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Browse Prior Art Database

Spaceborne Detection System

IP.com Disclosure Number: IPCOM000075784D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Hess, GK: AUTHOR [+2]

Abstract

It is desirable to have spaceborne sensors "look" in the direction of objects of interest visible to them most of the time, and "hurry" past azimuthal intervals where the probability distribution factor (PDF) is low. A means of controlling the angular time distribution for the sensor has been developed. Illustrated is a satellite configuration to implement the solution to the problem. The sensor telescope rotates in the opposite direction from that of the rest of the satellite (or some part thereof referred to as the "can"). The angular momentums of the sensor telescope and the can are equal and opposite, so that gyroscopic affects are not produced which tend to complicate satellite attitude control.

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Spaceborne Detection System

It is desirable to have spaceborne sensors "look" in the direction of objects of interest visible to them most of the time, and "hurry" past azimuthal intervals where the probability distribution factor (PDF) is low. A means of controlling the angular time distribution for the sensor has been developed. Illustrated is a satellite configuration to implement the solution to the problem. The sensor telescope rotates in the opposite direction from that of the rest of the satellite (or some part thereof referred to as the "can"). The angular momentums of the sensor telescope and the can are equal and opposite, so that gyroscopic affects are not produced which tend to complicate satellite attitude control. By effecting changes in these two equal and opposite angular momentum values, it is possible to alter the otherwise uniform angular scan rate. Using a torquing means which changes angular momentum with a minimum loss of energy, it is possible to keep the sensor telescope pointing in a preferred direction (corresponding to large values of PDF) for a greater time interval than would be available with a uniform scan rate.

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