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Post-Doppler methods are rank reduction techniques to reduce temporal dimensions by applying the Doppler filter and can reduce the processing time than full degrees-of-freedom (DOF) space-time adaptive processing (STAP). In post-Doppler methods, multi-bin post-Doppler methods are generally used to improve the performance of signal-to-interference-plus-noise ratio (SINR). However, it is necessary to solve the issue of different adaptation for each Doppler bin by using the covariance matrices which formed by multiple filter banks. Therefore, it is very effective to calculate each optimum weight in parallel. For further improvements of processing time, we propose an efficient approach to calculate not one but multiple Doppler bins. When a uniform filter weight is applied to the proposed method, the performance of SINR deteriorate in the vicinity of bank edges. Therefore, we improved the performance by overlapping in the filter bank of both ends. In addition, we show its system design and benchmark results by using self-developed digital signal processor (DSP) boards.