A Method and Apparatus for Signal Reception with Ambient Light Compensation
Less complicated, cheaper and fasterCan be used at any time of day, not just at night
Free space optical communication
Photo detectors can be used to detect laser signals to support high-speed data communications for a variety of applications, such as for ground-to-air, air-to-air and other types of Unmanned Aerial Vehicle (UAV) communications, deep space communications, and underwater submersible communications. However, unwanted ambient light (or other noise signals) often causes the photo detector to saturate, causing an undesirable signal-to-noise (S/N) ratio. Saturation is generally not a problem during nighttime conditions, when ambient light levels are low. However, during daytime conditions, sunlight can produce a direct current (DC) photo current and cause the photo detector to saturate, making a desired communication signal (e.g., laser beam signal) undetectable. Moreover, in deep space application, sunlight and other atmospheric conditions can produce similar saturation problems. The inventors of this technology have developed a reliable method for solving this problem, developing a method and apparatus that reliably cancels existing ambient light and producing consistent laser communication between two entities.
Patent Number: US9154228B2
Application Number: US13652256A
Inventor: Faruque, Shams | Faruque, Saleh | Semke, William
Priority Date: 15 Oct 2012
Priority Number: US9154228B2
Application Date: 15 Oct 2012
Publication Date: 6 Oct 2015
IPC Current: G01J000144 | H04B001000 | H04B0010112
US Class: 1001
Assignee Applicant: University of North Dakota,Grand Forks | University of North Dakota,Grand Forks
Title: Method and apparatus for signal reception with ambient light compensation
Usefulness: Method and apparatus for signal reception with ambient light compensation
Summary: Apparatus for providing free space communication with compensation for ambient noise signals such as sunlight in communication system (claimed) for use with aerial vehicles such as unmanned aerial vehicles. Can also be used for providing communication with underwater submersible, purely land-based communication node such as automobile or building, deep space vehicle and/or satellite.
Novelty: Apparatus for providing free space communication in communication system for use with aerial vehicles, has receiving elements that are electrically connected in circuit to cancel portion of first current to produce output signal
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