| タイトル | Search and rescue satellite (SARSAT) error analysis of the 406 MHz system |
| 著者（英） | Eisner, A.; Yionoulis, S. M.; Maurer, H. A. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1984-01-01 |
| 言語 | eng |
| 内容記述 | A computer simulation investigated conditions encountered by the SARSAT 406 MHz system. Three and four parameter emergency transmitter (ET) location solutions were determined. Latitude and longitude, a frequency bias, and in the four-parameters solutions, a linear frequency drift term were estimated. Earth gravity, frequency drift, and measurement noise are the major error contributors to the ET position. Time-tag ET height and velocity errors, although significant are not routinely present. In the four-parameter solutions the drift error is eliminated; however, the sensitivity to measurement noise increases. Using the four-parameter pass solutions, the 406 MHz oscillator specifications can be relaxed and still satisfy the 5 km positioning requirement. Since a linear oscillator drift is removed in the four-parameter solution, only the measurement noise over 10-15 min is important. |
| NASA分類 | SPACECRAFT DESIGN, TESTING AND PERFORMANCE |
| レポートNO | 85N31118 |
| 権利 | No Copyright |
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