| 摘要 |
<p>A method and system for tracking the position of at least one moving object, such as an airborne meteorological instrument (20) from a ground processing station by intercepting wideband spread spectrum signals transmitted from a plurality of satellites in which the code sequence of the signals is not known, comprises a receiver circuit in the moving object which compresses the wideband signals received into a narrow band, removes any frequency bias with a reference oscillator (12) having a frequency offset value, forms a narrow analog baseband (9) and transmits (14) to the processing station at which spectral lines are produced and compared with synthetic spectrum values to determine the identity of each satellite, the reference oscillator frequency offset value is estimated, and the location and velocity of the moving object is determined.</p> |
