A GPS sonobuoy localization system

PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556) Pub Date : 2004-04-26 DOI:10.1109/PLANS.2004.1309024

H. Whitehouse, J. Alsup, A. M. Leese de Escobar, S. Sullivan

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引用次数: 13

Abstract

A GPS localization system is described that uses the precision navigation signal but does not require a SAASM decoding unit in the sonobuoy. The system operates by retransmitting a selected 1 MHz portion of the GPS L1 or L2 signal spectrum from the sonobuoy to a Master Control Station (MCS). By offsetting the selected spectrum about 2 MHz from the center frequency of the GPS band, both the current P(Y) signal and the new M-code signal can be accommodated. By cross-correlating the retransmitted signal with the same signal received at a remote site a differential delay can be computed for each visible satellite. This delay defines a prolate spheroid with one focus at the satellite and the other at the remote site. The intersection of the measured prolate spheroid with the oblate spheroid approximation of the sea surface defines a closed curve on the surface of the ocean on which the sonobuoy lies. Two additional satellite measurements or two additional measurements of the same satellite from a moving remote site such as an airplane then locates the sonobuoy uniquely.

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GPS声纳浮标定位系统

描述了一种GPS定位系统，该系统使用精确导航信号，但不需要声纳浮标中的SAASM解码单元。该系统通过从声纳浮标向主控站(MCS)重新传输选定的GPS L1或L2信号频谱的1mhz部分来运行。通过将选定的频谱与GPS频段的中心频率偏移约2mhz，可以同时容纳当前的P(Y)信号和新的m码信号。通过将重传信号与远程站点接收到的相同信号相互关联，可以计算出每个可见卫星的差分延迟。这个延迟定义了一个长球面，一个焦点在卫星上，另一个焦点在远程站点上。测得的长球面与海面的扁球面近似值的交点在声纳浮标所在的海面上定义了一条闭合曲线。两个额外的卫星测量或来自移动的远程站点(如飞机)的同一颗卫星的两个额外测量，然后唯一地定位声纳浮标。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556)

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