In this study, we present an iterative method for finding target position using only range measurements from multi-static passive radar system. We formulate an optimization problem and use the gradient descent approach to locate target position. In addition, we show that for multi-receiver-single-transmitter system, our method requires only three receivers in order to converge to the correct position without having local minima problem. Furthermore, we conduct Monte-Carlo simulation to evaluate the mean time and accuracy of our approach. Our method can be implemented in real-time and hence it can be applied in real-life situations.
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