Research on motion compensation of FMCW continuous mode slope radar

Slope radar which is based on the principles of synthetic aperture radar and differential interferometry can be used to the deformation monitoring in open pit mines, tailings, dump and other occasions. The existing slope radar systems mainly adopt stepping frequency continuous wave signal (SFCW) to achieve range resolution, and achieve azimuth resolution by stop-go motion mode along track direction. In this paper, frequency modulated continuous wave (FMCW) signal and continuous motion mode are applied in slope radar, which can reduce the acquisition time of each radar image from 5–10 minutes to 0.5–1 minutes. However, continuous motion mode will introduce errors in the echo model. This paper focuses on the imaging geometry model of continuous motion mode slope radar, and imaging algorithm with motion error compensation. In detail, the imaging geometry and echo model of continuous motion acquisition mode slope radar based on FMCW signal are established in Section 2. And Section 3 deduces the imaging algorithm with motion error compensation. In Section 4, numerical simulation on the relationship between velocity and imaging performance is carried out. And the motion error model and imaging algorithm of this paper are verified via mine slope measured data analysis in Section 5.