| 摘要 |
<p>A method and apparatus for automatically detecting a coherent frequency burst is disclosed. The apparatus (10) determines the approximate frequency and duration of the burst. The apparatus (10) operates utilizing principles of autocorrelation to reject random noise and maximize the efficiency of a down stream data signal processor. The apparatus (10) includes delay means (30) which accepts a digitized signal from a device, such as a photodetector in an LDV, and generates a plurality of delayed signals. The delayed signals are then multiplied by the original signals by multiplier means (40). The multiplied signals are provided to averaging circuits (50). The averaged signals are then compared to a reference level by comparators (60), the output of which is provided to priority encoder (70). Priority encoder (70) prioritizes the signals received from comparators (60) and determines the length of the burst.</p> |
