| What is a GPS Record and Playback Unit? |
 All Global Navigation Satellite Systems (GNSS), of which the US built and managed Global Positioning System (GPS) is the best known example, work by measuring the transmission-time delay from a satellite to the receiver. With a clear view of the sky and an unobstructed path to multiple satellites a modern GNSS receiver is able to calculate its position rapidly and accurately. However atmospheric propagation effects can alter the speed of the signals to an indeterminate degree, signals can be obscured by buildings or reflected off surfaces such as the sea, all of which will compromise the performance of the receiver, reducing accuracy, extending acquisition time or reducing sensitivity. Thorough evaluation of receiver performance requires that the impact of these various sources of impairment is assessed. An emerging technique for performing this testing is by Recording the RF signal for subsequent Playback in the lab. Click here to continue reading... |
| Spotlight: Spirent GSS6400 Record & Playback Webinar |
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The Right Approach to Record and Playback
Join Spirent for the complementary webinar, Record & Playback for GNSS Testing. Steve Hickling, product manager at Spirent, will address the advantages and highlight the potential pitfalls of the record and playback approach.
Learn about record & playback best practices and get guidance on selecting and using a GNSS signal recorder for testing.
This interactive discussion will illustrate record & playback techniques with examples featuring Spirent's new GSS6400 GNSS Record and Playback System. Register here.
Date: Wednesday 26th January 2011
Time: 12:00 EST
Duration: 45 minutes
Download the Record & Playback eBook here; everything you need to know about record and playback. |
| Testing Modern Radios |
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Solutions for designing Software Defined Radios that employ legacy and modern modulation schemes with frequency hopping techniques
Designers have long sought to improve the performance and resiliency of radio
communications. With the radio frequency (RF) spectrum becoming more crowded and interference more prevalent in recent years, these efforts have become increasingly critical.
Several techniques are now being employed to ensure efficient communications across the chaotic radio spectrum. Click here for a description of the techniques being used.
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