OCXO Real-Time Frequency Correction for Stable Receiver Output
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Solution Overview
Problem
Ground electromagnetic receivers face challenges with poor correction precision and long correction durations due to aging crystal oscillators and over-adjustment issues, leading to inaccurate frequency outputs.
Innovation Solution
A real-time correction method for oven controlled crystal oscillators involves frequency multiplication to generate measurement signals, identifying rising edges, and adjusting the reference clock signal based on frequency differences to ensure stability and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ground electromagnetic receiver is corrected once by means of energization, then the initial correction is completed, but the output precision becomes lower over time due to aging rate of crystal oscillator
Solution Approach 1:
The patent implements continuous frequency monitoring and correction by repeatedly measuring the frequency of the reference clock signal and adjusting it based on deviation from the standard frequency. This continuous action maintains measurement precision over time without requiring prolonged periodic corrections, resolving the contradiction between maintaining precision and minimizing correction duration.
Solution Approach 2:
The system measures the actual frequency of the reference clock signal, compares it with the standard frequency, and uses the deviation information to adjust the crystal oscillator frequency. This feedback mechanism ensures continuous precision maintenance while avoiding excessive correction time by only correcting when necessary.
2Measurement precision
If the ground electromagnetic receiver is adjusted after being stabilized, then the correction is performed, but the adjustment method has larger errors and needs more time
Solution Approach 1:
The patent performs frequency measurements and corrections during the stabilization process itself, rather than waiting for complete stabilization before correction. By conducting preliminary frequency checks and adjustments during stabilization, the system achieves high correction precision without adding extra adjustment time after stabilization.
Solution Approach 2:
The patent replaces manual or mechanical adjustment methods with automated electronic frequency measurement and control. The system uses digital frequency measurement circuits and automated control algorithms to achieve precise corrections rapidly, eliminating the larger errors and extended times associated with manual adjustment methods.
3Measurement precision
If frequency multiplication is performed on the reference clock signal, then measurement precision is improved, but the device complexity increases
Solution Approach 1:
The frequency multiplication circuit serves multiple functions: it generates measurement signals for frequency deviation detection, provides timing signals for correction operations, and enables precise frequency comparison. By making the frequency multiplication component multi-functional, the patent achieves high measurement precision without proportionally increasing overall device complexity.
Data Source
AI summary
The present disclosure provides a real-time correction method for an Oven Controlled Crystal (Xtal) Oscillator (OCXO) and an electromagnetic receiver. The real-time correction method for an OCXO includes: performing frequency multiplication on a reference clock signal to generate a first measurement signal and a second measurement signal; identifying a rising edge of each pulse per second on the basis of the first measurement signal to obtain a gate time T; obtaining a frequency of the second measurement signal according to the gate time T; and adjusting a frequency of the reference clock signal at least on the basis that an absolute value of a difference between two adjacent frequencies obtained of the second measurement signal is greater than a standard frequency difference.