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本文提出一种应用投影法复值估计［１］在低中频直接采样中处理带通信号的方法。这种方法可以利用较少的采样数据，得到高精度的复值估计，从而实现对带通信号的相干检测。这种算法的计算量小，因而可以构成实时系统。计算机模拟的结果证明了这种高精度的信号处理方法是完全可行的。
In this paper, we propose a method to process band-pass signals in low-IF direct sampling by using projection-based complex-valued estimation [1]. This method can use less sample data to obtain high-precision complex-valued estimation, in order to achieve coherent detection of the band-pass signal. The computational load of this algorithm is small, so it can form a real-time system. Computer simulation results show that this high-precision signal processing method is entirely feasible.