New radar waveform based on a chirp sequence

For all radar applications it is required to measure the target range R and radial velocity vr simultaneously and unambiguously with high accuracy and resolution even in multi target situations. In this paper, a new radar waveform is proposed, which is based on a chirp sequence. In the considered case, each chirp signal has a very short duration Tchirp. Therefore, the measured beat frequency fB is dominated by the target range R and is less influenced by the radial velocity vr. However, the classical chirp sequence waveform suffers from possible ambiguities in the velocity measurement. It is, therefore, the objective of this paper to modify the classical chirp sequence based on an additional frequency modulation from chirp to chirp to get an unambiguous velocity measurement even in multi target situations.