Akshay Kumar, Steven Ellingson

Antenna Performance in LMR Systems Using PL Tone Analysis

• Broschiertes Buch

Produktbeschreibung

The in situ or on-site measurement of antenna performance is very challenging in analog Land Mobile Radio (LMR) FM systems. It turns out that the conventional antenna gain measurement techniques are hard and also not quite relevant for understanding the in situ performance. In this work, we present a a novel approach for directly measuring the in situ performance of antennas in analog LMR systems.The procedure involves receiving an FM signal simultaneously using the antenna under test (AUT) and a reference antenna. Both received signals are demodulated to audio using separate but identical receivers. Then a convenient method for characterizing the audio signal quality is to analyze the private line (PL) tone. The PL tone signal-to-noise ratio (SNR) is calculated by measuring the power of the tone relative to the sub-audio noise power. The PL tone SNR for both antenna systems is compared as it provides a "bottom line" evaluation of the antenna performance. The audio SNR can also be mapped to RF SNR using a theoretical method. From simulation and experimental studies, we conclude that the estimate RF SNR is within 0.5 dB of the actual value for RF SNR values between +3 and +36 dB.

Produktdetails

• Verlag: LAP Lambert Academic Publishing
• Seitenzahl: 92
• Erscheinungstermin: 9. April 2014
• Englisch
• Abmessung: 220mm x 150mm x 6mm
• Gewicht: 155g
• ISBN-13: 9783659527173
• ISBN-10: 3659527173
• Artikelnr.: 52672002

Autorenporträt

Akshay Kumar: PhD Candidate, Electrical Engineering, Virginia Tech., Blacksburg (VA). Graduate Research Assistant (GRA) at Hume Center for National Security and Technology, Virginia Tech. Previously GRA at [e-mail]. Steven W. Ellingson: Associate Professor, Dept. of Electrical and Computer Engineering, Virginia Tech., Blacksburg.