Optical Wireless Communication Reference Light Transmission
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Solution Overview
Problem
The challenge of maintaining stable optical wireless communication between moving optical wireless stations, such as from the Earth to the moon, due to atmospheric turbulence and positional changes, which causes signal light reception issues at the lunar station.
Innovation Solution
An optical wireless communication system that includes a reference light transmitting unit, an estimation unit, and a compensation unit, where the reference light is transmitted ahead of the signal light to account for the movement of the lunar station, allowing for compensation processing based on estimated atmospheric influences, ensuring stable signal light reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal light is transmitted after compensation processing based on reference light received at the current position, then atmospheric turbulence compensation is achieved, but the moving station has already moved from the transmission point making reception difficult
Solution Approach 1:
The patent applies preliminary action by transmitting the reference light in advance before the signal light. The reference light transmitting unit sends reference light toward the moving station at a position ahead of the current position, allowing the receiving station to observe atmospheric turbulence effects beforehand. This early observation enables compensation processing to be performed on the subsequent signal light, ensuring the compensated signal reaches the moving station at its expected position despite the time delay.
2Measurement precision
If reference light is transmitted from the current position, then the transmission point matches the current station position, but the station has moved by the time signal light arrives making compensation ineffective
Solution Approach 1:
The patent applies preliminary anti-action by proactively transmitting reference light to a position ahead of the moving station's current location. The reference light is directed toward where the station will be when the signal light arrives, not where it currently is. This anticipatory approach counteracts the positional displacement caused by the time delay, ensuring that the atmospheric turbulence observed from the reference light accurately reflects the conditions the signal light will encounter at the station's future position.
Data Source
AI summary
In an optical wireless communication system including: an optical wireless communication apparatus that moves along with a first optical wireless station; and a second optical wireless station opposed to the first optical wireless station, the optical wireless communication apparatus includes at least one reference light transmitting unit that transmits reference light to the second optical wireless station with a position in front in a moving direction of the first optical wireless station defined as a transmission position, the second optical wireless station includes a reference light receiving unit that receives the reference light transmitted from the at least one reference light transmitting unit, an estimation unit that estimates an influence of atmospheric air on transmission of signal light based on a reception state of the reference light received by the reference light receiving unit, a compensation unit that performs compensation processing on the signal light based on the influence of the atmospheric air estimated by the estimation unit, and a signal light transmitting unit that transmits the signal light on which the compensation processing has been performed by the compensation unit in an arrival direction of the reference light.