新型的卫星导航信号体制设计  

New signal system design for satellite navigation system

作　　者：薛睿[1] 徐锡超[1] 魏强[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《计算机应用》2014年第6期1573-1577,共5页journal of Computer Applications

基　　金：中国博士后科学基金资助项目(2011M500640);黑龙江省留学归国人员科学基金资助项目(LC2013C22);中央高校基本科研业务费专项资金资助项目(HEUCF140807)

摘　　要：为进一步提高导航信号精度、频带效率及增强导航系统可靠性,提出一种基于低密度奇偶校验(LDPC)码的最小频移键控—二进制偏移载波(MSK-BOC)调制信号体制(LDPC-MSK-BOC)。以Compass和GPS信号典型参数为例,采用功率谱密度、码跟踪误差、多径误差包络、误比特率、解调抗窄带/匹配谱干扰品质因数、码跟踪抗窄带/匹配谱品质因数、谱分离系数等参数来评估二进制偏移载波(BOC)和MSK-BOC两种信号的导航性能。理论分析和仿真结果表明:在频带资源受限的条件下,与BOC信号体制相比,所提出的信号体制在码跟踪精度和抗多径方面有更好的性能;同时可进一步提高系统的可靠性,改善频带利用率。In order to flJrther improve the precision of navigation signal, band efficiency and the reliability performance for navigation systems, a new signal system adopted Minimum Shift Keying （MSK） with Binary Offset Carrier （BOC） based on Low Density Party Check （LDPC） codes was presented, which was called LDPC-MSK-BOC signal system. The navigation performances of the BOC and MSK-BOC were evaluated based on the parameters of Compass and GPS typical signals, which were scaled with power spectral density, code tracking error, multipath error envelope, bit error rate, anti-narrowband jamming merit factor and anti-matched spectrum jamming merit factor for demodulation processing, anti-narrowband jamming merit factor and anti-matched spectrum jamming merit factor for code tracking processing, and spectral separation coefficient. The theoretical analysis and simulation show that the proposed system has better performance in the field of code tracking precision and anti-muhipath compared with BOC signal system under the limited spectrum resource condition. Meanwhile, the signal structure can further improve system reliability and band efficiency.

关 键 词：卫星导航 信号体制 低密度奇偶校验码 最小频移键控 二进制偏移载波 

分 类 号：TN967.1[电子电信—信号与信息处理]