Positioning/Navigation
type: Concept

SCA
type: Concept
definition: The Spatial Coordinate Apparatus (SCA) consists of four arms connected to potentiometers. The top three arms can move in a vertical plane while the fourth arm can rotate upon its longitudinal axis. As the arms rotate, the angles of the rotation are measured in terms of voltages from the potentiometers and recorded in a computer. These voltage readings were then converted into 3-dimensional coordinates (x, y, z) of the endpoint of the top arm. [Source: ORNL] Group: Instrument_Details Entry_ID: SCA Group: Instrument_Identification Instrument_Category: Earth Remote Sensing Instruments Instrument_Class: Passive Remote Sensing Instrument_Type: Positioning/Navigation Short_Name: SCA Long_Name: Spatial Coordinate Apparatus End_Group Group: Associated_Platforms Short_Name: GRACE End_Group Group: Instrument_Logistics Instrument_Owner: USA/NASA End_Group End_Group
in scheme: instruments