Galileo OS SIS ICD.indd - GSA - Europa

Start bit = 1
Part (5/8) Part (6/8) Part (7/8) Part (8/8)
Long RLM
SAR RLM
data
Parameters
(2/5)
Spare SAR Data
Start bit = 0
Long RLM
SAR RLM
data
Parameters
(3/5)
Table 59. SAR Long RLM
In case no valid SAR data is to be transmitted, the satellite generates the spare SAR
data fi eld according to Table 60.
SAR Data Total
Start Bit Spare
(bits)
1 21 22
Table 60. Spare SAR Data
A SAR receiver will use the sequence of start bits (and only these) to identify SAR data
parts belonging to SAR RLMs. Every time if both the currently received start bit and the
start bit of the previous SAR data part are equal to one, the previous data part does not
contain SAR relevant data.
Start bit = 0
Long RLM
SAR RLM
data
Parameters
(4/5)
© European Union 2010
Document subject to terms of use and disclaimers p. ii-iii
OD SIS ICD, Issue 1, February 2010
Start bit = 0
Long RLM
SAR RLM
data
Parameters
(5/5)
1 1 20 1 1 20 1 1 20 1 1 20
22 22 22 22
43