We present a one-bit quantified phase-based algorithm combined with the noiseless correlation transformation (PANCT) to estimate the three-dimensional (3D) parameters (i.e., azimuth angle, elevation angle, and range) of wideband near-field source via uniform circular array. We first propose a noiseless correlation transformation scheme without direction of arrival pre-estimation to obtain the correlation matrix of focusing frequency bin. Then, we exploit the phase differences to construct indefinite matrix and implement the least-square method to derive 3D parameters. Considering that the complexity scenarios include phase ambiguity and one-bit quantization, we further propose the corresponding unambiguous PANCT algorithm and one-bit quantified PANCT algorithm, respectively. Simulation results demonstrate that the proposed algorithms provide satisfactory estimation performance with low computational complexity.
In irregular pulse repetition interval (PRI) radar, successive pulses each with different PRIs are used as the transmission waveform. After analyzing the signal model of irregular PRI radar, we propose a coherent integration method based on Radon-iterative adaptive approach (Radon-IAA) to deal with the problems of irregular range cell migration (RCM) and the irregular phase fluctuations among different pulses introduced by the irregular PRI. In our method, the irregular RCM is compensated by searching through the motion parameters, and the irregular phase fluctuations can be resolved by an IAA-based spectral analysis method. The effectiveness of the proposed method is verified by simulation experiments.
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