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Acquisition and tracking method and device for free light communication

A technology of optical communication and optical signal, applied in wireless communication, free space transmission, satellite communication transmission, etc., can solve expensive and high complexity problems

Active Publication Date: 2020-06-23
X DEV LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such acquisition and tracking systems for connected mobile communication terminals are expensive because of the high complexity required for mobile terminals

Method used

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  • Acquisition and tracking method and device for free light communication
  • Acquisition and tracking method and device for free light communication
  • Acquisition and tracking method and device for free light communication

Examples

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Embodiment Construction

[0028] refer to figure 1 , in some embodiments, a global-scale communication system (global-scale communication system) 100 includes fixed communication terminals 200 (eg, destination ground station 200a and source ground station 200b ) and satellites 301 . The fixed communication terminals 200 may communicate with each other, and in some examples, the fixed communication terminals 200 also function as link gateways between two or more satellites 301 . Destination ground station 200a may be a user terminal (eg, mobile device, residential WiFi device, home network, etc.), and source station 200b may be connected to one or more service providers. A fixed communication terminal 200 may receive a communication 20 from one of the satellites 301 and reroute the communication 20 to another communication terminal 200 . The system 100 may also include a high altitude platform (HAP), which includes aerial communication equipment operating at high altitudes (eg, 17-22 kilometers). For ...

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Abstract

The method (900) includes receiving a first optical signal (320, 320a) at a first communication terminal (302, 302a) from a second communication terminal (302, 302b) over a free space optical link (322), the received optical signal comprising modulating a unique frequency tone (318, 318a, 318b), the method further comprising mixing the modulated unique frequency tone with a reference signal (411) to provide a mixed output signal (413), and determining a value of the modulated unique frequency tone based on the mixed output signal Signal strength (415), the reference signal comprising the same frequency as the modulated unique frequency tone, the method adjusts the optical head (310, 310a, 310b) of the first communication terminal to based on the modulated unique frequency tone received from the second communication terminal signal strength to establish acquisition and beam pointing with the second communication terminal.

Description

technical field [0001] The invention relates to acquisition and tracking of free-space optical communication between communication terminals. Background technique [0002] Communication terminals can send and receive optical signals through free-space optical links. Communication terminals typically establish optical links by pointing light beams at each other using an acquisition and tracking system. For example, the transmitting terminal may use a beacon laser to illuminate the receiving terminal, and the receiving terminal may use a position sensor to locate the transmitting terminal to monitor the beacon laser. Additionally, the steering mechanism can steer the terminals to point toward each other, and track this pointing once acquisition is established. For communication terminals such as satellites or high-altitude communication devices that move freely relative to each other at high speed, a fast steering mirror or a fast gimbal is usually used as a steering mechani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04B10/118
CPCH04B10/116H04B10/118H04B10/1123H04B7/18513H04B10/112H04W72/0453
Inventor C.王S-H.杨R.克莱门特M.肖尔
Owner X DEV LLC
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