Automatic frequency calibration algorithm of electrically tunable filter

Abstract

The invention discloses an automatic frequency calibration algorithm of an electrically tunable filter, and relates to the field of electrically tunable filters. In the automatic frequency calibration algorithm, first center frequency and passband bandwidth of the electrically tunable filter are detected; then a stepping motor is rotated according to calibration frequency and the current center frequency and passband bandwidth of the electrically tunable filter, and the electrically tunable filter is calibrated; during calibration, an output signal level of the electrically tunable filter is detected; and finally a frequency calibration result is determined according to an amplitude-frequency curve of the electrically tunable filter, and automatic frequency calibration of the electrically tunable filter is completed. An output signal of the electrically tunable filter is detected, stored and processed through detection equipment, the amplitude-frequency curve of the electrically tunable filter is obtained, accurate and rapid frequency calibration of the electrically tunable filter is realized according to the amplitude-frequency curve of the electrically tunable filter, the problem of center frequency deviation of the electrically tunable filter caused by the problems of equipment wear and change of environment temperature is solved, at the same time, the debugging of the electrically tunable filter is simplified, and the work efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of electronically adjustable filters, in particular to an automatic frequency calibration algorithm for electronically adjustable filters. Background technique [0002] The ESC filter is a filter whose center frequency can be continuously tuned within a certain frequency. It plays an important role in electronic countermeasures, radar and communication systems, and needs to carry a certain amount of power. It has frequency band division, frequency selection, suppression Functions such as interference and improving signal-to-noise ratio are very important components in microwave communication systems. [0003] The electric tuning filter adjusts the center frequency of the filter by controlling the length of the tuning rod with a stepping motor. tuning function. However, with the wear of the cavity of the filter device, the stepper motor drive, the tuning rod and other components during use and the change of...

AI Technical Summary

Problems solved by technology

However, with the wear of the cavity of the filter device, the stepper motor drive, the tuning rod and other components during use and the change of the ambient temperature, the corresponding relationship between the number of pulses of the stepper motor and the frequency will change. The center frequency of the instrument deviates from the

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