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TRACKPOINT 3
OPERATION
3-55
3.4.1
TRANSPONDER MODE
Acoustic Transponder Mode
To establish tracking in the Transponder mode, you must have the proper interrogation trans-
ducer and transponder(s) must be operational and in the water.
NOTE:
The interrogation transducer inside the Model 4610B hydrophone has an optimal fre-
quency range of 17 to 20 kHz.
From the Beacon dialog box select the SETUP tab and then select Active target. Select the target
symbol that you want the target to be represented by. Enter a name for the target. From the Bea-
con ACOUSTIC PARAMETER Tab set target type to Transponder, assign a Receive Frequency,
Burst Turn Around Time, Interrogation Frequency, Interrogation Interval and Pulse Width. (This
information is found the Multibeacon Label, 4330X, 435X) Select Trigger source, internal or exter-
nal. From the DEPTH tab select depth mode or enter in depth manually.
Interrogation Interval for a transponder should not be less than 2 seconds; most transponders
have a 1.5- to 1.75-second lock-out time built in to prevent interrogation echoes from retriggering
the transponder. If interrogating two transponders at different frequencies then it’s possible to de-
crease the Interrogation Interval to less than two seconds as the Interrogation Interval for a single
target will be the total of the intervals. E.g., interrogate #1 at 17kHz every 1.5 seconds and #2 at
19kHz every 1.5 seconds, the sequence interval for the two targets is 3.0s which is still greater
than the lockout time of the transponders. Also keep in mind that when using telemetering trans-
ponders the second (telemetry) reply may come in up to one second later than the primary (navi-
gation) reply. Increase Interrogation Interval accordingly.)
NOTE:
With ORE Model 4330 series of transponders, pulse widths of less than 5 msec may
not properly interrogate the transponder. For Model 4350 transponders use a pulse
width of 10 ms.
At a XMIT INTERVAL of 2 seconds, a transponder turnaround time of 15 ms and a speed of sound
input of 1500 meters/second the maximum range the system could track the transponder would be
about 1400 meters. [(1500m/s * (2s - .015s)) / 2 = 1489 m] If a telemetry transponder were used
at its maximum range (telemetry delay of 1 second from primary reply) then the maximum range
would be reduced further to about 700 meters. [(1500m/s * (2s - 1s - .015s)) / 2 = 738.75m]
Input Speed Of Sound
The correct speed of sound in the water column between the transponder and the hydrophone
must be entered for accurate tracking in the transponder mode. From the Project Tree select
“Acoustic data”. Input the sound speed in meters per second or feet per second or yards per sec-
ond, depending on the current unit of measure.
The speed of sound in the water column is used to determine the transponder range. The average
water column temperature is usually different than near-surface temperature (the temperature
Содержание TRACKPOINT 3 4211A
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Страница 13: ...PRECAUTIONS viii ...
Страница 14: ...SECTION ONE GENERAL INFORMATION ...
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Страница 18: ...TRACKPOINT 3 GENERAL INFORMATION 1 3 TRACKPOINT 3 CONSOLE FRONT VIEW FIGURE 1 1 ...
Страница 20: ...TRACKPOINT 3 GENERAL INFORMATION 1 5 TRACKPOINT 3 SYSTEM COMPONENTS FIGURE 1 3 ...
Страница 21: ...TRACKPOINT 3 GENERAL INFORMATION 1 6 FIGURE 1 4 ...
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Страница 28: ...SECTION TWO INSTALLATION ...
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Страница 35: ...TRACKPOINT 3 INSTALLATION 2 6 FIGURE 2 3 ...
Страница 38: ...TRACKPOINT 3 INSTALLATION 2 9 MODEL 4740A INSTALLATION FIGURE 2 5 ...
Страница 39: ...TRACKPOINT 3 INSTALLATION 2 10 FIGURE 2 6 C A U T I O N ...
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Страница 62: ...SECTION THREE OPERATION ...
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Страница 177: ...SECTION FOUR PRINCIPLES OF OPERATION ...
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Страница 186: ...TRACKPOINT 3 PRINCIPLES OF OPERATION 4 8 TRACKPOINT BLOCK DIAGRAM FIGURE 4 3B ...
Страница 189: ...SECTION FIVE MAINTENANCE ...
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Страница 193: ...TRACKPOINT 3 MAINTENANCE 5 1 DSP CARD PROGRAMMING MODE JUMPER FIGURE 5 1 ...
Страница 201: ...APPENDIX A CARE OF CABLES ...
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Страница 205: ...APPENDIX B STATIC DISCHARGE ...
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Страница 209: ...APPENDIX C WARRANTY ...
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Страница 213: ...APPENDIX D DRAWINGS ...
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