Triton Isis Instrukcja Użytkownika Strona 202
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Oceniono. / 5. Na podstawie oceny klientów
June 2004 Isis® Sonar User's Manual, Volume1 188
stored and read by Isis as beam patterns from which compensations are
created while Isis is running. Refer to Appendix B for a description of the
BAC file format.
If no calibration patterns are available, Isis can derive an empirical BAC
from statistics collected over at least several hundred pings. This is
generally the approach taken since transducer beam patterns are rarely
available.
If the empirical approach is to be taken, select a featureless piece of
seafloor within the survey area with a well-known slope where at least 200
pings can be or have been collected. The greater the number of pings used,
the more successful the compensation will be.
When the statistics are being collected, the towfish altitude should be varied
over the entire range of altitudes expected for the survey. This will help Isis
to eliminate the effect of grazing angle intensity variations from the beam
angle compensation statistics. It is also helpful to collect statistics at
altitudes lower than the expected minimum for the survey in order to
increase the information available at high beam angles. It is very important
that the towfish altitude is well known during the collection of statistics and
during the entire survey for which beam angle compensation is applied.
9.8.3 Grazing Angle Compensation
At far range, the angle at which the acoustic energy strikes the seafloor
shrinks toward zero. As this grazing angle gets smaller, less energy is
scattered back in the direction of the sonar, thereby creating another across-
track intensity variation. By collecting statistics over well-known and well-
behaved seafloor, Isis can derive a grazing angle compensation for each
bottom type and general track heading in a given survey. You can then load
the GAC from a file or collect new statistics for each run.
When calculating a GAC from collected statistics, select a featureless piece
of seafloor of known slope where at least 200 pings can be collected. As
with statistics collection for BAC, the towfish altitude should be varied
between the estimated upper and lower altitude limits for the survey. This
will allow the most thorough sampling of grazing angle independent of beam
angle.
It is also helpful to collect statistics at altitudes lower than the expected
minimum for the survey in order to increase the information available at low
grazing angles. It is very important that the towfish altitude is well-known
Chapter 9: Using the Tools Menu
- ISIS SONAR® 1
- Copyright Notice 2
- Safety Precautions 3
- Preface: 6
- Using This Manual 6
- Chapter 1 Isis Overview 15
- 1.2 Theory of Isis Operation 17
- 1.2.2 Data Acquisition 18
- 1.2.6 Hardcopy Records 20
- 2.5 Keeping a Log 28
- 3.1 Playback 37
- Backwards) 39
- 3.2 Working with SCSI Tape 46
- 3.2.3 Features 47
- 3.2.5 Recording to Tape 49
- 3.2.6 Playing Back from Tape 50
- 3.3 Stop 59
- 3.4 Pause 60
- 3.5 Scroll Direction 60
- 3.6 Isis Explorer 60
- 3.6.1 Isis Explorer Menus 61
- 3.7 Go To 66
- 3.7.4 Time 67
- 3.7.5 Location 67
- 3.7.6 KP 69
- 3.7.7 Event 69
- 3.7.8 Next File in Time 69
- 3.8 Page Up 70
- 3.9 Page Down 70
- 3.10 At End of File 70
- 3.11 Print 71
- 3.12 Save Image 71
- 3.13 Exit 72
- 4.1 Sonar Setup 73
- 4.1.2 Advanced Record Setup 79
- 4.2 Serial Port Setup 81
- 4.3 File Format Setup 87
- 4.4 Start Recording 90
- Chapter 5 Printing in Isis 92
- 9.8, ‘Beam 101
- Chapter 5: Printing in Isis 104
- Figure 6-1: Configure Menu 107
- 6.3 Audible Alarms 110
- Display 112
- (Slidebar) 122
- 6.11 Primary Sensor 123
- Figure 7-1: The Color menu 129
- 7.1 Palette 130
- 7.2 Grid Colors 132
- Figure 8-1: The View Menu 133
- 8.1 Scale Lines 134
- (10.7.2 ‘Bottom Track 136
- 8.3 Overlay 137
- 6.10, ‘Cue Boxes 138
- (Record/Playback),’ 138
- 8.4 Downsample 139
- 8.5 Speed 144
- 8.6 Heading 145
- 8.7 Layback 145
- 8.8 Bearing to Point 157
- 8.9 Mark Event 158
- 8.10 Saved Raw Serial Data 158
- Figure 9-1: The Tools menu 160
- 9.1 Target 161
- 9.2 Target Setup 161
- Appendix E, ‘Using the 162
- Target Utility’ 162
- More Options) 165
- Polygons 170
- 9.3.7 Saving Tracked Points 172
- Polygons dialog 176
- 9.4 Coverage Map and Mosaic 177
- 9.5 Real-Time BathyPro Map 190
- 9.6 Com Port Test 192
- 9.7 Spatial Filter 192
- 9.8.1 Overview 201
- ‘Parts of the Dialog Box 205
- Common to All Levels’ 205
- 9.8.5.1 Do it Button 209
- 9.9 ASCII Report 210
- 9.10 Output Telemetry 214
- 9.11 Output XYZ 219
- 9.12 Snip File 222
- 9.13 Track Pipeline 222
- ‘To pick 233
- ‘To turn 236
- 9.14.4 and Table 9-10 237
- 9.14.6 Operational Notes 242
- Figure 10-1: The Window menu 243
- 10.1 Waterfall 244
- 10.1.1 Down 247
- 10.1.2 Across 247
- 10.2 Wiggle 248
- 10.2.2 Wiggle in 3-D 251
- 10.3 Signal 252
- 10.3.2 FFT 254
- 10.4 Multibeam Bathymetry 255
- ‘10.7.8 Bathymetry 256
- Confidence’ 256
- 10.4.2 Scrolling 3D 257
- 10.4.3 True 3-D (Open GL) 258
- 10.4.4 Waterfall Intensity 262
- 10.5 Echo Strength 265
- 10.6 Graph 267
- 10.6.2 Navigation 268
- 10.6.3 Telemetry 269
- 10.6.4 Ship and Towfish 270
- 10.6.5 Auxiliary 271
- 10.6.6 Magnetometer 272
- 10.6.7 Computed CTD 273
- 10.6.8 Raw CTD 274
- 10.6.9 Set Scaling Ranges 275
- 10.7 Status and Control 278
- 10.7.2 Bottom Track and TVG 282
- Options 284
- (button) 284
- TVG (button) 284
- DC Offset 287
- (slider bar) 287
- Balance 287
- (check box) 287
- 10.7.4 Sensors 288
- 10.7.5 Towfish Status 290
- 10.7.6 Banner 291
- 10.7.7 Clock Times 292
- 10.7.8 Bathymetry Confidence 293
- 10.8 Child Windows 294
- 10.9 Orientation 295
- 10.10 Close All 295
- 10.11 Layout 295
- 10.13 Windows Setup 296
- 10.12 Reset Windows 296
- Figure 11-1: The Help menu 297
- 11.1 Get Info 299
- 11.2 About Isis 299
- 11.3 Contents 300
- 11.4 Search for Help on 300
- 11.5 How to Use Help 300
- Chapter 12 Maintenance and 301
- Troubleshooting 301
- 12.2 Troubleshooting 302
- 12.3 Hardware Diagnostics 302
- 12.3.2 DSP Board 303
- 12.3.3 Graphics Processor 303
- 12.3.4 SCSI Controller 303
- 12.3.5 Trackball 303
- 12.4 Emergency Boot Disk 306
- 12.5 Technical Support 306
- 12.6 Warranty Repair 308
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