Vehicle Antenna Beam Correction Using Independent Measurement Scans
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Solution Overview
Problem
Existing communication systems for moving vehicles, such as aircraft, face errors in antenna beam angle due to vehicle motion and installation misalignment, particularly affecting narrow beam communication standards like LTE or 5G NR, leading to reduced link quality and reliability.
Innovation Solution
An antenna system for moving vehicles comprising a main antenna and a measurement antenna, with control circuitry that adjusts the main beam by comparing signal metrics received by the measurement antenna at positions to either side of the initial bearing angle, allowing for precise correction of the main beam's bearing angle without interrupting communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If narrow beams are used for communication (LTE or 5G NR), then communication efficiency and bandwidth are improved, but the margin for error in directing the beam is reduced, leading to reduced reliability
Solution Approach 1:
The system employs a measurement antenna that continuously monitors signal metrics at positions to either side of the initial bearing angle. The control circuitry compares these metrics and determines corrections to apply to the main beam bearing angle, creating a closed-loop feedback system that maintains reliable communication with narrow beams by actively compensating for angular errors.
Solution Approach 2:
A measurement antenna is introduced as an intermediary element that does not carry out main communication but provides measurement signals used to determine corrections for the main beam. This intermediary allows the system to maintain narrow main beams for high efficiency while using the measurement antenna to detect and correct angular positioning errors.
2Stability of the object's composition
If vehicle motion compensation is implemented, then communication stability is improved, but system complexity increases due to multiple sensors and processing requirements
Solution Approach 1:
The measurement antenna performs self-service by autonomously measuring signal metrics at positions to either side of the bearing angle and providing comparison outputs that directly indicate the direction and magnitude of corrections needed. The control circuitry uses these outputs to automatically adjust the main beam bearing angle without requiring complex external intervention or multiple sensor types.
3Measurement precision
If installation alignment is improved, then initial bearing accuracy is improved, but manufacturing and installation complexity and cost increase
Solution Approach 1:
The system performs preliminary action by using the measurement antenna to measure signal metrics at positions to either side of the initial bearing angle before finalizing the main beam direction. The control circuitry determines corrections based on these preliminary measurements and applies them to the bearing angle, ensuring accurate beam direction without requiring extremely precise initial installation alignment.
Data Source
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AI summary
An antenna system for a moving vehicle, the antenna system comprising: a main antenna to generate a main beam; a measurement antenna to generate a measurement beam; and control circuitry to perform an adjustment process by: rotating the main beam to an initial bearing angle; rotating the measurement beam independently of the main beam to receive signals at positions to either side of the initial bearing angle; comparing at least one metric measured for the signals received by the measurement antenna at the positions to either side of the initial bearing angle to generate a comparison output; and determining, based on the comparison output, a correction to be applied to the initial bearing angle of the main beam.