分布式地波雷达系统射频干扰抑制的研究

摘要

分布式地波雷达系统利用多个地波雷达站对固定海域进行探测,可以实现多视角、多频率的海态监测.由于射频干扰具有距离相关、频谱展宽的特点,同一干扰极易覆盖在来自不同发射站附近的海洋回波上,严重影响数据质量.传统的干扰抑制算法是对所有距离元采取相同的处理,对干扰的抑制有局限性,容易造成海洋回波所在的距离元信号衰减,无海洋回波的距离元干扰抑制不彻底的问题,对后续的海态反演造成困难.针对上述情况,基于奇异值分解理论提出一种距离元自适应方法,对含有海洋回波的距离元采用方位子空间分解算法,其余距离元采用频率子空间分解算法,利用实测和模拟数据证明了该方法的有效性.%Distributed ground wave radar system,which uses multiple ground wave radar stations to detect the fixed ocean area,can monitor sea state with multiple perspectives and multiple frequencies.Radio frequency interference(RFI) has the characteristics of range-domain correlation and Doppler-domain spectral broadening,which may submerge the sea echoes from different radar stations and affect the data quality seriously.Traditional methods which are applied in all range bins have some limitations for distributed HF surface wave radar system.That is,they can cause signal attenuation in the sea echo range bin and RFI remain in the other range bins,which leads to difficulties in sea state inversion.In this paper,a range-bin adaptive method is proposed to suppress RFI in HF SWR system.According to the classification of radar range parameters,singular value decomposition (SVD) algorithm is used to process signal respectively in frequency domain and space domain.By analyzing the measured and simulated data,we can conclude that the method can suppress RFI effectively and improve the quality of radar data.