高动态条件下PN码扩谱接收机的频率跟踪策略
Frequency Tracking Algorithms for PN Spread Spectrum Receiver in High Dynamic Circumstance
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摘要: 在UHF,SHF频段上,机载或弹载PN码扩谱接收机由于接收机载体的高动态特性,导致接收信号具有显著的多普勒频移的不确定性。该文根据这一实际特点,对几种载波环捕获与跟踪数字系统进行了研究。在软件上,结合码环的串行滑动相关捕获算法与全时间超前-滞后非相干跟踪算法,既达到了载波频率的快速同步,保证了对数据的实时解扩与解调,同时使系统具有很好的灵活性,方便了二次开发和升级。
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关键词:
- 扩谱接收机; 多普勒频移; 自动频率控制
Abstract: At UHF or SHF, the notable effects of Doppler due to platform dynamics must be taken into account. This paper researches on several carrier tracking loop systems. The software with the algorithms of serial PN acquisition and full time early-late DLL, the system may achieve PN acquisition and demodulate data timely, and can be upgraded onto the chips flexibly. -
沈允春.扩谱技术.北京:国防工业出版社,2001,第一章.[2]张邦宁,张小宁.DS/SS抗干扰卫星通信系统中的自动频率控制技术.军事通信技术,1998,6:40-44.[3]Cahn C R, Leimer D K, Marsh C L, Huntowski F J, Larue G. Software implementation of a PN spread spectrum receiver to accommodate dynamics. IEEE Trans. on Communications, 1977,COM-25(8): 832-840.[4]Hinedi S, Statman J I. 高动态GPS跟踪.遥测遥控, 1991, 8:17-21 .[5]Natali F D. AFC tracking algorithms. IEEE Trans. on Communications, 1984, COM-32(8):935-947. -
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