RESEARCH ON A NEW WAVWFORM DESIGN METHOD TO IMPROVE VELOCITY RANGE

Millimetre wave radar can realize non-contact measurement, with long detection distance, high accuracy and strong anti-interference ability. It has achieved good results in the measurement of distance and velocity, and is widely used in the field of radar measurement. However, the maximum unambiguous velocity of the classic chirp continuous waveform limits the measurement range, which is usually solved by using multiple chirp signals with different FM slopes. But in this case, a longer measurement time is required, which contradicts the high update rate. Therefore, this paper designs a new waveform, adds frequency hopping between sequences, and proposes an unambiguous velocity detection method within a single measurement period. The simulation results show that the new waveform does not need to add an additional frequency modulation sequence, which effectively expands the radar velocity range within a single measurement period, while ensuring a sufficiently large accumulation gain.