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New wavefroms for anti-jam satellite communications


OBJECTIVE: Develop a chaotic spread spectrum waveform suitable for use in future military satellite communications applications providing featureless transmission characteristics as well as the capability to overcome jamming or interference. DESCRIPTION: Transmission Security (TRANSEC) involves insuring that there is no loss in satellite communications signals through either unintentional interference in a crowded space environment or intentional jamming. In addition, with enhanced signal detection and monitoring capabilities of potential adversaries, there is a need to effectively mask communications signals between satellites and ground assets. Recent research suggests that a flexible chaotic communications waveform family could provide high information density, with improved waveform protections for anti-jam and low probability of intercept/detection/exploitation. The purpose of this topic is to develop and demonstrate a bandwidth efficient, cost effective, chaotic spread spectrum waveform with excellent AJ capability suitable for use in future military satellite communications applications while minimizing adjacent channel interference by leveraging research such as chaotic constant amplitude zero autocorrelation (CAZAC), variable high peak-to-average power ratio (PAPR) chaotic spread spectrum, chaotic Quadrature Amplitude Modulation (QAM) spread spectrum, chaotic multiple access spread spectrum, self encrypted chaotic multiple access communications, and channelized chaotic communications. Advances in processor speed should also enable waveforms to hop faster over the spectrum. Research should seek reductions in the size, weight and power (SWAP) over currently implemented Chaotic Waveforms, minimization of bit error rate (BER), spectral sidelobes, faster spectral hopping and, where appropriate, be capable of being partitioned in the current generation of radiation hardened components, particularly FPGA"s (Field Programmable Gate Arrays). PHASE I: Develop a chaotic spread spectrum waveform to meet the above requirements and design the hardware and/or software solution to demonstrate the waveform meeting requirements outlined above. PHASE II: Develop and the hardware and/or software prototype and demonstrate the waveform simulate operationperformance. Characterize for BER, LPI/LPD/LPE, link capacity, frequency hop rate and SWAP. PHASE III: Military applications for this technology include warfighter satellite communications and AISR. Commercial applications for this technology include internet routing. REFERENCES: 1. ANTI-JAM COMMUNICATIONS HAVING SELECTIVELY VARIABLE PEAK-TO-AVERAGE POWER ... Alan J. Michaels et al, US Patent Office Patent, 2. Cryptographic CDMA code hopping (CH-CDMA) for signal security and anti-jamming,Frank Hermanns, Deutsches Zentrum fur Luft- und Raumfahrt (DLR), German Aerospace Center,Institute for Communications and Navigation, D-82234 Weling, Germany,and University of Armed Forces, Neubiberg b. Munchen, Institute of Information Technology, Email: 3. Efficient and flexible chaotic communication wavefrom family,A.J.Michaels, IEEE Explore Digital Library, Military Communications Conference, 2010. 4.Efficient and Flexible Chaotic Communication Waveform Family, Alan J. Michaels, Ph.D., David B. Chester, Ph.D.,Harris Corp., GCSD.
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