User's Manual
Table Of Contents
- 0 General
- 1 BASIS SETTINGS TO USE THIS RADAR
- 2 OPERATING INSTRUCTION
- 2.1 Radar Operation
- 2.2 Set to Operation
- 2.3 Display Organization and Submenu Structure
- 2.3.1 Sensitivity Controls
- 2.3.1.1 Gain and Clutter Processing
- 2.3.1.2 Tune
- 2.3.1.3 Gain
- 2.3.1.4 Sea
- 2.3.1.5 Rain Rate
- 2.3.1.6 Automatic Clutter Reduction
- 2.3.1.7 Filtering Rain Clouds FTC
- 2.3.1.8 Search and Rescue Transponder SART ON/OFF
- 2.3.1.9 Pulse Width Selection (only available in Master mode)
- 2.3.1.10 Interference Selection IR ON/OFF
- 2.3.1.11 Echo Expansion EXP. ON/OFF
- 2.3.2 Radar Video Displays
- 2.3.3 Radar Video Settings
- 2.3.4 Navigational Elements MAP, PIL, EBL and VRM
- 2.3.5 Cursor Information
- 2.3.6 Cursor in Park Position
- 2.3.7 Information Panel
- 2.3.1 Sensitivity Controls
- 2.4 Select Target Information TGT INFO
- 2.5 Target Menu
- 2.6 Zone Management
- 2.7 Function Menu
- 2.7.1 Select the Backlight Menu Brightness Control and Color Palette
- 2.7.2 Select T-SCE (ON/OFF)
- 2.7.3 Select Route (Option)
- 2.7.4 Select Zoom Menu
- 2.7.5 Select Sector Blanking (ON/OFF)
- 2.7.6 System Clear
- 2.7.7 Performance Monitor (PMU)
- 2.7.8 Magnetron Current
- 2.7.9 Test Alert
- 2.7.10 Senc Menu
- 2.7.11 Chart Info
- 2.8 Chart Radar Function
- 2.9 Select ARPA Trial Manoeuvre
- 2.10 Sea Scout (Option)
- 2.11 Alarm and Warning messages and handling
- 2.12 Working Around the Radar Antenna
- 3 Theory of Operation
- 4 Index
Synapsis Radar
with Nautoscan NX Pedestal
Operator Manual
Edition July 2015
3-1
4265.DOC020102
3 Theory of Operation
This chapter gives additional information about Radar operation and functions.
It explains terminology and describes a number of effects which have influence
on Radar performance and have to be considered by the operator.
A Radar uses a very high frequency radio wave (microwave) which has similar
properties to those of light regarding straightness and uniform velocity. The
Radar antenna radiates the fan shape fine microwave (fan beam) to the target
just as a search light throws the light beam to the target, and the reflected
microwave from the target returns to the antenna.
The Radar does not use an continuous wave but radiates the wave for a very
short period (approx. 10-6 to 10-8 second .... called pulse) to measure the time
from when the wave is radiated till the reflected wave returns to the antenna. In
addition, with rotation of the antenna at a constant speed, the fan shape radio
wave radiated from the antenna scans around 360 - with the antenna at its
center - in order to detect the object.
3.1 Radar Plotting Terminology
• Bearing (AZIMUTH)
The horizontal direction of one point from another point, expressed as
the angle in the horizontal plane between a reference line and the
horizontal projection of the line joining the two points.
− TRUE Bearing > Reference is true north
− RELATIVE Bearing > Reference is own ship’s heading
• Target Speed
− TRUE > Actual speed made good by target.
− RELATIVE > In relation to own ship’s movement
• Target Course
− TRUE > Direction of target movement referenced to true north.
− RELATIVE > Direction of target movement referenced to own ship bow.
• Closest Point of Approach (CPA)