A New 2-D Parameters Estimation Algorithm of Wideband LFM Near-Field Sources

A new algorithm based on the coherent signal-subspace method (CSM) is developed to estimate the angle and range parameters of the wideband near-field linear frequency modulated (LFM) sources. The algorithm decomposed the wideband LFM signals into several narrowband LFM signals, and focused the every narrowband signals to the same reference frequency by the coherent subspace algorithms, and then constructed the MUSIC spectrum function, utilized the peak search method for estimating the bearing and range of wideband LFM near field sources. The algorithm's characteristic is that the noise subspace of the received signal can directly be estimated by the propagator method, and the spectral function can be constructed without the singular value decomposition. So the calculation of the Incoherent Signal-subspace algorithm can be effectively reduced, meanwhile the estimation performance can be kept higher. The computer simulation shows the effectiveness of the developed algorithm.