首页>
外国专利>
Method and apparatus for a low complexity satellite ranging system using Gaussian noise overlay
Method and apparatus for a low complexity satellite ranging system using Gaussian noise overlay
展开▼
机译:使用高斯噪声覆盖的低复杂度卫星测距系统的方法和装置
展开▼
页面导航
摘要
著录项
相似文献
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.
展开▼