In order to reduce the Doppler spread effect caused by ionospheric disturbance, sky wave over-the-horizon radar often detects ships in a short coherent integration time (CIT). In short CIT, an effective means to detect ships is clutter suppression. Through the analysis of the real data, it is found that the sea clutter has a strong correlation when the sea state is relatively stable, whether in long CIT or short CIT. To avoid estimating clutter subspace dimension and clutter cancellation times of the available methods, an adaptive clutter suppression method based on sea clutter correlation is proposed. This method does not need to estimate the parameters of the clutter, even when the Doppler frequency of the ship target is close to the sea clutter, the target can be detected. Theoretical analysis and real data processing indicate that the proposed method can detect ship target effectively.

为了减少电离层扰动引起的多普勒扩散效应，天波超视距雷达通常会在很短的相干积分时间（CIT）中检测到船只。简而言之，CIT是一种检测船舶的有效方法，即抑制杂波。通过对实际数据的分析，发现无论是长CIT还是短CIT，当海况相对稳定时，海杂波具有很强的相关性。为了避免估计可用杂波子空间维数和杂波消除时间，提出了一种基于海杂波相关性的自适应杂波抑制方法。该方法不需要估计杂波的参数，即使当船舶目标的多普勒频率接近海杂波时，也可以检测到目标。