7-3
Section 7 True and False Echoes on Display
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付録
7.2 Intensity Reflected from the Target
The signal intensity reflected from a target depends not only on the height and size of the target but
also on its material and shape. The echo intensity from a higher and larger target is not always higher
in general.
In particular, the echo from a coast line is affected by the geographic conditions of the coast.
If the coast has a very gentle slope, the echo from a mountain of the inland like the figure below
appears on the radar display. Therefore, the distance to the coast line should be measured carefully.
The next table shows the relation between the target detection range and the radar reflection
cross-sectional area (RCS) with regard to the type and the height of the target in a situation in which
the weather is good, the sea state is calm and the radio wave propagation is normal. As revealed by
this table, even on the same sea shore line, detection range greatly differs depending on the height of
the target from the surface of the sea. Furthermore, because the target detection range is greatly
influenced by the shape and material of the target and environmental conditions, such as the sea state,
weather, and radio wave propagation, caution should be taken when detecting range of target.
Relation between Type and Height of Target and Detection Range and RCS
Type of target
Height from
sea surface
(m)
Detection range (NM)
RCS (m²)
X band
S band
X band S band
Sea shore line
60
20
20
50,000 50,000
Sea shore line
6
8
8
5,000
5,000
Sea shore line
3
6
6
2,500
2,500
SOLAS target ship (>5000GT)
10
11
11
50,000 30,000
SOLAS target ship (>500GT)
5
8
8
1,800
1,000
Small boat with IMO standard
compatible radar reflector
4
5.0
3.7
7.5
0.5
Marine buoy with corner reflector
3.5
4.9
3.6
10
1
Standard marine buoy
3.5
4.6
3.0
5
0.5
10-metre small boat without radar
reflector
2
3.4
3.0
2.5
1.4
Waterway location beacon
1
2.0
1.0
1
0.1
Memo
Detection range shown in the above table may greatly decrease depending on the shape of the
target, sea state, weather and radio wave propagation conditions.
Mountain displayed
on the radar display
Sea shore line not displayed
on the radar display.
HL
Sea Shore Line Not Displayed on the Radar Display
Содержание JMR-5410-4X
Страница 2: ......
Страница 22: ...xx NQE 3167 Power Control Unit NCT 4106A NSK Unit NBA 5111 Rectifier Warning Label Warning Label Warning Label ...
Страница 25: ...xxiii NKE 2255 7 9 6HS Scanner Unit Warning Label ...
Страница 27: ...xxv NKE 2103 4 4HS Scanner Unit NKE 2103 6 6HS Scanner Unit NKE 2255 7 9 6HS Scanner Unit ...
Страница 54: ...Contents 20 ...
Страница 68: ...Section 1 Overview 1 14 Outline Drawing of Radar Antenna NKE 2632 A ...
Страница 70: ...Section 1 Overview 1 16 Outline Drawing of Radar Antenna NKE 2043 NKE 2043 ...
Страница 72: ...Section 1 Overview 1 18 Outline Drawing of Radar Antenna NKE 2103 4 4HS ...
Страница 74: ...Section 1 Overview 1 20 Outline Drawing of Radar Antenna NKE 2255 7 ...
Страница 76: ...Section 1 Overview 1 22 Outline Drawing of Radar Antenna NKE 2255 6HS ...
Страница 78: ...Section 1 Overview 1 24 Outline drawing of 19inch Display NWZ 214 NWZ 214 ...
Страница 80: ...Section 1 Overview 1 26 Outline Drawing of Process Unit NDC 1678 NDC 1678 ...
Страница 82: ...Section 1 Overview 1 28 Outline Drawing of Trackball Operation Unit NCE 5605 Option ...
Страница 84: ...Section 1 Overview 1 30 Outline Drawing of Junction Box NQE 1143 ...
Страница 86: ...Section 1 Overview 1 32 Outline Drawing of 19inch Desktop Frame CWB 1659 ...
Страница 88: ...Section 1 Overview 1 34 Outline Drawing of Interswitch Unit NQE 3141 8A Option ...
Страница 126: ......
Страница 214: ...Section 4 Range and Bearing Measurement Methods 4 32 ...
Страница 244: ...Section 5 Basic Operation of the Radar 5 30 ...
Страница 324: ...Section 8 Monitoring a Dragging Anchor 8 8 ...
Страница 374: ...Section 11 Setting up Screen View 11 20 ...
Страница 380: ...Section 12 Setting up Alerts 12 6 Polygon tab Set a polygon alarm issuing range This function cannot be used now ...
Страница 520: ...Section 15 Maintenance Inspection 15 70 ...
Страница 546: ...Section 16 Failures and After Sale Services 16 26 ...
Страница 590: ...Appendix A Radar Antenna Display Unit Block Diagrams A 8 A 1 8 NKE 2255 7 9 6HS ...
Страница 592: ...Appendix A Radar Antenna Display Unit Block Diagrams A 10 A 1 10 NKE 2063A ...
Страница 596: ...Appendix A Radar Antenna Display Unit Block Diagrams A 14 A 2 3 NCE 5794 operation unit ...
Страница 622: ...Appendix D Menu List and Materials D 8 Tools VHF Call VHF1 Call VHF2 Call VHF3 Call ...
Страница 687: ......