Local Oscillator Phase Correction for Accurate Distance Measurement
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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 and a super-heterodyne method is used for reception to reduce power consumption, then power consumption is reduced, but initial phase fluctuates in the local oscillator leading to inaccurate distance measurement
Solution Approach 1:
The patent implements a feedback mechanism where the phase detector continuously monitors the phase of the local oscillation signal and generates a correction signal based on detected phase deviations. This correction signal is fed back to the phase correcting device to compensate for initial phase fluctuations, thereby maintaining measurement accuracy while using the low-power VCO direct modulation and super-heterodyne methods
Solution Approach 2:
The patent applies preliminary action by using the phase correcting device to pre-compensate for expected phase fluctuations before they affect the measurement. The system detects and corrects phase deviations in advance, ensuring that the distance measurement calculation is based on stabilized phase information, thus maintaining accuracy without increasing power consumption
2Adaptability or versatility
If frequency settings change in the local oscillator, then adaptability is improved, but initial phase fluctuates leading to deterioration of measurement precision
Solution Approach 1:
When frequency settings change in the local oscillator, the phase detector detects the resulting phase deviations and generates correction signals that are fed back to compensate for these changes. This feedback mechanism ensures that measurement precision is maintained even as the system adapts to different frequency settings, resolving the contradiction between adaptability and precision
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the phase correction based on the detected phase deviations caused by frequency setting changes. The phase correcting device modifies its correction parameters in response to frequency changes, allowing the system to maintain accurate phase detection across different operating frequencies
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 fluctuations, ensuring precise calculation of the propagation delay and subsequently the distance between devices, even when frequency settings change, thus improving the reliability of distance measurement systems.
Implementation Method 1
a phase detector configured to detect a phase of the local oscillation signal to output the phase of the local oscillation signal
Implementation Method 2
a local oscillator including a PLL configured to generate a local oscillation signal based on a reference clock
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.