|Student Name:||Capt David Archer|
|Thesis:||High Frequency Magnetic Field Direction Finding Using MGL-S8A B-Dot Sensors|
|Location:||ENG Conference Room - BLDG 640 Room 317|
|Date & Time:||02/08/2013 at 1500|
|Abstract:|| Aircraft based high frequency direction finding (HFDF) is difficult due to the aircraft’s size with respect to wavelength and limited azimuthal resolution. A B-dot sensor detects the time-varying magnetic field and offers improved integration into an aircraft. What the B-dot sensor gains in integration it gives up in sensitivity because it is designed for frequencies above 5 GHz. Design of an airborne HFDF array using B-dot sensors is based in maximizing the physical extent of the array and eliminating multiple main beams. The goal of this research is to complete a computational analysis of a B-dot sensor and a cluster closely spaced sensors. Additionally, eight and ten-sensor elements are placed on a simulated airframe to characterize the airborne HF direction finding capability. The B-dot sensor is inadequate for use in an HFDF array due to a lack of sensitivity, but simulations of a larger B-dot sensor, designed for 700 MHz, provide 30 dB of increased sensitivity. The arrays offer a limited direction finding capability due to less than 10 dB sidelobe reduction from the main lobe, but the addition of two sensors does present sidelobe reduction.