In distributed radar systems, when several transmitters radiate
simultaneously, the reflected signals need to be distinguished at the receivers
to detect various targets. If the transmit signals are in different frequency
bands, they require a large overall bandwidth. Instead, a set of
pseudo-orthogonal waveforms derived from the Zadoff-Chu (ZC) sequences could be
accommodated in the same band, enabling the efficient use of available
bandwidth for better range resolution. In such a design, special care must be
given to the 'near-far' problem, where a reflection could possibly become
difficult to detect due to the presence of stronger reflections. In this work,
a scheme to detect multiple targets in such distributed radar systems is
proposed. It performs successive cancellations (SC) starting from the strong,
detectable reflections in the domain of the Discrete Chirp-Fourier Transform
(DCFT) after compensating for Doppler shifts, enabling the subsequent
detections of weaker targets which are not trivially detectable. Numerical
simulations corroborate the efficacy and usefulness of the proposed method in
detecting weak target reflections