Koden KGC-1 Manuale utente
AMENDMENT HISTORY
KGC-1 OPERATION MANUAL
Doc No: 0093121652
No. Document No &
Rev No
Date
(D/M/Y)
Amendments
0 93121652-00 04/07/28 First issue
1 0093121652-01 04/10/07 Chapter 1,Chapter 2
2 0093121652-02 06/02/15 Chapter 7
3 0093121652-03 06/07/11 Cover
4 0093121652-04 08/04/03 Chapter 7 7.3
5
6
7
8
9
10
Amendment policy
When any change is applied in the document, only the document number of the relevant sheet(s) and
cover sheet are modified and the rest of the sheets are not changed. The document number is shown in
the footer area, right or left bottom of each sheet..
○
c2004 2005 2006 2007 2008 Koden Electronics Co.,Ltd.All rights reserved.
No part of this publication may be reproduced, transmitted, translated in any form by any means without
the written permission of Koden Electronics Co., Ltd. The technical descriptions contained in this
publication are subject to change without notice. KODEN assumes no responsibility for any errors,
incidentals or consequential damages caused by misinterpretation of the descriptions contained in this
publication.
KGC-1 Preface
Preface
Handling this book Keep this operation manual free from lost and damage.
When the ownership of this equipment is changed due to
resale or delivery, please deliver without fail this operation
manual to the new owner.
SAFETY PRECAUTIONS
Symbols used in this manual
The following symbols are used in this manual. You are requested to be fully aware of the meaning of
each symbol before carrying out inspection and maintenance of this equipment.
Warning mark
Warning To handle the equipment ignoring this sign may lead to injury to the
human body or damage to the equipment.
Caution mark
To handle the equipment ignoring this sign may lead to a malfunction
of the equipment.
Caution
Warning High Voltage mark
To handle the equipment ignoring this sign may lead to electrical
shock to the human body.
Prohibition mark
This sign indicates that a specified action is prohibited. The
prohibited action will be shown in the vicinity of the mark
93121652-00 (1)
Preface KGC-1
OPERATIONAL PRECAUTIONS
This equipment is a navigational aid. For a final determination of
navigational command, you should consult regular navigational map
chart and other navigational devices in determining own position,
depth, information of approaching targets, obstacles, etc, for safer
navigation.
Warning
GPS (Global Positioning System) is a world wide positioning system
that is composed of 28 satellites, providing seamless positioning
service 24 hours a day everywhere on the earth. This system is run by
the U.S. Department of Defense. The accuracy of the bearing and
speed information it provides may be subject to change without notice
according to the US defense policy. Furthermore, a certain number of
satellites may be subject to operational interruption for the purpose of
adjustment, test, as well as orbital modification.
Caution
MAINTENACE PRECAUTIONS
zDisconnect Main Power
It is still possible to receive an electric shock caused by unintentional
switching of the unit to on during repair work. To prevent this from
happening, be sure to completely disconnect the unit from the ship’s
main supply before attempting any inspection. Put a safety card on the
POWER switch on the unit under repair that reads “Under
maintenance” to assist your safety during the maintenance work.
Warning
zDust
Dust can accumulate inside after long periods of use. Allergies can
result from the inhalation of this dust, therefore during inspection and
cleaning it is advisable to use a mask.
Caution
zStatic Electricity
Static sensitive semiconductor devices are used in this unit. Before
changing the printed boards be careful not to damage any of these
devices due to electrostatic build up from carpet, clothes, seats, etc
Caution
(2) 93121652-00
KGC-1 Preface
How to use this manual
Scope of this manual
This manual contains information about installation, operation and maintenance of the KGC-1 GPS
Compass unit.
Structure of this manual
This manual is divided into sections according to the contents as described below. This arrangement
will help you overview the whole of the contents as well as refer to detailed information for your specific
requirement.
Chapter 1: General
-About GPS Compass
-Equipment overview
-Applicable technical standards
-Equipment configuration
-Software type name
Chapter 2: Equipment Composition
-Standard equipment list
-Spare Parts list
-Installation Material list
-Available antenna cable types
-Optional items list
-
Chapter 3: Specifications
-Functional specification
-Serial data
-Power supply requirements
-Compass safety distance
-Environmental conditions
-External dimensions and weight
Chapter 4: Installation
-Installation consideration
93121652-00 (3)
Preface KGC-1
(4) 93121652-00
-Unpacking goods
-Inspection of component unit and accessories
-Siting the units
-Instructions for installation
-Cable layout and connections
-Connecting the units
-Check up after installation
Chapter 5: Operation
-Panel layout and operating switches
-Output ports
-Selecting the output data
Chapter 6 Maintenance and troubleshooting
-Periodical inspection and cleaning
-Trouble shooting
-
Chapter 7: Technical References
-Details of serial output data
-Data input/output serial line
-Setting the status switch
KGC-1 Chapter 1
Operation Manual General
Chapter 1 General
Page No.
1.1 About GPS compass....................................................................1-1
1.1.1 Principle of GPS positioning system....................................................1-1
1.1.2 How the GPS Compass works............................................................1-1
1.1.3 For proper use of GPS Compass........................................................1-1
1.2 Equipment overview....................................................................1-2
1.3 Applicable technical standards....................................................1-2
1.4 Equipment configuration .............................................................1-2
1.5 Software type name....................................................................1-2
93121652-00
KGC-1 Chapter 1
Operation Manual General
Chapter 1 General
1.1 About GPS compass
1.1.1 Principle of GPS positioning system
GPS (Global Positioning System) is a position measuring system using the artificial satellites, which
consists 27 artificial satellites (4 satellites per orbit x 6 orbits plus 3 reserve satellites), orbiting the
earth every 11hours 58 minutes along a circular path above the earth. In this system, positioning of a
point on the earth is achieved utilizing the triad system that a position on the earth is computed from
the distances from 3 satellites. The intersection of 3 imaginary arcs developed from each satellite
gives the own position (longitude, altitude and altitude) on the surface.
1.1.2 How the GPS Compass works?
In GPS positioning system, own position is obtained by analyzing the CA code sent from the satellites,
to compute the distance from the satellites to the user. In contrast, the GPS Compass utilizes the radio
wave itself that carries the positional data.
The GPS Compass uses two GPS antennas for reception. Knowing the time difference of the radio
wave arrival at each antenna, positional arrangement with respect to the satellite as well as the angle
of the incoming radio wave are computed. From the information sent from the satellite, the satellite
position is obtained. As a result, the direction of the two GPS antenna against north can be computed.
To obtain a correct ship’s heading the GPS Compass unit should sited somewhere on the line that
connects across the ship’s bow and stern,
Fig. 1.1 Principle of the measurement by the GPS Compass
θ：Angle of arrival of the GPS
radio wave
θ
Time difference of radio wave arrival
Ship’s bow
Heading direction
θ
93121652-01 1-1
Chapter 1 KGC-1
General Operation Manual
1.1.3 For proper use of GPS Compass
In the following circumstances the GPS Compass will take time to establish a correct bearing.
The unit is first operated.
The unit is left unused for a long period of time. This causes the stored orbital data to become old
and not useable.
The unit is carried to a distant area with power off and turned on again there.
The satellite positional dispersion is not perfect. This may causes the bearing computation to be
not established even though the positioning fix is available.
A GPS receiver is arranged to store the orbital data of the satellites viewable from its site. Due to this
arrangement, a fast position fix is possible. When the GPS unit is first turned on, no orbital data has
been stored in memory, causing the GPS unit to take about 15 minutes to acquire local orbital data
from the satellites. From next operation the orbital data used immediately before the unit is turned off
will be stored into memory and used for subsequent position fix. This causes the position fix time to be
reduced to one minute or the less.
1.2 Equipment overview
From the radio wave broadcast from the GPS satellites, the KGC-1 computes own ship’s bearing in
high accuracy by measuring the phase difference between two GPS antennas.
Four output ports are available on the KGC-1, two for the compass bearing output, the other two for
the GPS position/speed data.
1.3 Applicable technical standards
The KGC-1 is fully compliant with the requirements of IEC 60945 3rd Edition, general requirements for
maritime navigational equipment.
1.4 Equipment configuration
The following table lists the name of the unit, type name and the system configuration diagram is
shown in Fig. 1.2.
Unit name Type name
Processing unit KGC-1
GPS Antenna GA-11 with 15 m cable
Standard antenna cable length is 15 m. Extra cable lengths of 30 m and 60 m are available on option
basis.
1.5 Software type name
Two types of software are used in KGC-1 as follows:
1-2 93121652-01
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