Method for reconstructing three-dimensional surface of planar holographic array target on basis of frequency interference

Abstract

The invention belongs to the field of radar signal processing, and particularly relates to a method for reconstructing a three-dimensional surface of a planar holographic array target on the basis of frequency interference. The method comprises the following specific steps: (S1) successively reconstructing data of frequency points in broadband echo into two-dimensional images by the same reference distances; (S2) selecting the two-dimensional images at the positions of a plurality of frequency points k1, k2, ..., and kN, and carrying out interference treatment on the two-dimensional images at the various frequency points to obtain initial interference results; and (S3) carrying out phase unwrapping and deep reconstruction on the initial interference results corresponding to the various frequency points k1, k2, ..., and kN in the step (S2) to obtain a reconstruction result of the three-dimensional surface of the target. By the method, the data of the different frequency points are interfered. Compared with a traditional imaging method, the method has the advantages that calculated amount is small, interpolation operation is not required, the ranging accuracy is quite high in the range direction, and therefore, the problem of large difference between resolution in the transverse direction and resolution in the range direction of the traditional three-dimensional image is solved. By the method, high-resolution imaging can still be realized under the condition that the data are lost in a certain degree.

Description

Technical field [0001] The invention belongs to the field of radar signal processing, and particularly relates to a method for reconstructing a three-dimensional surface of a planar holographic array target based on frequency interference. Background technique [0002] Active planar holographic array refers to a plane-shaped detection device with multiple transmitting and receiving elements that can emit electromagnetic signals and record the amplitude and phase spatial distribution of the target scattered echo. It usually works in the millimeter wave, submillimeter wave or terahertz waveband, and can realize high-resolution three-dimensional imaging and motion detection of targets at close distances (usually not far from 2 meters). It is mainly used for human security inspection, hidden dangerous goods detection and Industrial non-destructive testing and other fields. [0003] The Pacific Northwest National Laboratory (PNNL) is a typical representative in this area. Since the 199...

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Problems solved by technology

Although it has higher precision, the imaging method of slice by distance increases the amount of calculation and increases the time consumption of the algorithm

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