| 摘要 |
Adaptive arrays have been implemented for GPS as simple analogue, power minimisation cancellers which cancel any interference which is present but do not optimise the reception of the satellite signals. Described herein is a method and apparatus (1) for optimising the reception of the wanted satellite signals using digital techniques whilst still cancelling the interference using beamsteering techniques. The apparatus (1) comprises an adaptive array (10) for receiving satellite signals and providing an output signal (20) for a GPS receiver (30). The receiver (30) processes the received signals and provides an output signal (40) indicative of the carrier to noise estimate for a particular direction. A beam direction controller unit (50) uses the output signal (40) to select a direction signal (60) which selects an array gain vector (80) from look-up table (70). The array gain vector (80) is fed to a weight computation unit (90) for providing a weight vector (100) for the adaptive array (10) in accordance with the selected direction to cancel interference. |
