Browse Prior Art Database

REAL-TIME MINIMIZATION TECHNIQUE FOR EARTH TERMINAL WEATHER EFFECTS

IP.com Disclosure Number: IPCOM000008871D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-19
Document File: 4 page(s) / 154K

Publishing Venue

Motorola

Related People

Michael Addison Miller: AUTHOR [+2]

Abstract

This publication discusses a technique for utilir- ing real-time ET (Earth Terminal) weather history information to select which of the available ETs in a multi-ET ground station configuration should be used as primary and backup ETs in order to opti- mize the success rate of SV (Satellite Vehicle) acquisitions and SV data transfers.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 50% of the total text.

Page 1 of 4

0 M

MOTOROLA Technical Developments

REAL-TIME MINIMIZATION TECHNIQUE FOR EARTH

TERMINAL WEATHER EFFECTS

by Michael Addison Miller and James Morris Tooker

OVERVIEW

  This publication discusses a technique for utilir- ing real-time ET (Earth Terminal) weather history information to select which of the available ETs in a multi-ET ground station configuration should be used as primary and backup ETs in order to opti- mize the success rate of SV (Satellite Vehicle) acquisitions and SV data transfers.

PROBLEM

   A number of factors are involved in the selec- tion of a primary and backup ET. These factors include the operational status of the ET, the cm-rent availability of the ET, and the transmitter usage level.

  Unfortunately, due to weather conditions (such as heavy rainfall), the availability of an ET is a highly dynamic variable that can not always be accurately predicted ahead of time.

  A method to deal with the ever-changing weath- er pattern and its effect on ET selection needs to be devised.

  Whenever an ET transfers control to a backup ET there is an impact to the system. Communications interruption occurs while primary and backup ET transmitters power down and up, respectively. While minimal in duration, the end user does perceive an impact in performance of the system and efforts should be made to minimize the opportumtles for ET control transfer.

  We have developed a technique for optimizing the selection of the primary ET such that transfer to the backup ET is minimized.

  By implementing a real-time, ET specific, weather history, a better decision as to which ETs should be primary and which should be backup may be made. Specifically, by keeping a real-time record of ET "failures" attributable to weather conditions on a per ET basis, comparisons may be made during SV acquisition to determine which ET is best suited to take the primary role. Although there are no guarantees for success, we have increased the likeli- hood for success by making an ET more likely to "fail" a backup rather than a primary ET.

  In the following example we will utilize three ET configurations and an incorporated "role swap- ping" enhancement which provides for more evenly distributed ET hardware usage. For simplicity "rain history" will be used in the Comments field to denote a condition under which the recommended real-time history record indicates a recent history of weather related ET "failures". DSP (Diagnostic Scheduling Point) and CSP (Critical Scheduling Point) represent the scheduling periods within which ET selection decisions are made; the DSP is when the static decision making process occurs, while the CSP is when dynamic decisions may be made. The CSP is where a real-time, ET specific, history will be utilized. The example shows several scheduling periods (denoted by DSPl, CSPl, __., DSPn, CSPn) wherein a role selection is made for each ET, the

DESCRIPTION

  Heavy rain conditions can cause...