Accession Number : AD0694467

Title :   FEED FORWARD EQUATIONS.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL SHIP ENGINEERING CENTER PORT HUENEME CALIF PORT HUENEME DIV

Personal Author(s) : Morris,George W. ; Stephens,George F.

Report Date : 20 JUN 1969

Pagination or Media Count : 18

Abstract : An AN/FPS-16 Radar will exhibit a tracking error in azimuth and elevation as a function of the angular velocity of the antenna pedestal. This tracking error is known as a velocity error. When the radar is mounted on a ship, the antenna motion is caused by ship attitude rates (in pitch, roll and yaw) as well as target motion. To reduce ship induced velocity errors in ship mounted AN/FPS-16 radars, two methods (which make use of on-mount gyros and feed forward stabilization) have been implemented. An on-mount gyro system consists of gyroscopes mounted on the radar antenna which sense antenna motion and send compensating signals back to the antenna servo mechanism. Feed forward stabilization consists of determining antenna angular rates caused by ships attitude changes, as measured by a stable platform (such as SINS), and feeding compensating signals back to the antenna servo mechanism. This report describes a method of implementing the computer programs required for feed forward stabilization. This report also extends the present concept of feed forward stabilization to include compensation for velocity errors induced by the kinematics of the tracked vehicle. (Author)

Descriptors :   (*RADAR ANTENNAS, STABILIZATION SYSTEMS), (*SHIP ANTENNAS, *STABILIZATION SYSTEMS), SERVOMECHANISMS, RADAR TRACKING, ERRORS, STABILIZED PLATFORMS, CORRECTIONS, EQUATIONS

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE