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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >An Array Error Estimation Method for Constellation SAR Systems
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An Array Error Estimation Method for Constellation SAR Systems

机译：星座SAR系统的阵列误差估计方法

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摘要

In practice, unavoidable array errors, consisting of phase and position errors, significantly degrade the performance of constellation synthetic aperture radar (SAR) systems. Therefore, methods are required to estimate these errors. In constellation SAR systems, the clutter spectrum components within a Doppler bin can be used as calibration sources with known directions. In this letter, it is observed that the steering vectors of the spectrum components in one Doppler bin are conjugate with those of the spectrum components in its contrary Doppler bin on condition that each SAR operates in side-looking mode and its nominal left coordinate is zero, which is easy to realize. We obtain a new phase error estimation method based on this observation. An array error estimation method, which estimates phase and position errors simultaneously, is proposed via combining the new phase error estimation method with the least squares method for estimating position errors. The advantages of the proposed method include its capability to directly estimate phase and position errors without joint iteration between the estimations of phase and position errors; thus, it performs well, while the conventional method behaves unstably because it may converge to a local optimal solution, when position errors are large. Furthermore, mathematical analysis indicates that the proposed method has less computational load. In addition, computer simulations show that it performs better than the conventional method. The only cost is that it employs twice as many Doppler bins as the conventional method does, which is endurable because there are numerous Doppler bins.
机译：实际上，由相位和位置误差组成的不可避免的阵列误差会严重降低星座合成孔径雷达（SAR）系统的性能。因此，需要方法来估计这些误差。在星座SAR系统中，多普勒频段内的杂波频谱分量可用作已知方向的校准源。在这封信中，可以观察到，在每个SAR工作于侧视模式且其标称左坐标为零的条件下，一个多普勒仓中频谱分量的导引向量与其相反的多普勒仓中频谱分量的导引向量是共轭的。 ，这很容易实现。基于这种观察，我们获得了一种新的相位误差估计方法。通过将新的相位误差估计方法与最小二乘法相结合来估计位置误差，提出了一种同时估计相位和位置误差的阵列误差估计方法。该方法的优点在于它能够直接估计相位和位置误差，而无需在相位和位置误差的估计之间进行联合迭代。因此，它的性能很好，而常规方法的行为不稳定，因为当位置误差很大时，它可能会收敛到局部最优解。此外，数学分析表明该方法计算量较小。另外，计算机仿真表明它的性能比传统方法更好。唯一的成本是它使用的Doppler bin数量是传统方法的两倍，这是持久的，因为有很多Doppler bin。

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