Abstract: ‍ ‍Airborne radar can effectively overcome the interference of adverse factors such as ground object occlusion and earth curvature when observing high-speed maneuvering targets， and has many advantages like wide detection range， high sensitivity and strong maneuvering ability. However， in the actual flight process， due to the influence of air flow and other external factors， airborne radar will inevitably be affected by the motion errors. At the same time， because of the high-speed and maneuvering of the target， cross-range migration and cross-Doppler migration will occur during the observation time， which leads to the failure of the traditional coherent integration method. To this end， this paper proposes a signal coherent integration method of airborne bistatic radar high-speed target based on Improved Generalized Radon Fourier Transform （IGRFT）. Through joint searching equivalent motion parameters and motion errors parameters， the range/Doppler migration of the target and the motion errors of the airborne platform can be compensated simultaneously， and then the signal energy of the target could be coherently integrated in order to improve the echo Signal-to-Noise Ratio （SNR）. Simulation results show that the proposed method can significantly enhance the integration and detection performance of the target in the presence of motion errors.