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ADVANCED TECHNIQUES

ADVANCED TECHNIQUES. Antenna Phase Patterns, Offsets and Switching. Advanced Antenna Controls. Antenna Phase Pattern Antenna level pattern already covered Similar principles Antenna Offsets Antenna positioned away from vehicle CofG Antenna Switching File

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ADVANCED TECHNIQUES

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  1. ADVANCED TECHNIQUES Antenna Phase Patterns, Offsets and Switching

  2. Advanced Antenna Controls • Antenna Phase Pattern • Antenna level pattern already covered • Similar principles • Antenna Offsets • Antenna positioned away from vehicle CofG • Antenna Switching File • Enable multiple patterns and/or offsets during scenario

  3. to receiver Signal Phase • Incident signal falling on antenna surface • Signal ‘collected’ to single point for transmission to receiver • Take example of simple patch antenna • Helixial coil focussed to central transmission line • Signal component incident on edge travels further than signal component incident at centre • Additional path length travelled = signal components not in perfect phase • Out of phase components contribute to signal degradation • Use Antenna Phase Pattern to simulate these effects

  4. Antenna Patterns • In order to access antenna patterns in SimGEN • Select Vehicle->Antenna->Antenna pattern control • There are 2 options to specify antenna patterns within SimGEN: • Level Pattern – (Covered earlier) • Phase Pattern • Click “Enable phase patterns” • Double-Click “Phase pattern file”

  5. Phase Pattern Editor • Same method for editting the phase pattern as per antenna level pattern editor • Pattern instead represents signal phase offsets NOT signal gain levels

  6. Antenna Offsets • Antenna positioned wrt vehicle body axis • Default set-up • Antenna coincident with vehicle CofG [0,0,0] • Antenna boresight at 90o elevation [0,0,0]

  7. Antenna Offsets • Antenna can be positioned ‘away’ from vehicle CofG • Particularly of benefit when simulating vehicle with multiple antennas • Example : aircraft with antennas at each wing-tip, tail and nose = navigation system can use GPS for attitude monitoring • Example Offset • Position offset 2m in body y-axis [0,2,0] • Angle offset 90o rotation along y-axis [0,90,0]

  8. Antenna Offsets • Antenna can be positioned ‘away’ from vehicle CofG • Particularly of benefit when simulating vehicle with multiple antennas • Example : aircraft with antennas at each wing-tip, tail and nose = navigation system can use GPS for attitude monitoring • …and so on….

  9. Antenna Offsets File • Select Vehicle->Antenna->Options->Offsets file • Set offset in metres along • X = positive toward vehicle front • Y = positive toward vehicle right-side • Z = positive toward vehicle bottom • Set offset in degrees • Heading = rotate in z-axis • Elevation = rotate in y-axis • Bank = rotate in x-axis

  10. Antenna Switching Enable multiple antenna patterns and offsets during scenario • Upto four phase and level patterns • Unlimited offsets • Select “Switching File” in “Antenna pattern control” • Ensure required antenna patterns enabled also • Time-ordered sequence of events

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