The Study Of Millimeter Wave Compressed Sensing Imaging Technology Based On Frequency Selective Surface

Compressed Sensing theory is a hot research frontier between mathematics and information processing field,it far below the Nyquist sampling rate for signal acquisition,and from a small amount of non-correlation measurements of high efficiency to reconstruct the original signal so that in the wireless sensor network,data reconstruction,image processing,radar imaging,particularly in imaging applications more widely.Compressed sensing measurement matrix is the key theory into practical,accurate and get it a few measurements of the original signal reconstruction plays a vital role,but because of the high cost and complexity of hardware implementation,severely restricted the compression aware application.Millimeter wave has good penetration properties and strong anti-interference ability to make millimeter wave imaging technology in anti-terrorism,detection,security and other fields have an unparalleled advantage.Therefore,how to use the characteristics of compressed sensing sampling theory,developed a hardware implementation,low complexity and cost,higher efficiency of the reconstruction millimeter wave imaging system has a very important practical significance.Based on the full study compressive sensing theory and millimeter wave imaging technology based on compressed sensing around a millimeter wave imaging system constructed to highlight the following aspects are depth:1.Study the millimeter wave radiation characteristics and has a band-pass/band-stop characteristic frequency selective surface theory and simulation design by introducing performance PIN diode switch designed adjustable loop type FSS structural units,we studied the structure of the bias circuit FSS influences.The simulation results show that the frequency of 37.5GHz millimeter-wave radiation,the use of PIN diode control such FSS structural unit on/off state,which corresponds to exhibit band-pass/band-stop rejection characteristics to achieve a unit of the millimeter wave transmission characteristics control.2.For measurement matrix in the millimeter wave imaging system compression a key role in perception,simulation-based design of 10×10 FSS mask structure can be randomly controlled,and this random mask is placed on the millimeter-wave antenna that can be covered by this caliber the diaphragm obtain multiple unrelated measure,construct an effective measurement matrix.Through software simulation of the caliber of different structures were 200 valid measurement,construct a 200×256 measurement matrix,analyze the performance measurement matrix.3.In the study of millimeter-wave compression-based sensing imaging principle on the use of reconstruction algorithm of size 16×16 reconstructed to restore the original image,the imaging system to verify the feasibility of the proposed article.Simulation results show that this imaging method is easy hardware implementation,low complexity and cost,and has good image reconstruction effects at lower sampling rate situation.