martes, 20 de mayo de 2008

RADAR

The word RADAR is belived to has been derived from the phrase RADIO DETECTION AND RANGING , short radio waves, like acoustic waves, are reflected by objects that come in their way. Onboard a ship the radar has two main tasks:

  1. To function as an aid to prevent collisions, as with the help of radar one can "see" in fog and darkness.
  2. To assist in the navigation, particulary at landfalls and when navigating in coaste waters.
RADAR SCAN: Is one complete 360 degrees rotation of antenna (during one scan normally several thousand sweeps are generated and trasmitted).

RADAR SWEEP: is the transmition of one radar pulse only.


RADAR MAIN PARTS


  1. Antenna. Transmiter with magnetron modulator and trigger.
  2. Amplifier.
  3. Equalizer and video amplifier.
  4. Display unit.
  5. Power supply with power transformer.

    Note: It is not necessary for the operator to know all the details about each radar component. A basic understanding of how a radar works, its capabilities and limitations is minimun requirement

RADAR EQUIPMENTS CONTROLS


Alineation (heding line)

Calibration (gain, tune, brill

Anticlutter (rain-sea)

EBL (Electronic Bering Line)

VMR(Variable Range Mark)

Rings

Indezation