| 摘要 |
Radar apparatus for processing a received signal having a carrier frequency f0 includes means for directing the received signal in parallel into first and second channels. A first filter in the first channel bandpass filters the received signal and is centered at a frequency f1 equal to f0+ DELTA 1f. The first filter provides an output signal having a central frequency f0+ DELTA 1f/2. A second filter coupled in the second channel bandpass filters the received signal and is centered at f2=f0+ DELTA 2f. The second filter thus provides an output signal having a central frequency f0+ DELTA 2f/2. A first mixer in the first channel mixes the first filter output with a signal f1=f0+ DELTA 1f/2 to extract the carrier frequency of the first channel. Likewise, a second mixer in the second channel mixes the second filter output signal with a signal f2=f0+ DELTA 2f/2 to also extract the carrier frequency in the second channel. The ouputs of both mixers are then passed to a processing and exploitation device to manipulate the signals to arrive at the appropriate range and/or velocity information. |
