航天器工程2009，Vol.18Issue(3)：72-76,5.
LDPC码在卫星导航系统中的应用
Application of LDPC Codes in Satellite Navigation Systems
摘要
Abstract
Low Density Parity Check (LDPC) codes are being accepted in many applications as a type of advanced channel codes approaching Shannon limit. For example, LDPC codes have been used in DVB-S2 and will be adopted in telemetry channel coding standard of CCSDS. This paper discusses an application of LDPC codes in satellite navigation systems, including encoding on spacecraft and decoding in user receivers.GPS Joint Program Office has presented LDPC codes of L1 message structure in Interface specification (Draft IS-GPS-800, Navstar GPS Space Segment/User Segment LIC Interfaces, 19 April 2006). Subframe2 and 3 shall utilize 24-bit Cyclic Redundancy Check (CRC) algorithm with a separate CRC for each subframe. Each of the two subframes shall be further encoded using LD-PC codes with length 1 200/548 and rate 1/2.This paper gives a different kind of LDPC codes from above FEC codes with the same length and rate. They exhibit excellent decoding performance, simple encoding structure and low deco-ding complexity. Another advantage is that the parity check matrix can be denoted without a se-ries of redundant tables. Finally, this construction method of LDPC codes can be extended to other satellite navigation systems, such as Galileo system of Europe and Compass system of China.关键词
卫星导航/GPS/LDPC码/准循环码Key words
satellite navigation/GPS/LDPC codes/quasi-cyclic codes分类
信息技术与安全科学引用本文复制引用
何善宝,刘崇华,林益明..LDPC码在卫星导航系统中的应用[J].航天器工程,2009,18(3):72-76,5.基金项目
国家重大科技专项工程 （）
