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Glossary Index

L

L Band

L Band is the 1 to 2 GHz range of the radio spectrum and is very popular for satellite communications. It is a good balance of antenna size, bandwidth, and atmospheric interference. Ionospheric scintillations are worse at lower frequencies than high. VHF frequencies, such as the 240 MHz frequencies used in military communications, suffer the most, while L-band is moderately affected, and only the strongest scintillations affect C-band and above.

View Source: http://en.wikipedia.org/wiki/L_band

Latitude

In geography, latitude (φ) is a geographic coordinate that specifies the north–south position of a point on the Earth's surface.

View Source: https://en.wikipedia.org/wiki/Latitude

LBS

Location Based Services - The Iridium Extreme™ GPS and Location-Based Service features allow you to view, send, or restrict your location information. There are four main components to setup and use these features: 1.) Location Options Setup Menu: located in the Iridium Extreme™ main menu in the setup section, Location Options Options is where you customize your GPS, emergency, message, and format options. 2.) Programmable SOS button: this red button is located on the top of the phone, under a protective cover. By removing the cover and and pressing the red button you can send your location information to your designated contact in the event of an emergency. 3.) Location Convenience Key: located on the right side of the phone, you can to press this key to view your location and share it via SMS to either a pre-programmed “Quick GPS” contacts or a new message contact. 4.) Online portal integration with 3rd party providers: enables the transmission of the phone’s location information on a scheduled interval via short-burst data (SBD) to 3rd party portal providers for online tracking

View Source: http://www.groundcontrol.com/iridium/Iridium_Extreme_Location_Based_Services.pdf

Leap Second

A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time, or UT1. Without such a correction, time reckoned by Earth's rotation drifts away from atomic time because of irregularities in the Earth's rate of rotation. Since this system of correction was implemented in 1972, 25 such leap seconds have been inserted. The most recent one happened on June 30, 2012 at 23:59:60 UTC. A leap second, the 26th, will again be inserted at the end of June 30, 2015 at 23:59:60 UTC.

View Source: https://en.wikipedia.org/wiki/Leap_second

LiPo

A lithium polymer battery, or more correctly lithium-ion polymer battery (abbreviated variously as LiPo, LIP, Li-poly and others), is a rechargeable battery of lithium-ion technology in a pouch format. Unlike cylindrical and prismatic cells, LiPos come in a soft package or pouch, which makes them lighter but also lack rigidity.

View Source: https://en.wikipedia.org/wiki/Lithium_polymer_battery

Longitude

Longitude is a geographic coordinate that specifies the east-west position of a point on the Earth's surface.

View Source: https://en.wikipedia.org/wiki/Longitude

LoRa

LoRaWAN™ is a Low Power Wide Area Network (LPWAN) specification intended for wireless battery operated Things in regional, national or global network. LoRaWAN target key requirements of internet of things such as secure bi-directional communication, mobility and localization services. This standard will provide seamless interoperability among smart Things without the need of complex local installations and gives back the freedom to the user, developer, businesses enabling the roll out of Internet of Things.

View Source: https://www.lora-alliance.org/What-Is-LoRa/Technology

LoRaWAN

LoRaWAN™ is a Low Power Wide Area Network (LPWAN) specification intended for wireless battery operated Things in regional, national or global network. LoRaWAN target key requirements of internet of things such as secure bi-directional communication, mobility and localization services. This standard will provide seamless interoperability among smart Things without the need of complex local installations and gives back the freedom to the user, developer, businesses enabling the roll out of Internet of Things.

View Source: https://www.lora-alliance.org/What-Is-LoRa/Technology

Low Earth Orbit

A low Earth orbit (LEO) is an orbit around Earth with an altitude between 160 kilometers (99 mi) (orbital period of about 88 minutes), and 2,000 kilometers (1,200 mi) (about 127 minutes). Objects below approximately 160 kilometers (99 mi) will experience very rapid orbital decay and altitude loss.

View Source: http://en.wikipedia.org/wiki/Low_Earth_orbit

LUA

A powerful, fast, lightweight, embeddable scripting language. Lua combines simple procedural syntax with powerful data description constructs based on associative arrays and extensible semantics. Lua is dynamically typed, runs by interpreting bytecode for a register-based virtual machine, and has automatic memory management with incremental garbage collection, making it ideal for configuration, scripting, and rapid prototyping.

View Source: http://www.lua.org/about.html

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