The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 05, 2001
Filed:
Oct. 01, 1999
Hitachi, Ltd., Tokyo, JP;
Abstract
An earth observation system capable of observing the earth globally and uniformly in a steady observation operation mode while observing a given district on the earth in a high-frequency observation operation mode, as occasion requires, includes a plurality of observation satellites each equipped with an orbit transfer facility, an observation data receiving system, an observation satellite operating ground system, an observation command facility such as anti-disaster task forces, institutes or the like. In the steady observation operation mode for observing globally the earth, M observation satellites are constellated on each of L sun-synchronized quasi-recurrent orbits each having a same altitude and a same inclination (where L and M represents natural numbers). In the high-frequency observation operation mode for observing a particular district on the earth, M satellites are constellated on each of L sun-synchronized recurrent orbits each having a nominal altitude of 561 km and a nominal inclination 97.6 degrees or alternatively a nominal altitude of 888.3 km and a nominal inclination of 98.8 degrees.