利用最新GOCE重力场模型确定南极绕极流
Research on Single Epoch Orientation Algorithm of BeiDou Navigation Satellite System
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摘要: 利用最新的纯GOCE重力场模型GO_CONS_GCF_2_TIM_R4及由多源多代卫星测高数据确定的精细平均海平面高模型WHU2009,基于地转平衡方程确定了南极绕极流,其流幅的变化趋势与由海洋实测数据获取的SAF和PF锋面保持一致。将其分别与GRACE、多源数据同化模型CNES-CLS09和NOAA海洋实测数据结果进行了比较分析,结果表明,确定南极绕极流在狌、狏方向与海洋实测结果差异分别为10.1cm/s和5.3cm/s;在大尺度上,结果与同化模型和实测数据结果具有较好的一致性,明显优于GRACE结果,并且在大陆沿岸附近海域略优于多源数据同化模型CNES-CLS09;此外,利用本结果还可有效探测威德尔旋回和罗斯旋回等中尺度涡。Abstract: This paper first proposes a method for the BeiDou orientation using single epoch single frequency ambiguity resolution with fixed baseline length and single epoch dual frequency ambiguity resolution based on LAMBDA algorithm.According to the results of multiple tests on BeiDou and GPS short baseline data,the BeiDou’s ambiguity resolution success rate and the precision of orientation are found to be in common with the GPS’s.
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