PathFinder Digital https://www.pathfinderdigital.com Satellite Communications Wed, 05 Aug 2020 17:08:46 +0000 en-US hourly 1 https://wordpress.org/?v=5.4.2 https://s3.amazonaws.com/pathfinderdigital/wp-content/uploads/20200110112941/PFD_icon.png PathFinder Digital https://www.pathfinderdigital.com 32 32 Error Control Coding https://www.pathfinderdigital.com/error-control-coding https://www.pathfinderdigital.com/error-control-coding#respond Wed, 05 Aug 2020 17:08:46 +0000 https://www.pathfinderdigital.com/?p=932 Overview Error control coding (ECC) is the coding procedure done to control the occurrences of errors. These techniques help in Error Detection and Error Correction. There are many different error correcting codes depending upon the mathematical principles applied to them. [1] For free-space optics, ECC grants redundancy in laser uplink. The primary technique used for…

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Eye Safety https://www.pathfinderdigital.com/eye-safety https://www.pathfinderdigital.com/eye-safety#respond Mon, 27 Jul 2020 19:13:58 +0000 https://www.pathfinderdigital.com/?p=927 Overview Eye safety is a prominent topic for any optics technology. Since FSO products, especially in urban areas, will be directing laser beams into potentially populated areas, laser eye safety is a fundamental design concern. Although the damage threshold for ultraviolet light is much lower than it is for infrared, [1] infrared light is still…

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Smart Antennae https://www.pathfinderdigital.com/smart-antennae https://www.pathfinderdigital.com/smart-antennae#respond Thu, 23 Jul 2020 15:40:30 +0000 https://www.pathfinderdigital.com/?p=925 Overview Smart antennae are antenna arrays with smart processing algorithms and are used in identifying spatial signals. A smart antenna takes advantage of the diversity effect at either the source (transmitter), the destination (receiver), or both. The diversity effect increases data speed and reduces error by combining the transmission and/or reception of multiple radio frequency…

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FSO Overview and Key Terms https://www.pathfinderdigital.com/fso-overview-and-key-terms https://www.pathfinderdigital.com/fso-overview-and-key-terms#respond Mon, 13 Jul 2020 21:22:27 +0000 https://www.pathfinderdigital.com/?p=923 Overview Free-Space Optics (FSO) communication, also called free-space optical communication, is an optical communication technology that uses light propagating in free space to wirelessly send a signal. For example, using a flashlight and turning it off and on to send Morse code is FSO communication. Another example is using a laser rapidly turning off and…

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Interception Resistance https://www.pathfinderdigital.com/interception-resistance https://www.pathfinderdigital.com/interception-resistance#respond Fri, 10 Jul 2020 21:40:43 +0000 https://www.pathfinderdigital.com/?p=921 Overview FSO communications have built-in interception resistance due to the way information is sent. Consider first how a radio-frequency signal is sent. RF signals are broadcast over an area and are then funneled with point-to-point connections whereas FSO is exclusively point-to-point. Since RF is broadcast, an eavesdropper of an RF signal doesn’t sap much power…

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Space Development Agency (SDA) https://www.pathfinderdigital.com/space-development-agency-sda https://www.pathfinderdigital.com/space-development-agency-sda#respond Tue, 07 Jul 2020 14:32:15 +0000 https://www.pathfinderdigital.com/?p=919 The Space Development Agency (SDA) is a United States government entity that researches, develops, and fields next-generation technology for the United States’ Department of Defense’s National Defense Space Architecture. [1] The SDA was founded in March 2019 under the umbrella of the Undersecretary of Defense for Research and Engineering. The agency was designed to operate…

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Wavelength Division Multiplexing (WDM) https://www.pathfinderdigital.com/wavelength-division-multiplexing-wdm https://www.pathfinderdigital.com/wavelength-division-multiplexing-wdm#respond Thu, 02 Jul 2020 14:24:42 +0000 https://www.pathfinderdigital.com/?p=917 Overview Wavelength division multiplexing (WDM) is the combination of many optical signals into one transmission medium. Rather than sending a signal at 1550nm or 630nm, or sending both using two individual terminals, WDM enables the signals to be combined and sent using one transmitter. WDM is commonly used in fiber-optics and is an emerging technology…

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FSO Physical Limitations https://www.pathfinderdigital.com/fso-physical-limitations https://www.pathfinderdigital.com/fso-physical-limitations#respond Fri, 26 Jun 2020 20:15:45 +0000 https://www.pathfinderdigital.com/?p=915 Some FSO Limitations include the following: Obstructions Flying birds, trees, and tall buildings can temporarily block a single beam when it appears in line of sight (LOS) of transmission in an FSO system. Scintillation There can exist temperature variations in the free space between a transmitter and receiver in FSO communications; they manifest as pockets…

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Optical Inter-Satellite Links (OISL) https://www.pathfinderdigital.com/optical-inter-satellite-links-oisl https://www.pathfinderdigital.com/optical-inter-satellite-links-oisl#respond Tue, 23 Jun 2020 15:43:35 +0000 https://www.pathfinderdigital.com/?p=913 Overview Inter-Satellite Links (ISL) allow satellites to communicate with each other in a constellation.¬†Optical Inter-Satellite Links (OISL) are ISLs that utilize optical technologies to route data traffic between satellites and OGSs. OISLs have a greater advantage than traditional RF links since they are able to produce greater signal power with lighter and smaller components. OISLs…

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Optical Limitations https://www.pathfinderdigital.com/optical-limitations https://www.pathfinderdigital.com/optical-limitations#respond Fri, 19 Jun 2020 15:34:55 +0000 https://www.pathfinderdigital.com/?p=911 Absorption Absorption is caused by molecules suspended in the terrestrial atmosphere interacting with an incident photon and absorbing some or all of its energy. Absorption is strongly correlated to both the type of molecule present and the concentration of the molecule. Water, carbon dioxide, oxygen, and ozone molecules all absorb strongly in the infrared region.…

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