Effective velocity estimation method for passive location based on virtual aperture

As an important part of electronic reconnaissance, radiation source location technology has always attracted much attention. With the deployment of low-Earth orbit satellites and the development of 5G communication, the realization of 5G radiation source location has important military and commercial significance. In recent years, researchers have introduced synthetic aperture technology into passive location to improve the location accuracy. The algorithm uses the Doppler information of the received signal to locate the radiation source. To solve the influence of satellite orbit curvature and earth curvature on the location model under the spaceborne condition, the effective velocity is introduced. In this paper, an effective velocity estimation algorithm based on matched filtering is proposed. The received signal is filtered by the matched filter constructed by solving the positions of the emitter corresponding to different velocities. Different from the existing effective velocity estimation methods, this algorithm is less dependent on the geometric model, so the approximate estimation process is less and the estimation error is smaller. The simulation results show that the proposed algorithm can effectively improve the positioning accuracy and has better location performance than the traditional single-satellite location method.