RF Tracking Transceiver PN Code Distance Measurement
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Solution Overview
Problem
Current autonomous RF tracking technologies rely on received signal strength indicator (RSSI) methods, which are inaccurate due to factors like attenuation and antenna patterns, leading to distance measurement inaccuracies.
Innovation Solution
The system uses pseudorandom noise (PN) coded signal pairs for accurate distance measurement by transmitting a unique PN code from a Tracking Transceiver to a Remote Transceiver and measuring the delay, allowing for precise location and identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RSSI method is used for tracking, then the system can provide autonomous RF tracking capability, but distance measurement accuracy deteriorates due to attenuation and antenna pattern variations
Solution Approach 1:
The patent replaces the RSSI-based tracking method with a time delay measurement method using pseudorandom noise coded signal pairs. Instead of relying on signal strength indication that is affected by attenuation and antenna patterns, the system measures the time delay between transmitted and received signals, which provides accurate distance measurement independent of these factors.
2Ease of operation
If signal strength measurement is used, then the system can provide simple tracking operation, but measurement accuracy deteriorates due to environmental factors
Solution Approach 1:
The patent substitutes signal strength measurement with time delay measurement of pseudorandom noise coded signals. This replacement maintains operational simplicity through automated signal processing while dramatically improving measurement accuracy by eliminating sensitivity to environmental factors like attenuation and antenna patterns.
3Device complexity
If RSSI-based tracking is implemented, then the system can operate with simple transceiver architecture, but tracking reliability deteriorates due to signal variation
Solution Approach 1:
The patent replaces RSSI-based tracking with pseudorandom noise coded signal pair transmission and time delay measurement. This substitution improves tracking reliability by measuring time delay instead of signal strength, while the transceiver architecture remains relatively simple through the use of standardized signal processing components.
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 provides accurate distance measurement and identification of Remote Transceivers, mitigating the effects of environmental factors and interference, enabling reliable tracking with distances up to 1000 meters and beyond.
Implementation Method 1
The Tracking Transceiver in turn measures the delay of the signal pair to get an accurate measurement of the Remote Transceiver distance
Data Source
AI summary
The Radiofrequency Identification and Location System represents a novel system and method for locating a Remote Transceiver by means of a Tracking Transceiver whereby the Tracking Transceiver transmits its identification (ID) to the Remote Transceiver which responds with its own ID. The IDs consist of unique PN code sequences which alternately can be PN cover codes and orthogonal codes. A Remote Transceiver can respond to multiple Tracking Transceivers simultaneously while a Tracking Transceiver can receive from multiple Remote Transceivers. By measuring the transit time of its transmitted PN code with respect to the PN code received from a Remote Transceiver, the Tracking Transceiver can measure the distance to that Remote Transceiver and home in gradually.