%
% Glossary.tex
%
% SatNOGS Optical Unofficial Guide
%
% Copyright (C) 2022, Jeff Moe
%
% This document is licensed under the Creative Commons Attribution 4.0
% International Public License (CC BY-SA 4.0) by Jeff Moe.
%

%%%%%%%%%%%
% ACRONYM %
%%%%%%%%%%%
\newacronym[
	description={Instrument Neutral Distributed Interface is a \gls{DCS} protocol to enable control, data acquisition and exchange among hardware devices and software front ends, emphasizing astronomical instrumentation.%
	\footnote{\cite{enwiki:Instrument-Neutral-Distributed-Interface}}%
		}]
{INDI}{INDI}{Instrument Neutral Distributed Interface}

\newacronym[
	description={Debian Free Software Guidelines is a set of guidelines that the \gls{Debian} Project uses to determine whether a software license is a free software license, which in turn is used to determine whether a piece of software can be included in \gls{Debian}. The DFSG is part of the \gls{Debian} Social Contract.%
	\footnote{\cite{enwiki:Debian-Free-Software-Guidelines}}%
		}]
{DFSG}{DFSG}{Debian Free Software Guidelines}

\newacronym[
	description={Flexible Image Transport System is an open standard defining a digital file format useful for storage, transmission and processing of data: formatted as multi-dimensional arrays (for example a 2D image), or tables. FITS is the most commonly used digital file format in astronomy. The FITS standard was designed specifically for astronomical data, and includes provisions such as describing photometric and spatial calibration information, together with image origin metadata.%
	\footnote{\cite{Wiki22:fitswikipfreeencyc}}%
		}]
{FITS}{FITS}{Flexible Image Transport System}

\newacronym[
	description={Software-defined radio is a radio communication system where components that have been traditionally implemented in analog hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a personal computer or embedded system. SDRs are used in \gls{SatNOGS} \glspl{ground-station}.%
			\footnote{\cite{Wiki22:softwdefinradiowikipfreeencyc}}
		}]
{SDR}{SDR}{Software-defined radio}

\newacronym[
	description={Libre Space Foundation is a non-profit foundation registered since 2015 in Greece and the creators of the SatNOGS project.%
			\footnote{\url{https://libre.space/about-us/}}
		}]
{LSF}{LSF}{Libre Space Foundation}

\newacronym[
	description={Radio frequency is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around 20 \gls{kHz} to around 300 \gls{GHz}. This is roughly between the upper limit of audio frequencies and the lower limit of infrared frequencies; these are the frequencies at which energy from an oscillating current can radiate off a conductor into space as radio waves.%
			\footnote{\cite{Wiki22:radiofrequwikipfreeencyc}}
		}]
{RF}{RF}{radio frequency}

\newacronym[
	description={Very High Frequency is the \gls{ITU} designation for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 \gls{MHz}, with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as \gls{UHF}.%
			\footnote{\cite{Wiki22:veryhighfrequwikipfreeencyc}}
		}]
{VHF}{VHF}{Very High Frequency}

\newacronym[
	description={Ultra High Frequency is the \gls{ITU} designation for radio frequencies in the range between 300 \gls{MHz} and 3 \gls{GHz}, also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (one decimeter). Lower frequency signals fall into the \gls{VHF} or lower bands.%
			\footnote{\cite{Wiki22:ultrahighfrequwikipfreeencyc}}
		}]
{UHF}{UHF}{Ultra High Frequency}

\newacronym[
	description={The International Telecommunication Union is a specialized agency of the United Nations responsible for many matters related to information and communication technologies.%
			\footnote{\cite{Wiki22:intertelecunionwikipfreeencyc}}
		}]
{ITU}{ITU}{International Telecommunication Union}

\newacronym[
	description={``GNU's Not Unix!'' is an extensive collection of \gls{free-software}, which can be used as an operating system or can be used in parts with other operating systems. The use of the completed GNU tools led to the family of operating systems popularly known as \gls{Linux}. Most of GNU is licensed under the GNU Project's own \gls{GPL}. GNU is also the project within which the \gls{free-software} concept originated.%
			\footnote{\cite{Wiki22:gnuwikipfreeencyc}}
		}]
{GNU}{GNU}{GNU's Not Unix!}

\newacronym[
	description={GNU General Public License is a series of widely used \gls{free-software} licenses that guarantee end users the four freedoms to run, study, share, and modify the software. The license was the first copyleft for general use. Historically, the GPL license family has been one of the most popular software licenses in the \gls{FLOSS} software domain.%
			\footnote{\cite{Wiki22:gnugenerpublilicenwikipfreeencyc}}
		}]
{GPL}{GPL}{GNU General Public License}

\newacronym[
	description={Simplified General Perturbations models apply to near earth objects with an orbital period of less than 225 minutes. Simplified \glspl{perturbation} models are a set of five mathematical models (SGP, SGP4, SDP4, SGP8 and SDP8) used to calculate orbital state vectors of \glspl{satellite} and space debris relative to the Earth-centered inertial coordinate system. This set of models is often referred to collectively as SGP4 due to the frequency of use of that model particularly with \gls{TLE} sets produced by \gls{NORAD} and \gls{NASA}. These models predict the effect of \glspl{perturbation} caused by the Earth's shape, drag, radiation, and gravitation effects from other bodies such as the sun and moon. See also: \gls{SDP}.%
			\footnote{\cite{enwiki:Simplified_perturbations_models}}
		}]
{SGP}{SGP}{Simplified General Perturbations}

\newacronym[
	description={Simplified Deep Space Perturbations models apply to objects with an orbital period greater than 225 minutes, which corresponds to an altitude of 5,877.5 km, assuming a circular orbit. See also: \gls{SGP}.%
			\footnote{\cite{enwiki:Simplified_perturbations_models}}
		}]
{SDP}{SDP}{Simplified Deep Space Perturbations}

\newacronym[
	description={North American Aerospace Defense Command is a combined organization of the United States and Canada that provides aerospace warning, air sovereignty, and protection for Canada and the continental United States.%
			\footnote{\cite{enwiki:NORAD}}
		}]
{NORAD}{NORAD}{North American Aerospace Defense Command}

\newacronym[
	description={is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research.%
			\footnote{\cite{enwiki:NASA}}
		}]
{NASA}{NASA}{National Aeronautics and Space Administration}

\newacronym[
	description={open-source hardware consists of physical artifacts of technology designed and offered by the open-design movement. Both \gls{FOSS} and open-source hardware are created by the open-source culture movement and apply a like concept to a variety of components. It is sometimes, thus, referred to as \gls{FOSH}. The term usually means that information about the hardware is easily discerned so that others can make it---coupling it closely to the maker movement. Hardware design (i.e. mechanical drawings, schematics, bills of material, PCB layout data, HDL source code and integrated circuit layout data), in addition to the software that drives the hardware, are all released under free/libre terms. The original sharer gains feedback and potentially improvements on the design from the \gls{FOSH} community. There is now significant evidence that such sharing can drive a high return on investment for the scientific community. It is not enough to merely use an open-source license; an open source product or project will follow open source principles, such as modular design and community collaboration.%
			\footnote{\cite{enwiki:Open-source-hardware}}
		}]
{OSH}{OSH}{open-source hardware}

\newacronym[
	description={free and open-source software is a term used to refer to groups of software consisting of both \gls{free-software} and \gls{OSS} where anyone is freely licensed to use, copy, study, and change the software in any way, and the source code is openly shared so that people are encouraged to voluntarily improve the design of the software. This is in contrast to proprietary software, where the software is under restrictive copyright licensing and the source code is usually hidden from the users. FOSS maintains the software user's civil liberty rights. Other benefits of using FOSS can include decreased software costs, increased security and stability (especially in regard to malware), protecting privacy, education, and giving users more control over their own hardware. Free and open-source operating systems such as \gls{Linux} and descendants of BSD are widely utilized today, powering millions of servers, desktops, smartphones (e.g., Android), and other devices. Free-software licenses and open-source licenses are used by many software packages. The free software movement and the open-source software movement are online social movements behind widespread production and adoption of FOSS, with the former preferring to use the terms \gls{FLOSS} or free/libre.%
			\footnote{\cite{enwiki:Free-and-open-source-software}}
		}]
{FOSS}{FOSS}{free and open-source software}

\newacronym[
	description={open-source software is computer software that is released under a license in which the copyright holder grants users the rights to use, study, change, and distribute the software and its source code to anyone and for any purpose. Open-source software may be developed in a collaborative public manner. Open-source software is a prominent example of open collaboration, meaning any capable user is able to participate online in development, making the number of possible contributors indefinite. The ability to examine the code facilitates public trust in the software. Open source code can be used for studying and allows capable end users to adapt software to their personal needs in a similar way user scripts and custom style sheets allow for web sites, and eventually publish the modification as a fork for users with similar preference.%
			\footnote{\cite{enwiki:Open-source-software}}
		}]
{OSS}{OSS}{open-source software}

%%%
% Acronyms without citations.
%%%
\newacronym[description={hertz.}]{Hz}{Hz}{hertz}
\newacronym[description={kilohertz.}]{kHz}{kHz}{kilohertz}
\newacronym[description={megahertz.}]{MHz}{MHz}{megahertz}
\newacronym[description={gigahertz.}]{GHz}{GHz}{gigahertz}
\newacronym[description={digital single-lens reflex.}]{DSLR}{DSLR}{digital single-lens reflex}
\newacronym[description={Power over Ethernet.}]{PoE}{PoE}{Power over Ethernet}
\newacronym[description={Global Navigation \Gls{satellite} System.}]{GNSS}{GNSS}{Global Navigation Satellite System}
\newacronym[description={Global Positioning System.}]{GPS}{GPS}{Global Positioning System}
\newacronym[description={Ingress Protection code 67.}]{IP67}{IP67}{Ingress Protection code 67}
\newacronym[description={Space Situational Awareness.}]{SSA}{SSA}{Space Situational Awareness}
\newacronym[description={World Coordinate System.}]{WCS}{WCS}{World Coordinate System}
\newacronym[description={Complementary metal-oxide-semiconductor (pronounced ``see-moss'').}]{CMOS}{CMOS}{Complementary metal–oxide–semiconductor}
\newacronym[description={charge-coupled device.}]{CCD}{CCD}{charge-coupled device}
\newacronym[description={Spacecraft Identification and Localization.}]{SIDLOC}{SIDLOC}{Spacecraft Identification and Localization}
\newacronym[description={Rowe-Ackermann Schmidt \Gls{astrograph}.}]{RASA}{RASA}{Rowe-Ackermann Schmidt Astrograph}
\newacronym[description={Commodity off the shelf.}]{COTS}{COTS}{Commodity off the shelf}
\newacronym[description={Free open-source hardware. See also: \gls{OSH}.}]{FOSH}{FOSH}{Free open-source hardware}
\newacronym[description={Free/libre and open-source software. See also: \gls{FOSS}.}]{FLOSS}{FLOSS}{Free/libre and open-source software}
\newacronym[description={Simple Imaging Polynomial.}]{SIP}{SIP}{Simple Imaging Polynomial}
\newacronym[description={Field of view.}]{FOV}{FOV}{Field of View}
\newacronym[description={distributed control system.}]{DCS}{DCS}{distributed control system}
\newacronym[description={Portable Network Graphics.}]{PNG}{PNG}{Portable Network Graphics}
\newacronym[description={Comma Separated Value.}]{CSV}{CSV}{Comma Separated Value}
\newacronym[description={Network Time Protocol.}]{NTP}{NTP}{Network Time Protocol}
\newacronym[description={Internet Protocol.}]{IP}{IP}{Internet Protocol}
\newacronym[description={International Space Station.}]{ISS}{ISS}{International Space Station}
\newacronym[description={Low Earth Orbit.}]{LEO}{LEO}{Low Earth Orbit}
\newacronym[description={Geostationary orbit.}]{GEO}{GEO}{Geostationary orbit}
\newacronym[description={High Earth orbit.}]{HEO}{HEO}{High Earth orbit}
\newacronym[description={Medium Earth orbit.}]{MEO}{MEO}{Medium Earth orbit}
\newacronym[description={Geosynchronous orbit.}]{GSO}{GSO}{Geosynchronous orbit}
\newacronym[description={Printed circuit coard.}]{PCB}{PCB}{Printed Circuit Board}
\newacronym[description={Hardware description language.}]{HDL}{HDL}{Hardware description lanuage}
\newacronym[description={Video for Linux v2.}]{V4L2}{V4L2}{Video for Linux v2}
\newacronym[description={Berkeley Software Distribution.}]{BSD}{BSD}{Berkeley Software Distribution}
\newacronym[description={Software development kit.}]{SDK}{SDK}{Software development kit}
\newacronym[description={Mobile Industry Processor Interface.}]{MIPI}{MIPI}{Mobile Industry Processor Interface}
\newacronym[description={All Sky Monitor.}]{ASM}{ASM}{All Sky Monitor}
\newacronym[description={Pan-tilt-zoom.}]{PTZ}{PTZ}{Pan-tilt-zoom}
\newacronym[description={Pulse per second.}]{PPS}{PPS}{Pulse per second}


%%%%%%%%%%%
% Acronyms with citations
%%%%%%%%%%%

\newacronym[
	description={The International System of Units, known by the international abbreviation SI in all languages and sometimes pleonastically as the SI system, is the modern form of the metric system and the world's most widely used system of measurement. Established and maintained by the General Conference on Weights and Measures (CGPM), it is the only system of measurement with an official status in nearly every country in the world, employed in science, technology, industry, and everyday commerce.%
			\footnote{\cite{Wiki22:intersysteunitswikipfreeencyc}}
		}]
{SI}{SI}{International System of Units}

\newacronym[
	description={a simple two-axis mount for supporting and rotating an instrument about two perpendicular axes -- one vertical and the other horizontal. Rotation about the vertical axis varies the azimuth (compass bearing) of the pointing direction of the instrument. Rotation about the horizontal axis varies the altitude angle (angle of elevation) of the pointing direction. These mounts are used, for example, with telescopes, cameras, and radio antennas.%
			\footnote{\cite{Wiki21:altazmountwikipfreeencyc}}
		}]
{Alt-Az}{Alt/Az mount}{Altazimuth mount}

\newacronym[
	description={two-line element set is a data format encoding a list of orbital elements of an Earth-orbiting object for a given point in time, the epoch. Using a suitable prediction formula, the state (position and velocity) at any point in the past or future can be estimated to some accuracy. TLEs can describe the trajectories only of Earth-orbiting objects. TLEs are widely used as input for projecting the future orbital tracks of space debris for purposes of characterizing ``future debris events to support risk analysis, close approach analysis, collision avoidance maneuvering'' and forensic analysis. The format was originally intended for punched cards, encoding a set of elements on two standard 80-column cards.%
			\footnote{\cite{Wiki22:twolineelemesetwikipfreeencyc}}
		}]
{TLE}{TLE}{two-line element set}

%%%%%%%%%%%%
% GLOSSARY %
%%%%%%%%%%%%

%%%%%%%%%%%%
% Glossary entries without citations that are not acronyms.
%%%%%%%%%%%%

\newglossaryentry{artificial satellite}
{ name={artificial satellite},
	description={is a \gls{satellite} put into \gls{orbit} by humans, not ``naturally'' occurring.}}

\newglossaryentry{libre-software}
{ name={libre software},
	description={See: \gls{free-software}.}}


%%%%%%%%%%%%
% Glossary entries with footnotes that are not acronyms.
%%%%%%%%%%%%
\newglossaryentry{AstroImageJ}
{ name={AstroImageJ},
	description={Application for astronomy and \gls{satellite} image analysis.%
			\footnote{\url{https://www.astro.louisville.edu/software/astroimagej/}}
		}}

\newglossaryentry{skymap}
{ name={skymap},
	description={is part of \gls{sattools}. Visualize \glspl{satellite} on a map of the sky.%
			\footnote{\url{https://github.com/cbassa/sattools/blob/master/skymap.c}}
		}}

\newglossaryentry{satid}
{ name={satid},
	description={is part of \gls{sattools}.%
			\footnote{\url{https://github.com/cbassa/sattools/blob/master/satid.c}}
		}}

\newglossaryentry{sattools}
{ name={sattools},
	description={Satellite Tracking Toolkit. The main \texttt{sattools} applications are being ported to \gls{stvid} and other related \gls{Python} applications.%
			\footnote{\url{https://github.com/cbassa/sattools}}
		}}

\newglossaryentry{satpredict}
{ name={satpredict},
	description={is a software application to compute \gls{satellite} predictions. It is used by \gls{stvid}.%
			\footnote{\url{https://github.com/cbassa/satpredict}}
		}}

\newglossaryentry{stvid}
{ name={stvid},
	description={\Gls{satellite} tools video application for acquiring and processing sky images.%
			\footnote{\url{https://github.com/cbassa/stvid}}
		}}

\newglossaryentry{hough3d-code}
{ name={hough3d-code},
	description={is a software application for Iterative Hough Transform for Line Detection in 3D Point Clouds.%
			\footnote{\url{https://gitlab.com/pierros/hough3d-code}}
		}}

\newglossaryentry{ground-station}
{ name={ground station},
	description={a setup of equipment such as computers, cameras, \glspl{SDR}, antennas, and receivers, located on Earth, observing space.
		}}

\newglossaryentry{SatNOGS-Optical}
{ name={SatNOGS Optical},
	description={is a project by the \gls{LSF} to add optical ground stations to the SatNOGS network.%
			\footnote{\url{https://satnogs.org/}}
		}}

\newglossaryentry{SatNOGS DB}
{ name={SatNOGS DB},
	description={is an effort to create an hollistic, unified, global database for all artificial objects in space (\glspl{satellite} and spacecrafts). Users can view and export the data, contribute to it, or connect applications using an API. It is part of the \gls{SatNOGS} project.%
			\footnote{\url{https://db.satnogs.org/}}
		}}

\newglossaryentry{SatNOGS}
{ name={SatNOGS},
	description={Open Source global network of \gls{satellite} ground stations.%
			\footnote{\url{https://satnogs.org/}}
		}}

\newglossaryentry{optical-ground-station}
{ name={optical ground station},
	description={a ground station using optical equipment (cameras) instead of antennas.
		}}

\newglossaryentry{antenna}
{ name={antenna},
	description={the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver.%
			\footnote{\cite{Wiki22:antenradiowikipfreeencyc}}
		}}

\newglossaryentry{mast}
{ name={mast},
	description={typically tall structures designed to support antennas for telecommunications and broadcasting.%
			\footnote{\cite{Wiki22:radiomaststowerwikipfreeencyc}}
		}}

\newglossaryentry{rotator}
{ name={rotator},
	description={a device used to change the orientation, within the horizontal plane, of a directional antenna. Most antenna rotators have two parts, the rotator unit and the controller. The controller is normally placed near the equipment which the antenna is connected to, while the rotator is mounted on the antenna mast directly below the antenna. Rotators are commonly used in amateur radio.%
			\footnote{\cite{Wiki22:antenrotatwikipfreeencyc}}
		}}

\newglossaryentry{Debian}
{ name={Debian},
	description={a \gls{GNU}/\gls{Linux} distribution composed of free and open-source software, developed by the community-supported Debian Project, which was established by Ian Murdock on August 16, 1993. Debian is the basis for many other distributions, notably Ubuntu.
			Debian is one of the oldest operating systems based on the Linux kernel.%
			\footnote{\cite{Wiki22:debiawikipfreeencyc}}
		}}

\newglossaryentry{Linux}
{ name={Linux},
	description={is a free and open-source, monolithic, modular, multitasking, Unix-like operating system kernel. It was originally authored in 1991 by Linus Torvalds for his i386-based PC, and it was soon adopted as the kernel for the \gls{GNU} operating system, which was written to be a free (libre) replacement for Unix.%
			\footnote{\cite{Wiki22:linuxkernewikipfreeencyc}}
		}}

\newglossaryentry{open-source}
{ name={Open Source},
	description={is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. The open-source model is a decentralized software development model that encourages open collaboration. A main principle of open-source software development is peer production, with products such as source code, blueprints, and documentation freely available to the public. The open-source movement in software began as a response to the limitations of proprietary code. The model is used for projects such as in open-source appropriate technology.%
			\footnote{\cite{Wiki22:opensourcwikipfreeencyc}}
		}}

\newglossaryentry{free-software}
{ name={Free Software},
	description={or libre software, is computer software distributed under terms that allow users to run the software for any purpose as well as to study, change, and distribute it and any adapted versions. Free software is a matter of liberty, not price; all users are legally free to do what they want with their copies of a free software (including profiting from them) regardless of how much is paid to obtain the program. Computer programs are deemed ``free'' if they give end-users (not just the developer) ultimate control over the software and, subsequently, over their devices.%
			\footnote{\cite{Wiki22:freesoftwwikipfreeencyc}}
		}}

\newglossaryentry{Matrix}
{ name={Matrix},
	description={an open standard and communication protocol for real-time communication.%
			\footnote{\cite{Wiki22:matriprotowikipfreeencyc}}
		}}

\newglossaryentry{telescope}
{ name={telescope},
	description={is an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects, or various devices used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. The word telescope now refers to a wide range of instruments capable of detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors.%
			\footnote{\cite{enwiki:Telescope}}
		}}

\newglossaryentry{astrograph}
{ name={astrograph},
	description={is a telescope designed for the sole purpose of astrophotography. Astrographs are mostly used in wide-field astronomical surveys of the sky and for detection of objects such as asteroids, meteors, and comets.%
			\footnote{\cite{enwiki:Astrograph}}
		}}

\newglossaryentry{satellite}
{ name={satellite},
	description={is an object intentionally placed into \gls{orbit} in outer space. Except for passive satellites, most satellites have an electricity generation system for equipment on board. Most satellites also have a method of communication to ground stations, called transponders. Many satellites use a standardized bus to save cost and work, the most popular of which is small \Glspl{cubesat}. Similar satellites can work together as a group, forming constellations.%
			\footnote{\cite{enwiki:Satellite}}
		}}

\newglossaryentry{cubesat}
{ name={CubeSat},
	description={is a class of miniaturized \gls{satellite} based around a form factor consisting of 10 cm (3.9 in) cubes. CubeSats have a mass of no more than 2 kg (4.4 lb) per unit, and often use \gls{COTS} components for their electronics and structure. CubeSats are put into \gls{orbit} by deployers on the International Space Station, or launched as secondary payloads on a launch vehicle. More than a thousand CubeSats have been launched.%
			\footnote{\cite{enwiki:CubeSat}}
		}}

\newglossaryentry{orbit}
{ name={orbit},
	description={is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such as a planet, moon, asteroid, or Lagrange point. Normally, orbit refers to a regularly repeating trajectory, although it may also refer to a non-repeating trajectory. To a close approximation, planets and \glspl{satellite} follow elliptic orbits, with the center of mass being orbited at a focal point of the ellipse, as described by Kepler's laws of planetary motion. For most situations, orbital motion is adequately approximated by Newtonian mechanics, which explains gravity as a force obeying an inverse-square law. However, Albert Einstein's general theory of relativity, which accounts for gravity as due to curvature of spacetime, with orbits following geodesics, provides a more accurate calculation and understanding of the exact mechanics of orbital motion.%
			\footnote{\cite{enwiki:Orbit}}
		}}

\newglossaryentry{perturbation}
{ name={perturbation},
	description={is the complex motion of a massive body subjected to forces other than the gravitational attraction of a single other massive body. The other forces can include a third (fourth, fifth, etc.) body, resistance, as from an atmosphere, and the off-center attraction of an oblate or otherwise misshapen body.%
			\footnote{\cite{enwiki:Perturbation-astronomy}}
		}}

\newglossaryentry{telemetry}
{ name={telemetry},
	description={is the in situ collection of measurements or other data at remote points and their automatic transmission to receiving equipment (telecommunication) for monitoring. The word is derived from the Greek roots tele, ``remote'', and metron, ``measure''. Although the term commonly refers to wireless data transfer mechanisms (e.g., using radio, ultrasonic, or infrared systems), it also encompasses data transferred over other media such as a telephone or computer network, optical link or other wired communications like power line carriers.%
			\footnote{\cite{enwiki:Telemetry}}
		}}

\newglossaryentry{Grafana}
{ name={Grafana},
	description={is a multi-platform \gls{open-source} analytics and interactive visualization web application. It provides charts, graphs, and alerts for the web when connected to supported data sources. Users can create complex monitoring dashboards using interactive query builders. It is used by the \gls{SatNOGS} project to visualize \gls{satellite} \gls{telemetry}.%
			\footnote{\cite{enwiki:Grafana}}
		}}

\newglossaryentry{Python}
{ name={Python},
	description={is a high-level, interpreted, general-purpose programming language. Its design philosophy emphasizes code readability. It is often described as a ``batteries included'' language due to its comprehensive standard library. Python consistently ranks as one of the most popular programming languages. It is one of the main languages of the \gls{SatNOGS} project and \gls{stvid}.%
			\footnote{\cite{enwiki:Python-language}}
		}}

\newglossaryentry{C}
{ name={C},
	description={is a general-purpose computer programming language. It was created in the 1970s by Dennis Ritchie, and remains very widely used and influential. By design, C's features cleanly reflect the capabilities of the targeted CPUs. It has found lasting use in operating systems, device drivers, protocol stacks, though decreasingly for application software. C is commonly used on computer architectures that range from the largest supercomputers to the smallest microcontrollers and embedded systems. C is used in the \gls{sattools} suite of applications.%
			\footnote{\cite{enwiki:C-language}}
		}}

\newglossaryentry{libre}
{ name={libre},
	description={The English adjective free is commonly used in one of two meanings: ``at no monetary cost'' (gratis) and ``with little or no restriction'' (libre). This ambiguity of free can cause issues where the distinction is important, as it often is in dealing with laws concerning the use of information, such as copyright and patents. The terms gratis and libre may be used to categorise computer programs, according to the licenses and legal restrictions that cover them, in the free software and open source communities, as well as the broader free culture movement. For example, they are used to distinguish freeware (software gratis) from \gls{free-software} (software libre). ``Think free as in free speech, not free beer.'' -- Richard Stallman.%
			\footnote{\cite{enwiki:Gratis-versus-libre}}
		}}

\newglossaryentry{plate-solver}
{ name={plate solver},
	description={is software implementing a technique used in astronomy and applied on celestial images. Solving an image is finding match between the imaged stars and a star catalogue. The solution is a math model describing the corresponding astronomical position of each image pixel. The position of reference catalogue stars has to be known to a high accuracy so an astrometric reference catalogue is used. The image solution contains a reference point, often the image centre, image scale, image orientation and in some cases an image distortion model. With the astrometric solution it is possible to: 1) Calculate the celestial coordinates of any object on the image. 2) Synchronize the telescope mount or satellite pointing position to the center of the image taken. Astrometric solving programs extract the star x,y positions from the celestial image, groups them in three-star triangles or four-star quads. Then it calculates for each group a geometric hash code based on the distance and/or angles between the stars in the group. It then compares the resulting hash codes with the hash codes created from catalogue stars to find a match. If it finds sufficient statistically reliable matches, it can calculate transformation factors. There are several conventions to model the transformation from image pixel location to the corresponding celestial coordinates. The simplest linear model is called the \gls{WCS}. A more advanced convention is \gls{SIP} describing the transformation in polynomials to cope with non-linear geometric distortion in the celestial image, mainly caused by the optics.%
			\footnote{\cite{enwiki:Astrometric-solving}}
		}}

% TO ADD
% RamSat
% Dashboard
% photon
% giza (pgplot?)
% decay
% astrometry.net
% astap
% Source Extractor
% Watney
% PiCamera
% Unix
% IMX174
% OpenCV
% f-stop etc.
% KStars
% ekos
% gphoto
% distributions
% stphot
% allsky
% Pi/Raspberry Pi
% appropriate technology
% Lagrange point
% constellations
% fork
% port
% hamlib
% pier
% Celestron
% iOptron
% amateur radio
% ham
% star trails
% EQ equitorial
% fork software, fork mount
% firmware
% GOTO
% sidereal
% slew
% sky chart
% gpsd
% List of Software ?
