  Orthogonal time frequency space (OTFS) modulation was proposed to tackle the
destructive Doppler effects in wireless communications, with potential
applications to many other areas. In this paper, we investigate its application
to radar systems, and propose a novel efficient OTFS-based matched filter
algorithm for target range and velocity estimation. The proposed algorithm not
only exhibits the inherent advantages due to multi-carrier modulation of the
existing orthogonal frequency division multiplexing (OFDM-) based radar
algorithms but also provides additional benefits to improve radar capability.
Similar to OFDM, OTFS spreads the transmitted signal in the entire
time--frequency resources to exploit the full diversity gains for radar
processing. However, OTFS requires less cyclic prefix, and hence, shorter
transmission duration than OFDM, allowing longer range radar and/or faster
target tracking rate. Additionally, unlike OFDM, OTFS is inter-carrier
interference-free, enabling larger Doppler frequency estimation. We demonstrate
the performance of the proposed algorithm using numerical results under
different system settings.
