3 results about "Phase correction" patented technology

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.

The invention discloses a method for detecting and correcting an unpacking phase error based on phase distribution, and the method is suitable for obtaining the phase when phase unpacking is carried out by adopting an information assistance method. The method mainly comprises the following steps of setting a threshold based on the gradient distribution of an unpacking phase, and obtaining a phasediagram edge; determining all points in which unpacking phase errors may exist by the detected phase diagram edge and a region enclosed by a closed edge; and performing error correction on these points, and obtaining the correct phase distribution. According to the method of the invention, due to the fact that two processes of phase error detection and correction are separated, effective labelingof phase discontinuous regions is also realized in the phase error detection, so that there is no need to use mass chart guidance to avoid the discontinuous regions during phase correction, and the method has robustness and efficiency.