Submarine UHF SATCOM (25 kHz CPM) Narrowband Interference and Multipath Mitigation with Nonlinear Adaptive Filtering

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00039-07-C-0135
Agency Tracking Number: N071-103-0660
Amount: $99,941.00
Phase: Phase I
Program: SBIR
Awards Year: 2007
Solicitation Year: 2007
Solicitation Topic Code: N07-103
Solicitation Number: 2007.1
Small Business Information
11829 La Colina Rd., San Diego, CA, 92131
DUNS: 141703756
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Brandon Zeidler
 Chief Technology Officer
 (858) 705-2781
Business Contact
 James Zeidler
Title: President
Phone: (858) 566-5627
Research Institution
We propose to develop innovative nonlinear adaptive filtering techniques to simultaneously mitigate the effects of narrowband interference and multipath distortion for the 25 KHz Continuous Phase Modulation (CPM) MIL-STD-188-181B waveform for submarine communications and other DoD applications. Our approach is based on an extension of nonlinear adaptive filtering techniques that we developed and successfully applied to the 5KHz Shaped Offset Quadrature Phase Shift Keyed (SOQPSK) MIL-STD-188-181B waveform in previous work. These algorithms will be redesigned to provide effective performance with the 25 KHz CPM waveform in the presence of both CW interference and multipath distortion. In Phase I, we will provide a complete software receiver capable of signal acquisition and subsequent tracking of frequency, phase, timing, and the Reed-Solomon coding and Viterbi detection functions specified in MIL-STD-188-181B. The filters developed will be robust to the high levels of interference frequently encountered in tactical networks, and will solve the tactical requirement of interference mitigation with minimal signal distortion by the development of a multi-stage nonlinear adaptive filtering approach that is able to recognize the start of the preamble and acquire and track the 25 KHz coded CPM waveform in the presence of severe CW narrowband interference.

* Information listed above is at the time of submission. *

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