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本文针对近距离宽带LFMCW-SAR成像的应用背景,提出了一种基于YIG振荡器的X波段5.1 GHz带宽线性调频连续波信号源方案,该方案结构简单、价格低廉,缺点是线性度较低,导致距离分辨率下降.传统非线性估计方法在低信干噪比或多目标混叠情况下,估计精度将严重下降甚至失败.针对这个问题,本文提出一种基于宽窄带滤波器相结合的二次迭代高阶模糊函数非线性误差估计与插值重采非线性矫正方法,该方法在低信干噪比情况下仍能有效估计并矫正发射信号的非线性.论文分别采用仿真数据、延迟线数据以及轨道SAR实测数据对算法进行了验证.
In this paper, based on the application background of wideband LFMCW-SAR imaging, an X-band 5.1 GHz bandwidth chirp signal source scheme based on YIG oscillator is proposed. The proposed scheme has the advantages of simple structure, low cost, low linearity, Resulting in a decrease in the resolution of the distance.When the traditional nonlinear estimation method is under the condition of low SINR or multi-objective aliasing, the estimation accuracy will seriously decline or even fail.In order to solve this problem, this paper proposes a novel two- Order iterative high-order fuzzy function nonlinear error estimation and interpolation recanalization nonlinear correction method, the method can still effectively estimate and correct the nonlinearity of the transmitted signal under the condition of low signal to interference plus noise ratio.The paper uses the simulation data, the delay line data As well as the measured data of orbital SAR.