ADU2 datasheet(13/162 Pages) ETC

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Introduction

Page 1

Introduction

The Ashtech ADU2 is the most precise GPS-based three-dimensional position and attitude

determination system available, providing real-time heading pitch, and roll measurements

with accurate position and velocity perfect for static and dynamic platforms. The ADU2

offers unparalleled accuracy as a real-time attitude sensor in high-precision GPS

applications such as gyrocompass calibration, open-pit mining, seismic exploration, and

oecanographic research.

GPS-based attitude determination technology is based on differential carrier phase

measurements between four antennas connected to the receiver. The ADU2 employes a 4

antenna/12 channel configuration with the ability to select the best eight of twelve

channels to use in PDOP (Position Dilution of Precision)- based satellite searching and

tracking. This improves solution integrity, allowing close to 100% attitude availability,

providing two meter position accuracy and attitude angles can be as accurate as one

milliradian (0.057°) or better in real-time at a 2 Hz update rate.

The ADU2 capably compensates for a variety of antenna configurations in order to

accommodate diverse vehicle mounting requirements and cable lengths. In installations,

the unit requires that relative positions need only be determined once per installation.

Ashtech provides solutions for calibration in stationary conditions (e.g. an airplane on a

runway) and dynamic conditions (e.g. a ship at sea), saving valuable time before

beginning navigation computations.

How To Use This Manual

This manual describes the Ashtech ADU2 standard and optional configurations,

installation procedures, operation procedures, and requirements for a communications

interface with external equipment.

This manual explains how to install the ADU2 and calibrate the antenna array. For

environments where the ADU2 default settings are not suitable, instructions are included

to change the operating parameters using an external interface device such as a personal

computer.

Common GPS acronyms are listed in Appendix C, Reference.

This manual is divided into the following parts:

•

Chapter One: Introduction— general information on the ADU2 and

interfacing cables, including pin assignments.

•

Chapter Two: Quickstart—quick overview of the ADU2 installation process.

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