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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Geodetic Network Design for InSAR
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Geodetic Network Design for InSAR

机译：InSAR大地测量网络设计

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Ground deformation can be monitored with subcentimetric precision from space, using interferometric synthetic aperture radar (InSAR). This technique can sometimes be limited by a low density of naturally occurring phase-coherent radar targets. Measurement densification may be achieved through improvements in processing algorithms and new satellites with better revisit times, but there can still exist areas where very few coherent targets are detected, e.g., in vegetated nonurbanized areas. For third-party end users of InSAR survey results, there is currently no systematic method to determine whether these coherent targets have adequate spatial distribution to estimate the parameters of their interest. We propose such a method, along with a practical solution for measurement densification, i.e., deployment of coherent target devices such as corner reflectors or transponders. We propose a generic network design methodology that does the following: 1) determines whether the naturally occurring InSAR measurements are adequate; 2) finds the minimum number of additional devices (if required); and 3) finds their optimal ground locations. The method digests, as inputs, the expected locations and quality of existing coherent targets, the quality of the devices being deployed, and, if available, any prior knowledge of the deformation signal. At the core of the method is a comparison of different covariance matrices of the final parameters of interest with a criterion matrix (i.e., the desired idealized covariance matrix), using a predefined metric. The resulting network is optimized with respect to precision, reliability, and cost criteria. Simulated data sets and a subsidence case study in the Netherlands are used to demonstrate this method.
机译：使用干涉式合成孔径雷达（InSAR），可以从太空以低于厘米的精度监视地面变形。这种技术有时会受到自然发生的相干雷达目标密度低的限制。可以通过改进处理算法和重新访问时间更短的新卫星来实现测量的致密化，但是仍然存在某些区域，例如在无植被的无植被区域中，检测到的连贯目标很少。对于InSAR调查结果的第三方最终用户，当前尚没有系统的方法来确定这些相干目标是否具有足够的空间分布来估算其感兴趣的参数。我们提出了这样一种方法，以及用于测量致密化的实用解决方案，即部署相干目标设备（例如转角反射器或应答器）。我们提出一种通用的网络设计方法，该方法可以执行以下操作：1）确定自然发生的InSAR测量是否足够； 2）查找最小数量的附加设备（如果需要）； 3）找到他们的最佳地面位置。该方法将现有连贯目标的预期位置和质量，所部署设备的质量以及变形信号的任何先验知识（如果有）作为摘要进行提取。该方法的核心是使用预定义的度量将目标最终参数的不同协方差矩阵与标准矩阵（即所需的理想化协方差矩阵）进行比较。最终的网络在精度，可靠性和成本标准方面进行了优化。模拟数据集和荷兰的沉陷案例研究都证明了这种方法。

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