一种电离层慢相径扰动提取与补偿改进算法

Improved arithmetic for extracting and compensating the phase-path variations caused by ionospheric disturbance

针对采用调频连续波(FMCW)体制的天波超视距雷达的应用场合,提出了一种电离层扰动(慢相径变化)补偿改进算法。该算法利用雷达回波谱中海浪在空间上的独立性来获取统计样本,因而在无需对雷达系统作任何改动的情况下,可获得对电离层扰动瞬时频率变化的统计估计。通过相位补偿有效地抑制了电离层扰动造成的多普勒谱展宽和频率漂移。给出了应用该方法的具体步骤,通过仿真实验证明该算法的有效性。

This paper presents an improved arithmetic for extracting and compensating the phase-path variations caused by the ionospheric disturbance in a HF sky-wave OTH radar with FMCW waveform. It takes statistical samples used for estimation of transient frequency modulation making the Doppler spectrum widening from different range bins, which are independent of distance each other. Doing it is no special requirement for the radar system. With transient frequency modulation estimation, the widened Doppler spectrum may not only be narrowed but also the Doppler shift compensated. Then, it gives the chart diagram of arithmetic and procedures of signal processing. Finally, an example of data simulation demonstrates the effectiveness of this approach.