Fig.1

Micro-motion model of single target"

Fig.2

Schematic diagram of occlusion judgment of scattering center"

Fig.3

Schematic diagram of auxiliary coordinate system {X2′, Y2′, Z2′}"

Fig.4

Micro-motion model of two targets"

Fig.5

Promotion of multi-target micro-motion modeling"

Fig.6

Flowchart of multi-target dynamic echo simulation process"

Table 1

Micro-motion parameters and relative position of the target"

Fig.7

Theoretical micro-Doppler and time-frequency analysis results of the first set of echo simulation"

Fig.8

Theoretical micro-Doppler and time-frequency analysis results of the second set of echo simulation"

Fig.9

Theoretical micro-Doppler and time-frequency analysis results of the third set of echo simulation"

Fig.10

Simulation result of time-HRRP sequence and theoretical micro-motion range"

Fig.11

Simulation result of ISAR imaging"

Fig.12

Schematic diagram of electromagnetic calculation for two micro-motion targets"

Fig.13

Time-frequency analysis result of electromagnetic calculation data"

Table 2

Correlation coefficient and image error between the narrowband echo simulation result and the electromagnetic calculation result"

Fig.14

Electromagnetic calculation result of time-HRRP sequence"

Fig.15

Electromagnetic calculation result of ISAR imaging"

Table 3

Simulation relative error of SSCE coordinates %"