The Research Of Two-dimensional Synthetic Aperture Algorithm Based On Time-delay Correlation

The synthetic aperture microwave radiometer uses the sparse small antenna to form the minimal redundant interference baseline for imaging,and has the advantages of instantaneous imaging without scanning and higher resolution under the same size,so it has been widely used in the fields of satellite remote sensing to the earth,passive detection,terminal guidance of missile-borne platform and so on.But in areas such as security and detection,radiometer systems have to increase the number of antennas to achieve baseline redundancy for greater sensitivity.According to the basic principle,the calculation amount of correlation function is proportional to the square of the number of antennas,which limits the array size of the system.In order to solve the above problems and reduce the complexity of signal processing,the concept of two-dimensional comprehensive aperture microwave radiation inversion based on delay correlation has been proposed in this paper.The correlation operation number of this algorithm is only related to the number of array baseline pairs and is not affected by array redundancy.The basic principle of the algorithm is introduced,the process of the inversion in digital domain and the simulation test results are given.Specifically,based on the principle of one-dimensional time-delay correlation comprehensive aperture imaging,this paper realizes the bright temperature inversion algorithm of two-dimensional time-delay correlation system,and presents the basic delay interval condition that satisfies the time-delay correlation of twodimensional system.This paper presents a method obtains the visibility function by performing the autocorrelation operation according to the arrangement order.Finally,simulation tests of bright temperature inversion image in different twodimensional array have been carried out in this article based on the measured data.The test results show that the two-dimensional synthetic aperture algorithm based on delay related has the feasibility of light temperature inversion image,compared with the conventional synthetic aperture system,the new algorithm can effectively reduce the degree of signal processing.