| 摘要 |
<p>A radar receiver 200 comprises an analogue receiver 230 for receiving a radar echo signal and a digital receiver 240. The analogue receiver converts the radar echo signal into an intermediate frequency (IF) analogue signal. The digital receiver 240 includes an analogue-to-digital converter (300A-D, Fig. 4) arranged to receive and sample the IF analogue signal from the analogue receiver 230. The sampling is undersampling according to the Nyquist criterion, so that a plurality of IF digital signals are produced, in different Nyquist zones, including one or more aliased IF digital signals. The digital receiver 240 is arranged to select an IF digital signal from the one or more aliased digital signals. The receiver may be a pulse-Doppler radar receiver, a monopulse radar receiver, and/or a radar receiver using phase-coded pulse compression.</p> |
