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Frequently Asked Questions: ANTARIS FAQ

Topic

 10What is the decoding of the sub frames for SBAS satellites in the RXM-SFRB message?

What is the decoding of the sub frames for SBAS satellites in the RXM-SFRB message?



The 250 bit are output in exactly the same order as they are received from the satellites. The first bit from the satellite (let's call it MSB) is bit 31 (MSB) of DWRD0, etc. Bit 224 is bit 0 of DWRD6. Sub frame bit 225 is then bit 25 of DWRD7, Sub frame bit 226 is bit 24 of DWRD7. The remaining bits 23 to 0 of DWRD7 are the parity bits. Please note, bit 31 to 27 of DWRD7 are reserved and can contain garbage.

Please note, the number format is a signed 32-Bit integer in Little Endian Format. But this is true for SBAS and GPS satellites, so theres is no difference between GPS and SBAS satellites in this respect.

Please refer to the ANTARIS protocol specification for further information.



 
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last modified: 10.06.2005

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