积分二次相位函数和傅里叶变换的多相码参数估计

摘要

Aim at solve the problem that parameter estimation of poly-phase coded signals has great computation amount for traditional time frequency transformation,a new method is proposed. Firstly,the frequency rate is estimated through using integrated quadratic phase function(IQPF). Then, a new LFM signal is reconstructed and the frequency rate of poly-phase coded signal is eliminated through dechirp algorithm. Finally,ridge interval and carrier frequency is estimated so as to estimate code width and repeated period. This method doesn’t require conversion rectangular coordinate into polar coordinate and only needs one-dimensional search. So this method can drastically reduce the computation amount. Simulation indicates that its precision of parameter estimation equals to that of RWT’s and RAT’s,consuming less computational amount.%针对传统时频方法对多相码信号参数估计计算量比较大的问题，提出一种新的多相码参数估计方法。首先利用积分二次相位函数（IQPF）估计信号的调频率，然后重新构造一个线性调频信号（LFM），通过解线调将多相码信号的调频率消除，最后计算解线调后信号的傅里叶变换（FFT）估计信号脊线间隔和载频，进而估计信号的码元宽度和重复周期。该方法不需要进行直角坐标和极坐标的变换且仅需一维搜索，可以大幅度减小计算量。仿真表明，可以用较小的计算量取得与RAT（Radon-Wigner Transformation）和RWT（Radon-Ambiguity Transformation）相当的估计精度。