摘要
基于差分GPS水下定位系统的双曲线定位模型,推导了极坐标系下定位结果的解析表达式,并进一步给出了水面基线网的网形、基线精度以及水声距离测量精度对定位结果影响的分析。结果表明,采用非辐射网形分布,双曲线定位模型存在明显的不稳定区;采用辐射网形基线分布,在基线网的范围内,平面定位精度较均匀;无论采用何种基线网形分布,深度方向的弱约束必然导致深度方向存在显著的误差。
A new analytic method for analyzing the stability of hyperbolic intersecting algorithm is given, which is a base principle of underwater GPS positioning system. The formula to resolve underwater target＇s coordinates are derived under polar coordinates system. Based on the formula, a set of analytic equations are deduced. Numerical tests show that the meth- od is feasible and effective. The results reveal that there exists distinct area in which the hyperbolic intersection algorithm becomes instable when all buoys distribute on an un-radiate network. Because of weak constrains in depth direction, the accuracy of depth resolution is usually got tremendously bad.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2008年第8期824-827,共4页
Geomatics and Information Science of Wuhan University
基金
国家863计划资助项目(2005AA613050)
