negative (South). If the S bit is set to “ONE”

then the data is negative, if set to “ZERO” then the data is positive. The resolution of the M bit is 90

degrees. The resolution of the L bit is 180/2

(~0.0000215) degrees.