Distributed Coherent Aperture Radar Baseline Measurement Based on Cooperative Unmanned Aerial Vehicles

In order to enable the distributed coherent aperture radar (DCAR) to enter the cooperative mode of interferometry, it is necessary to calibrate each unit in the space, time and frequency domains, etc. The existing spatial baseline calibration method still has shortcomings in convenience, accuracy and flexibility. Aiming at the problem that the spatial baseline calibration mode of distributed coherent radar using signal phase-frequency information is not accurate enough to satisfy the system entering the fully coherent working mode, based on the cooperative unmanned aerial vehicles (UAV) as the external radiation source, the hovering position of the UAV is independently planned to solve the problem of low accuracy and poor stability of baseline calibration by processing signals from multi-view observation. The simulation and data processing show that this method can further reduce the error of baseline solution and realize the coherent mode of distributed radar in airspace.