Local Oscillator Phase Correction Using Quasi-Reference Phase
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Solution Overview
Problem
The existing phase detection methods in distance measuring devices, particularly those using a VCO direct modulation method for transmission and a super-heterodyne method for reception, suffer from initial phase fluctuations in the local oscillator, leading to inaccurate distance measurements due to the change in frequency settings, which affects not only distance measurement but also other phase-detecting devices.
Innovation Solution
A phase correcting device is introduced, comprising a local oscillator with a PLL, a phase detector, a reference phase device, and a correction circuit that detects phase fluctuations and corrects the input signal using the detected phase difference, allowing for accurate distance measurement by stabilizing the initial phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a VCO direct modulation method is used for transmission unit, then power consumption is reduced, but initial phase fluctuates in the local oscillator
Solution Approach 1:
The patent applies preliminary action by detecting the initial phase of the local oscillator before distance measurement and storing it for later correction. The phase detector captures the initial phase state, and this stored value is subsequently used to correct phase fluctuations during measurement, allowing the system to maintain both low power consumption and measurement accuracy
Solution Approach 2:
The patent implements feedback by using the detected initial phase to correct the local oscillator phase during distance measurement. The correction unit continuously compares the current phase with the stored initial phase and applies corrections to compensate for fluctuations, creating a closed-loop system that maintains phase stability while using the power-efficient VCO direct modulation method
2Use of energy by moving object
If a super-heterodyne method is used for reception unit, then power consumption is reduced, but initial phase fluctuates in the local oscillator
Solution Approach 1:
The patent applies preliminary action by detecting the initial phase of the local oscillator before distance measurement and storing it for later correction. The phase detector captures the initial phase state, and this stored value is subsequently used to correct phase fluctuations during measurement, allowing the system to maintain both low power consumption and measurement accuracy
Solution Approach 2:
The patent implements feedback by using the detected initial phase to correct the local oscillator phase during distance measurement. The correction unit continuously compares the current phase with the stored initial phase and applies corrections to compensate for fluctuations, creating a closed-loop system that maintains phase stability while using the power-efficient super-heterodyne method
3Device complexity
If reference signals operate independently in each device, then device complexity is reduced, but distance measurement accuracy deteriorates
Solution Approach 1:
The patent applies copying by having one device (the reference device) generate a reference signal and transmit its phase information to the other device. Instead of requiring both devices to independently generate and synchronize complex reference signals, the system copies the reference phase information from one device to the other, simplifying individual device design while maintaining measurement accuracy through shared reference data
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables accurate distance measurement by stabilizing the initial phase, thereby improving the accuracy of distance measurement in devices using VCO direct modulation and super-heterodyne methods, and can be applied to various phase-detecting devices.
Implementation Method 1
a local oscillator including a PLL that generates a local oscillation signal based on a reference clock
Implementation Method 2
a phase detector that detects a phase of the local oscillation signal to output the phase of the local oscillation signal
Data Source
AI summary
A phase correcting device includes a local oscillator configured to give a local oscillation signal to a device configured to detect a phase of an inputted signal, a first phase detector configured to detect a phase of the local oscillation signal to output the phase of the local oscillation signal, a reference phase device configured to generate a quasi-reference phase corresponding to a reference phase of the local oscillation signal at a time of an initial setting of the local oscillator to output the quasi-reference phase, based on a reference clock, a second phase detector configured to detect a fluctuation amount of a phase of the local oscillator, based on the phase detected by the first phase detector and the quasi-reference phase, and a correction circuit configured to correct the phase of the inputted signal by using a detection result of the second phase detector.