Glossary

It refers to satellites for communication use, but it has been used for broadcasting since 1992. Our group currently broadcasts communication satellites in JCSAT-3A (128°E), JCSAT-4B (124°E), and JCSAT-110A・JCSAT-110R (110°E).

Television that allows users to use video and applications over the Internet.A smart television (a television terminal that has the function of an Internet connection) is used, or a television terminal is connected to an Internet line via a streaming stick, a game machine, etc.

“Direct to home” refers to direct distribution of programs to households via satellite.

An Earth observation satellite is equipped with sensors that capture light and electromagnetic waves to monitor various phenomena on Earth from space. The type of sensors used depends on the purpose, such as tracking natural events, disaster surveillance, or observing changes caused by human activities. The data collected is provided as satellite images and observation data, which are used in areas like security, disaster monitoring, infrastructure inspection, and agricultural support.

Flexible payload refers to digital satellite communication technology that allows on-orbit reconfiguration. This includes adjusting the coverage area by changing the beam shape, controlling and redistributing power, and varying bandwidth using digital channelizers.

A name for a satellite communications service that provides communications services mainly to fixed earth stations. On the other hand, satellite communications services that mainly provide communication services to mobile earth stations are called MSS (Mobile Satellite Services).

Delivering programs directly to homes through fiber optics.

An HAPS is an unmanned aircraft that flies in the stratosphere at around 20 kilometers above the ground for several months without landing. It provides communication and observation services to the ground. HAPS is expected to enable high-speed, large-capacity, and low-latency direct communication with ultra-small devices like smartphones in areas where communication infrastructure is lacking, such as over oceans, in the sky, and in mountainous regions.

An HTS is a communications satellite that enables highspeed, large-capacity services. By using different frequencies for adjacent spot beams, it allows the same frequency to be reused in non-adjacent spot beams. HTS can provide throughput that is approximately tens to hundreds of times greater than that of conventional communication satellites.

A network that provides connectivity not only on land but also over the sea, in the air, and even in space, using a variety of platforms like satellites and HAPS (High Altitude Platform Stations)

A general term for services that distribute large volumes Contents , such as videos, via the Internet. Businesses that provide video services directly to viewers, bypassing the traditional communications Infrastructure , are called OTT businesses.

Quantum cryptography technology is an encryption technology that applies quantum mechanics (which describes the physical phenomena of extremely small particles) to cryptographic communications. Among these methods, the process of delivering encryption keys used for encryption and decryption by applying quantum technology is called Quantum Key Distribution (QKD).

The satellite at 110 degrees east uses circular polarization. Circular polarization refers to radio waves that travel in a spiral through the air, with right-hand circular polarization rotating clockwise like a clock and left-hand circular polarization rotating counterclockwise. Since left-hand circular polarization is a relatively new method, specialized equipment may be required for reception.

Cost of acquiring new subscribers. Advertising costs, subscription promotion costs, subscription campaign costs, customer center operating costs for subscription acquisition, etc.

This radar obtains information on the Earth’s surface by irradiating microwaves onto the surface and analyzing the signals that are reflected back. As the radar can penetrate clouds, it is possible to make observations both day and night, regardless of weather conditions.

A system that launches numerous artificial satellites into a specific orbit to function as a unified network. It is used for various purposes such as communication, Earth observation, and navigation.

By carrying a fully digitized communications payload, the allocation of satellite resources such as service area, frequency, and power can be efficiently changed in orbit according to communications demand. SDS is a next-generation digital satellite that enables flexible configuration of irradiation area by changing the beam shape; power control and redistribution; and in-orbit reconfiguration such as bandwidth variation by digital channelizers.

Space debris consists of unwanted artificial objects orbiting Earth. These include defunct satellites that have outlived their usefulness, parts and fragments from rockets used in launches, and even tiny debris created from collisions between other debris. As space exploration and utilization become more active, the amount of space debris continues to grow each year, making countermeasures increasingly necessary.

A new ICT infrastructure in space, aimed by SKY Perfect JSAT Corporation and NIPPON TELEGRAPH AND TELEPHONE CORPORATION, integrates HAPS, geostationary orbit satellites, and low Earth orbit satellites. These are connected to the ground with optical wireless communication networks to achieve advanced data processing through distributed computing.

The term 'Space Intelligence Business' is unique to our company and refers to a business that provides solutions for analyzing and utilizing various data, including geospatial information from Earth observation satellites, to support critical decision-making.

The ongoing monitoring of objects and phenomena in outer space, including artificial satellites, space debris, and celestial bodies.

A term combining "Transmitter" and "Responder." In satellite communications, it refers to a device that amplifies, converts, and transmits radio signals received from the ground. It is also known as a repeater or radio relay.

A next-generation communication infrastructure, especially featuring for software-defined satellites and NTN technology, planning to develop by SKY Perfect JSAT Corporation (applied trademark registration). This system aims to connect a world, making connectivity more user-friendly and access anytime, anywhere, to meet all needs.

The radio waves sent from the ground station to the satellite are called uplink, and the radio waves sent from the satellite to the viewers on the ground are called downlink.