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Modeling GPS Adaptive Nulling Receivers

Modeling GPS Adaptive Nulling Receivers. Ken Sherman (Satellite Software), Haroon Rashid (AGI), Trevor Stief (AGI). SATSOFT. Satellite Software. AGI business partner specializing in antennas Develops antenna modeling software (SATSOFT) Developing a series of antenna plug-ins for stk & ntk

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Modeling GPS Adaptive Nulling Receivers

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  1. Modeling GPS Adaptive Nulling Receivers Ken Sherman (Satellite Software), Haroon Rashid (AGI), Trevor Stief (AGI)

  2. SATSOFT Satellite Software • AGI business partner specializing in antennas • Develops antenna modeling software (SATSOFT) • Developing a series of antenna plug-ins for stk & ntk • www.satsoft.com • Contact Ken Sherman (sales at satsoft dot com)

  3. Overview • Plug-In Architecture • Array Design • PA GUI • Nulling Algorithms • Null Formation • Scenarios • Results • Future Work • Conclusions

  4. Antenna Plug-In Architecture Link Analysis & Reports Receivers, Transmitters & Jammers stk GUI Panel 2D/3D Contours STK Plug-In Analysis & Pattern Computation Plug-In GUI Antenna Geometry Antenna Beamformer Pattern Contours Pattern Cuts

  5. Wide Range of Antennas Supported by Plug-In • Active & passive receiving antennas • Active & passive transmitting antennas • Beam steering and nulling • Arbitrary polarization (LP, CP, etc)

  6. Receiver Equivalent Active Antenna Lossless Antenna  L1 L2 Lr F1, G1 Active Receiving Antenna

  7. Features of Phased Array Plug In • Quickly design arrays for any receiver or transmitter in stk & ntk • Planar, linear, and cylindrical (conformal) array geometries • Circular, elliptical, and polygonal apertures • Shaped beam phase and/or amplitude synthesis • Adaptive nulling • Taylor circular, rectangular, and Baylis low sidelobe aperture tapers • Several element models • Linear & circular polarization

  8. Designing & Analyze the Array Define: • Size & shape of aperture • Number & position of elements • Type of radiating elements • Nulling algorithm, if any Perform: • Static pattern analysis

  9. Phased Array User Interface

  10. Adaptive Nulling Algorithms • LMS steepest descent • Howells-Applebaum • Sample Covariance Matrix Inversion

  11. Forming a Pattern Null

  12. STK Scenarios • SATCOM Link with Jammer on Airplane • GPS receiver with single jammer

  13. Un-Adapted Pattern

  14. Jammer Adapted Pattern

  15. 3D Antenna Pattern

  16. Future Work • Phased array digital beamformer • Phased array interface to future stk/radar module • Reflector model (physical optics) • Wire antenna model (moment method) • Scripting (nulling algorithms, etc)

  17. Conclusions • Flexible antenna plug-in architecture for stk & ntk • New phased array plug-in under development • Improvement of s/n by nulling a jammer • Future work Challenges: • Accurate gain = pattern integration = cpu time • Providing visual feedback • Easy-to-use but comprehensive GUI

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