THz Pulsed Radar Range Ambiguity Elimination via Temporal Broadening
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Solution Overview
Problem
Existing wireless sensing technologies face challenges in providing full spectrum awareness and efficient resource allocation due to periodic or continuous sensing transmissions, leading to interference, spectral inefficiency, and performance degradation, especially in decentralized networks with diverse applications like extended reality and autonomous vehicles.
Innovation Solution
A method and apparatus for wireless sensing that utilizes a sequence of radar pulses, leveraging temporal broadening effects in the THz band to accurately estimate range and velocity by analyzing the temporal broadening of reflected pulses, thereby resolving range ambiguity and improving sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic or continuous sensing transmissions are used, then sensing coverage is improved, but spectral efficiency deteriorates and interference increases
Solution Approach 1:
The patent employs periodic pulsed radar transmissions instead of continuous sensing, where the radar emits discrete pulses at specific intervals. This periodic action maintains sensing coverage by regularly probing the environment while significantly improving spectral efficiency by leaving gaps between transmissions where other communications can occur, thus reducing overall spectral congestion and interference.
2Measurement precision
If radar pulses are transmitted at high frequency, then sensing resolution is improved, but range ambiguity increases
Solution Approach 1:
The patent uses temporal broadening as a preliminary characteristic to predict and identify future sensing transmissions before they occur. By analyzing the broadening effect of reflected pulses, the system can determine the range to objects and predict when subsequent pulses will return, thereby resolving range ambiguity before it affects measurement precision. This allows high-frequency pulsing for resolution without losing range information.
3Adaptability or versatility
If decentralized sensing is implemented, then application diversity is improved, but coordination difficulty increases
Solution Approach 1:
The patent implements feedback mechanisms where each decentralized radar device monitors temporal broadening characteristics of received pulses and adjusts its transmission timing accordingly. This feedback loop allows autonomous devices to coordinate their sensing transmissions without centralized control, enabling diverse applications like extended reality and autonomous vehicles to operate simultaneously while reducing interference through self-organized timing coordination.
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
Enhances spectral efficiency and reduces interference by accurately identifying and predicting sensing transmissions, enabling high-resolution sensing with cm-level accuracy and terabit/sec communication in decentralized networks.
Implementation Method 1
obtaining a range of the object based on a temporal broadening of the reflected pulse
Implementation Method 2
receiving a reflected pulse after the transmitting of the second radar pulse, wherein the reflected pulse is reflected by an object
Data Source
AI summary
Some embodiments in the present disclosure relate to wireless sensing. A first radar pulse is transmitted and a second radar pulse is transmitted after the first radar pulse. A reflected pulse is received after the transmitting of the second radar pulse, wherein the reflected pulse is reflected by an object. A range of the object is obtained based on a temporal broadening of the reflected pulse.