Ranging Device Noise Correction via Rising Time Standard Deviation
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Solution Overview
Problem
Current ranging devices face inaccuracies in distance estimation due to additive white Gaussian noise affecting the rising time of wireless signals, leading to errors in distance calculation, especially when signals are attenuated by obstacles or in dynamic channels, resulting in lower location accuracy.
Innovation Solution
A ranging method that selects a parameter set minimizing the standard deviation of the rising time of received wireless signals, correcting the trip time to improve distance estimation accuracy, and a device comprising a physical module, medium access control module, and ranging module to execute this method, considering additive white Gaussian noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the trip time is calculated using the rising time of the received wireless signal, then the distance can be estimated, but the additive white Gaussian noise causes the rising time to be spread, resulting in the estimated distance being shorter than the actual distance
Solution Approach 1:
The patent applies preliminary action by pre-calculating the standard deviation of the rising time before using it to correct the trip time. The system performs statistical analysis on the rising time characteristics in advance, storing the standard deviation value that will be used for correction. This preliminary statistical characterization of the noise-induced rising time spread enables the subsequent correction step to compensate for the systematic error, ensuring more accurate distance estimation.
2Measurement precision
If signal strength decay is used to estimate distance, then ranging can be performed, but channel response causes additional attenuation requiring channel estimation, increasing device cost
Solution Approach 1:
The patent extracts only the essential timing information (trip time based on rising time) needed for distance estimation, separating it from the more complex signal strength analysis approach. By focusing solely on the temporal characteristic (rising time) rather than amplitude characteristics (signal strength decay), the system avoids the need for channel estimation and related complex processing, thereby reducing device cost while maintaining ranging capability.
3Measurement precision
If channel response is considered for signal strength decay ranging, then distance estimation can be performed, but in fast changing channels the estimated distance may have large difference from actual distance
Solution Approach 1:
The patent replaces the mechanical/system-level approach of channel estimation and signal strength analysis with a simpler temporal measurement approach. Instead of analyzing signal amplitude characteristics that are heavily influenced by channel conditions, the system measures the rising time of the signal, which is a temporal property less susceptible to channel variations. This substitution of measurement domain (from amplitude to time) provides better adaptability to fast-changing channels.
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 method achieves higher accuracy in distance estimation and location determination by correcting for noise-induced errors in the rising time of wireless signals, enhancing the precision of ranging and location devices beyond conventional methods.
Implementation Method 1
calculate or count the trip time of the received wireless signal to estimate the distance between the object and the ranging device, wherein the trip time comprises the rising time of the received wireless signal since the trip time is the time difference between the rising time of the received wireless ranging signal and the rising time of the emitted wireless ranging signal
Implementation Method 2
considering the noise is the additive white Gaussian noise (AWGN) of the rising time of the received wireless ranging signal due to the noise
Implementation Method 3
strength of received signal can be reasonable reduced by which the objects absorb the electromagnetic wave (EMW) propagated from the transmitter to the receiver
Data Source
AI summary
A ranging method, executed in a ranging device, comprising steps of: among a plurality of parameter sets under a specific constraint, selecting one parameter set which minimizes a statistical value of a rising time of a received wireless signal; obtaining a trip time of the received wireless signal, wherein the received wireless signal is a wireless signal from an object; and estimating a distance between the object and the ranging device according to a corrected trip time, wherein the statistical value of the rising time of the received wireless signal corrects the trip time of the received wireless signal to generate the corrected trip time.