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全球导航卫星系统反射(GNSS-R)技术应用过程中接收机的测试验证需要反射信号产生源,以降低成本。信号的模型是GNSS-R信号产生源中的核心。针对缺乏相应模型的问题,提出了一种根据双基雷达原理建立GNSS海面反射信号模型的方法。首先,在分析GNSS海面反射信号特征的基础上,选取了恰当的海面反射点。然后,计算了雷达方程中的散射系数和散射面积,从而得到相应反射点的反射信号功率。最后,对所求得的反射信号参数进行仿真验证。验证的结果表明,反射信号的相关功率曲线与ZV模型理论曲线的相关系数优于0.98,能够有效地用于GNSS海面反射信号的生成。因此,该方法可为GNSS-R信号产生源的研制提供一定的理论支撑。
Test verification of receivers in the application of GNSS-R technology requires reflection signal generation sources to reduce costs. The signal model is at the heart of the GNSS-R signal generation source. Aiming at the problem of lack of corresponding models, a method of establishing GNSS sea surface reflection signal model based on bistatic radar principle is proposed. First, based on the analysis of the characteristics of the GNSS sea surface reflection signal, the appropriate sea surface reflection point is selected. Then, the scattering coefficient and scattering area in the radar equation are calculated, and the reflected signal power of the corresponding reflection point is obtained. Finally, the obtained reflection signal parameters are verified by simulation. The verification results show that the correlation coefficient between the correlation power curve of reflected signal and the theoretical curve of ZV model is better than 0.98, which can be effectively used in the generation of GNSS sea surface reflection signal. Therefore, this method can provide some theoretical support for the development of GNSS-R signal source.