| 摘要 |
A geolocation system ( 10 ) includes an emitter ( 12 ), a plurality of collection nodes ( 14,16,18 ), and a control station ( 20 ). Each collection node includes a receiver ( 24 ) that is operable to receive signals transmitted from the emitter ( 12 ), generate a reduced data stream that includes only signal data, and communicate the reduced data stream to the control station ( 20 ) along with navigation data. The receiver ( 24 ) identifies signal data by detecting an energy level of the raw collection data. More specifically, the receiver ( 24 ) determines a bandwidth and a signal-to-noise ratio of each portion of the collection data, and identifies each portion as including signal data if both the bandwidth and the signal-to-noise ratio exceed predetermined threshold amounts. The receiver ( 24 ) includes a digital signal processing component ( 36 ) for performing calculations used by the receiver ( 24 ) to determine the bandwidth and the signal-to-noise ratio.
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