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

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$69,980.00
Award Year:
2007
Program:
SBIR
Phase:
Phase I
Contract:
N00039-07-C-0135
Agency Tracking Number:
N071-103-0660
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
ADAPTIVE DYNAMICS, INC.
11829 La Colina Rd., San Diego, CA, 92131
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
141703756
Principal Investigator:
Brandon Zeidler
Chief Technology Officer
(858) 705-2781
brandonzeidler@sbcglobal.net
Business Contact:
James Zeidler
President
(858) 566-5627
jrz@san.rr.com
Research Institution:
n/a
Abstract
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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