UAT/JTIDS Interference Against DME
UAT/JTIDS Interference Against DME
UAT/JTIDS Interference Against DME
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<strong>UAT</strong>/<strong>JTIDS</strong> <strong>Interference</strong> <strong>Against</strong> <strong>DME</strong><br />
Albert B. Muaddi<br />
The Johns Hopkins University<br />
Applied Physics Laboratory<br />
Laurel, MD<br />
albert.muaddi@jhuapl.edu<br />
240.228.5307<br />
The Johns Hopkins University Applied Physics Laboratory (JHU/APL) <strong>UAT</strong>-WP-7-12<br />
<strong>UAT</strong>-WP-7-12<br />
25 September 2001
Introduction…<br />
Objective<br />
• To assess the interference conditions against which <strong>DME</strong> must operate<br />
Scenario<br />
• <strong>UAT</strong> air scenario is Core Europe (2015)<br />
• <strong>UAT</strong> ground interference generated from APL ground model<br />
• <strong>JTIDS</strong> scenario is Baseline B<br />
• <strong>DME</strong> Channel is 978 MHz<br />
• Aircraft at 40,000 ft<br />
Assumptions<br />
• <strong>DME</strong> receive filter 3-dB bandwidth is 500 kHz and 20-dB bandwidth is 1 MHz<br />
Approach<br />
• Estimated CDF of received interference level using a 30-second observation<br />
interval of <strong>UAT</strong> and <strong>JTIDS</strong> interference<br />
The Johns Hopkins University Applied Physics Laboratory (JHU/APL) <strong>UAT</strong>-WP-7-12
Results<br />
CDF<br />
1<br />
0.9<br />
0.8<br />
0.7<br />
0.6<br />
0.5<br />
0.4<br />
0.3<br />
0.2<br />
0.1<br />
0<br />
-200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0<br />
The Johns Hopkins University Applied Physics Laboratory (JHU/APL) <strong>UAT</strong>-WP-7-12<br />
CDF of Received <strong>Interference</strong> Level for Core Europe<br />
<strong>Interference</strong> (dBm)<br />
<strong>DME</strong> MOPS<br />
Sensitivity<br />
<strong>UAT</strong> Only<br />
<strong>UAT</strong> and <strong>JTIDS</strong>
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