VHF RF Tracking Using Narrow Bandwidth Signals
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Solution Overview
Problem
Conventional RF-based tracking and location systems face inaccuracies and limited range when used indoors due to signal attenuation, scattering, and reflection, particularly at higher frequencies, making them ineffective in complex environments without extensive infrastructure and high power requirements.
Innovation Solution
The use of narrow bandwidth signals in the VHF or lower frequency bands, combined with digital signal processing and software-defined radio technologies, to minimize propagation loss and improve accuracy, allowing for accurate tracking and location of objects over longer ranges with reduced multipath interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UHF high frequency RF signals are used for tracking and location, then measurement precision can be improved, but signal attenuation and scattering increase significantly
Solution Approach 1:
The patent changes the frequency parameter from UHF (900 MHz) to VHF (150 MHz) and lower frequencies. This parameter change increases wavelength from 30 cm to 2 meters, which reduces signal attenuation and scattering in indoor environments while maintaining sufficient location accuracy through modified signal processing techniques
2Measurement precision
If UHF high frequency RF signals are used for tracking and location, then measurement precision can be improved, but device complexity and infrastructure requirements increase
Solution Approach 1:
The patent reduces operating frequency from 900 MHz to 150 MHz and lower, which extends operating range and reduces the number of readers needed to cover a given area. This parameter change simplifies infrastructure requirements while maintaining location accuracy through adjusted signal processing
3Length of stationary object
If higher transmitted signal power is used to extend operating range, then coverage area can be improved, but signal reflection and scattering increase
Solution Approach 1:
The patent changes the frequency parameter to lower values (VHF and below), which increases wavelength. This parameter change reduces signal reflection and scattering from objects in the environment, allowing extended operating range without increasing transmitted power or harmful reflections
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 enables accurate object tracking and location in both indoor and outdoor environments with increased operating range, reduced infrastructure needs, and lower power consumption, using standard hardware and software at a minimal incremental cost.
Implementation Method 1
RF-based identification and location-finding systems for determination of relative or geographic position of objects
Implementation Method 2
The distance measurements are used in triangulation/trilateration or virtual triangulation calculations
Data Source
AI summary
A method and system for a Radio Frequency (RF)-based identification, tracking and locating of objects. The method and system use a narrow bandwidth signal in VHF of lower frequency range, which minimizes propagation loss and loss of accuracy of the RF locating signals. The signal is sent from a Master Unit(s) to a Tag. The signal traveling time is recorded and the distance between the Master(s) and the Tag is calculated. The method and system allow achieving a longer distance of the RF signal penetration and an increased accuracy by using VHF bands. The techniques of Digital Signal Processing and Software-Defined Radio are used. The actual waveforms transmitted and received by the radios are defined by the software. The roles of the Master Unit(s) and the Tag can be reversed.