CAJ | 학술논문

基于Pei采样型DFRFT算法,提出了一种线性调频脉冲压缩新方法.该方法通过补零延拓从而将线性调频脉冲的时延估计问题转化为中心频率估计问题,再利用分数阶傅里叶变换对线性调频信号的能量聚集性实现与传统线性调频脉冲压缩性能相近的效果.在此基础上,导出了其离散距离估计式的解析表达,并分析了其离散精度以及多普勒频移的影响.该方法具有较强的抗多普勒频移能力,并在保证测距精度条件下大大降低了运算量.仿真结果证明了理论推导的正确性.
기우Pei채양형DFRFT산법,제출료일충선성조빈맥충압축신방법.해방법통과보령연탁종이장선성조빈맥충적시연고계문제전화위중심빈솔고계문제,재이용분수계부리협변환대선성조빈신호적능량취집성실현여전통선성조빈맥충압축성능상근적효과.재차기출상,도출료기리산거리고계식적해석표체,병분석료기리산정도이급다보륵빈이적영향.해방법구유교강적항다보륵빈이능력,병재보증측거정도조건하대대강저료운산량.방진결과증명료이론추도적정학성.
@@@@Based on Pei sampling-type DFRFT algorithm, a novel method of linear frequency-modulated pulse compression is proposed. Through zero padding and prolongation, the time delay estimation of linear frequency-modulated (LFM) pulse is transformed into the center frequency estimation. In this way, the result approximate to the conventional LFM pulse compression can be obtained by utilizing the LFM pulse energy concentration of fractional Fourier transform. The analytic expression of discrete range-finding estimator is derived and the corresponding dispersion accuracy and the influence of Doppler shift are analyzed. It is found that the proposed method has strong robustness on Doppler shift, and reduces the computation complexity by half without the decline of range-finding accuracy. The simulations prove the above-mentioned theories.