PHASE I: Phase I will consist of a feasibility study of applying chaotic modulation techniques to transponded SATCOM signals operating at X, Ku, and Ka frequency bands. The study effort will concentrate on showing how chaotic modulation will improve bandwidth efficiency, increase anti-jam capabilities, and improve the Low Probability of Interception and Detection (LPI/LPD) of transponded SATCOM signals. It is expected that waveform modeling and simulation with a tool such as MATLAB or Octave will be part of the Phase I effort.
PHASE II: Phase II will consist of applying the results from Phase I to design and build a prototype SATCOM modulator and demodulator for implementing chaotic modulation and demodulation schemes. The transmit and receive intermediate frequency (IF) interfaces of the SATCOM modulator and demodulator should be compatible with standard commercial L-band (950-1950 MHz) IF interfaces. Completion of Phase II will yield demonstration and delivery of the developed prototype.
PHASE III: Phase III may consist of incorporating chaotic modulation schemes into a complete Engineering Development Model (EDM). Future goals include incorporating chaotic modulation schemes into a complete On The Move (OTM) or manpack terminal architecture. All commercial communication platforms, i.e. wireless, fiber optic, and ethernet will benefit from the higher bandwidth and lower power requirements gained from developing chaotic modulation / demodulation techniques.
REFERENCES:
1. Chaotic Communications, their applications and advantages over traditional methods of communication Riaz, A.; Ali, M.; Communication Systems, Networks and Digital Signal Processing, 2008. CNSDSP 2008. 6th International Symposium on 25-25 July 2008 Page(s):21 - 24.
2. Hyper chaos synchronization shift keying (HCSSK) modulation and demodulation in wireless communications Di He; Chuan-jiang Yan; Fang-ming Zhao; Neural Networks and Signal Processing, 2008 International Conference on 7-11 June 2008 Page(s):250 - 254
3. Applications of chaotic time series analysis to signal processing Downes, P.T.; Signals, Systems and Computers, 1992. 1992 Conference Record of The Twenty-Sixth Asilomar Conference on 26-28 Oct. 1992 Page(s):98 - 104 vol.
KEYWORDS: Keywords: chaos, chaotic, waveform, wideband, modulation, demodulation, modulator, demodulator, modem, satcom, satellite, terminal, communication, satellite communication, noise, signal, detection, jamming, jammer, jam
A09-064 TITLE: Micro Cryocooler for Low Temperature Superconductor Electronics Systems
TECHNOLOGY AREAS: Materials/Processes, Electronics
OBJECTIVE: To design a small form factor, high efficiency, low power consumption cryogenic cooler capable of reaching and sustaining 3.5 degrees Kelvin. To canvas current micro cryogenic cooler technology such as staged MicroElectroMechanical Systems (MEMS) and other staged cooler technology for applications in developing a micro cryocooler for low temperature superconductor electronics systems.
Niobium superconductor microelectronics have been used successfully in developing a satellite receiver that is capable of directly digitizing at least 125 Megahertz (MHz) at X-Band Radio Frequency. This capability will allow the use of multi-modem processors capable of processing hundreds of communication channels simultaneously. The net effect of such capability on the implementation of the Global Information Grid (GIG) will be greatly increased communications through a significantly smaller terminal with a smaller antenna than is currently needed for the same data rate. The development of a micro cryocooler will enable the use of Niobium superconductor circuits in low Size Weight and Power (SWaP) environments, such as On The Move (OTM) terminals thereby supporting AMC Mission & Vision 2015 Strategic Goal 1 and greatly enhancing the Warfighter's OTM WIN-T capability.
DESCRIPTION: Currently room temperature semiconductor electronics, i.e. Gallium Arsenide (GaAs) and recently Gallium Nitride (GaN) are used in complex communication systems such as a Satellite Communications (SATCOM) modem. The Communications-Electronics Research, Development and Engineering Center (CERDEC) has funded the development of a new branch of communication systems designed to use superconductor electronics based on Niobium. Niobium (Nb) is a transition metal and presents superconductor characteristics below its critical temperature of 9.3 degrees Kelvin. In order to ensure stability of circuit operation a Niobium based superconductor circuit operates in the range between 3.5 and 4.0 degrees Kelvin. The choice of Niobium is necessary in order to build the complex circuitry necessary for the direct digitization of X and Ka band RF signals. The CERDEC funded superconductor development has been co-funded by the Navy through the funding of several key technology objectives. Both the Navy and CERDEC superconductor systems, All Digital Receivers (ADR), are functional and have demonstrated very wideband (125 Megahertz) signal reception and direct digitization not currently possible with room temperature semiconductor electronics.
Since the circuitry of the ADR is a superconductor operating at 3.5 to 4.0 Kelvin, a cooling mechanism is required. Currently this cooling system is rather bulky and consumes approximately 1600 watts for a net cooling output of 200 milliwatts. The 200 milliwatt cooling requirement is based on the present ADR design. Future ADR designs will require an order of magnitude less in cooling power. The objective of this SBIR is to develop a cooler capable of reaching in a matter of hours and sustaining a temperature of 3.5 Kelvin over an indefinite period of time or as long as is technically feasible. The cooler must consume less than 250 watts of power and provide at least 30 milliwatts of cooling power for a nine (9) cubic inch volume. The nine (9) cubic inch volume will be encased in a vacuum chamber in order to provide thermal isolation with the ambient environment. The cooler itself should occupy less then 64 cubic inches.
PHASE I: During Phase I, a comparison will be conducted of four (4) degree Kelvin cryocoolers including possible systems incorporating MicroElectroMechanical Systems (MEMS). After looking at the trade off options between each system, a suitable cryocooler will be designed. Completion of Phase I will yield a complete micro cryocooler design. Phase I exit criteria will include simulation results and analysis or other suitable data proving the cooler design will meet the requirements listed above. Phase I option 1: delivery of Engineering Development Model of designed cryocooler.
PHASE II: During Phase II, the cryrocooler design developed in Phase I will be implemented in hardware. After a review of system specifications and design, the final cryocooler design will be manufactured. Completion of Phase II will yield demonstration, delivery, and training of a completed micro cryocooler. The contractor will perform a demonstration of the final deliverable that shows the actual cooling time as well as sustained temperature (4.0 Kelvin) for at least several hours. Phase II exit criteria will include test data and analysis or other suitable data showing that the cooler meets the requirements listed above. Phase II option 1: delivery of more than one copy for a nominal cost.
PHASE III: Phase III may consist of incorporating the micro cryocooler into the Communications-Electronics Research, Development and Engineering Center (CERDEC) owned All Digital Radio (ADR) or other suitable superconductor electronics systems architecture. The development of a micro cryocooler will bring superconductor based computing within reach of the professional and business class arenas. Overcoming the size, maintainability, and expense of the cryocooler is a major hurdle for the widespread use of superconductors within commercial products.
REFERENCES:
1. 169 kelvin cryogenic microcooler employing a condenser, evaporator, flow restriction and counterflow heat exchangers, Burger, J.; Holland, H.; Berenschot, E.; Seppenwoolde, J.-H.; ter Brake, M.; Gardeniers, H.; Elwenspoek, M.; Micro Electro Mechanical Systems, 2001. MEMS 2001. The 14th IEEE International Conference on 21-25 Jan 2001 Pages: 418-421.
2. Fabrication of Hermetic Cell Using MEMS Technology, Tingkai Zhang; Zhiyin Gan; Xinyi Zhao; Honghai Zhang; Sheng Liu; Electronic Packaging Technology, 2006. ICEPT '06. 7th International Conference on
26-29 Aug. 2006 Pages: 1-3.
3. A fast open-cycle cryocooler for cryogenic high-speed signal processing circuits Hohenwarter, G.; Grange, J.; Whiteley, S.; Magnetics, IEEE Transactions on Volume 23, Issue 2, Mar 1987 Pages: 775-776.
KEYWORDS: cryocooler, superconductor, electronics, microelectronics, microelectromechanical systems, MEMS, all digital, low temperature, cryogenic, compressor, compression, helium, coolant, fluid dynamics, heat flow, tactical, size weight and power, SWAP, SATCOM
A09-065 TITLE: Free Space Optical Connections for Airborne On-the-Move Nodes at High Data Rates
Over Extended Distances
TECHNOLOGY AREAS: Information Systems, Electronics
OBJECTIVE: Develop a Free Space Optical (FSO) communication system suitable for the airborne layer operational environment. System requirements include reliable high-bandwidth long distance (minimum of 50 kilometers terrestrial footprint) optical connectivity with continuous On-The-Move (OTM) communications in a wide variety of weather conditions in a relevant military environment.
DESCRIPTION: The tactical communications environment currently hosts a wide variety of space, air, and terrestrial based systems. Most of the communications links are accomplished via Radio Frequency (RF) channels. While RF is suitable for many applications, there is an increasing need for very short bursts of extremely high bandwidth for bidirectional transmission of high resolution imagery or high quality video streams. The typical RF system employed in an OTM operational environment has neither the system power nor the antenna gain necessary to allow the very high bandwidth communication channels increasingly required for tactical imagery and video Situational Awareness (SA).
The state of the art in commercially available FSO solutions consists of stationary nodes placed in highly visible locations mainly for the purpose of building to building or fixed site to fixed site communications. This SBIR will focus on developing OTM FSO solutions suitable for use enabling high bandwidth communications between airborne and terrestrial platforms. This SBIR intends to directly address the air – ground tactical communications segment. All proposed solutions must include at least a single air-ground link.
PHASE I: During Phase I the requirements, challenges, and risks of deploying a tactical optical communication system will be examined closely. The feasibility of tactical free space optical communications will be examined and a small scale experiment or simulation of the proposed solution will be required as a deliverable of this phase. The project will concentrate on the issues related to use of this equipment in a military environment, where such issues as mobility with attendant stresses including vibration, shock and other effects of variable and rough terrain environments will pose specially difficult conditions for maintaining FSO links.
Some of the requirements, challenges, and risks that will be addressed in Phase I are:
1. Describe and define the feasibility of an FSO system for communication range extension in a rigorous military environment, with particular emphasis on an OTM ground component with an airborne connection. Define the capability with respect to required pointing accuracy, beam width and the likelihood/risk of system development to meet the requirements. What are the performance capabilities/issues in air to air, air to ground, or ground to ground network connections in on-the move configurations? What are some of the maximum achievable performance parameters, including speed of platform, maximum data rate, link distance? What are the likely scalability issues, as minimizing size, weight and power (SWaP) is important as user needs will require that payloads will be installed in varying airborne platforms some capable of carrying only a few pounds with low power availability. Scalability of the solutions is important for satisfying versatile applications. Appropriate modeling and simulation will be used to explore and verify the viability of the expected approach.
2. Present an evaluation of weather effects, appropriate operational wavelengths and other factors that affect system performance and expected operational constraints expected with a military optempo. What are the performance losses as a function of weather conditions? What are the availability metrics? Which wavelengths from below are appropriate to mitigate weather considerations? Sample bands are indicated below. Note that any feasible FSO band(s) will be considered.
O band Original 1260–1360 nm
E band Extended 1360–1460 nm
S band Short wavelength 1460–1530 nm
C band Conventional 1530–1565 nm
L band Long wavelength 1565–1625 nm
U band Ultralong wavelength 1625–1675 nm
3. Regulatory considerations. What impediments are imposed by licensing/frequency regulation in appropriate ranges? What are the geographic considerations, such as operating in CONUS vs. OCONUS?
PHASE II: The results of the feasibility phase wii be analyzed and optimized to create a realistic experiment that proves the viability of the selected approach. The proposed solution developed in Phase I will be fully exercised in a working prototype system. The demonstration will be performed in relevant military environment, to concentrate on connections between a ground mobile and airborne platform, and consider the environmental conditions unique to this application. The experiment will stress the system to its logical limits, addressing the metrics developed in the feasibility phase and taken into this demonstration phase. The demonstration and test report delivered with the prototype will detail the requirements developed in Phase I, and compare the modeling and simulation results with the experimental results obtained from the demonstration event. The report will include such performance characteristics as maximum link distance, data rate, quantification of the impacts of environmental and military vehicular usage effects. The successful completion of Phase II will yield a free space optical communication system suitable for the airborne layer operational environment. This demonstration must provide an evaluation of the working solution to an applicable military real-world environment and that identifies a practical solution that could enter a further system design and development phase.
Expected TRL: 5
PHASE III: During Phase III, the system developed in Phase II will be integrated into the wider tactical communications environment. Operation of the equipment will be assessed in a relevant, complex and stressed communication environment with multiple data links with competing RF networks. This will provide for data exchange primarily in an air to ground environment. This will support airborne network initiatives that are paramount to Army operations and represent ongoing user requirements as indicated in TRADOC documents, including AERIAL LAYER NETWORK TRANSPORT ICD, dated 29 May 2008. This capability is of interest to such PM''s as WIN-T or ACS. Commercial capability has been demonstrated, but in a fixed and lower data rate environment.
REFERENCES:
1. http://www.hqisec.army.mil/isec/publications/Analysis_of_Free_Space_Optics_as_a_Transmission_Technology_Mar05.pdf
2. http://www.osa.org/news/policyprograms/specialevents/don%20boroson%20-%20lasercom.pdf
3. Challenges in establishing free space optical communications between flying vehicles, Muhammad, S.S.; Plank, T.; Leitgeb, E.; Friedl, A.; Zettl, K.; Javornik, T.; Schmitt, N.; Communication Systems, Networks and Digital Signal Processing, 2008. CNSDSP 2008. 6th International Symposium on 25-25 July 2008 Page(s):82 - 86.
KEYWORDS: Lasercom, long distance, on-the-move, regulatory, airborne
A09-066 TITLE: Distributed Satellite Communications (SATCOM) On-the-Move (OTM) Aperture
TECHNOLOGY AREAS: Information Systems, Sensors, Space Platforms
ACQUISITION PROGRAM: PEO Intelligence, Electronic Warfare and Sensors
OBJECTIVE: To develop a distributed, scalable aperture that supports Satellite Communications On-The-Move.
An innovative approach to support SATCOM OTM communications with a distributed aperture is required that could be integrated into available spaces on a tactical vehicle. The separate pieces would fit within available space and work together to provide required connectivity.
DESCRIPTION: There are current efforts underway to develop terminals supporting satellite communications on-the-move for different frequency bands and DoD systems (e.g. WIN-T and FCS). Size, weight, and power are design drivers. These efforts are struggling with integration issues for different tactical vehicles. A flexible approach that could be distributed and also scale to space available would ease integration issues and allow for optimal connectivity for vehicle space available.
An innovative solution is required to support SATCOM OTM communications with a distributed aperture that could be integrated into available spaces on a tactical vehicle. The separate pieces would fit within available space and work together to provide required connectivity.
- Supports adding SATCOM OTM to over-subscribed vehicles with limited top side space
- Flexible and scalable to support different vehicles
- Potential benefit for "soft" blockages and increased blockage mitigation
- Increased robustness and less likelihood for comms outage with the allowance for soft failures.
- Potential benefit to reduce profile
The intent is to develop innovative solutions to aperture distribution in order to support an objective system that can be used over the Department of Defense Wideband Global System satellite, which utilizes X and Ka bands.
Objective System Definition
- The objective system will consist of antenna apertures and radio frequency components, cabling, any required Inertial Navigation Unit and/or GPS, and any required controllers to achieve specified performance. INU and controller/processors may be internal to vehicle. Modem interface will be L band. Power to be supplied by the vehicle at 28 VDC.
Performance Parameters
- The antenna/RF system being developed is intended to operate over the Wideband Global System (WGS) satellites at X and Ka/K bands. X band frequencies are 7.9 to 8.4 GHz transmit and 7.25 to 7.75 GHz receive. Ka/K band frequencies are 29.5 to 31 GHz transmit and 19.7 to 21.2 GHz receive.
- Polarization will be circular and switchable between right hand and left hand for both X and Ka/K.
- The antenna/RF system being developed shall be flexible and modular to support distributed and scalable operation on a variety of tactical vehicles. Overall EIRPs to be achieved are 40 dBW at X band and 49 dBW at Ka band. Overall G/Ts to be achieved are 6 dB/K at X band and 12 dB/K at K band. This performance is to be achieved within an undistributed area of 30" x 30" at a height of 6" and when distributed in up to 8 locations around the vehicle, each location up to 30 ft from any central controller. Distributed locations may not be on the same physical plane and the contractor shall provide analysis on performance at height/tilt/distance limitations. Performance is desired for full azimuth operation and for elevation angles from 20 to 90 degrees relative to the vehicle.
- The system will support pointing requirements in a tactical environment, to include maximum velocity of 200 deg/sec in azimuth and elevation and maximum acceleration of 500 deg/sec/sec in azimuth and elevation. Maximum loss due to pointing shall be 1 dB.
- The system will operate in a Radio Frequency and blockage environment typical of a tactical vehicle. The system design shall be flexible to accommodate these limitations. The contractor shall provide analysis describing system operation under tactical operations, to include but not be limited to blockage, RF interference, or the physical loss of one or more distributed apertures.
- Beamwidths will be characterized for all cases and compared with Mil-Std-188-164/165 requirements.
PHASE I: - Identify issues and design drivers as well as a trade-off of approaches for the objective system
- Design an X band distributed aperture based on the optimal approach
- Design a Ka band distributed aperture based on the optimal approach
- Define the technical challenges associated with each design and identify an approach for a Phase II prototype
PHASE II: - Develop, fabricate, and integrate a distributed aperture prototype. Demonstrate the basic combined performance of distributed apertures (not the entire objective system).
PHASE III: - Build and demonstrate entire tactical distributed aperture system to include meeting antenna pointing requirements and environmentals. This objective system will consist of antenna apertures and radio frequency components, cabling, any required Inertial Navigation Unit and/or GPS, and any required controllers to achieve specified performance.
For Phase III military application of this SBIR, Future Combat System (FCS) Manned Ground Vehicles (MGV) and WIN-T Points of Presence (POP) and Tactical Communication Nodes (TCN) would directly utilize this technology in order to achieve additional satellite communications on these vehicles that would not have been possible previously. The SBIR output technology would be transitioned to the respective program of record to accomplish this. For Phase III commercial application of this SBIR, commercial satellite communications applications such as the news media would utilize this technology in order to achieve satellite communications on vehicles not previously able to accommodate it, increase effectiveness by being able to transmit and receive on-the-move, and reduce current setup times. This technology is also commercially viable for other specialized commercial applications such as African expeditions where satellite communications on-the-move would be applicable
REFERENCES:
1. The Good The Bad and The Ugly (ppt); https://forums.bcks.army.mil, White, Robert SSG NG NGB [bill.white@us.army.mil], Work Phone: 214-708-9065, HHC 1-179th INF BN, 25U, OKARNG
2. http://handle.dtic.mil/100.2/ADA456321
Title: Multi-Band Integrated Satellite Terminal (MIST) - A Key to Future SOTM Band Integrated Satellite Terminal (MIST) - 01-Jan-2006 433870 2 6 MITRE CORP DUMFRIES...mobile, interoperable, and provides SATCOM-on-the-move (SOTM) and SATCOM-on-the-pause (SOTP) capability. PM MILSATCOM...
http://www.dtic.mil/srch/doc?collection=t2&id=ADA456321
Personal Author: Comparetto, Gary Hall, Bill. Corporate Author: MITRE CORP DUMFRIES VA. Source Code: 433870. Technical Reports
3. http://handle.dtic.mil/100.2/ADA417222
Title: EHF Satellite Communications on the Move: Experimental Results
...conducted with an EHF SATCOM on the move (SOTM) terminal developed to work with LDR MILSTAR...designed to measure characteristics of the EHF SOTM propagation channel, yield insight into...crossing rates. Discrete models for the EHF SOTM channel are also explored and compared...
http://www.dtic.mil/srch/doc?collection=t2&id=ADA417222
Personal Author: Schodorf, J B. Corporate Author: MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB. Source Code: 207650. Technical Reports.
4. http://handle.dtic.mil/100.2/ADA479847
Title: Virtual Combat Vehicle Experimentation for Duty Cycle Measurement
...unlimited. 30-Apr-2008 Virtual Combat Vehicle Experimentation for Duty Cycle Measurement...DUTY CYCLE MEASUREMENTS, CAT(CREW INTEGRATION AND AUTOMATION TESTBED), POWER CONSUMPTION...a high fidelity representation of the vehicle
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