Phase detection method based on only amplitude detection

Abstract

The invention discloses a phase detection method based on only amplitude detection. The method comprises the following steps: an arbitrary reference signal s0(t) is selected, and a receiving signal s(t) to be reconstructed is endued with an arbitrary initial value; the gradient of a cost function phi is calculated; the Polak-Ribere conjugate gradient of the cost function phi is calculated; the optimum step length gamma of variation along the direction of the conjugate gradient is calculated; whether the phi is less than the error standard required to be met or not is judged, and if the phi is less than the error standard, the signal expected to be released is calculated by using a formula that s(tk) is equal to Sigma (Xin+jgamman)e<-j2Pi(kn / (2N+1))>, then the loop exits; and otherwise, if the phi is equal to or more than the error standard, the iteration continues. By using the method, the invention realizes the phase detection based on the only amplitude detection, solves the difficult problem that the phase retrieval method needs apriori information in various fields of X-ray crystallography, optics, astronomical image processing, and the like, and lays the foundation of the phaseless detection imaging principle, therefore, the hardware cost of the microwave, the terahertz and the optic imaging system can be greatly reduced.

Description

technical field [0001] The invention relates to the technical fields of signal and image processing, microwave measurement, microwave or THz imaging, etc., and in particular to a phase detection method for detecting the phase of a received signal only by measuring the amplitude of the signal, so as to greatly reduce the complexity of the receiver system and reduce the Receiver hardware cost, improve phase measurement accuracy. Background technique [0002] The phase measurement of signals has developed rapidly almost with the development of military radio electronics and communication and broadcasting, especially the development of phased array radar technology, which requires a large number of components such as electronically controlled phase shifters of antenna elements. Measurement. At present, the phase measurement of signals is widely used, such as near-field measurement of antennas, microwave imaging, THz imaging, production and development of microwave devices, etc....

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Problems solved by technology

[0008] (2) Bandwidth: the bandwidth of a common quadrature demodulator is difficult to reach 10% of the center frequency;

[0011] (5) Frequency conversion loss, insertion loss: it will cause the attenuation of the received signal;

[0012] (6) 1dB compression point, third-order intermodulation: it will cause nonlinear distortion of the received signal;

[0013] (7) Signal imbalance of I / Q channel

However, in the usual microwave measurement, only the amplitude of the signal can be obtained, and there is no prior information in its Fourier (or inverse Fourier) transform domain, thus limiting the application of these phase recovery methods in the field of microwave measurement

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