Manuals / Brands / TV and Video / Satellite TV System / Trimble Outdoors / TV and Video / Satellite TV System

Trimble Outdoors AgGPS 252 2 Overview, 14 AgGPS 252 Receiver User Guide, Table 2.5 Factors that influence the accuracy of GPS positions (continued)

1 72

Download 72 pages, 1.76 Mb

2 Overview

14 AgGPS 252 Receiver User Guide

26.1 Coordinate systems

Geographic data obtained from different sources must be referenced to the same datum, ellipsoid, and coordinate format. Different formats provide different coordinate values for any geographic location. In North America, the datums NAD-27 and NAD-83 are commonly used in Agricultural mapping applications.

Minimum

elevation

> 10 Satellites that are low on the horizon typically produce weak

and noisy signals and are more difficult for the receiver to track.

Satellites below the minimum elevation angle are not tracked.

Multipath

environment

Low Multipath errors are caused when GPS signals are reflected off

nearby objects and reach the receiver by two or more different

paths. The receiver incorporates the EVEREST multipath

rejection option.

RTCM-

compatible

corrections

These corrections are broadcast from a Trimble AgGPS 214,

MS750, or equivalent reference station.

RTK Base station

coordinate

accuracy

For RTK positioning, it is important to know the base station

coordinates accurately. Any error in the position of the base

station affects the position of the rover; every 10 m of error in a

base station coordinate can introduce up to 1 ppm scale error

on every measured baseline. For example, an error of 10m in

the base station position produces an error of 10mm over a

10km baseline to the rover.

For more information about how to make sure the position of

your base station is accurate, refer to the manual for your base

station receiver.

Multiple RTK

base stations

If you are using several base stations to provide RTK corrections

to a large site area, all base stations must be coordinated

relative to one another. If they are not, the absolute positions

at the rover will be in error. For more information about how to

use several base stations to cover your site, contact your local

Trimble Reseller.

Table 2.5 Factors that influence the accuracy of GPS positions (continued)

Condition Optimum

value

Description

Ag252_100B_UserGuide_ENG.book Page 14 Thursday, July 28, 2005 4:06 PM

Contents

Main trimble_support@trimble.com www.trimble.com C Recycling in Europe Page Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . .1 2 Overview . . . . . . . . . . . . . . . . . . . . . . . . .3 3 Installing the Receiver. . . . . . . . . . . . . . . . . 17 Page Introduction C Overview Page Page Page Page 2 Overview 8 AgGPS 252 Receiver User Guide Note WAAS/EGNOS and OmniSTAR VBS use the Satellite Differential GPS positioning method. Table 2.1 LED sequences with Satellite Differential GPS or Autonomous positioning Table 2.2 LED sequences with RTK positioning AgGPS 252 Receiver User Guide 9 Overview 2 Table 2.3 LED sequences with OmniSTAR HP positioning Table 2.2 LED sequences with RTK positioning (continued) Page Page Page AgGPS 252 Receiver User Guide 13 Overview 2 Table 2.5 Factors that influence the accuracy of GPS positions 2 Overview 14 AgGPS 252 Receiver User Guide Table 2.5 Factors that influence the accuracy of GPS positions (continued) Page Page Installing the Receiver Page C Page Page Page Page Page AgGPS 252 Receiver User Guide 25 Installing the Receiver 3 Table 3.4 Port B pinout Table 3.3 Port A pinout (continued) Page Configuring the Receiver D/3D 07 DOP03 WAAS 122 04 Page Page Operate in RTK Mode Page AgGPS 252 Receiver User Guide 33 Configuring the Receiver 4 The default port settings are: Table 4.1 Port input settings I RTCM 9600 8N1 0 NMEA 4800 Page Page Troubleshooting 38 AgGPS 252 Receiver User Guide Global Positioning System (GPS) AgGPS 252 Receiver User Guide 39 Troubleshooting 5 40 AgGPS 252 Receiver User Guide Page 42 AgGPS 252 Receiver User Guide Interference AgGPS 252 Receiver User Guide 43 Troubleshooting 5 GPS receiver AgRemote utility FlashLoader 200 upgrade utility Page Page AgGPS 252 Receiver User Guide 47 Ag252_100B_UserGuide_ENG.book Page 47 Thursday, July 28, 2005 4:06 PM START HERE Figure 6.1 Troubleshooting system hardware and power 48 AgGPS 252 Receiver User Guide Ag252_100B_UserGuide_ENG.book Page 48 Thursday, July 28, 2005 4:06 PM R E H AgGPS 252 Receiver User Guide 49 Ag252_100B_UserGuide_ENG.book Page 49 Thursday, July 28, 2005 4:06 PM R E H 50 AgGPS 252 Receiver User Guide Ag252_100B_UserGuide_ENG.book Page 50 Thursday, July 28, 2005 4:06 PM R E H AgGPS 252 Receiver User Guide 51 Ag252_100B_UserGuide_ENG.book Page 51 Thursday, July 28, 2005 4:06 PM START HERE Figure 6.5 Using AgRemote to troubleshoot RTK Page APPENDIX A AgGPS 252 Receiver User Guide 53 Specifications Tabl e A. 1 AgGPS 252 receiver A Specifications TableA.2 lists the performance characteristics of GPS channels. 54 AgGPS 252 Receiver User Guide Table A.2 GPS channels performance Tabl e A. 1 AgGPS 252 receiver (continued) AgGPS 252 Receiver User Guide 55 Receiver Table A.3 L-Band satellite differential correction receiver with OmniSTAR support Table A.2 GPS channels performance (continued) TableA.4 lists the receiver default settings. APPENDIX B AgGPS 252 Receiver User Guide 57 Third-Party Interface Requirements Table B.1 Third-party software interface requirements B Third-Party Interface Requirements TableB.2 lists the interface requirements for connecting an AgGPS receiver to third-party hardware. Table B.2 Third-party h ardware interface require ments Table B.1 Third-party software interface requirements (continued) AgGPS 252 Receiver User Guide 59 Third-Party Interface Requirements B Table B.2 Third-party hardware interface requirements (continued) B Third-Party Interface Requirements 60 AgGPS 252 Receiver User Guide Table B.2 Third-party hardware interface requirements (continued) Index Numerics A B C D E F G H I J L M P R S T U V W Y