Fiber Optic Radar Signal Transmission via Ethernet
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Solution Overview
Problem
Conventional aircraft weather radar systems face issues with signal loss and variability due to waveguide transmission, weight concerns, and susceptibility to electromagnetic interference and lightning, which degrade performance and cannot efficiently handle increased radar data requirements.
Innovation Solution
Implementing an Ethernet connection over a fiber optic cable link to digitize radar signals near the antenna and transmit them digitally, minimizing waveguide loss and variability, improving signal-to-noise ratio, and providing immunity to electromagnetic interference and lightning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If waveguide transmission is used to conduct signals from antenna to receiver, then signal transmission is achieved, but signal loss and variability increase
Solution Approach 1:
The patent replaces the waveguide transmission system with a fiber optic cable system. Instead of using metallic waveguides that conduct electromagnetic signals, the invention uses fiber optic cables to transmit digitized radar data electronically. This substitution eliminates the 2-5 dB signal loss and variability inherent in waveguide transmissions, as fiber optic cables do not suffer from the same electromagnetic interference and signal degradation issues.
Solution Approach 2:
The invention changes the fundamental parameter of signal transmission from analog electromagnetic wave propagation through waveguide to digital data transmission through fiber optic cable. By digitizing the radar signals near the antenna and transmitting them as digital data packets, the system transforms the transmission medium's characteristics, eliminating frequency-dependent loss and phase variability associated with waveguide systems.
2Adaptability or versatility
If waveguide length is increased to accommodate different aircraft installations, then adaptability is improved, but weight increases
Solution Approach 1:
The patent substitutes the heavy metallic waveguide structure with lightweight fiber optic cables. Fiber optic cables have significantly lower weight per unit length compared to rigid waveguide assemblies. This substitution allows the radar system to accommodate different aircraft installations with varying distances between antenna and electronic bay without incurring proportional weight increases, thereby improving adaptability while reducing overall installation weight.
3Reliability
If conventional waveguide transmission is used, then signal transmission is achieved, but susceptibility to EMI and lightning increases
Solution Approach 1:
The invention replaces the electrically conductive waveguide system with electrically isolated fiber optic transmission. Fiber optic cables are made of dielectric materials that do not conduct electricity, making them inherently immune to electromagnetic interference and lightning-induced voltage surges. This substitution dramatically improves signal transmission reliability by eliminating the primary pathways through which EMI and lightning could corrupt radar signals in conventional waveguide systems.
4Measurement precision
If radar data throughput is increased to improve weather detection capability, then measurement precision is improved, but signal loss becomes more significant
Solution Approach 1:
The invention changes the transmission parameter from analog signal strength to digital data integrity. By digitizing radar returns near the antenna and transmitting them as binary data packets over fiber optic cables, the system eliminates the cumulative signal loss that plagues analog waveguide transmissions. This allows for increased radar data throughput and improved weather detection precision without the penalty of exponential signal attenuation that would occur in extended waveguide systems.
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 solution significantly improves signal-to-noise ratio, reduces weight, and enhances the radar system's ability to handle increased data throughput while being more resistant to electromagnetic interference and lightning, leading to improved weather data accuracy and reliability for pilots.
Implementation Method 1
a fiber optic cable signal path to meet the increased radar throughput requirement. By digitizing the radar pulse pairs in high proximity to the antenna/receiver and replacing waveguide transmission of analog signals with fiber optic cable transmission of digital data
Implementation Method 2
The digital down-converter is adapted to convert the reflected radar signals received by the antenna into digital radar signals at a lower frequency
Data Source
AI summary
A weather radar signal path for an aircraft. The signal path has an antenna, a digital down-converter, a first transceiver, fiber optic cabling, a second transceiver and a processing unit. The antenna is adapted to, in a first mode, receive reflected radar signals from atmosphere ahead. The digital down-converter is adapted to convert the reflected radar signals received by the antenna into digital radar signals at a lower frequency. The first transceiver is adapted to, in the first mode, at least transmit the digital radar signals through said fiber optic cabling. The fiber optic cabling is adapted to, in the first mode, transfer the digital radar signals between the first and second transceivers. The second transceiver is adapted to, in the first mode, receive said digital radar signals from the fiber optic cabling. The processing unit is adapted to, in the first mode, process the digital radar signals to generate weather information based on predetermined algorithm.