Fig. 1. Schematic of the heterodyne detection system

Fig. 2. Schematic of the I&Q detector

Fig. 3. Processing flow chart of the matched filtering algorithm

Fig. 4. Waveform distortion induced by the matched filtering process. (a) Envelope of the OPM signal; (b) envelope of self-convolution of the OPM signal

Fig. 5. Matched filtering process of medium-range missile. (a) REC signal; (b) power spectrum density of REC signal; (c) OPM signal and REC signal; (d) matched filtered output signal with carrier frequency; (e) envelope of the matched filtered output signal; (f) power spectrum density of the matched filtered output signal

Fig. 6. Matched filtering process of ISS. (a) REC signal; (b) power spectrum density of REC signal; (c) OPM signal and REC signal; (d) matched filtered output signal with carrier frequency; (e) envelope of the matched filtered output signal; (f) power spectrum density of the matched filtered output signal

Fig. 7. Monte Carlo simulation. (a) Range error of medium-range missile; (b) range rate error of medium-range missile; (c) range error of ISS; (d) range rate error of ISS

Fig. 8. CNR versus target range

Fig. 9. CNR versus radar cross section of target

Fig. 10. Power spectral density of echo signal with different sampling rates. (a) 100 MHz; (b) 400 MHz; (c) 700 MHz; (d) 1 GHz; (e) 10 GHz; (f) 20 GHz

Fig. 11. Envelope of the matched-filtered signal with different sampling rates. (a) 100 MHz; (b) 400 MHz; (c) 700 MHz; (d) 1 GHz; (e) 10 GHz; (f) 20 GHz