| タイトル | P-Code-Enhanced Encryption-Mode Processing of GPS Signals |
| 本文（外部サイト） | http://hdl.handle.net/2060/20110023742 |
| 著者（英） | Young, Lawrence; Meehan, Thomas; Thomas, Jess B. |
| 著者所属（英） | California Inst. of Tech. |
| 発行日 | 2003-03-01 |
| 言語 | eng |
| 内容記述 | A method of processing signals in a Global Positioning System (GPS) receiver has been invented to enable the receiver to recover some of the information that is otherwise lost when GPS signals are encrypted at the transmitters. The need for this method arises because, at the option of the military, precision GPS code (P-code) is sometimes encrypted by a secret binary code, denoted the A code. Authorized users can recover the full signal with knowledge of the A-code. However, even in the absence of knowledge of the A-code, one can track the encrypted signal by use of an estimate of the A-code. The present invention is a method of making and using such an estimate. In comparison with prior such methods, this method makes it possible to recover more of the lost information and obtain greater accuracy. |
| NASA分類 | Technology Utilization and Surface Transportation |
| レポートNO | NPO-30367 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/268242 |
