The encoded tc data field may have been randomized

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: that were appended to meet codeblock length constraints. The encoded TC data field may have been randomized before encoding, or not randomized, as selected for the mission. (For brevity, “random” is used in place of “pseudo-random” throughout this document. See Annex A.) CCSDS 201.0-B-3 Page 3-2 June 2000 CCSDS RECOMMENDATION FOR TELECOMMAND: CHANNEL SERVICE 3.2.2.3 Tail Sequence. The CLTU Tail Sequence field is a data structure which is constructed specifically to be a noncorrectable sequence which delimits the end of a CLTU by stopping the decoding process. The Tail Sequence shall have the same length as the TC Codeblock that is being used. The Tail Sequence shall consist of leading octets having the pattern 11000101, repeated as necessary until the next-to-last octet of the tail sequence field is reached. The last octet completes the tail sequence field, and always has the pattern 01111001. Therefore, the bit pattern for the standard tail sequence may be described as follows: Tail Sequence Pattern 11000101 1...
View Full Document

Ask a homework question - tutors are online