Double-channel high-precision phase calibration system and method

Abstract

The invention discloses a double-channel high-precision phase calibration system. The double-channel high-precision phase calibration system is characterized by comprising a calibration signal source,an internal calibration assembly, an analog receiver and an ADC signal acquisition and signal processing system; two paths of calibration signals are output by the calibration signal source to be injected into the internal calibration assembly, the internal calibration assembly outputs the two paths of calibration signals, and the two paths of calibration signals are transmitted to the analog receiver through cables; the analog receiver transmits the received signals to the ADC signal acquisition and signal processing system for processing, and the total phase difference of the two paths of signals is obtained; and meanwhile, the analog receiver is used for returning the partially received signals to the internal calibration assembly along the original path, the internal calibration assembly transmits the returned signals to the ADC signal acquisition and signal processing system, and the phase difference of the cables is extracted. According to the double-channel high-precision phasecalibration method, calibration is carried out on the phase error between the multiple receiving links, the phase error of the connecting cables is eliminated simultaneously, and the calibration precision can reach 0.07 degree.

Description

technical field [0001] The invention relates to the technical field of interference radar, in particular to a dual-channel phase calibration technology. Background technique [0002] The ground elevation measurement accuracy of the interferometric radar system is affected by many interferometric parameter errors, and the error sources mainly include instrument error, atmospheric transmission error, orbit error, geophysical error, data processing error, etc. The sources of these errors are diverse and have different effects. By taking corresponding measures to avoid or compensate, the performance of the entire altimetry system can be effectively improved. [0003] Among the above-mentioned various influencing factors, the influence of errors caused by the system itself is more serious. Due to temperature drift, aging, electromagnetic interference and other reasons, the amplitude-frequency and phase-frequency characteristics of the system will change, which will introduce hei...

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Problems solved by technology

[0007] In the traditional InSAR interferometric system, due to the low calibration accuracy of the phase, the phase calibration between channels does not consider the influence of the phase difference of the connecting cables in the calibration component, so there is no related patent

[0008] So far, there is no patent for the dual-channel high-precision phase calibration method described in this patent

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