logging in or signing up GPS sky aSGuest169 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 539 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: September 25, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: ahmedsalim (10 month(s) ago) thank u Saving..... Post Reply Close Saving..... Edit Comment Close By: unleash.thunder (13 month(s) ago) lodu..... Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript GPS SKY : GPS SKY What is the Sky Doing Today? Objective : Objective Slide 3: Summary of Topics - Importance of Planning - Review how GPS Calculates Positions - Check Out The Sky - Planning Ahead Slide 4: Planning the GPS Day Recreational GPS is very forgiving It’s for fun! Not for worrying about PDOP,SNR,Mask Angle,blah blah… Designed to Work inside your Pocket! Still important - as will be demonstrated Slide 5: Tracking a GPS Satellite Vehicle (SV) One of 29 12,000 miles up 6000 mph JTRACK http://liftoff.msfc.nasa.gov /RealTime/JTrack/3D/JTrack3D.html How to Calculate a Position : How to Calculate a Position Measure the Distance to the Satellites Review How to Calculate Distance : How to Calculate Distance Speed of Light x Travel Time Distance Time signal left satellite Current time Review Minimum # of Satellites Required : Minimum # of Satellites Required 4 Unknowns Require 4 Satellites time ...……………… (1) satellite latitude ……………. (1) satellite longitude .…………. (1) satellite elevation …..…….… (1) satellite 4 Satellites = 3D Good 3 Satellites = 2D BAD A Garmin will allow 2D positioning! Watch Out! PDOPPosition Dilution of Precision : - Want tetrahedron as large as possible - Want index as low as possible PDOPPosition Dilution of Precision Garmins View of Mapping : Garmins View of Mapping Typical Mapping Grade GPS Settings - PDOP = 99 - SNR = 2 - Mask Angle = 5 º PDOP = 6 SNR = 6 Mask Angle = 15º Garmin Says... GO FOR IT! PDOP / DOPPosition Dilution of Precision : Rules of Thumb PDOP of 6 or Less - Good DOP of 3 or Less - Good PDOP / DOPPosition Dilution of Precision Garmin only Shows DOP That’s 1/2 of PDOP Garmin III Plus Screen Slide 12: Tools for Predicting - See PDF on How To: CD</software/TrimblePlanSoftware Almanac File: Software: From CD </software/TrimblePlanSoftware or http://www.trimble.com/planningsoftware_ts.asp PDOP and Visibility Graphs : PDOP and Visibility Graphs Instructor Runs Trimble Planning Software for Today PDOP and Visibility Graphs : PDOP and Visibility Graphs It’s Your Decision : It’s Your Decision Plenty of satellites In a hurry to go Limited control Must collect now Reasons to plan Reasons not to plan More efficient More economical Forewarned Plan Ahead : Plan Ahead External Antenna Wait till Good Sky Returns Offsets Map Using other Means? Steps You Can Take Break : 17 Coming Up GPS Sky Garmin Setup Get Outside! Break You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
GPS sky aSGuest169 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 539 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: September 25, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: ahmedsalim (10 month(s) ago) thank u Saving..... Post Reply Close Saving..... Edit Comment Close By: unleash.thunder (13 month(s) ago) lodu..... Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript GPS SKY : GPS SKY What is the Sky Doing Today? Objective : Objective Slide 3: Summary of Topics - Importance of Planning - Review how GPS Calculates Positions - Check Out The Sky - Planning Ahead Slide 4: Planning the GPS Day Recreational GPS is very forgiving It’s for fun! Not for worrying about PDOP,SNR,Mask Angle,blah blah… Designed to Work inside your Pocket! Still important - as will be demonstrated Slide 5: Tracking a GPS Satellite Vehicle (SV) One of 29 12,000 miles up 6000 mph JTRACK http://liftoff.msfc.nasa.gov /RealTime/JTrack/3D/JTrack3D.html How to Calculate a Position : How to Calculate a Position Measure the Distance to the Satellites Review How to Calculate Distance : How to Calculate Distance Speed of Light x Travel Time Distance Time signal left satellite Current time Review Minimum # of Satellites Required : Minimum # of Satellites Required 4 Unknowns Require 4 Satellites time ...……………… (1) satellite latitude ……………. (1) satellite longitude .…………. (1) satellite elevation …..…….… (1) satellite 4 Satellites = 3D Good 3 Satellites = 2D BAD A Garmin will allow 2D positioning! Watch Out! PDOPPosition Dilution of Precision : - Want tetrahedron as large as possible - Want index as low as possible PDOPPosition Dilution of Precision Garmins View of Mapping : Garmins View of Mapping Typical Mapping Grade GPS Settings - PDOP = 99 - SNR = 2 - Mask Angle = 5 º PDOP = 6 SNR = 6 Mask Angle = 15º Garmin Says... GO FOR IT! PDOP / DOPPosition Dilution of Precision : Rules of Thumb PDOP of 6 or Less - Good DOP of 3 or Less - Good PDOP / DOPPosition Dilution of Precision Garmin only Shows DOP That’s 1/2 of PDOP Garmin III Plus Screen Slide 12: Tools for Predicting - See PDF on How To: CD</software/TrimblePlanSoftware Almanac File: Software: From CD </software/TrimblePlanSoftware or http://www.trimble.com/planningsoftware_ts.asp PDOP and Visibility Graphs : PDOP and Visibility Graphs Instructor Runs Trimble Planning Software for Today PDOP and Visibility Graphs : PDOP and Visibility Graphs It’s Your Decision : It’s Your Decision Plenty of satellites In a hurry to go Limited control Must collect now Reasons to plan Reasons not to plan More efficient More economical Forewarned Plan Ahead : Plan Ahead External Antenna Wait till Good Sky Returns Offsets Map Using other Means? Steps You Can Take Break : 17 Coming Up GPS Sky Garmin Setup Get Outside! Break