Terahertz active imaging radar system phase compensation method

Abstract

The invention discloses a terahertz active imaging radar system phase compensation method. The method comprises the following steps: S1) opening an internal calibration channel; S2) obtaining phase information of a terahertz wave echo signal of the internal calibration channel; S3) extracting phase error of the terahertz wave echo signal of the internal calibration channel; S4) through a polynomial fitting phase correction function, obtaining monomial and nonlinear term coefficient values of the phase correction function; S5) opening a reception channel; S6) obtaining an intermediate frequency echo signal of the reception channel; S7) analyzing the intermediate frequency echo signal of the reception channel to obtain target distance information; and S8) according to the target distance information and the phase correction function in the step S4), calculating compensation phase, and finishing phase compensation of intermediate frequency echo signal data of the reception channel according to the calculation result of the compensation phase. The advantages are that compared with a conventional phase compensation method, the method is high in adaptation, and can overcome the defects of a conventional terahertz active imaging radar phase compensation method.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a phase compensation method for a terahertz active imaging radar system. Background technique [0002] The wavelength of the terahertz frequency band is much smaller than that of existing microwaves and millimeter waves. The terahertz frequency band is more suitable for realizing large signal bandwidth and ultra-high distance resolution. It can achieve high azimuth resolution in a small coherent accumulation angle, so as to obtain the High-resolution imaging information. At present, the main function of the terahertz active imaging radar system is imaging, including one-dimensional range image, ISAR imaging and three-dimensional imaging. The block diagram of the traditional terahertz active imaging radar system is as follows: figure 1 shown. [0003] The terahertz active imaging radar system adopts coherent intermediate frequency local oscillator generation tech...

AI Technical Summary

Problems solved by technology

However, in the practical application of terahertz band radar, it is difficult to obtain ideal point targets, and this method is difficult to apply under the condition of moving targets

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