G Graphical I Interference M Management S System

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G GraphicalI InterferenceM ManagementS
System
Version 6.3 SRS CD 2006-2
Advanced Features
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Diagram Validation

• GXT file validation On-the-fly validation
• In GIMS 6.x, same validation rules
• Check GXT format compliance
• Ensure diagram correctness
• Ensure data are usable by GIMS other BR
  software

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On-the-fly Validation

• Activated only when a diagram is modified
• Diagram in DB are considered correct
• Allow to transfer diagrams between databases
• Invalid contours shown with dotted and thicker
  line style
• Run validation to get detailed error information

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GXT Validation

• Same rules than on-the-fly validation
• Check format compliance
• Use GXTEdit
• Allows to see warnings and errors
• Import in GIMS use on-the-fly validation
• GIMS 6.x allows to export invalid diagrams !
• Helpful for partial correction in GIMS GXTEdit

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GXT Format Compliance

• Specification in Annex II of Circular Letter CR
  58
• Use GXTEdit or any editor to correct the file

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Diagram Correctness

• Contours crossing
• Use GXTEdit to adjust the points
• Filtering may slightly change contour shape and
  fix the problem when contours are close to each
  other.
• Loops in contours
• Often happens at contour ends
• Filter can help sometimes
• Use GXTEdit
• Open contours with end points not on horizon
• Filtering extend contours
• Use GXTEdit to add points

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Data Correctness for Software (I)

• Too many points
• In theory no reason for limiting the number of
  points
• In practice software uses fixed size buffer to
  store diagram data
• 4000 pts but depends on number of boresights and
  contours
• Use filtering to decrease number of points. Outer
  most contours are not always of use for gain
  interpolation
• Maximum of 99 boresights and 99 contours
• Software limitation

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Data Correctness for Software (II)

• Points too close
• Consecutive points should be at least 1 km away
  from each other
• Use filtering with filter type Remove Close
  Points
• Points not visible
• Filtering will remove invisible points
• Use GXTEdit

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Data Correctness for Software (III)

• Contours crossing in azimuth/elevation
• Gain interpolation works with point coordinates
  in azimuth/elevation from the satellite
• Crossing can occur
• When points are far from each other
• When contours are close to each other
• When contours are close to the horizon
• Use filter to add point
• Full filter or Add Points type

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Crossings in az/el
Before filtering
After filtering
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Elliptical to Shaped Beam
Elliptical beam (-3dB ellipse)
-2, -4, -6, -10, -20 dB contours
Read-only contours Create service area based on a
contour Conversion to shaped beam using copy/paste
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Get Access with MS Access

• GIMS databases are secured
• Ensure access only through applications and
  libraries (like Gimapi32.dll)
• Possibility to get read-only access with guest
  account using MS Access
• Create a shortcut with the following string as
  the Target propertiesltMSAccess
  pathgt\MSACCESS.EXE" /wrkgrp c\br_soft\system32\gi
  ms.mdw
• Use shortcut to open GIMS database and use the
  guest username and guest password.