Customer Service Center

• SimCHAN v3-00 onwards
• GSS6300M
• AGPS Testing that requires specific conditions for
  • Power level settings
  • DOP criteria
  • AWGN considerations
  • GPS Time Assistance

POWER LEVELS

• The power level sliders in the SimCHAN GUI set the power for all satellites of the same type.
  • This means you can’t set different power levels on different satellites of the same type.
• Instead use remote command = POW_LEV, explained in the software user manual, DGP01251AAA

DOP (Start Time / Vehicle Position / Satellite Constellation)

• To achieve the HDOP requirements the satellite constellation, vehicle position and scenario start time must be carefully chosen.
• The vehicle position and start time can be set in the SimCHAN GUI
• The constellation can be loaded via a Yuma file
• However, SimCHAN does not offer any data output to allow you to see the resulting HDOP that is being achieved.
  • The user would have to determine some other method, of their own devise, to work out how the chosen configuration affects the HDOP
  • A GSS6300M Special Scenario could be requested to assist in achieving the correct DOP

AWGN

• If AWGN simply requires consideration of background noise level, this is dominated by thermal noise and is replicated by the simulator RF output (see article FAQ10518)
• Additional interference effects, perhaps like multipath and/or obscurations are not directly supported with SimCHAN
  • A GSS6300M Special Scenario could be requested to assist in creating a scenario with multipath or obscuration effects

GPS TIME ASSISTANCE

• “GPS time assistance accuracy” requires assistance data from a third-party source
• The GSS6300M and SimCHAN are not capable of providing this test parameter directly.