RF Distance Measurement Using Dynamic Transmitter Power
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Solution Overview
Problem
Existing RF distance measurement methods for mobile robots face errors due to obstacles between the signal generating module and the fixed module, leading to inaccurate measurements in indoor environments where line-of-sight is not guaranteed.
Innovation Solution
The method involves setting the transmitter power of the RF signal to a minimum to measure the longest distance when no obstacle is present, and if the distance is measurable, determining no obstacle exists; otherwise, increasing transmitter power to determine the presence of an obstacle and calculate the distance using pre-measured data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If transmitter power is set to minimum to measure longest distance when no obstacle exists, then measurement range is extended, but measurement accuracy deteriorates when obstacles are present
Solution Approach 1:
The transmitter power is made dynamic rather than fixed. The system adjusts transmitter power based on whether an obstacle is detected: using minimum power when no obstacle exists to extend measurement range, and increasing power when obstacles are present to maintain measurement accuracy. This dynamic adjustment resolves the contradiction between extended range and accurate measurement.
Solution Approach 2:
The system changes the transmitter power parameter based on obstacle detection results. By monitoring signal characteristics to detect obstacles and then adjusting the power parameter accordingly, the system achieves both extended measurement range (at minimum power) and maintained accuracy (when power is increased for obstructed paths).
2Measurement precision
If transmitter power is increased to improve measurement accuracy in obstructed environments, then measurement accuracy improves, but measurement range decreases
Solution Approach 1:
The system dynamically adjusts transmitter power based on real-time obstacle detection. When obstacles are detected through signal analysis, power is increased to maintain accuracy; when no obstacles are present, power is reduced to minimum to extend range. This dynamic behavior resolves the trade-off between accuracy and range.
Solution Approach 2:
The system performs preliminary obstacle detection by analyzing signal characteristics before final distance measurement. This preliminary action allows the system to prepare the appropriate transmitter power level in advance, ensuring both extended range capability and accurate measurement when needed.
3Reliability
If obstacle detection is implemented by analyzing signal characteristics, then obstacle presence can be determined, but system complexity increases
Solution Approach 1:
The system uses feedback from signal characteristic analysis to detect obstacles. By monitoring reflected or attenuated signal properties and feeding this information back to determine obstacle presence, the system achieves reliable detection without requiring complex additional hardware, thus balancing reliability with manageable 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
This approach improves the accuracy of distance measurement by distinguishing between obstacle presence and absence, reducing errors and enhancing measurement reliability in obstructed environments.
Implementation Method 1
the distance is measured using the time taken for the signal generating module to receive the signal generated and the speed of the signal
Data Source
AI summary
Provided are a method, apparatus, and medium for measuring a distance using a radio frequency (RF) signal. The method of measuring a distance includes setting the transmitter power of an RF signal of a signal generating module to a minimum so as to measure the longest distance when no obstacle exists, measuring a distance between the signal generating module and a fixed module using the RF signal whose transmitter power is set to the minimum, if the measured distance between the signal generating module and the fixed module is available, determining that no obstacle exists therebetween, and if the measured distance is not available, determining that an obstacle exists therebetween, and determining the distance according to the result of the determination of existence of an obstacle.