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The use of compressive sampling in subsurface holographic radiolocation


M.A. Chizh – Post-graduate Student, Research Assistant, Bauman Moscow State Technical University. E-mail:

In the last decade, the sparse or compressed sensing theory has been developed which allows reconstructing images of objects from a reduced number of measurements in comparison with traditional methods. The main objective of compressive sensing is to reconstruct a signal on the base of a grid with spatial or time sampling greater than required by the Nyquist theorem. The experimental setup developed in the Remote sensing laboratory at BMSTU was used for experimental studies of the sampling in-fluence on the resolution of the test object reconstructed image. This setup consists of a vector network analyzer, an antenna, a tripod, flexible feeders to connect the antenna, and a mechanical two-coordinate scanner and allows specifying the spacing between samples, testing different scanning parameters with the help of the PC-side software. Data acquisition is performed automatically by moving objects near the antenna line by line. A complex data processing algorithm was developed for improving the resolution and background-object contrast enhancement. To evaluate the effectiveness of the developed processing algorithm, two procedures of obtaining radar images were considered: one in-cluding the processing stages and another without them. For imaging in both the procedures the conventional back-propagation method for radar images processing was applied. For the three specified values of sampling interval, at the frequency of 22.5 GHz complex holograms were obtained by scanning the sample with the mentioned experimental setup, then the processing of the signal frequency spectrum was performed. The obtained results show that the above processing procedure significantly improves image quality, increases the contrast of the object against the background, effectively suppresses reconstruction algorithm artifacts. It should also be noted that despite the considerable un-dersampling the form of the object can be clearly distinguished. A further step to adaptiveness and flexibility in the development of the proposed sparse sensing technique will be the rejection of rigid geometry scanning when data acquisition is performed on an equidistant grid. Further implementation of the compressive sensing concept will enable an adaptive data acquisition with more image detail in the areas of interest and minimum amount of noninformative data.


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