基于信噪比划分重力导航适配区等级的实用化方法OA

The rationality and accuracy of adaptation zone division directly determine the applicability and even the success of gravity-aided navigation technology.Addressing the current lack of consensus on domestic criteria and execution standards for such division,this study proposes a practical stepwise and hierarchical adaptation zone classification scheme.The study begins by categorizing and analyzing widely used gravity field characteristic parameters,elucidating the scientific essence of gravity navigation adaptation zones and examining their applicability,and evaluating the guaranteed accuracy of the new version of the marine gravity background field model.To align with China's current technological capabilities and practical needs,a single-parameter SNR threshold method is proposed to classify adaptation zones into three grades(low,medium,and high)compatible with real-time filtering algorithms and correlation matching algorithms.Furthermore,gravity increments between adjacent survey points are adopted instead of point-based gravity values in the computations of filtering and correlation matching algorithms,thereby mitigating systematic biases introduced during the data modeling process.The theoretical conclusions are validated through numerical simulations using the recently released international satellite altimetry-derived gravity model SWOT-03.The study provides a distribution map of adaptation zones classified into low,medium,and high grades for the test area.