Fig. 1. Schematic diagram of iteration and correction algorithm process

Fig. 2. Schematic diagram of experimental framework

Fig. 3. Triangular wave and pre-distorted voltage given by presach model and corresponding time-frequency curves of beat frequency signal

Fig. 4. Pre-distorted voltage given by algorithm iteration and corresponding time-frequency curves of beat frequency signal

Fig. 5. Experimental results of linear frequency sweep obtained by iterative pre-processing with ECDL

Fig. 6. Distance measurement experiments at different distances