高動態(tài)條件下PN碼擴(kuò)譜接收機(jī)的頻率跟蹤策略
Frequency Tracking Algorithms for PN Spread Spectrum Receiver in High Dynamic Circumstance
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摘要: 在UHF,SHF頻段上,機(jī)載或彈載PN碼擴(kuò)譜接收機(jī)由于接收機(jī)載體的高動態(tài)特性,導(dǎo)致接收信號具有顯著的多普勒頻移的不確定性。該文根據(jù)這一實(shí)際特點(diǎn),對幾種載波環(huán)捕獲與跟蹤數(shù)字系統(tǒng)進(jìn)行了研究。在軟件上,結(jié)合碼環(huán)的串行滑動相關(guān)捕獲算法與全時間超前-滯后非相干跟蹤算法,既達(dá)到了載波頻率的快速同步,保證了對數(shù)據(jù)的實(shí)時解擴(kuò)與解調(diào),同時使系統(tǒng)具有很好的靈活性,方便了二次開發(fā)和升級。
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關(guān)鍵詞:
- 擴(kuò)譜接收機(jī); 多普勒頻移; 自動頻率控制
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.擴(kuò)譜技術(shù).北京:國防工業(yè)出版社,2001,第一章.[2]張邦寧,張小寧.DS/SS抗干擾衛(wèi)星通信系統(tǒng)中的自動頻率控制技術(shù).軍事通信技術(shù),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. 高動態(tài)GPS跟蹤.遙測遙控, 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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