Abstract
The restoration of 3D images of targets in the interferometric inverse synthetic aperture radars (InISAR) has been the subject of research for nearly two decades. Antennas arranged in height and horizontally are used for phase (interferometric) measurements and for adjusting the cross-range of scatterers separated by using ISAR with the broadband probing signal. In the case of an electronic beam scanning, it is possible the of observation. This leads to additional errors. A computational model is proposed that reproduces the geometric conditions of the target observation for two L-shape configurations of three receiving antennas in the InISAR. The model allows calculating the error of the method of measurement for the whole range of possible squint angles in the vertical and horizontal planes. The calculated dependences of the error of the method of measurement of the scatterers coordinates in the restored three-dimensional InISAR images of the targets under conditions of the squint observation model are obtained. The capabilities of the model are illustrated by calculations for specific observation conditions using the example of measuring the scatterer height, provided that the target is observed in the far-field region. The refined formula for the calculation of the height and other spatial coordinates of the scatterer, which takes into account the squint model of observation, is proposed. Results with similar order of errors also occur for measuring other spatial coordinates of the scatterer. The performance of the ratio for the calculation of altitude was also tested by simulation for the 5-point scatterer target model. Theoretical dependences were also obtained for the standard deviation (SD) estimation of the results of measurements of scatterer's coordinates at different squint angles in the vertical and horizontal planes at a fixed signal-to-noise ratio. The calculated dependencies for the SD of the results of measuring the height of the scatterer for two variants of the L-shape configurations of the receiving antennas are obtained. Recommendations are given on the possibility of combining these configurations to improve the accuracy of the measurement results.
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