A phase calibration system and method for a multi-channel direction-finding receiver

Abstract

The invention discloses a phase calibration system and method of a multi-channel direction-finding receiver. The system comprises a signal processing module, a storage module, a calibration module, acalibration antenna and multiple signal receiving assemblies. A corresponding signal receiving antenna is arranged at the front end of each signal receiving assembly. Each signal receiving assembly comprises a filter, a limiter, an SP2T switch, a frequency conversion channel and an ADC module. The frequency conversion channel of one of the signal receiving assemblies is a reference channel, and the frequency conversion channels of the other signal receiving assemblies are phase measuring channels. The signal processing module is used for controlling signal generation of a calibration source and switching of the SP2T switch, processing received signals and acquiring phase calibration tables at different temperatures. The phase calibration tables of the signal receiving assemblies where thephase measuring channels are located at different temperatures can be generated to be used for phase calibration in the direction-finding process, the phase calibration precision is improved, and thedirection-finding performance of the receiver is guaranteed.

Description

technical field [0001] The invention relates to the field of communication direction finding, in particular to a phase calibration system and method of a multi-channel direction finding receiver. Background technique [0002] Modern reconnaissance and direction-finding receivers have the characteristics of wide operating frequency band and high frequency points, from hundreds of MHz to tens of GHz, limited by the existing analog-to-digital conversion (ADC) devices, it is impossible to perform digital processing directly at the back end of the antenna, usually The method adopted is to use a superheterodyne receiver to down-convert the radio frequency signal from the antenna to an intermediate frequency, and then process it. The intermediate frequency signal that reaches the phase detection module passes through multiple modules such as the antenna unit, radio frequency channel, and frequency conversion channel. Whether it is the antenna and radio frequency channel at the fron...

AI Technical Summary

Problems solved by technology

[0002] Modern reconnaissance and direction-finding receivers have the characteristics of wide operating frequency band and high frequency points, from hundreds of MHz to tens of GHz, limited by the existing analog-to-digital conversion (ADC) devices, it is impossible to perform digital processing directly at the back end of the antenna, usually The method adopted is to use a superheterodyne receiver to down-convert the radio frequency signal from the antenna to an intermediate frequency, and then process it. The intermediate frequency signal that reaches the phase detection module passes through multiple modules such as the antenna unit, radio frequency channel, and frequency conversion channel. Whether it is the antenna and radio frequency channel at the front end, or the microwave components such as frequency mixing, filtering, and amplification in the frequency conversion channel, the consistency of frequency, phase and amplitude phase characteristics is limited, and the difference in the length of the connecting cable of the local oscillator will also cause a large phase change;

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