Fig. 1. Output waveform of LFM matched filtering

Fig. 2. Transmitting signal and receiving signal. (a) Transmitting signal of LFM pulse; (b) receiving signal at distance of 4 m; (c) receiving signal at distance of 6 m

Fig. 3. Output waveform of matched filter at different distances under sampling frequency of 10 MHz. (a) 4 m; (b) 6 m

Fig. 4. Output waveform of matched filter at different distances under sampling frequency of 50 MHz. (a) 4 m; (b) 6 m

Fig. 5. Design principle of orthogonal matched filter. (a) LFM matched filter; (b) orthogonal demodulation matched filter

Fig. 6. Flow chart of synchronous detection based on secondary decision

Fig. 7. Simulated waveform of demodulation output. (a) Output waveform of I/Q matched filtering; (b) secondary decision synchronous detection

Fig. 8. Output amplitude of matched filter under different clock frequency deviation

Fig. 9. Design structure of orthogonal matched filter. (a) Design structure of matched filter; (b) modules of orthogonal demodulation and test verification

Fig. 10. Schematic of experimental apparatus

Fig. 11. Output waveform of I/Q matched filter at different distances. (a) 4 m; (b) 6 m

Fig. 12. Actual test results at different distances. (a) 4 m; (c) 6 m