Secor

SECOR (Sequential Collation of Ranges) was a series of small United States Armed Forces satellites launched in the 1960s for geodesy measurements that precisely determined the locations of points on the Earth's surface, particularly of isolated islands in the Pacific Ocean. This data allowed for improved global mapping and precise positioning of ground stations for other satellites. Any SECOR satellite could be linked to four mobile ground stations: three were placed in accurately determined known locations, and a fourth one was placed in an unknown location. By measuring a satellite's distance from the three known stations, its position in space was determined. Then, the distance between the unknown ground station and the previously determined satellite's position was used to compute the unknown ground station's coordinates. This process was repeated many times, to enhance the accuracy of the measurement. Once the unknown station's position was accurately determined, it became a known station. Then one of the four stations was moved to a new unknown point, and the process began again. SECOR was a predecessor to navigational satellite systems such as Timation and Navstar-GPS (Global Positioning System).

Secor may refer to: ==Places== ===United States=== Secor, Illinois, village Secor, Iowa, ghost town ==People== T. F. Secor (1808–1901), American marine engineer Martin Mathias Secor (1841–1911), American businessman and politician Lella Secor Florence (1887–1966), American writer and activist George Secor (1943–2020), American musical theorist The eponymous secor (interval) Kyle Secor (born 1957¹), American actor Ketch Secor (fl. 21st cen.), American musician of Old Crow Medicine Show ==See also== SECOR (Sequential Collation of Ranges), a series of small geodetic United States Armed Forces satellites launched in the 1960s SECORE (marine conservation organization)

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