Automatic Tuning Device for Magnetron Radar Frequency Control
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Solution Overview
Problem
Existing magnetron radar systems face challenges in suitably controlling the frequency of carrier signals during the tuning process, particularly due to temperature-dependent variations in the magnetron's frequency properties.
Innovation Solution
An automatic tuning device is introduced, which includes an output unit for generating a tuning control voltage, an acquisition unit for acquiring a tuning indication voltage, a setting unit for establishing a reference value, a calculation unit for calculating an index value based on scanning results, and a determination unit for adjusting the tuning control voltage based on the comparison between the index value and the reference value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional tuning control is used without considering temperature transitions, then the device complexity is reduced, but the frequency control precision deteriorates due to magnetron temperature dependence
Solution Approach 1:
The system performs preliminary tuning in a first period to establish a reference value before the second period tuning. This preliminary action stores baseline data that guides subsequent tuning operations, allowing the system to anticipate temperature-induced frequency shifts and adjust accordingly, thereby improving frequency control precision without proportionally increasing complexity
Solution Approach 2:
The system implements feedback control by comparing the tuning indication voltage in the second period against the reference value established in the first period. The determination unit adjusts the tuning control voltage based on this comparison, creating a closed-loop system that compensates for temperature drift and maintains accurate frequency control
2Adaptability or versatility
If the tuning range is expanded to cover temperature variations, then the adaptability is improved, but the time required for tuning increases
Solution Approach 1:
The tuning process is segmented into two distinct periods: a first period for establishing reference values over a wide tuning range, and a second period for rapid adjustment using the reference data. This segmentation allows comprehensive temperature coverage while reducing overall tuning time by avoiding redundant scanning in subsequent adjustments
Solution Approach 2:
The first period serves as a preliminary phase where the system characterizes the full tuning range and stores reference values. This preliminary characterization enables the second period to perform rapid, targeted adjustments without re-scanning the entire range, thus maintaining high adaptability to temperature changes while significantly reducing tuning time
3Stability of the object's composition
If the tuning control voltage is adjusted frequently to track temperature changes, then the frequency stability is improved, but the productivity decreases due to repeated tuning operations
Solution Approach 1:
The system employs periodic tuning operations divided into distinct phases: an initial comprehensive tuning period followed by shorter adjustment periods. This periodic structure maintains frequency stability through regular adjustments while optimizing productivity by reducing the frequency and duration of tuning operations after the initial characterization
4Measurement precision
If the reference value is established based on maximum tuning indication voltage, then the measurement precision is improved, but the device complexity increases due to additional processing requirements
Solution Approach 1:
The system replaces complex mechanical or hardware-based tuning mechanisms with signal processing operations. By using the acquisition unit to measure tuning indication voltage and the determination unit to process this data against reference values, the system achieves precise tuning point detection through computational methods rather than mechanical adjustments, improving precision while keeping complexity manageable
Data Source
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AI summary
[Problem] To more suitably control the frequency of a carrier signal given to a mixer in a tuning process. [Solution] An automatic tuning device comprises: an output unit that outputs a tuning control voltage for adjusting the frequency of a carrier signal to be given to a mixer; an acquisition unit that acquires a tuning instruction voltage which indicates the intensity of a component of a prescribed frequency in an output signal of the mixer; a setting unit that sets a reference value on the basis of a prescribed range, which includes a first level that is a tuning control voltage corresponding to the maximum tuning instruction voltage, in a first period; a calculation unit that calculates an index value on the basis of the result of scanning of a first range including the first level, in a second period; and a determination unit that determines the output level of a tuning control voltage which is output by the output unit, on the basis of the result of comparing the index value and the reference value.