A new method for joint estimation of delay and Doppler from ambiguity function: combination of stochastic process and spatial processing for noise and clutter suppression

摘要

In this article, a new method is introduced for joint delay and Doppler estimation in ambiguity function (AF)-based radars. In this method, first each cell of AF is considered as a random variable and then a stochastic process is estimated for each cell based on its values during consecutive radar scans. In the second step, the AF is divided to high probability target and high probability clutter zones using parameters of the estimated stochastic processes. Finally, exact values of delay and Doppler of radar targets are extracted and localised from the divided AF by employing spatial processing techniques. Performance of the proposed method is evaluated in two different scenarios, corresponding to high and low speed targets, respectively. The obtained results show the greater ability of the suggested method in detection of the above types of targets compared to the present approaches. Furthermore, it can be shown mat the proposed method causes more considerable improvement in the detection of low speed targets than high speed targets compared to available methods.