Abstract: Conventional FFT-based signal processing technique in OTH radar can not detect maneuvering target effectively.Channel compensation method is improved,in which computational load and real-time realization are fully considered.The improved algorithm corrects compensation-caused frequency bias in the channel-Doppler spectrum,and then greatest-of principal is used to achieve channel synthesizing for one-channel detection.Finally,peak detection technique is introduced to lower the detection load and false alarm.Analysis and data processing show that the improved algorithm has low complexity,low false alarm and robustness.