Bedienungsanleitung Furuno 1622 (Seite 25 von 35) (Englisch)

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Shadow sectors

Funnels, stacks, masts, or derricks in the path of

the antenna block the radar beam. If the angle

subtended at the antenna is more than a few

degrees, a non-detecting sector may be

produced. Within this sector targets can not be

detected.

Radar

antenna

Radar

mast

Shadow sector

Figure 2-5 Shadow sectors

2.3 SART (Search and Rescue

Transponder)

Note: The SART information below is excerpted

from IMO SN/Circ 197 Operation of Marine

Radar for SART Detection.

A Search and Rescue Transponder (SART)

may be triggered by any X-Band (3 cm) radar

within a range of approximately 8 nm. Each

radar pulse received causes it to transmit a

response which is swept repetitively across the

complete radar frequency band. When

interrogated, it first sweeps rapidly (0.4 µs)

through the band before beginning a relatively

slow sweep (7.5 µs) through the band back to

the starting frequency. This process is repeated

for a total of twelve complete cycles. At some

point in each sweep, the SART frequency will

match that of the interrogating radar and be

within the pass band of the radar receiver. If the

SART is within range, the frequency match

during each of the 12 slow sweeps will produce

a response on the radar display, thus a line of

12 dots equally spaced by about 0.64 nautical

miles will be shown.

When the range to the SART is reduced to

about 1 nm, the radar display may show also the

12 responses generated during the fast sweeps.

These additional dot responses, which also are

equally spaced by 0.64 nm, will be interspersed

with the original line of 12 dots. They will appear

slightly weaker and smaller than the original

dots.

9500 MHz

9200 MHz

Radar antenna

beamwidth

Screen A: When SART

is distant Screen B: When SART

is close

Lines of 12 dots

are displayed in

concentric arcs.

Echo of SART

Position of

SART

Own ship's

position Own ship's

position

SART mark

length

Radar receiver

bandwidth

Sweep time

7.5 µs 95 µs

Sweep start High speed sweep signal

Low speed sweep signal

24 NM 1.5 NM

Position of

SART

Echo of

SART

Figure 2-6 Appearance of SART signal

on the radar display

General procedure for detecting

SART response

1. Use the range scale of 6 or 12 nm as the

spacing between the SART responses is

about 0.6 nm (1125 m) to distinguish the

SART.

2. Turn off the automatic clutter suppression.

3. Turn off the Interference Rejector.

General remarks on receiving SART

SART range errors

When responses from only the 12 low frequency

sweeps are visible (when the SART is at a

range greater than about 1 nm), the position at

which the first dot is displayed may be as much

as 0.64 nm beyond the true position of the

SART. When the range closes so that the fast

sweep responses are seen also, the first of

these will be no more than 150 meters beyond

the true position.

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