Automatic RF Cable Loss Compensation in Aircraft
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Solution Overview
Problem
Existing RF cable compensation systems in aircraft and other applications require manual adjustment of attenuators, leading to increased weight, installation time, reduced reliability, and complex maintenance due to variability in aircraft size and configuration, necessitating a solution for automatic and standardized cable loss compensation.
Innovation Solution
An apparatus and method that utilize a signal source to send a test signal through the RF communication link, measure its strength, and automatically adjust an electronically variable attenuator to achieve a predetermined total signal loss, eliminating the need for manual adjustments and ensuring consistent performance across different installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual attenuators are used to compensate for cable loss variations, then cable loss compensation can be achieved, but weight increases, installation time increases, and reliability decreases
Solution Approach 1:
The system performs self-diagnosis and self-adjustment by automatically measuring cable loss through test signals and adjusting the electronically variable attenuator without manual intervention, eliminating the need for technicians to physically adjust attenuators during installation and maintenance
Solution Approach 2:
The patent replaces manual mechanical attenuator adjustment with an electronically variable attenuator controlled by a processor that automatically measures cable loss and adjusts attenuation levels through electronic control signals, eliminating mechanical adjustment operations
2Manufacturing precision
If fixed attenuators are installed to meet cable loss specifications, then signal loss can be controlled, but device complexity increases and maintenance becomes more difficult
Solution Approach 1:
The system uses an electronically variable attenuator that can dynamically adjust its attenuation level based on measured cable loss, replacing fixed attenuators with varying attenuation values and enabling a single standardized configuration to adapt to different cable conditions
Solution Approach 2:
The processor measures cable loss parameters and automatically adjusts the attenuator's electrical parameters (attenuation level) to achieve the desired total signal loss, eliminating the need for different physical attenuator configurations
3Reliability
If additional attenuators and custom components are added to accommodate installation variability, then cable loss can be compensated, but weight increases and installation time increases
Solution Approach 1:
The system automatically measures cable loss and adjusts the electronically variable attenuator without requiring manual measurement or adjustment during installation, significantly reducing installation time while maintaining compensation accuracy
Solution Approach 2:
A single standardized system with an electronically variable attenuator replaces multiple fixed attenuators and custom components, providing universal compatibility across different aircraft configurations and eliminating the need for installation-specific hardware variations
Data Source
AI summary
Method and apparatus are provided for compensation of an RF link between a transmitter and amplifier of a communication system. The apparatus comprises a signal source coupled to the transmitter for providing an RF test signal of a first magnitude to the RF link, a test signal measuring apparatus at the RF input of the amplifier for measuring a second magnitude of the test signal reaching the RF input of the amplifier through the RF link, and an electronically adjustable attenuator serially coupled with the RF link and responsive to differences between the first and second magnitudes so as to provide attenuation in an RF communication signal passing into the amplifier from the RF link such that the sum of RF signal loss in the link and the attenuator has a predetermined value.