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Z-Family Technical Reference Manual Z-Family Technical Reference Manual Ashtech 1170 Kifer Road Sunnyvale, CA USA 94086 Phone and Fax Numbers •Main • Voice: 408-524-1400 • Fax: 408-524-1500 • Sales • US: 800-922-2401 • International: 408-524-1670 • Fax: 408-524-1500 •Europe • Voice: 44-993-883-533 • Fax: 44-993-883-977 • Support • US: 800-229-2400 • International: 408-524-1680 • Fax: 408-524-1500 •BBS • Direct: 408-524-1527 Internet • [email protected] • http://www.ashtech.com Copyright Notice Copyright © 1998 Magellan Corporation. All rights reserved. No part of this publication or the computer programs described in it may be repro- duced, translated, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical photocopying, recording, or otherwise, without prior written permission of Magellan. Your rights with regard to this publication and the computer programs are subject to the restrictions and limitations imposed by the cop- yright laws of the United States of America (“U.S.A.”) and/or the jurisdiction in which you are located. For information on translations and distribution outside the U.S.A., please contact Ashtech. NO PATENT OR COPYRIGHT LIABILITY IS ASSUMED WITH RESPECT TO THE USE OF INFORMATION CONTAINED HEREIN. WHILE REASONABLE PRECAUTIONS HAVE BEEN TAKEN IN THE PREPARATION OF THIS PUB- LICATION, ASHTECH ASSUMES NO RESPONSIBILITY FOR ERRORS OR OMISSIONS, NOR IS ANY LIABILITY ASSUMED FOR DAMAGES RESULT- ING FROM THE USE OF THE INFORMATION CONTAINED HEREIN. FUR- THER, THIS PUBLICATION AND FEATURES DESCRIBED HEREIN ARE SUBJECT TO CHANGE WITHOUT NOTICE. Printed in the United States of America. © Copyright May, 1998 Magellan Corporation Part Number: 630203-01, Revision A ii Z-Family Technical Reference Manual Trademarks Z-Surveyor, Z-FX, Z-Sensor, Z-Eurocard, GPSTopo, and the Ashtech logo are registered trademarks of Magellan. All other product and brand names are trademarks or registered trademarks of their respective holders. iii iv Z-Family Technical Reference Manual Table of Contents Chapter 1. Introduction . 1 Performance Specifications . 1 Receiver Options . 2 [B] RTCM Base . 3 [U] RTCM Remote . 3 Reliance Fundamentals [E] Event Marker . 3 [X] External Frequency Reference . 3 [M] Remote Monitoring . 4 [F] Fast Data Output . 4 [T] Point Positioning . 4 [3] Observables—1, 2, 3 . 4 [J] RTK Rover . 4 [K] RTK Base . 4 Chapter 2. Operation . 5 Receiver Initialization . 5 Setting Receiver Parameters . 5 Saving Parameter Settings . 5 Data Recording (Z-Surveyor and Z-FX only) . 6 PCMCIA File Structure . 6 File Types . 7 File Naming Convention . 8 Data Logging through Serial Port . 9 Session Programming . 10 Position Mode/ALT Fix Mode . 11 Position Mode . 11 ALT Fix Mode . 11 Daisy Chain Mode . 11 Point Positioning . 12 Remote Monitoring . 12 Event Marker . 12 Time Tagging the Shutter Signal . 13 Closed-Loop Technique (Advanced Trigger) . 14 1PPS Out . 15 Data Output . 15 Transferring GPS Data . 16 Transferring Data Files using DOS . 16 Transferring Data Files using Download . 16 Table of Contents v Synchronization to GPS Time . 16 Default Parameters . 17 Multipath Mitigation . 21 Overview . 21 Evaluating Correlator Performance . 21 Signal to Noise Ratio . 23 Antenna Reduction . 24 Chapter 3. Differential and RTK Operations . 27 Base Stations . 27 Setting Up a Differential Base Station . 27 Setting Up an RTK Base Station . 28 RTCM 18 & 19 . 28 RTCM 20 & 21 . 29 Ashtech DBN Format . 30 Setting Up a Combined Differential and RTK Base Station . 31 Advanced Base Station Operation . 32 Recommended Advanced Parameter Settings for Base Stations . 32 Antenna . 32 Message Rate . 32 Required Differential Update Rates . 33 Mask Angle . 36 Base Station Position . 36 Base Station Antenna Offset . 37 Using Reference Station ID . 37 Reference Station Health . 37 Other RTCM Messages . 37 Using a PC Interface . 38 Using a Handheld Interface . 38 Remote Stations . 38 Setting Up a Differential Remote Station . 38 Setting Up an RTK Remote Station . 39 Using RTCM Messages . 39 Using Ashtech DBN Messages . 40 Advanced Remote Station Operation . 41 Base Station Data . 41 Base Data Latency . 42 Differential Accuracy vs. Base Data Latency . 43 RTK Accuracy and Update Rates vs. Base Data Latency . 43 Float and Fixed Solutions . 44 Carrier Phase Initialization . 45 Mask Angles . ..
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