Ranging Transmitter Phase Measurement Accuracy Classification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ranging systems require simultaneous transmission and reception on two different frequencies, leading to inefficient use of frequency spectrum and susceptibility to noise, with accuracy issues due to unsynchronized reference clocks and environmental factors, and lack of clarity on measurement accuracy.
Innovation Solution
A system using a ranging transmitter and receiver pair that transmits at least three channels, receives reflected instances, and employs a processor to determine phase changes and signal strength, plotting phase measurements for linearity and performing FFT to classify measurements for accuracy, enabling frequency hopping and multipath correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If simultaneous transmission and reception on two different frequencies is used, then distance measurement can be achieved, but frequency spectrum efficiency deteriorates and noise susceptibility increases
Solution Approach 1:
The patent employs periodic frequency hopping where the transmitter sequentially transmits on multiple frequencies over time rather than simultaneously occupying two frequencies. This periodic action allows the system to achieve distance measurement while improving frequency spectrum efficiency by utilizing available channels in a time-division manner, directly resolving the contradiction between measurement capability and spectrum efficiency
Solution Approach 2:
The system changes the frequency parameter dynamically through frequency hopping across multiple channels according to a pseudorandom sequence. By varying the frequency parameter over time rather than fixing it, the system achieves both accurate distance measurement and efficient spectrum utilization, resolving the contradiction between measurement precision and energy loss
2Measurement precision
If reference marker clock signals are used for range calculation, then distance measurement can be performed, but range errors increase if clocks are not synchronized
Solution Approach 1:
Each station independently generates its own reference marker clock signals without requiring synchronization with the other station. The ranging measurement is calculated based on the local clock signals at each end, eliminating the synchronization problem entirely. This self-service approach resolves the contradiction by making the system reliable without requiring clock synchronization while maintaining range measurement capability
Solution Approach 2:
The patent segments the ranging measurement process into independent operations at each station, where each station performs its own phase measurement and range calculation using its local clock. This segmentation eliminates the need for synchronized clocks between stations, resolving the contradiction between measurement precision and reliability
3Measurement precision
If classification based on linearity and multipath detection is added, then measurement accuracy can be verified, but device complexity increases
Solution Approach 1:
The system implements feedback mechanisms where classification results from linearity analysis and multipath detection are used to validate and potentially correct the ranging measurement. This feedback loop provides measurement accuracy verification while using efficient algorithms that balance the need for verification with computational complexity, resolving the contradiction between precision improvement and device 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
The system achieves high-resolution range measurements with low bandwidth utilization, accurate distance calculation, and multipath detection, providing a classification for each measurement to ensure accuracy and reliability.
Implementation Method 1
transmits at least three channels to an active reflecting receiver
Implementation Method 2
receives reflected instances of the at least three transmitted channels from the active reflecting receiver
Implementation Method 3
determines a ranging measurement between the ranging transmitter and the active reflecting receiver based on measured phase changes
Data Source
AI summary
A system is provided with a ranging transmitter and receiver pair or a transceiver pair. The system classifies a group of radio frequency (RF) channels between ranging transmitter and receiver pairs. In a first scenario, a ranging transmitter transmits at least three channels to an active reflecting receiver. A ranging receiver then receives reflected instances of the at least three transmitted channels from the active reflecting receiver. A processor of the system then determines a ranging measurement between the ranging transmitter and the active reflecting receiver based on measured phase changes and received signal strength and assigns a classification to the determined ranging measurement indicating a relative level of accuracy for the determined ranging measurement. The classification may be a general classification, a linearity classification, a multipath classification, or a combination classification that is based on both a linearity classification and a multipath classification.