Simultaneously Velocity Measuring and HRR Profiling with a Novel CSF Sequence

High radial velocity of radar targets is an important reason of HRRP (high range resolution profile) distortion in synthetic HRR pulse radar and it can be measured by transmitting high PRF sequences. Therefore, high PRF synthetic HRR sequence has the potential to acquire accurate radial velocity besides of accurate range and undistorted HRRP. In this paper, a new waveform called CSF (cross stepped frequency) sequence is proposed. The carrier frequencies of the first half pulses and the second half pulses in one CSF sequence are stepped with two opposite stepping slopes, making the CSF sequence achieve much higher range-Doppler 2D resolution than normal SF sequence. The principle of velocity estimation in high PRF mode is derived based on phase compensating and profile correlating process. After that, twice bandwidth of each half is synthesized by echo sequence re-ordering, which makes CSF sequence much more attractive than TSF (triangle stepped frequency) sequence. Simulation results show that much less velocity estimation error exists by utilizing CSF sequence than SF sequence in high PRF mode, and that HRRP after twice-bandwidth-synthesis has great correlation coefficient with ideal HRRP of twice bandwidth. Thus, high PRF CSF sequence has a good perspective in utilization