An effective method for estimation of DOAs of mutiple LFM signals with sub-nyquist spatial sampling

Aim. We propose a new approach to estimating DOAs(direction of arrivals) of multiple LFM signals with sub-Nyquist spatial sampling. Sections 1 through 3 explain our method of estimation mentioned in the title, which we believe is effective. In section 1,we analyze the process of estimating DOAs of multiple LFM signals with sub-Nyquist spatial sampling and obtain the condition for ignoring the effect of cross term. In section 2, we brief GRCRT(Generalized Robust Chinese Remainder Theorem) for multiple numbers proposed by us in Ref.4. In section 3, we obtain ambiguous phase differences of multiple LFM signals from several pairs of array antennas with sub-Nyquist spatial sampling; then we apply GRCRT to estimating the real DOA of each LFM signal. Section 4 presents a numerical example; the simulation results, given in Figs. 2, and their analysis show preliminarily that our new approach based on GRCRT for multiple numbers can indeed accurately and robustly estimate DOAs of multiple LFM signals. © 2015, Northwestern Polytechnical University. All right reserved.