단일 펄스 LFM 파형에서 표적 속도 추정 방법

Abstract

Linear frequency modulation(LFM) waveforms in pulsed radars are extensively used owing to their excellent Doppler tolerance and low side-lobe level characteristics after pulse compressions. On the contrary, it is difficult to determine target Doppler velocity from single-pulse LFM waveforms because of their excellent Doppler tolerance. If it is possible to detect the range and velocity of targets with only single-pulse transmission and reception, multi-function radars can gain advantages in terms of resource management. In this paper, we propose a method of estimating target velocity using single-pulse LFM waveforms. The proposed method uses range-Doppler coupling and signal to noise ratio loss effects due to Doppler frequency inconsistency between the matched filter and signal during pulse compressions. The proposed method can estimate the target velocity from a few computations through two additional matched filtering processes after the target range detection, and its function and performance are verified via simulations.