UWB Ranging Waveform for Narrowband Interference Suppression
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Solution Overview
Problem
UWB ranging systems face reduced accuracy due to narrowband interference, which is not effectively suppressed, affecting the precision of distance measurement.
Innovation Solution
A UWB ranging method and system using a narrowband interference suppression waveform, where a template signal is generated by combining a channel estimation signal and a narrowband interference suppression waveform, and the distance is calculated based on the time delay of the correlation output signal, utilizing waveforms expressed by specific equations to suppress interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional UWB waveforms are used for ranging, then the system can achieve ultra-wideband communication with low power consumption, but narrowband interference occurs at specific frequencies reducing ranging accuracy
Solution Approach 1:
The patent extracts and removes the narrowband interference components from the received UWB signal by identifying and eliminating specific frequency components that cause interference, thereby isolating the useful ranging signal from the harmful interference
Solution Approach 2:
The patent changes the waveform parameters by applying specific time delays (δ1 and δ2) to the transmitted pulse waveform to create a modified waveform that is less susceptible to narrowband interference at specific frequencies, thereby improving ranging accuracy in the presence of interference
2Measurement precision
If UWB pulses with narrow width are used for high precision location determination, then location precision is improved, but the low output power characteristic makes the system more vulnerable to narrowband interference
Solution Approach 1:
The patent applies preliminary anti-action by pre-processing the received signal to suppress narrowband interference before the interference can degrade the ranging measurement, using correlation detection and waveform matching to reject interference components
Solution Approach 2:
The patent converts the harmful narrowband interference into a beneficial filtering effect by using the interference's specific frequency characteristics to enhance the detection of the useful signal through correlation processing, where the known waveform structure helps distinguish signal from interference
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 effectively suppresses narrowband interference, improving the accuracy of distance measurements and reducing ranging error ratios, as demonstrated by simulation results comparing conventional and proposed waveforms.
Implementation Method 1
generating a correlation output signal by convoluting the template signal and the signal received at the second step; and calculating a distance using a time delay when the correlation output signal has the maximum value
Data Source
AI summary
Disclosed herein is an Ultra-WideBand (UWB) ranging method using a narrowband interference suppression waveform. A transmission signal is transmitted to a target object. The transmission signal, reflected from the target object, is received. A template signal is generated by combining the narrowband interference suppression waveform and a channel estimation signal together. A correlation output signal is generated by convoluting the template signal and the received signal. A distance is calculated using a time delay when the correlation output signal has the maximum value thereof. The narrowband interference suppression waveform is any one of two waveforms that are expressed by the following Equation:wr1(t)=g(t−δ1/2)+g(t+δ1/2)wr2(t)=g(t−δ2/2)−g(t+δ2/2)where g(t) is a basic UWB pulse waveform, δ1=(N+1/2)f1, δ2=(N)/f1, N is an integer, and fi is the center frequency of a narrowband interference signal.