A New Coherent Integration Method for Frequency Jittering Radar

Coherent processing for randomized stepped‐frequency radar in multi‐target scenario

“…Therefore, the RSF system is easy to implement, and the pulses are difficult to be tracked and predicted. Due to its excellent electronic countercountermeasures [6 and 7] performance, the RSF waveform has received increasing attentions [8][9][10][11][12][13][14][15][16][17][18]. In order to attain adequate process gain, coherent processing for RSF echoes is needed.…”

“…Therefore, synthesising the focussed HRRP requires RSF radar to accurately estimate the target's velocity. Fortunately, as the frequencies of the pulses are randomly chosen, the RSF radar decouples the range-Doppler (R-D) parameters and possess an ideal thumbtack ambiguity function [8][9][10], which enables it to use different frequency pulses for high-resolution velocity estimation as well as range estimation (in contrast, the possession of a ridge ambiguity function means that R-D parameters are coupled in the LSF waveform [18], which makes it lack the ability of joint R-D estimation by using different frequency pulses). However, in a multi-target scenario (there could be several targets in the same coarse-range bin), velocities estimation and HRRPs generation will be more difficult due to the mutual interference between these targets.…”

“…2) The second is called joint R-D estimation, which estimates the velocity and range parameters of each target simultaneously. The possession of an ideal thumbtack ambiguity function implies that joint R-D estimation can be achieved by the RSF waveform, but the traditional two-dimensional (2D) coherent processing suffers from the sidelobe pedestal problem [8,9], that is, small targets could be masked in the sidelobe pedestal of dominant targets. Therefore, iterative alternating projection and 2D-CS algorithms have been used to accomplish joint R-D estimation for the RSF radar in [9,15], respectively.…”

“…In a single‐target scenario, the high‐range‐resolution profile (HRRP) of a moving target can be obtained by the RSF radar as long as the Doppler phase is compensated accurately. Otherwise, defocusing problem [2, 8] may cause serious degradation to the synthetic HRRP. Therefore, synthesising the focussed HRRP requires RSF radar to accurately estimate the target's velocity.…”

Moving target coherent integration method for non‐coherent short pulse radar

“…Staggered PRF is a method to eliminate the BSSL effect, which has been widely studied and discussed [22, 23]. Yang discussed the theory of pulse accumulation by the RFT method for staggered PRF radar and deduced the Cramer‐Rao Lower Bound (CRLB) performance of distance and velocity estimation [24].…”