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This set of models is often referred to collectively as SGP4 due to the frequency of use of that model particularly with two-line element sets produced by NORAD and NASA. These models predict the effect of perturbations caused by the Earth’s shape, drag, radiation, and gravitation effects from other bodies such as the sun and moon.
The Satellite Catalog Number (SATCAT), also known as NORAD Catalog Number, NORAD ID, USSPACECOM object number, is a sequential nine-digit number assigned by the United States Space Command (USSPACECOM), and previously the North American Aerospace Defense Command (NORAD), in the order of launch or discovery to all artificial objects in the orbits of Earth and those that left Earth's orbit. [1]
Keplerian elements parameters can be encoded as text in a number of formats. The most common of them is the NASA / NORAD "two-line elements" (TLE) format, [4] originally designed for use with 80 column punched cards, but still in use because it is the most common format, and 80-character ASCII records can be handled efficiently by modern databases.
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The improved version became the standard model for NORAD in the early 1970s, which ultimately led to the creation of the TLE format. At the time there were two formats designed for punch cards , an "internal format" that used three cards encoding complete details for the satellite (including name and other data), and the two card "transmission ...
A map of NORAD regions and sectors. North American Aerospace Defense Command (NORAD / ˈ n ɔːr æ d /; French: Commandement de la Défense Aérospatiale de l'Amérique du Nord, CDAAN), known until March 1981 as the North American Air Defense Command, is a combined organization of the United States and Canada that provides aerospace warning, air sovereignty, and protection for Canada and the ...
The Near Earth Object Surveillance Satellite (NEOSSat) [8] is a Canadian microsatellite using a 15-cm aperture f/5.88 Maksutov telescope (similar to that on the MOST spacecraft), with 3-axis stabilisation giving a pointing stability of ~2 arcseconds in a ~100 second exposure.
The aerostat radar data is available to NORAD and U.S. Customs and Border Protection. Since October 2017, the aerostat has been fully utilized by Philippine Navy operators to monitor People's Liberation Army Navy and China Coast Guard movements in the South China Sea and Benham Rise. Daily operations of the aerostat have augmented the ...