Calibration method and calibration system for improving preset accuracy of YTO

Abstract

The invention belongs to the signal processing technical field and relates to a calibration method and calibration system for improving the preset accuracy of a YTO. According to the calibration method and calibration system of the invention, a frequency measuring module can be additionally arranged in a programmable logic unit so as to measure middle frequency, so that the error of the practical output frequency and set frequency of the YTO can be obtained through calculation, and therefore, an outer connection testing instrument and device are not required, and testing connection can be simplified, and calibration cost can be decreased; and only two manual calculation points are required, and a group of obtained empirical values can be adopted as initial values of all loops, and therefore, manual debugging workload can be decreased. The calibration method and calibration system of the invention can realize instant calibration for devices which are insensitive to frequency switching time; the calibration method and calibration system of the invention can be more applicable to field working conditions; and the calibration method and calibration system can assist in avoiding influences of temperature drift and aging on the locking of the loops, so that the loops can work more stably and reliably.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a calibration method and a calibration system for improving YTO preset accuracy. Background technique [0002] Due to the advantages of the yttrium iron garnet tuned oscillator YTO in frequency coverage, tuning linearity, and spectral purity, broadband microwave synthesis signal generators widely use YTO as the core microwave oscillator. YTO is a solid-state microwave oscillator with yttrium iron garnet YIG balls as resonators and microwave transistors as active devices. Its output frequency has a good linear relationship with the internal tuning magnetic field. The high-performance YTO internal tuning magnetic field is generated by two parts, the main coil and the secondary coil. The former has a large inductive reactance, slow tuning but high tuning sensitivity, wide tuning range, and good high-frequency interference suppression; the latter has a small inductive react...

AI Technical Summary

Problems solved by technology

The advantage of this method is that no external test equipment is needed, and automatic calibration software can be used to realize automatic calibration, which reduces the workload of manual debugging and improves calibration efficiency; the disadvantage is that the preset value needs to be adjusted gradually during the calibration process, and the step is too The large deviation of the calibration value will lead to unsatisfactory calibration effect; too small step will cause the calibration process to be too slow and the calibration efficiency to be low

In addition, when the error voltage is basically equal to the reference voltage of the comparator, the output of the comparator circuit will appear unstable, and the lock-out judgment level changes frequently, making it impossible to accurately judge the state of the loop. An exception should be made for this phenomenon during the calibration process. processing, repeated detection and elimination of the phenomenon

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