| 摘要 |
Described herein is a method and apparatus for improving high range resolution of a radar system. The method comprises phase shifting a radar pulse to be transmitted at substantially the radar transmission frequency and phase shifting the received radar pulse at substantially the radar transmission frequency. The phase shifting is implemented using a monolithic microwave integrated circuit (MMIC) ( 42 ) driven by a digital circuit ( 44 ) to provide a phase profile which is applied to radar pulse ( 52 ) produced by a radar pulse generator ( 54 ) and which is also applied to a received radar pulse ( 60 ). A master clock and synchronizer ( 72 ) provides clock signals for an analogue to digital converter (ADC) ( 68 ), the generator ( 54 ) and the digital circuit ( 44 ) so that the MMIC ( 42 ) is clocked at a frequency which is directly harmonically related to the ADC ( 68 ). This avoids spurious beat frequencies which could interfere with a wanted radar signal.
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