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DOPPLER SONAR
CURRENT INDICATOR
CI-80
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C Your Local Agent/Dealer 9- 52, A s hi har a- c ho, Nishinomiya, Japan Telephone: 0798-65-2111 Telefax: 0798-65-4200 FIRST EDITION : FEB. 1995 All rights reserved. Printed in Japan F : JAN. 6, 2001 PUB. No. OME-72390 CI-80 (DAMI)
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SAFETY INSTRUCTIONS WARNING WARNING Keep heater away from equipment. ELECTRICAL SHOCK HAZARD Do not open the equipment. A heater can melt the equipment’s power Only qualified personnel cord, which can cause fire or electrical should work inside the shock. equipment. Use the proper fuse. Immediately turn off the power at the switchboard if water leaks into the Fuse rating is shown on the equipment. equipment or something is dropped in Use of a wrong fuse can result in equip- the equipment. ment d
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Table of Contents PRINCIPLE OF MEASUREMENT................................................................................ 1 PRINCIPLE OF MEASUREMENT, FEATURES.................................................................................. 1 TIDE, NAV-TIDE & TIDE DIFFERENTIAL .......................................................................................... 4 IMPORTANT NOTICE ON TIDE MEASUREMENTS.......................................................................... 8 Features .....
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PRINCIPLE OF MEASUREMENT PRINCIPLE OF MEASUREMENT, FEATURES When a moving vessel emits an acoustical pulse into the water at an angle, a portion of emitted energy is reflected from the seabed and other microscopic objects in the sound path, such as plankton or air bubbles. The frequency of the received signal is shifted from the transmitted frequency in proportion to relative velocity between the vessel and underwater reflecting objects. This is called Doppler Effect. The CI-80 calculates and di
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GPS satellites Nav-aided speed (Pseudo ground tracking speed) Water tracking speed Near-surface layer :Base of measurement Ground tracking speed Fixed Figure 2 Tide Tide is movement of watermass at a particular depth. To know absolute tide (speed on ground), the following two data are required: 1 Ship’s speed and course based on ground 2 Ship’s speed and course based on measuring layer (A) Absolute tide is, then, given as a difference of these two speed vectors. 2 Absolute Tide = 1 – 2 Layer (A
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Nav Tide Nav-Tide is an absolute movement of watermass at a particular depth, taking speed information from the external navigator (GPS) as a pseudo ground tracking speed. To calculate Nav-tide, the following two data are required: 1 Ship’s speed and course obtained by external navigation equipment (GPS) 2 Ship’s speed and course based on measuring layer (A) Nav-tide is, then, given as a difference of these two speed vectors. 1 2 Absolute Tide = – GPS satellites 1 Nav-aided speed (Pseudo
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1 2 Tide Difference = - (Movement of layer B based on layer A) or = 2 - 1 (Movement of layer A based on layer B) 1 Layer (A) 2 Layer (B) :Base of measurement Figure 5 TIDE, NAV-TIDE & TIDE DIFFERENTIAL Tide (Absolute tide) Absolute tide can be measured in the ground tracking mode. 10 NM (1 hour trip) Start of End of trip trip (Moving at 10 kt on ground) 1 Layer A (Moving at 3 kt on ground) 2 :Base of measurement Fixed Figure 6 Assume that the ship and layer A are moving in the same direction,
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Speed of layer A based on ground (C1) can be calculated as follows: C1 = Vg – Vwa = 10 – 7 = 3 (kt) Nav-Tide (Absolute tide) Absolute tide can be measured in the nav-aided mode. Nav-aided ship’s speed (Vn) is equivalent to ship’s ground tracking speed in the ideal conditions. That is, the nav-tide can be calculated by simply replacing Vg with Vn in the above equation. Tide Differential Tide differential is a relative movement of tides at different depths. It can be measured in the ground trackin
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Assuming that the ship, layer A and layer B are moving in the same direction, and ship’s speeds based on layer A (Vwa) and on layer B (Vwb) are measured as; Vwa = 8 kt (Ship’s speed based on layer A) Vwb = 5 kt (Ship’s speed based on layer B) Tide differential calculations in ground tracking mode As an absolute ship’s speed (Vg) is available in the ground tracking mode, tide speeds of layer A (C1) and layer B (C2) based on ground are calculated as follows: C1 = Vg - Vwa (Speed of layer A based o
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10 NM (1 hour trip) Start of End of trip trip Near- surface 1 2 3 layer Layer A :Base of measurement Layer B Assume that the ship and all measuring layers are moving in the same direction, but at different 1 kt speeds. 2 kt 5 kt Figure 8 7
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[READ THIS FIRST!!] IMPORTANT NOTICE ON TIDE MEASUREMENTS (In the nav-aided mode, tide accuracy depends heavily on gyro accuracy.) SETTING SHIP’S HEADING The CI-80 has the nav-aided mode to measure absolute tides even in deep waters where ground tracking is unattainable. To achieve reliable measurements, however, you must supply accurate heading (gyro) information and ship’s position (or speed/course) data to the CI-80. If you are going to use the nav-aided mode, set the reading of the AD conve
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0 0 10 10 10 10 20 20 20 20 1° -3° 0.2 0.5 kt kt GT Mode NAV Mode GT Mode NAV Mode Figure 10 9
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Features The CI-80 mainly consists of three units: a display unit, a transceiver unit, and a transducer, each compact enough to fit on small boats. The main features of the CI-80 are; • Even in deep waters where ground (bottom) reference is not available acoustically, the CI-80 can provide absolute movements of measuring layers by receiving position (or speed) data from GPS navigator and heading data from gyro compass. It may be used on deep sea fishing boats or on ocean research vessels. • Trip
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SYSTEM OVERVIEW Control Description Display unit (CI-800) Figure 11 Display unit Transceiver unit (CI-810) Figure 12 Transceiver unit 11
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Table 1 Control description Control Description ON Turns the system on/off. OFF Adjusts brilliance of display. Setting can be locked by pushing in control. 0 10 BRLL Alternately selects echo display and course plot display. DISP MODE Selects tracking mode among ground tracking, water tracking, nav aided and automatic selection. MODE (G) (W) (A) Select "T/D" or "NAV" from the item WATER SPEED on the SYSTEM menu. (G) (N) (A) Opens/closes the menu. MENU Select menu. In menu operation, select men
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How to Read the Displays The CI-80 has two display modes: echo display and course plot display. A display may be selected with the DISP MODE key. Echo display Figure 13 Sample echo display 13
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When speed or depth data appears in red… Speed or depth data containing error appears in red. Ships speed Cannot find reference echo in respective tracking mode. Tide speed Cannot find echo in given layer. Set depth Depth set is invalid. In ground tracking mode, depth should be shallower than 7 m, or in the water tracking mode no more 3/4 of seabed depth. Measured speed When measured speed (tide or ship's) is unreliable. Course plot display Figure 14 Sample course plot display NOTE 1: Ship's cou
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NOTE 2: Ship's speed and course displays are update every three seconds, in the default setting. They can be updated every second. For details, consult your dealer. 15
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MAIN MENU DESCRIPTION Most major functions of the CI-80 are carried out through an easy-to-follow menu system. The menu system consists of two main groups of menus: main (operation) and system (testing, calibration). This chapter covers the main menu. For complete menu tree, see page 36. Basic Menu Operation Most major functions of the CI-80 are carried out through an easy-to-follow menu system. Two general types of menus are used: main (operation) and system (testing). Opening/closing the menu:
