Adaptive velocity ambiguity resolution algorithm based on gradient descent

For Pulse radars, the Doppler spectrum of the targets will fold in the range of radar frequency measurement and the velocity ambiguity occurs, when the Doppler frequency of the target is larger than a single pulse repetition frequency (PRF). Many classical methods of solving velocity ambiguity depend on the distance-change rate. The poor or unknown accuracy of distance may result in unreliable ambiguity resolution. In this paper, an objective function of resolving the velocity ambiguity for staggered PRI radar is proposed. The gradient descent with a self-adaptive updating learning rate is introduced to calculate the ambiguity. The proposed method can find out the true velocity of the target with a small number of iterations, which is not affected by the distance accuracy.