Customer Service Center
Spirent KB Article
Doc ID: SOL13890
Email Article Link
Positioning Application: How to use Pseudorange Ramp toolbar button for RAIM test?
In this article, you can see an example of RAIM test using the Pseudorange Ramp toolbar button and a Septentrio PolarX5 receiver.
For more information on different ways to apply PR ramps in a scenario, please refer to article FAQ12538 to learn about PR Ramps
PosApp all versions (SimGEN, SimREPLAYplus, SimREPLAY)
RAIM test example applying PR ramps by Pseudorange ramp button in a scenario with Septentrio PolaX5 receiver.
Before applying PR ramp, run a scenario, with a receiver connected to the simulator, until the receiver gets a position fix using signals from a minimum of 5 satellites with a satisfactory geometry.
In the PosAPP software
click the Pseudorange Ramp toolbar button
In the Pseudorange Ramps dialog, click "New"
Type in Tx ID (for example GPS 15)
Type in a "Pseudorange change" (for example 1300 m)
Fill in the "Ramp up time" (for example 3 mins)
Repeat steps 3 to 5 for each satellite you want to apply a Pseudoragne ramp to (for example GPS 22 and GPS 29)
In the RxControl Software (normally RAIM is "on")
Use the menu View-Channel table
You can see GPS15, 22,29 being rejected.
If you want to see what happens to the receiver by applying PR Ramp without RAIM "on", then:
In Rx Control Software
Use the menu Navigation-Receiver Operation-Position
In Integrity Tab, Turn off RAIM
In Posapp Software
Run a scenario again.
After a receiver get position fix
Apply PR ramp following steps above
You can see receiver moving far away from reference position
Product : Position Apps,SimGEN,PosApp