CaltechAUTHORS
  A Caltech Library Service

Improving Conical Scanning for Satellite Tracking On-The-Move

Karol, Robert and Ristroph, Gunnar (2012) Improving Conical Scanning for Satellite Tracking On-The-Move. , Pasadena, CA. (Unpublished) http://resolver.caltech.edu/CaltechAUTHORS:20131121-144343005

[img]
Preview
PDF - Submitted Version
See Usage Policy.

351Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20131121-144343005

Abstract

Mobile satellite antennas are gimbal-mounted with an active control system to keep the antenna pointed at the target satellite. Short time-scale antenna stabilization is achieved with gyroscope feedback. Long time-scale tracking of the satellite is maintained by scanning the antenna: The beam is intentionally nutated and the resulting change in signal strength is used to estimate how well the antenna is aligned to the satellite. We review the basic architectures for tracking with an outer control loop, assuming that the system is built upon a fast inner stabilization loop. The problem is formulated in a generic mathematical way, not specific to RF satellite communication. Approaches and nomenclature from other fields faced with the same problem of peak-seeking control are discussed. One common and simple technique for tracking is analyzed in detail to reveal the shortcomings that lead to degraded performance. An improvement is suggested and subjected to the same transient analysis to show the improvement. Implications to the overall closed-loop tracking systems are discussed.


Item Type:Report or Paper (Discussion Paper)
Subject Keywords:satellite tracking, satcom on-the-move, peak-seeking control, conical scanning, nutating beam, stabilized gimbal tracking
Record Number:CaltechAUTHORS:20131121-144343005
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20131121-144343005
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42630
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Nov 2013 02:13
Last Modified:22 Nov 2013 02:13

Repository Staff Only: item control page