Ionospheric frequency modulation causes spreading of the surfaceclutter in Doppler domain which greatly limits the detection performance of HF sky-wave radars.
电离层频率调制导致地表面杂波的多谱勒展宽，极大地限制了高频天波雷达的目标探测性能。
2
Theoretical analysis and experimental results prove that the fractal model matches the clutter from a natural rough surface and models it effectively.
理论分析和实验表明，天然粗糙面杂波和分形模型相吻合，分形模型可有效地对天然粗糙面杂波进行建模。
3
Through selecting appropriate curve length of the reflection surface, it can reduce the reflection clutter of the near ground and improve the detection ability of low altitude.