Phased Array Antennas for Autonomous Robot RF Navigation
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Solution Overview
Problem
Autonomous mobile robots face challenges in navigating indoor environments due to obstacles at various altitudes and RF signal loss, especially when operating around untrained personnel or in environments that inhibit RF propagation, leading to inefficiencies in RF reception from sensors.
Innovation Solution
Employing phased array antennas integrated into the robot's structure, which provide high gain wireless communication and enable obstacle avoidance, allowing for improved RF reception and navigation through environments with RF enclosures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antennas are used in autonomous robots, then the device complexity and cost are reduced, but the RF reception capability deteriorates in environments with signal loss
Solution Approach 1:
The antenna system is divided into multiple antenna elements arranged in a phased array configuration. Each element can be independently controlled to adjust the beam direction and shape, enabling the system to achieve high gain and directional communication without requiring a single large complex antenna structure.
Solution Approach 2:
The phased array antenna employs dynamic beam steering capability through electronic phase shifting of signals across different antenna elements. This allows the antenna to dynamically adjust its radiation pattern and main lobe direction without mechanical movement, providing adaptive RF reception capability in varying environmental conditions.
2Reliability
If high gain antennas are used to improve RF reception, then the successfully received data percentage increases, but the manufacturing cost and complexity increase significantly
Solution Approach 1:
The high gain functionality is achieved by segmenting the antenna into multiple smaller elements that can be manufactured using standard PCB techniques. These individual elements are then arranged in a phased array configuration, allowing the system to achieve high gain through constructive interference rather than requiring a single large expensive antenna element.
Solution Approach 2:
The system achieves high gain by changing the electrical parameters (phase and amplitude) of signals fed to different antenna elements rather than changing the physical size of individual elements. This allows standard-sized antenna elements to collectively provide high gain through phased array beam forming techniques.
3Adaptability or versatility
If remote beacon sensors are used for navigation, then the robot can operate in confined spaces, but the RF signal loss increases due to distance and environmental obstacles
Solution Approach 1:
The phased array antenna provides dynamic beam steering capability that allows it to adaptively track and focus RF energy toward moving beacon sensors as the robot navigates through confined spaces. This dynamic adjustment compensates for changing distances and orientations, maintaining strong signal reception despite environmental obstacles.
Solution Approach 2:
The phased array antenna concentrates RF energy in a specific directional beam toward the beacon sensor rather than radiating uniformly in all directions. This localized energy concentration improves signal strength at the target location while reducing overall energy loss, enabling reliable communication in confined spaces with obstacles.
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 phased array antennas enhance RF communication, enabling precise navigation and data collection from sensors, reducing operational time and cost while maintaining low weight and power consumption.
Implementation Method 1
phased array antennas enable wireless communication between on-board features of the mobile robot and off-board sensors
Data Source
Figure 1
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Figure 3A~3B
AI summary
An apparatus, system and method of operating an autonomous mobile robot having a height of at least one meter. The apparatus, system and method may include a mobile robot body; at least two phased array antennas associated with the mobile body, wherein the phased array antennas enable wireless communication between on-board features of the mobile robot, including at least mobility hardware proximate to a base of the mobile robot body, and off-board sensors related to at least navigation of the mobility hardware; and a processing system communicative with the on-board features and the off-board sensors via intercommunication with the phased antennas, and comprising non-transitory computing code which, when executed by at least one processor associated with the processing system.