Abstract:

Ubiquitous radar is a new radar system that provides
continuous and uninterrupted multifunction capability within a coverage
volume. Continuous coverage from close-in “pop-up” targets
in clutter to long-range targets impacts selection of waveform parameters.
The coherent processing interval (CPI) must be long
enough to achieve a certain signal-to-noise ratio (SNR) that ensures
the efficiency of detection. The condition of detection in the
case of low SNR is analyzed, and three different cases that would
occur during integration are discussed and a method to determine
the CPI is presented. The simulation results show that targets
detection with SNR as low as −26 dB in the experimental system
can possibly determine the CPI.

Key words: ubiquitous radar, low signal-to-noise ratio (SNR),
coherent processing interval (CPI), coherent integration, noncoherent
integration.