发明名称 |
Method and apparatus for a low complexity satellite ranging system using Gaussian noise overlay |
摘要 |
A ranging system for a communications spacecraft (14) overlays a Gaussian noise signal over a broadband channel which also carries information or traffic signals. The noise is used to establish the range between a ground station (12) and the spacecraft (14). The range is determined by delaying the Gaussian noise in a controllable delay (32), and autocorrelating the delayed noise with the noise returned over the communications channel from the spacecraft. The ranging system (FIG. 4) reduces the bandwidth of the noise in a filter (18) during initial acquisition, to color the noise and broaden the autocorrelation peak (FIG. 3a). The broad peak shortens the initial search time. Once the peak is initially found, the noise bandwidth is progressively broadened to narrow the autocorrelation peak (FIG. 3c) and to give a more accurate indication of range.
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申请公布号 |
US5680143(A) |
申请公布日期 |
1997.10.21 |
申请号 |
US19960655111 |
申请日期 |
1996.05.29 |
申请人 |
LOCKHEED MARTIN CORPORATION |
发明人 |
HERSHEY, JOHN ERIK;HLADIK, STEPHEN MICHAEL;SAULNIER, GARY JUDE;LANGAN, DAVID ALLEN |
分类号 |
G01S7/00;G01S13/82;H01Q3/22;(IPC1-7):H01Q3/22 |
主分类号 |
G01S7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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