High-Resolution Distance and Speed Measurement Using Phase Information
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Solution Overview
Problem
Existing distance and speed measurement systems face challenges in achieving high accuracy and reliability, especially in complex multipath environments and with moving objects, while also requiring limited signal transmission and analysis bandwidth.
Innovation Solution
A method and system that utilize multiple executions of electromagnetic signal transmissions at different frequencies to determine phase information, forming a measurement matrix, which compares with stored reference objects to calculate the distance and speed between objects, allowing for high-resolution measurements even in challenging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic signals are transmitted at multiple different frequencies with multiple executions to improve measurement accuracy, then distance and speed measurement precision is improved, but signal transmission bandwidth requirements increase
Solution Approach 1:
The patent applies parameter changes by measuring phase information at multiple different frequencies (first and second frequencies) and combining these measurements to determine distance and speed. By changing the frequency parameter and executing multiple measurements at different frequency values, the system achieves high-resolution measurements without requiring excessive bandwidth at any single frequency, thus resolving the contradiction between measurement precision and bandwidth consumption.
2Reliability
If phase information from multiple frequency executions is used to form measurement matrix for high-resolution measurements, then measurement reliability in multipath environments is improved, but system complexity increases
Solution Approach 1:
The patent segments the measurement process into multiple independent frequency executions, where phase information is measured separately at different frequencies and then combined to form a measurement matrix. This segmentation allows the system to process complex multipath environments by breaking down the overall measurement into manageable frequency-specific components, improving reliability without overwhelming system complexity.
Solution Approach 2:
The patent adds the frequency dimension to the measurement process by performing multiple executions at different frequencies. This dimensional expansion transforms the measurement space, allowing the system to distinguish between direct path and multipath signals through frequency-dependent phase characteristics, thereby improving measurement reliability in challenging environments.
3Measurement precision
If multiple executions at different frequencies are performed to determine phase information, then speed measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The patent employs periodic action by executing the signal transmission and phase measurement process multiple times at different frequencies in a structured sequence. This periodic execution at alternating frequencies allows the system to gather sufficient phase information for accurate speed measurement while maintaining a rhythmic, efficient measurement pattern that minimizes overall measurement time.
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 and reliable distance and speed measurements between objects, particularly in multipath environments and with moving objects, by using phase information from multiple frequency executions to determine the closest matching reference object, thus overcoming bandwidth limitations.
Implementation Method 1
transmitting a first signal at a first frequency from the first object with at least one first antenna; receiving the first signal at the second object with at least one second antenna; transmitting a second signal at a second frequency from the second object with the at least one second antenna; and receiving the second signal at the first object with the at least one first antenna
Data Source
AI summary
A method and a system for high-resolution measurement of distance between two objects by means of electromagnetic waves is such that measurements are performed in a reliable, simple, and quick manner with low bandwidth and high accuracy even in complicated multipath environments and/or with moving objects. The method includes determination of a supposed distance and/or supposed relative speed between first and second objects from an object of measurement by comparing the object of measurement with a set of stored and/or calculated reference objects of measurement. The reference objects of measurement relate to different distances and different relative speeds, each reference object being associated with a distance and a speed. The supposed distance and/or speed is assumed to be the distance and/or speed that is associated with the stored and/or calculated reference object of measurement that best fits, is closest to, and/or is most similar to the object of measurement.