I. Introduction
Compared with ground-based radar, airborne bistatic radar can expand the detection distance and overcome the influence of low-altitude blind zone, which is widely used in space target detection, long-range early warning and reconnaissance, and other fields [1]. However, the high-speed and stealth targets bring great challenges to target detection of airborne bistatic radar [2]. Long time coherent integration (CI) is an effective method to improve the echo signal-to-noise ratio (SNR) and radar detection ability [3]. The traditional CI method only considers the high-speed maneuvering characteristics of targets, and then corrects and compensates the range migration (RM) and Doppler frequency migration (DFM) [4]. Unfortunately, the airborne platform will inevitably generate motion errors in the process of flight, resulting in the failure of the traditional CI methods.