Abstract
Coherent processing of multiple-input multiple-output (MIMO) radar with widely separated antennas has high resolution capability, but it also brings ambiguity in target localization. In view of the ambiguity problem, different from other signal processing sub-directions such as array configuration optimization or continuity of phase in space/time, this paper analyzes it from the information level, that is, the tracking method is adopted. First, by using the state equation and measurement equation, the echo data of multiple coherent processing intervals (CPI) are collected to improve the target localization accuracy as much as possible. Second, the non-coherent joint probability data association filter (JPDAF) is used to achieve stable tracking of spatial cross targets without ambiguity measurements. Third, based on the tracking results of the non-coherent JPDAF, the ambiguity of coherent measurement is resolved, that is, the coherent JPDAF is realized. By means of non-coherent and coherent alternating JPDAF (NCCAF) algorithms, high accuracy localization of multiple targets is achieved. Finally, numerical simulations are carried out to validate the effectiveness of the proposed NCCAF algorithm.
Highlights
Academic Editors: Shiyang Tang, According to [1,2], the coherent processing of multiple-input multiple-output (MIMO)radar with widely separated antennas can locate targets with high resolution
Because of widely separated antennas of MIMO radar, much target position ambiguity will occur in high resolution mode, which brings difficulties to the realization of high resolution target localization
In order to make full use of all useful information about the MIMO radar, this paper proposes a two time filtering method
Summary
Academic Editors: Shiyang Tang, According to [1,2], the coherent processing of multiple-input multiple-output (MIMO). How to realize phase unwrapping is key to achieving high resolution target location in MIMO radar with widely separated antennas. The optimized array configuration still has half-wavelength array spacing In other words, it is not suitable for the phase unwrapping of widely distributed antennas. In the field of acoustic signal processing, because the signal carrier frequency is low and the relative speed of target and sensor is small, phase unwrapping can be realized through the continuity of phase in time [19,20]. MIMO radar with widely separated antennas do not have high precision imaging in the process of target location. The above work does not take advantage of widely distributed antennas, that is, the coherent processing is not carried out based on the non-coherent target location results.
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