电讯技术
電訊技術
전신기술
TELECOMMUNICATIONS ENGINEERING
2014年
10期
1360-1365
,共6页
刘勇%张国毅%胡鑫磊%王晓峰
劉勇%張國毅%鬍鑫磊%王曉峰
류용%장국의%호흠뢰%왕효봉
线性调频-伪码信号%参数估计%分数阶傅里叶变换%解线调
線性調頻-偽碼信號%參數估計%分數階傅裏葉變換%解線調
선성조빈-위마신호%삼수고계%분수계부리협변환%해선조
LFM-PRBC signal%parameter estimation%fractional Fourier transform%dechirp
为了解决目前算法中线性调频-伪码( LFM- PRBC)信号参数估计计算量较大的问题,提出了一种快速估计算法。该算法采用解线调与分数阶傅里叶变换( FRFT)进行参数的估计。首先对信号进行解线调估计出调频斜率的粗略值,然后由调频斜率确定旋转角,通过FRFT估计出码元宽度的粗略值。根据延时再进行解线调估计出调频斜率的精确值,再通过FRFT估计出码元宽度的精确值与起始频率。该算法不仅计算量较低,同时具有很高的估计精度与很强的抗噪性,仿真实验验证了该算法的有效性。
為瞭解決目前算法中線性調頻-偽碼( LFM- PRBC)信號參數估計計算量較大的問題,提齣瞭一種快速估計算法。該算法採用解線調與分數階傅裏葉變換( FRFT)進行參數的估計。首先對信號進行解線調估計齣調頻斜率的粗略值,然後由調頻斜率確定鏇轉角,通過FRFT估計齣碼元寬度的粗略值。根據延時再進行解線調估計齣調頻斜率的精確值,再通過FRFT估計齣碼元寬度的精確值與起始頻率。該算法不僅計算量較低,同時具有很高的估計精度與很彊的抗譟性,倣真實驗驗證瞭該算法的有效性。
위료해결목전산법중선성조빈-위마( LFM- PRBC)신호삼수고계계산량교대적문제,제출료일충쾌속고계산법。해산법채용해선조여분수계부리협변환( FRFT)진행삼수적고계。수선대신호진행해선조고계출조빈사솔적조략치,연후유조빈사솔학정선전각,통과FRFT고계출마원관도적조략치。근거연시재진행해선조고계출조빈사솔적정학치,재통과FRFT고계출마원관도적정학치여기시빈솔。해산법불부계산량교저,동시구유흔고적고계정도여흔강적항조성,방진실험험증료해산법적유효성。
To solve the problem that the parameter estimation of linear frequency modulation-pseudo ran-dom binary codes( LFM-PRBC) signal requires a large amount of computation in current algorithms,a fast parameter estimation algorithm which uses dechirp and fractional Fourier transform( FRFT) is proposed. Firstly,the dechirp is used to obtain the rough estimation of chirp rate which can determine the angle of ro-tation, and the rough estimation of symbol width is achieved by FRFT. And then,the exact value of chirp rate is estimated from the second dechirp based on the delay of the signal. Finally,through the second FR-FT the exact value of symbol width and the initial frequency are obtained. The proposed algorithm has not only low computation complexity but also high estimation accuracy and strong ability of immunity to noise. The effectiveness of this algorithm is verified by simulation.