Marine Radar Theory4: WHAT IS TRACE

TRACE IN MARINE RADAR :

- Once receiver receive echo from target same will be plotted on PPI.

- On PPI  a bright spot is made to move in radial path from the centre of PPI to circumference of PPI.

- The visible radial line created by the moving spot from centre of PPI  to circumference of PPI is called Trace.

-One TRACE is created for every pulse send out through the scanner.

- So that the number of trace create per second is equal to PRF [ Pulse repetition  frequency ] .

WHILE LOOKING AT  MARINE RADAR PPI AN OBSERVER CAN SEE A RADIAL LINE GOING FROM PPI CENTRE  TOWARD THE CIRCUMFERENCE OF PPI , THERE ARE TRACE.                 

Marine Radar Theory 3: TRANSMITTER & RECEIVER

THE TRANSMITTER :

- Transmitter sends out the power full electromagnetic energy called PULSE, through the scanner at a specific number of time per second called the PRF [ Pulse repetition frequency ] or PPR [ Pulse Recurrence rate].
-These pulse travel at a speed of light [ 300 meter per micro second ]
-Pulse hit the target at sea and reflect back to scanner as ECHO.




THE RECEIVER :


- Receiver receive the echo and make it appear on radar PPI as a bright spot called BLIP.