swra169 - Design Note DN018 SWRA169 Page 1 of 14 Range...

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Unformatted text preview: Design Note DN018 SWRA169 Page 1 of 14 Range Measurements in an Open Field Environment By Tor-Inge Kvaksrud Keywords • Friis Equation • Ground Model • Range • Sensitivity • Transmission Budget 1 Introduction Range is one of the most important parameters of any radio system. Data- rate, output power, receiver sensitivity, antennas and the intended operation environment all influence the practical range of the radio link. An open field is one of the simplest and most commonly used environments to do RF range tests. However here there are important effects to consider; failing to address these often results in the test results being misinterpreted. This design note addresses non-ideal effects to consider when doing open field range measurements. In this note “open field” refers to a large open area without any interfering radio sources, i.e. a soccer field. Design Note DN018 SWRA169 Page 2 of 14 Table of Contents KEYWORDS................................................................................................................................1 1 INTRODUCTION...............................................................................................................1 2 ABBREVIATIONS.............................................................................................................2 3 PATH LOSS AND PROPAGATION THEORY.................................................................3 3.1 FRIIS-EQUATION ..........................................................................................................3 3.2 LINK BUDGET...............................................................................................................3 3.3 GROUND REFLECTION (2-RAY) MODEL..........................................................................4 3.3.1 Reflection Coefficient ........................................................................................................ 4 3.4 NOISE .........................................................................................................................6 4 SUMMARY........................................................................................................................8 5 REFERENCES..................................................................................................................9 6 APPENDIX A ..................................................................................................................10 6.1 FRIIS EQUATION FOR FREE SPACE...............................................................................10 6.2 FRIIS EQUATION WITH GROUND REFLECTION...............................................................11 6.2.1 Validating the Ground Reflection Model......................................................................... 12 6.2.2 The Open Test Field ........................................................................................................ 13 7 GENERAL INFORMATION ............................................................................................14GENERAL INFORMATION ....
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This note was uploaded on 10/16/2009 for the course EL el6303 taught by Professor Prof during the Spring '09 term at NYU Poly.

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swra169 - Design Note DN018 SWRA169 Page 1 of 14 Range...

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