Distance Measurement Device Phase Correction Feedback
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Solution Overview
Problem
Existing distance measurement systems using a voltage-controlled oscillator (VCO) direct modulation method in the transmitting unit and a superheterodyne (SH) method in the receiving unit face challenges in achieving accurate distance measurement due to initial phase differences between devices, leading to errors in phase detection and calculation.
Innovation Solution
A distance measurement device and method that employs a configuration where a VCO direct modulation method is used in the transmitting unit and an SH method in the receiving unit, utilizing phase information from both devices to calculate distance accurately by transmitting and receiving carrier signals with different frequency groups, and correcting for initial phase changes through phase detection and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If VCO direct modulation method is used in transmitting unit and SH method in receiving unit, then power efficiency is improved, but measurement precision deteriorates due to initial phase differences between devices
Solution Approach 1:
The patent implements feedback by having the receiving unit transmit its initial phase information back to the transmitting unit. The transmitting unit then uses this feedback information to correct its phase detection results, eliminating the measurement error caused by initial phase differences while maintaining the power-efficient VCO direct modulation and SH method architecture
Solution Approach 2:
The patent changes the parameter being measured from raw phase difference to corrected phase difference by incorporating initial phase information. This parameter transformation allows the system to compensate for the harmful effect of initial phase offsets while preserving the energy-efficient transmission and reception methods
2Device complexity
If phase detection is performed without correcting initial phase differences, then device complexity is reduced, but measurement precision deteriorates due to phase detection errors
Solution Approach 1:
The system uses feedback by exchanging initial phase information between transmitting and receiving units. This enables accurate distance measurement through phase correction without requiring complex hardware modifications, achieving high precision while maintaining relatively simple device architecture
Solution Approach 2:
The patent introduces initial phase information as an intermediary element that mediates between the transmitting and receiving units. This intermediary data enables the correction of phase detection errors without directly complicating the core phase detection mechanism, thus improving accuracy with minimal increase in system complexity
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
Enables accurate distance measurement between devices, even when using VCO direct modulation and SH methods, by correcting for initial phase differences and expanding the detection range, thus preventing erroneous distance determination and improving power efficiency.
Implementation Method 1
a voltage-controlled oscillator (VCO) direct modulation method in the transmitting unit
Implementation Method 2
a superheterodyne (SH) method in the receiving unit
Data Source
AI summary
A first device includes: a first reference signal source; a first transmitting/receiving unit which transmits two or more first carrier signals and receives two or more second carrier signals using an output of the first reference signal source; and a calculating unit. A second device includes: a second reference signal source configured to be operated independently from the first reference signal source; and a second transmitting/receiving unit configured to transmit two or more second carrier signals and receive two or more first carrier signals using an output of the second reference signal source. A frequency group of two or more first carrier signals and a frequency group of two or more second carrier signals differ from each other. The calculating unit calculates a distance between the first device and the second device based on a phase detection result obtained by receiving the first and second carrier signals.