Angular resolution limits for coincidence imaging radar based on correlation theory

Coincidence imaging radar (CIR) can achieve super-resolution in real aperture staring radar imagery by employing temporal-spatial independent array detecting (TSIAD) signals. The characteristics of TSIAD signals are determined by the random signal waveform and the array geometry, and the imaging performance is influenced by the relative imaging position with respect to the antenna array. In this paper, the uniform spacing linear array (USLA) with the frequency random modulation (FRM) signal waveform is studied. The angular resolution limit (ARL) for the CIR system is derived based on correlation theory. The effects of the parameters on the resolution performance are investigated. Comparison of ARL between the proposed CIR system and the real aperture radar (RAR) system is presented to validate the efficiency of the CIR system.