Bistatic airborne radar clutter compensation method and device based on derivative updating

The invention discloses a bistatic airborne radar clutter compensation method and device based on derivative updating. The method includes receiving echo signals of bistatic airborne radar, and calculating sum of transceiving distances of a Kth to-be-detected distance door of the echo signals; calculating pitching angle cosine in a main lobe direction according to the sum of the transceiving distances of the Kth to-be-detected distance door; calculating self-adaptive weight vector of derivative updating according to receiving distance or the pitching angle in the main lobe direction; compensating the echo signals according to the self-adaptive weight vector. Processing based on derivative updating is realized under a bistatic condition; after the method is utilized to compensate echo data, distance dependence of the bistatic airborne radar can be lowered effectively, so that ground moving target detection performance of space-time self-adaptive processing is greatly improved, and working efficiency of radar detection is improved greatly.