Abstract:

Within a system of code division multiple access (CDMA), in an area there exist multiple base stations which transmit different signals in the same frequency bandwidth. And usually it is difficult to identify the energy intensity and direction of these multiple stations. Aiming at this problem, a method of target detection for CDMA based passive radar using array antenna is proposed. This method uses a concatenation cancellation method to remove the inference of each base station. Firstly the strongest base station at each step is identified through pilot search and the direction of the station is measured accurately, then the interference of the station in each channel is canceled. Repeat this in turn according to the energy intensity of each station till the interference is suppressed sufficiently. Finally beamform and rangDoppler correction are performed in order to detect the target. Computation simulation verifies the availability of this method.