Spatial Light Communication Control for Oscillation Compensation
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Solution Overview
Problem
Existing optical space communication systems fail to maintain stable communication due to oscillations of communication apparatuses, which cannot be accurately accounted for using only position information from GPS or navigation systems.
Innovation Solution
A communication apparatus equipped with a transmitter, receiver, detector, and communication control unit that analyzes oscillation states of both the apparatus and communication target, adjusting transmission conditions to compensate for oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If position information from GPS or navigation systems is used to generate phase images, then communication can be maintained according to changes in relative positions, but communication interruption occurs due to oscillations of communication apparatuses that cannot be grasped from position information alone
Solution Approach 1:
The patent introduces an intermediary measurement system (detector, accelerometer, gyroscope, or camera) that directly measures oscillation of the communication apparatus. This intermediary provides additional oscillation information that complements the GPS position data, enabling the system to detect and compensate for oscillations that position information alone cannot capture, thereby maintaining communication reliability
Solution Approach 2:
The patent implements feedback by using detected oscillation information (from both position changes and direct oscillation measurements) to dynamically adjust the phase image and transmission direction. The communication control unit continuously updates the phase modulation based on real-time oscillation data, creating a closed-loop system that actively compensates for oscillations to maintain stable communication
2Reliability
If transmission direction is fixed based on initial position alignment, then system complexity is reduced, but communication is interrupted when oscillations change the relative positions and postures of apparatuses
Solution Approach 1:
The patent makes the transmission system dynamic by continuously adjusting the phase image and transmission direction based on real-time oscillation detection. Instead of a fixed transmission direction, the system dynamically adapts the beam direction and phase modulation to track the communication target despite oscillations, ensuring communication continuity while managing complexity through software-based control
3Measurement precision
If phase images are generated solely from position information, then the system is simpler to implement, but it cannot accurately compensate for oscillations that cause communication interruption
Solution Approach 1:
The patent introduces intermediary detection devices (accelerometers, gyroscopes, cameras) that directly measure oscillation parameters. These intermediaries provide high-precision oscillation data (acceleration, angular velocity, position) that complements GPS position information, enabling accurate oscillation state measurement without requiring an overly complex detection system
Solution Approach 2:
The patent segments the measurement function into multiple specialized detectors, each optimized for specific measurements (position from GPS, acceleration from accelerometer, angular velocity from gyroscope, or position from camera). This segmentation allows each component to be relatively simple while the combined system achieves comprehensive and accurate oscillation measurement
Data Source
AI summary
A communication apparatus including a transmitter that transmits modulated light modulated by a modulation part of a spatial light modulator as a first spatial light signal, a receiver that receives a second spatial light signal transmitted from a communication target, a detector that detects a physical quantity related to oscillation of the own apparatus, and a communication control unit that acquires the physical quantity detected by the detector and information on oscillation of the communication target included in the second spatial light signal, analyzes a state of the oscillation of the communication target using the information on the oscillation of the communication target and the physical quantity, and sets a transmission condition of the first spatial light signal in the transmitter according to the analyzed state of the oscillation of the communication target.