| 摘要 |
<p>A system and method are disclosed by which the effects of time of arrival (TOA) errors may be reduced. In a mobile unit, a correlation pulse is generated when a signal transmitted from a base station is detected. The transmitted signal may be reflected or defracted such that multipath signals arrive at the mobile unit. This leads to a distortion in the generated correlation pulse and errors in accurate (TOA) measurements. The present invention models the response function and calculates the width of the pulse using the modeling function with a dynamically adjustable factor to indicate at what point down from the peak the pulse width will be calculated. Based on the calculation of pulse width, a type of multipath signal may be determined and an appropriate correction factor applied to the measured (TOA) to provide a more accurate (TOA) determination. The system may apply correction factors to (TOA) signals from base stations in a mobile telephone unit or from signals received from global positioning system (GPS) satellites.</p> |
