Electronic Warfare (EW) System Direction Finding (DF) Interference Suppression Navy SBIR FY2004.2 Sol No.: Navy SBIR FY2004.2 Topic No.: N04-164 Topic Title: Electronic Warfare (EW) System Direction Finding (DF) Interference Suppression Proposal No.: N042-164-0 Firm: Wide Band Systems, Inc., Defense Systems Division 107 Penns Trail Newtown, Pennsylvania 18940 Contact: Frederick Ilsemann Phone: (215) 504-6131 Web Site: www.widebandsystems.com Abstract: As the number and complexity of digitally modulated CW emitters increases on US Navy surface combatants, resolving the problem of suppressing interference to onboard receiver based systems, particularly EW Systems, becomes increasingly important. The proposed solution to this problem, while providing effective relief from the interfering signals, must also be able to be adapted to existing EW systems without degrading the performance of these systems. A novel approach to interference suppression has been developed and patented by Wide Band Systems, Inc. In this approach, the spectra of the omni directional antenna is processed and mixed with the spectra of the DF antenna spectra to provide interference cancellation in both the frequency and angle of arrival processing paths using a single set of filters. The proposed research will determine the feasibility of adapting the approach to the SLQ-32(V) system architecture and perform an analysis to predict the performance and to estimate the impact (if any) to system functionality. Benefits: The proposed research will adapt a unique approach for interference suppression to the SLQ-32(V) family of EW Systems. The result will be a preliminary design that can be installed in SLQ-32(V) systems degraded by digitally modulated CW emitter interference, particularly the Phase Shift Keying (PSK) modulation type utilized by commercial satellite communication systems, enabling these systems to operate reliably without major modification to either the SLQ-32(V) or the interfering CW emitters. The design is anticipated to be reliable, low cost, and low risk and will be introduced into the fleet in a way that compliments existing programs such as the Surface EW Improvement Program. While the research is focused on the US Navy's SLQ-32(V) program, the techniques described may have applicability to commercial areas such as interference cancellation for the telecommunications industry. Return