Frequency calibration system of electrically tuned duplexer

Abstract

The invention discloses an automatic frequency calibration system of an electrically tuned duplexer, and relates to the field of microwave communication. The system comprises a frequency calibration unit, a first switch, a second switch, a generating tuned filter, a receiving tuned filter, a circulator, a radio frequency self-circulator, a low-noise amplifier and the like, wherein the frequency calibration unit is used for carrying out variable frequency amplifying and filtering on received signals, sequentially sampling, comparing, judging and counting filtered signals, and outputting a specified generating frequency to the generating tuned filter or outputting a specified receiving frequency to the receiving tuned filter after a preset threshold is reached. Through cooperation of the frequency calibration unit and the switches, the electrically tuned duplexer achieves automatic frequency calibration and has the characteristics of high intelligent and automatic degrees; the work frequency can be automatically changed and calibrated within a wide frequency range through electromechanical combination and software-hardware combination; the tuning speed is high; the accuracy and the stability of the work frequency of the duplexer are kept in high and low temperature environments; and the frequency calibration system is the automatic frequency calibration system of the electrically tuned duplexer with high universality and high integration.

Description

technical field [0001] The invention relates to an automatic frequency calibration system for a microwave electric duplexer in the communication field, which can quickly and accurately change the frequency of the electric duplexer, and is especially suitable for high-frequency and wide-band communication equipment. Background technique [0002] The Chinese utility model patent with the patent number CN201320615583.X in the prior art discloses "a C-band electronically adjustable duplexer". The currently used electronically adjustable duplexer only uses a set of fixed calibration data at room temperature. The data is stored in the single-chip microcomputer, and the stepping motor of the electric tuning filter is controlled by the single-chip microcomputer to change the frequency of the electric tuning filter. Due to changes in vibration and ambient temperature, the center frequency deviates, and the ESC filter does not have frequency self-test capability, so it cannot determin...

AI Technical Summary

Problems solved by technology

Due to vibration and changes in ambient temperature, the center frequency deviates, and the ESC filter does not have frequency self-test capability, so it cannot determine whether the frequency is accurate, so it cannot self-recover the original frequency, which affects the normal operation of communication equipment

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