无线电工程
無線電工程
무선전공정
RADIO ENGINEERING OF CHINA
2014年
2期
21-23,49
,共4页
码跟踪环路%BOC%测距精度%延时相干%VNELP
碼跟蹤環路%BOC%測距精度%延時相榦%VNELP
마근종배로%BOC%측거정도%연시상간%VNELP
code tracking loop%BOC%ranging accuracy%delay coherent%VNELP
由于高阶二进制偏移载波调制（ Binary Offset Carrier， BOC）信号存在自相关函数多峰值特性，在低信噪比（ Signal-to-noise Ratio， SNR）环境下，其解扩后的相关峰分布易受噪声影响造成峰值错乱，严重影响基带码跟踪环路性能和伪距测量精度。介绍了经典BOC信号非相干过超前滞后（Non-correlation Very Early Late Processing， VNELP）码跟踪环路，并对其在低信噪比条件下的跟踪性能进行评估，提出了基于VNELP环路的延时相干支路法对原有码跟踪环路在低信噪比条件下对高阶BOC信号的处理性能进行改进。计算机仿真验证了所提方法的有效性和对原VNELP环路的性能改进效果。
由于高階二進製偏移載波調製（ Binary Offset Carrier， BOC）信號存在自相關函數多峰值特性，在低信譟比（ Signal-to-noise Ratio， SNR）環境下，其解擴後的相關峰分佈易受譟聲影響造成峰值錯亂，嚴重影響基帶碼跟蹤環路性能和偽距測量精度。介紹瞭經典BOC信號非相榦過超前滯後（Non-correlation Very Early Late Processing， VNELP）碼跟蹤環路，併對其在低信譟比條件下的跟蹤性能進行評估，提齣瞭基于VNELP環路的延時相榦支路法對原有碼跟蹤環路在低信譟比條件下對高階BOC信號的處理性能進行改進。計算機倣真驗證瞭所提方法的有效性和對原VNELP環路的性能改進效果。
유우고계이진제편이재파조제（ Binary Offset Carrier， BOC）신호존재자상관함수다봉치특성，재저신조비（ Signal-to-noise Ratio， SNR）배경하，기해확후적상관봉분포역수조성영향조성봉치착란，엄중영향기대마근종배로성능화위거측량정도。개소료경전BOC신호비상간과초전체후（Non-correlation Very Early Late Processing， VNELP）마근종배로，병대기재저신조비조건하적근종성능진행평고，제출료기우VNELP배로적연시상간지로법대원유마근종배로재저신조비조건하대고계BOC신호적처이성능진행개진。계산궤방진험증료소제방법적유효성화대원VNELP배로적성능개진효과。
As the multi-peaks features exist in the high order Binary Offset Carrier ( BOC ) modulation signals' self-correlation functions,the span of correlation peaks after de-spreading is often affected by the noise with a low Signal-to-noise Ratio (SNR),it makes a strong impact on the performance of the code tracking loop and the accuracy of the pseudo-range. This paper introduces the classic tracking loop called Non-correlation Very Early Late Processing (VNELP) for the BOC modulation signals,evaluates the track-ing performance of loop in low level SNR,and puts forward a delay accuracy branch method based on VNELP code tracking loop to make the loop processing performance for high order BOC modulation signals get better with a low SNR.The computer simulation results show that this method is feasible and can effectively improve the performance of VNELP loop.
