Low-Clock Distance Measurement Using Overlapping Signal Counts
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Solution Overview
Problem
Existing methods for measuring distance between devices using low clock rate signals suffer from high errors and are costly due to the need for high-frequency clock signal generators.
Innovation Solution
A method employing two low-frequency clock signals with a uniform difference to precisely measure distance by counting clock signals and calculating distance using overlapping signal counts, reducing the need for high-frequency components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high frequency clock signal is used to measure distance, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system dynamically switches between two different clock frequencies (first clock frequency and second clock frequency) based on the measurement phase. During the measurement period, it uses the first clock frequency, and during the overlap detection period, it uses the second clock frequency. This dynamic frequency switching allows the system to achieve high measurement precision while using lower frequency clocks, thereby reducing device complexity and cost.
Solution Approach 2:
The invention changes the clock frequency parameter from a single high frequency to two different frequencies. By using a first clock frequency for distance measurement and a second clock frequency for overlap detection, the system can achieve accurate measurements without requiring continuously high-frequency operation, thus reducing the complexity of the clock signal generator.
2Measurement precision
If a high frequency clock signal is used to measure distance, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The system dynamically switches between two different clock frequencies (first clock frequency and second clock frequency) based on the measurement phase. During the measurement period, it uses the first clock frequency, and during the overlap detection period, it uses the second clock frequency. This dynamic frequency switching allows the system to achieve high measurement precision while using lower frequency clocks, thereby reducing device complexity and cost.
Solution Approach 2:
The invention changes the clock frequency parameter from a single high frequency to two different frequencies. By using a first clock frequency for distance measurement and a second clock frequency for overlap detection, the system can achieve accurate measurements without requiring continuously high-frequency operation, thus reducing the complexity of the clock signal generator.
Data Source
AI summary
Provided is an apparatus and a method of measuring a distance between devices using a low clock frequency signal. The apparatus includes clock frequency generators, counters, a controller and a calculator for determining the distance based on clock signal overlap. Radio waves are transmitted and a number of clocks of a clock signal having a clock frequency b are counted, and if the transmitted radio waves are received again, a number of clocks of a clock signal having a clock frequency a are counted. If the clock signals having the clock frequencies a and b overlap with each other, counting of the numbers of the clocks of the clock signals having the frequencies b and a stops, and the distance is measured using the count values of the clock signals having the clock frequencies a and b. As a result, number of clocks of clock signals having low clock frequencies with a uniform difference can be counted to precisely measure a distance.