罗兰-C数据解调与解码技术研究
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摘要
罗兰-C数据通信已经成为罗兰-C系统扩展应用的重要方向,BPL长波授时系统和"长河二号"系统相继采用"Eurofix"技术实现了通信导航一体化。在对罗兰-C数据调制编码方式——三态脉冲位移字平衡调制、RS(Read-Solomon)和CRC(cycli-cal redundancy check)编码技术研究的基础之上,提出了一种基于交叉相关检测的罗兰-C数据解调、解码方法,并从数据获取、解调判决准则、RS纠错解码和CRC循环校验等方面详细论述了罗兰-C数据解调与解码的具体方法和算法流程,解决了罗兰-C接收机数据信息接收的关键技术。
Loran-C data communication has become an important direction of extending the application of Loran-C system.The BPL long wave time service system and the "Changhe 2" system have adopted the "Eurofix" technology to achieve the communication navigation integration.This article is based on the research of Loran-C data modulation encoding scheme-3-level pulse position balance modulation,Read-Solomon(RS) and cyclical redundancy check(CRC) encodings.A Loran-C data demodulation and decoding method has been presented based on cross-correlation detection;and the specific method and algorithm of Loran-C data demodulation and decoding are discussed in detail from the aspects of data acquisition,demodulation decision guideline,RS error correction decoding and CRC checking.The key technologies for Loran-C receiver to receive data messages have been solved.
Loran-C data communication has become an important direction of extending the application of Loran-C system.The BPL long wave time service system and the "Changhe 2" system have adopted the "Eurofix" technology to achieve the communication navigation integration.This article is based on the research of Loran-C data modulation encoding scheme-3-level pulse position balance modulation,Read-Solomon(RS) and cyclical redundancy check(CRC) encodings.A Loran-C data demodulation and decoding method has been presented based on cross-correlation detection;and the specific method and algorithm of Loran-C data demodulation and decoding are discussed in detail from the aspects of data acquisition,demodulation decision guideline,RS error correction decoding and CRC checking.The key technologies for Loran-C receiver to receive data messages have been solved.
引文
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[2]YANG S H,LEE C B,LEE Y K.Accuracy improvementtechnique for timing application of Loran-C signal[J].IEEE Transactions on Instrumentation and Measurement,2011,60(7):2648-2654.
[3]ZHOU L L,XI X L.LF ground wave propagation over ir-regular terrain[J].IEEE Transactions on Antennas Prop-agation,2011,59(4):1254-1260.
[4]陈洪卿.北斗系统与中国PNT应用平台[J].电子测量与仪器学报,2010,24(12):1075-1081.CHEN H Q.Beidou satellite navigation system and theapplication foundation of positioning,navigation&timingin China[J].Journal of Electronic Measurement and In-strument,2010,24(12):1075-1081.
[5]SONG S P,CHOI H H.Verification of GPS aided errorcompensation method for eLoran using raw TOA measure-ments[C].The 11th International Conference on Con-trol,Automation and Systems,KINTEX,Gyeonggido,Korea,2011:1620-1624.
[6]吴海涛,王丹妮,边玉敬.Cs Sync1000型罗兰-C接收机系统时延的测量方法[J].电子测量与仪器学报,2002,16(3):22-27.WU H T,WANG D N,BIAN Y J.Delay measurementmethods of Cs Sync 1000 Loran-C receiver system[J].Journal of Electronic Measurement and Instrument,2002,16(3):22-27.
[7]BALOV A V.Radio navigation present and future[J].Gyroscopy and Navigation,2010,1(3):224-235.
[8]OFFERMANS G W A.The eurofix datalink concept:re-liable data transmission using Loran-C[C].Proceedingsof the 25th Annual Technical Symposium of the Interna-tional Loran Association.San Diego,CA,USA,1996:3-7.
[9]LO S C,PETERSON B B,ENGE P K.Loran data mod-ulation:A primer[J].Aerospace and Electronic SystemsMagazine,IEEE,2007,22(9):31-51.
[10]苏建峰,吴海涛.罗兰-C数据链在BPL授时中的应用研究[J].天文学报,2006,47(4):450-455.SU J F,WU H T.The study of Loran-C datalink applica-tion in BPL time service[J].Acta Astronomical Sinica,2006,47(4):450-455.
[11]段建文,王玉林.BPL时码发播和自主授时方法[J].时间频率学报,2008,31(2):98-103.DUAN J W,WANG Y L.BPL time code transmissionand independent time service[J].Journal of Time andFrequency,2008,31(2):98-103.
[12]吴斌,李垚,张多利.基于RS编解码Flash控制器的SOC设计[J].电子测量技术,2011,34(1):12-17.WU B,LI Y,ZHANG D L.Based on reed solomon codedesign of a Flash memory controller[J].ElectronicMeasurement Technology,2011,34(1):12-17.
[13]汪海山,马骋,贾惠波.低复杂度Reed-Solomon解码器在地震勘探仪器中的应用[J].仪器仪表学报,2010,31(7):1632-1637.WANG H SH,MA CH,JIA H B.Application of lowcomplexity Reed-Solomon decoder in seismic exploration[J].Chinese Journal of Scientific Instrument,2010,31(7):1632-1637.
[14]刘岩俊,闫海霞.HDLC通讯协议中CRC的应用[J].电子测量技术,2010,33(3):21-23.LIU Y J,YAN H X.Application of CRC during HDLCprotocol[J].Electronic Measurement Technology,2010,33(3):21-23.
[15]TONG H P,XU H G.Horizontal dilution of precisionanalysis for Loran C/Beidou integrated navigation system[C].Third International Symposium on Electronic Com-merce and Security,Guang zhou,China,2010:167-170.
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