Adaptive techniques and other recent developments in aeromagnetic compensation
Adaptive techniques and other recent developments in aeromagnetic compensation
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DOI：
10.3997/1365-2397.2017018
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发表时间：
2017-09
期刊：
影响因子：
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通讯作者：
G. Noriega;Andre Marszalkowski
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文献类型：
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作者：
G. Noriega;Andre Marszalkowski
航磁补偿是大多数航空地球物理勘探方案的组成部分，在过去几十年里受到了相当大的关注。先进的补偿系统植根于原始模型，该模型考虑了来自永久性、感应性和涡流源的飞机干扰，在建模、算法、传感器、性能分析、实现问题和新兴应用领域的研究推动了显著的进步。本文重点介绍了两个重要的最新发展。自适应补偿通过使用递归算法来解决潜在的最小二乘问题，从而提供了一种根本不同的方法。该系统不断地从输入中学习，动态地调整解决方案系数，以便对每一组新的测量进行最佳补偿。分析了影响其性能的因素，结果表明，在简单的配平操纵段上定期使用自适应补偿，比传统的高空全校准飞行要求要低得多，可以将解的拟合优度保持在最优水平附近。其次，讨论了星载电子系统的实时动态补偿问题。来自航空电子、液压和其他仪表的电流会产生常规补偿模型所不能考虑的干扰。OBE补偿技术提供了对此类信号源的强大容忍度，简化了操作和数据处理要求。
Aeromagnetic compensation, an integral part of most airborne geophysical exploration programmes, has received considerable attention throughout the last few decades. Advanced compensation systems, rooted in the original model which accounts for aircraft interference from permanent, induced, and eddy-current sources, have led to significant advances fueled by research in the areas of modelling, algorithms, sensors, performance analysis, implementation issues, and emerging applications. This paper focuses on two important recent developments. Adaptive compensation allows a fundamentally different approach by using a recursive algorithm to solve the underlying least-squares problem. The system continuously ‘learns’ from inputs, dynamically adapting solution coefficients for optimum compensation with each new set of measurements. Factors affecting its performance are analysed, and it is shown that regular use of adaptive compensation along simple trim-manoeuvre segments, much less demanding than conventional full-calibration flights at high altitude, can maintain the goodness of fit of a solution near optimal levels. Secondly, real-time dynamic compensation of on-board electronic (OBE) systems is discussed. Electric currents from avionics, hydraulics, and other instrumentation, generate interference which is not accounted for by the conventional compensation model. OBE compensation technology provides robust tolerance of such sources, simplifying both operational and data processing requirements.