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TAG: simulator

photo: Lukasz Bonenberg and Craig Hancock

On the Edge: Tracking, Testing

November 1, 2010

One-hundred-twenty meters of test track, designed for repeatable dynamic position testing, run along the roof of the new Nottingham Geospatial Building at the University of Nottingham, UK. The figure-eight track provides an optimal controlled environment with test equipment aboard a remote-controlled, multi-sensor 7¼-inch gauge locomotive platform with a top speed of 7 kilometers per hour, a dedicated power supply, and five antenna mounts. Simulation of the track using Spirent GSS8000 hardware (GPS and Galileo) provides additional planning and testing capacity.


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This article is tagged with , , , , , and posted in Transportation
Figure 2. GPS is visible in the spectrum only if a narrow resolution bandwidth is used. This spectrum was obtained with a center frequency of 1575.42 MHz, a frequency span of 4 MHz, a resolution bandwidth of 10 Hz, root-mean-square averaging with 20 averages, and a reference level of 250 dBm.

Innovation: Record, Replay, Rewind

October 1, 2010

Testing GNSS Receivers with Record and Playback Techniques
Is there a way to perform repeatable tests on GNSS receivers using real signals? This month’s column looks at how to use an RF vector signal analyzer to digitize and record live signals, and then play them back to a GNSS receiver with an RF vector signal generator.


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This article is tagged with , , and posted in From the Magazine, Innovation, OEM
Image: GPS World

GNSS Receiver Evaluation

January 1, 2009

This article addresses how best to quantify “which navigation system performs best” in a realistic testing scenario. The methodology focuses on land vehicles navigating in urban environments, but applies equally well to pedestrian navigation and can be adapted for testing assisted-GNSS implementations. During a drive test, the truth-reference system and RF recording system log samples to disk, with no need for the receivers under test to be included during the actual drive.


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This article is tagged with , , , , , , , , , , and posted in Mobile, Transportation
Image: GPS World

Spirent Intros Customizable Software for GPS Test, Simulation

June 1, 2007

Navigation and positioning test system supplier Spirent Communications this week introduced a software suite for the STR4500 GPS simulator, enabling users to generate their own test cases based on motion data that fits their specific requirements, the company said.


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This article is tagged with , , and posted in OEM
Figure 1: GPS signal reception at GEO and HEO orbital altitudes.

Innovation: Spacecraft Navigator

April 1, 2006

Autonomous GPS Positioning at High Earth Orbits
To initially acquire the GPS signals, a receiver also would have to search quickly through the much larger range of possible Doppler shifts and code delays than those experienced by a terrestrial receiver.


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This article is tagged with , , , , , and posted in Innovation, OEM
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