Fig. 1. Frequency time relationship of symmetrical triangle FMCW modulation and performance of echo beat signal

Fig. 2. Comparison of multi-pulse coherent accumulation R_SN with different amplitude fluctuations

Fig. 3. Comparison of multi-pulse coherent accumulation R_SN error factor with amplitude fluctuation

Fig. 4. Comparison of multi-pulse coherent accumulation R_SN with the same mean and different amplitude fluctuations

Fig. 5. Comparison of multi-pulse coherent accumulation R_SN error factor with amplitude fluctuation

Fig. 6. Comparison of multi-pulse coherent accumulation R_SN with different amplitude fluctuation under different moving velocity

Fig. 7. Comparison of multi-pulse coherent accumulation R_SN error factor with amplitude fluctuation under different moving velocities

Fig. 8. Chart of experiment scheme

Fig. 9. Data processing flowchart

Fig. 10. Amplitude and phase of stationary target. (a) Amplitude fluctuation of stationary target; (b) original phase of the stationary target; (c) phase before phase compensation; (d) phase residual after phase compensation

Fig. 11. Multi-pulse frequency-domain coherent cumulative signal-to-noise ratio. (a) Incoherent cumulative signal-to-noise ratio, coherent cumulative actual signal-to-noise ratio and corresponding ideal signal-to-noise ratio gain index comparison; (b) signal-to-noise ratio error factor

Fig. 12. Position setting of moving target and moving platform to be measured

Fig. 13. Amplitude and phase of moving target. (a) Amplitude fluctuation; (b) phase of frequency point of moving target; (c) phase before the phase compensation; (d) phase compensation residual

Fig. 14. Multi-pulse frequency-domain coherent cumulative signal-to-noise ratio. (a) Incoherent cumulative signal-to-noise ratio, coherent cumulative actual signal-to-noise ratio and ideal signal-to-noise ratio gain index comparison; (b) signal-to-noise ratio error factor