天波雷达海杂波功率谱建模与仿真

Modeling and Simulation of Sea Clutter Power Spectra for Sky-Wave Over the Horizon Radar

海杂波功率谱建模,是定量研究天波雷达海杂波频域特性从而为评估天波雷达对海探测性能提供理论依据的前提和难点。传统的基于产生机理的Barrick海杂波模型没有考虑天波传播环境影响,且只能获得海杂波后向散射系数值,无法获得天波雷达海杂波功率谱值和准确的变化规律。为解决上述问题,引入电离层展宽、电离层吸收损耗和洋流影响计算模型,建立了要素完整的天波雷达海杂波功率谱数学模型。根据上述模型,利用matlab软件仿真分析了不同条件下海杂波功率谱的变化特性。仿真结果表明,所建模型可获得与定性分析一致的结论,能够较好地近似实测数据,证明了模型的有效性。

Modeling of Sea Clutter Power Spectra（SCPS） is premise and difficulty of quantificational study on sea clutter frequency domain characteristic to Sky-wave Over the Horizon Radar（ SWOTHR）, which can provide evalua- tion of detection capability on sea target for SWOTHR with theoretical evidence. Due to neglect the influence of sky wave propagation environment and only to get the values of back-scattering coefficient, traditional Barrick＇ s sea clut- ter model based on production principle cannot get the values of SCPS and exact changing rules. In order to solve the problem, this paper introduces calculation models of ionosphere spread, ionosphere absorption loss and ocean current influence and establishes the complete mathematic model about sky-wave radar＇ SCPS. Simulation and analysis on changing rules of sky-wave radar＇ SCPS under different condition are presented using Matlab software. The results show that the established model can get the same conclusion with qualitative analysis and be close to measured data, which proves the availability for the model.