Transcription of HF Radio Direction Finding - G4AXX
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HF Radio Direction Finding - G4AXX
HF Radio Direction Finding Dr. David Sadler 25th February 2010. 1 Roke Manor Research Ltd a Siemens Company Contents 1. Overview of HF DF. 2. Traditional approaches to DF. 3. Superresolution DF. 4. Antenna array design 5. HF array elements 6. Digital receivers 7. SRDF software 8. Adaptive beamforming for signal separation 9. SRDF and ADBF demonstration systems remarks a DF system 2 Roke Manor Research Ltd a Siemens Company Overview of HF DF. High frequency band nominally 2-30 MHz, 10-150 m wavelengths HF band still used for broadcast, marine, aviation, military, diplomatic, and amateur purposes HF Radio Direction Finding is needed to monitor and control the spectrum: Identifying interfering sources (civilian). Locating enemy forces (military). Signals intelligence Also need to be able to separate out cochannel signals Need to be able to handle the unique HF environment Groundwave and skywave propagation Potential for correlated multipath Time-varying ionospheric conditions, fading, polarization changes External noise is not spatially white 3 Roke Manor Research Ltd a Siemens Company Traditional approaches to DF directional antenna Simples
HF Radio Direction Finding Dr. David Sadler 25 th February 2010 ©Roke Manor Research Ltd a Siemens Company 1
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