Radar – Radio Detection and Ranging.
Principle: it Works on Echo Principle (Echo ranging by radar) which is based on time interval between the transmission of an EM pulse into the environment and reception of its echo.
- Instead of Sound wave it uses Radio waves.
- Radar transmission causes an electro-magnetic vibration which travels through air @300 m/per micro sec. [1,000,000 = 1 Sec]
|· X Band 3cm, 9 GHZ||· S Band 10 cm, 3 GHZ|
|· Can detect SART||· Better Target detecting in RAIN|
|· In fair weather target will show better||· Better for long range detection (radar horizon greater than 9 GHZ|
|· For high discrimination, good sensitivity and tracking performance.||· Good sea clutter response, tgt less likely to be hidden.|
|· Better for and Rain clutter.|
|· Short Antenna||· Large Antenna|
Carriage Requirement: Min Radar/ARPA requirements [SOLAS Ch 5 – Annex 16]
|Gross Tonnage||9 GHZ X Band||3 GHZ S Band||EPA||ATA||ARPA|
|300 – 500||1||1|
|> 500 – < 3000||1||1|
|3000 – 10000||1||1*||2|
* Can be 9 GHZ, if administration consider it appropriate.
– MCA require reason why 3 GHZ Radar cannot be carried.
** Instead of APA it can be 2nd ARPA.
|Size of Ship||< 500 GT||500 < 10000 GT ( HSC < 10k GT)||All Ships 10000 GT and above|
|Min ops display area||180 mm||250 mm||320 mm|
|Min Display area||195 mm x 195 mm||270 mm x 270 mm||340 mm x 340 mm|
|Auto ACQ of target||–||–||Yes|
|Min ACQ Radar target cap||20||30||*40|
|Min Activated AIS tgt cap||20||30||40|
|Min Sleeping AIS tgt cap||100||150||200|
*Solas 22.214.171.124 Atleast 20 target can be acquired both manually ???