High-resolution radar

A processing system for high-resolution stretch-compression radar, in which a ramp signal of steadily varying frequency is transmitted and a similar, corresponding de-ramp signal mixed with the radar return signal received, the de-ramped signal is then down converted by at least one IF stage; the system comprising means for receiving demodulated digital radar return signals following the de-ramping and down conversion to video frequency of signals received by the radar; means for storing data representative of corrections for unwanted artefacts in the ramp and de-ramp signals and in the transmit-receive path due to hardware in the radar system including the antenna and microwave transmission parts; and a processor arranged to correct the demodulated input radar return signals by first applying the stored corrections for de-ramp signal artefacts, then removing residual video phase between the different frequency components in the composite radar return signal corresponding to different target ranges, and then applying the stored corrections for the transmitted ramp signal and transmit-receive path artefacts.