Extended time processing for passive bistatic radar

The authors present a novel optimisation of calculation of the range-velocity surface for passive bistatic radar (PBR). Unlike other optimisations, the time-bandwidth product is maintained by ensuring that maximum integration gain is achieved. The advocated technique also permits extended observation intervals without increased processing. Continuous signals of opportunity are interrupted in the receiver; this enables high coherence over extended data acquisition times facilitating high Doppler/velocity resolution. The effect of this technique on integration gain and robustness to target decorrelation is investigated using a simulation. A validating experiment is reported in which a prototype PBR obtains a velocity resolution of 0.07 ms^-1 when measuring a human target.