Browse Definitions :
Definition

low earth orbit (LEO) satellite

A low earth orbit (LEO) satellite is an object, generally a piece of electronic equipment, that circles around the earth at lower altitudes than geosynchronous satellites.

LEO satellites orbit between 2,000 and 200 kilometers above the earth. LEO satellites are commonly used for communications, military reconnaissance, spying and other imaging applications.

Most of the man-made objects orbiting earth are in LEO. Satellites made for communications benefit from the lower signal propagation delay to LEO. This lower propagation delay results in less latency. Being closer to the earth has an obvious benefit for many types of earth observational satellites by resolving smaller subjects with greater detail.

LEO satellites are generally less costly to place as they require a great deal less rocket power to place. As compared to geosynchronous orbiting satellites at 36,000 km, LEO travel through a much denser atmosphere and thus experience far more aerodynamic drag. This means they require more power to travel at higher speeds and make corrections to maintain their lower orbits. Where geosynchronous satellite orbits in time with earth rotation at about 3.06 x 103 meters per second an LEO satellite might travel at 7.78 x 103 meters per second, orbiting many times a day. The ISS orbits at 400 km and makes a full revolution round the earth about every 93 minutes.

LEO satellites have a much smaller field of communication with earth than a satellite at greater altitude. They also have a faster rotation around the earth. These factors necessitate a constellation of satellites to operate in concert for some applications. A constellation is a group of satellites working in concert, spaced in order to provide the required coverage.

The range of LEO satellites ends where medium earth orbit (MEO) begins at 2,000 km. MEO extends to the reaches of geostationary or geosynchronous orbit.

This was last updated in August 2019

Continue Reading About low earth orbit (LEO) satellite

SearchCompliance
  • OPSEC (operations security)

    OPSEC (operations security) is a security and risk management process and strategy that classifies information, then determines ...

  • smart contract

    A smart contract is a decentralized application that executes business logic in response to events.

  • compliance risk

    Compliance risk is an organization's potential exposure to legal penalties, financial forfeiture and material loss, resulting ...

SearchSecurity
  • email virus

    An email virus consists of malicious code distributed in email messages to infect one or more devices.

  • key fob

    A key fob is a small, programmable device that provides access to a physical object.

  • identity theft

    Identity theft, also known as identity fraud, is a crime in which an imposter obtains key pieces of personally identifiable ...

SearchHealthIT
SearchDisasterRecovery
  • What is risk mitigation?

    Risk mitigation is a strategy to prepare for and lessen the effects of threats faced by a business.

  • change control

    Change control is a systematic approach to managing all changes made to a product or system.

  • disaster recovery (DR)

    Disaster recovery (DR) is an organization's ability to respond to and recover from an event that affects business operations.

SearchStorage
  • JBOD (just a bunch of disks)

    JBOD, which stands for 'just a bunch of disks,' is a type of multilevel configuration for disks.

  • bare-metal restore

    A bare-metal restore (also referred to as bare-metal recovery or bare-metal backup) is a data recovery and restoration process ...

  • mSATA SSD (mSATA solid-state drive)

    An mSATA SSD is a solid-state drive (SSD) that conforms to the mSATA interface specification developed by the Serial ATA (SATA) ...

Close