Wi-Fi Sensing Exchange for Multi-Path Passive Target Tracking
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Solution Overview
Problem
Existing Wi-Fi devices are unable to accurately determine the location and instantaneous speed of passive targets due to limitations in angle of arrival precision and the requirement of line-of-sight conditions, leading to low precision and inability to measure multiple targets simultaneously.
Innovation Solution
A sensing measurement information exchange method and apparatus that utilizes bidirectional sensing measurements between stations to determine locations and instantaneous speeds of passive targets based on angle of arrival, relative time of flight, and Doppler frequency shift, employing a negotiation process, measurement announcement, and result exchange to enhance precision and enable simultaneous measurement of multiple targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If traditional radar detection principles are applied to Wi-Fi devices, then detection capability is achieved, but the ability to determine instantaneous speed of passive targets is lost
Solution Approach 1:
The patent segments the detection process into multiple independent transmission paths between first and second stations, with each path providing separate measurement data (angle of arrival, relative time of flight, Doppler frequency shift). This segmentation enables the system to process multiple targets simultaneously while maintaining measurement precision for each individual path.
Solution Approach 2:
The patent introduces sensing measurement report information as an intermediary data structure that carries measurement results from the second station to the first station. This intermediary mechanism enables the exchange of detailed measurement data including Doppler frequency shift, which is essential for determining instantaneous speed of passive targets.
2Measurement precision
If existing sensing technologies are used, then location measurement is possible, but measurement precision and ability to measure multiple targets simultaneously is limited
Solution Approach 1:
The patent divides the sensing measurement into multiple independent transmission paths, where each path corresponds to a specific target or signal component. By processing N groups of first measurement results from N different transmission paths, the system can simultaneously measure multiple targets while maintaining high precision for each measurement.
Solution Approach 2:
The patent adds the dimension of multiple transmission paths between two stations, transforming the single-path measurement into a multi-path measurement system. This dimensional expansion enables simultaneous measurement of multiple targets by utilizing the additional path information (angle of arrival, relative time of flight, Doppler frequency shift) from each path.
3Ease of operation
If line of sight requirement is imposed, then measurement simplicity is maintained, but adaptability to different environments is reduced
Solution Approach 1:
The patent uses sensing measurement report information as an intermediary that carries comprehensive measurement data from the second station. This intermediary mechanism eliminates the need for direct line of sight between the first station and passive targets, as the second station acts as a relay that collects and reports measurement data from multiple transmission paths, thereby enhancing environmental adaptability while maintaining measurement capability.
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 improves location measurement accuracy and system robustness by determining locations and instantaneous speeds of multiple passive targets with enhanced precision, overcoming limitations of existing technologies.
Implementation Method 1
A radar transmitting system transmits a specific electromagnetic wave signal. The electromagnetic wave signal is reflected by a target during propagation.
Implementation Method 2
A radar receiving system receives the reflected signal, compares the reflected signal with the transmitted signal, and calculates information such as a distance, a moving speed, and an orientation of the target.
Implementation Method 3
each group of first measurement results includes an angle of arrival, relative time of flight, and a Doppler frequency shift of a corresponding first transmission path
Implementation Method 4
relative time of flight
Implementation Method 5
utilize bidirectional sensing measurements between two stations to determine locations and instantaneous speeds of passive targets based on channel reciprocity
Data Source
AI summary
This application provides a sensing measurement information exchange apparatus, applied to a first station. The apparatus includes: a transceiver unit, configured to receive sensing measurement report information sent by a second station, where the sensing measurement report information includes N groups of first measurement results, where the N groups of first measurement results are in a one-to-one correspondence with N first transmission paths between the first station and the second station, and each group of first measurement results includes an angle of arrival, relative time of flight, and a Doppler frequency shift of a corresponding first transmission path; and a processing unit, configured to obtain angles of arrival, relative time of flight, and Doppler frequency shifts of the N first transmission paths based on the sensing measurement report information. This application implements measurement of locations and instantaneous speeds of a plurality of passive targets.