|Acquisition Program: ||SH-60 (B, R), Fire Scout, P-8A, P-3C|
| ||RESTRICTION ON PERFORMANCE BY FOREIGN NATIONALS: This topic is “ITAR Restricted”. The information and materials provided pursuant to or resulting from this topic are restricted under the International Traffic in Arms Regulations (ITAR), 22 CFR Parts 120-130, which control the export of defense-related material and services, including the export of sensitive technical data. Foreign nationals may perform work under an award resulting from this topic only if they hold the “Permanent Resident Card”, or are designated as “Protected Individuals” as defined by 8 U.S.C. 1324b(a)(3). If a proposal for this topic contains participation by a foreign national who is not in one of the above two categories, the proposal may be rejected.|| Objective: ||Develop a compact total field magnetometer for use on UAVs (vertical take-off and fixed wing) employed for shallow water ASW and land-based target detection such as buried weapons caches and IEDs. This system must be a scalar total field device able to operate in all magnetic latitudes (magnetic dip angles) and aircraft attitudes without operator intervention, i.e. manually aligning a cell to the local dip angle. A vector magnetometer device is not acceptable except as an ancillary sensor to reduce noise.
|| Description: ||The CMDS is intended for use with small UAV and VTUAV platforms, manned ASW platforms, as well as land and airborne platforms for ground sensing. The Fire Scout and the SH-60 are candidate platforms for airborne ASW. The requirement consists of packaging a total field magnetometer sensor, ancillary sensors as required for noise reduction, and the signal processing technology for noise reduction and detection to fit within an ultra-light package that is compatible with the constraints of small UAV/VTUAVs, that is, light weight, compact, and low power.
The noise floor of the CMDS should be equivalent to the current military airborne Magnetic Anomaly Detection (MAD) systems; namely the Polatomic AN/ASQ-233 laser magnetometer and the CAE AN/ASQ-508 which are on the order of 0.3 pT/vHz or less over the frequency band of 0.01 Hz to 100 Hz. The goal for CMDS volume, weight, and power, including all sensor cells, electronics, ancillary sensors, and processors, should be less than half of the AN/ASQ-233. The ASQ-233 form factor is approximately 2300 cubic inches (7” diameter cylinder 60” long), weighs 21 lbs and uses 28 Watts. The CMDS concept should be compatible with ASW platforms including small UAVs and VTUAVs, Fire Scout VTUAV, current rotary-wing and fixed-wing ASW aircraft.
Currently in there are two manufacturers of military airborne MAD systems and two known commercial manufactures plus some ongoing university research which all use different earth’s field alignment techniques, optical pumping techniques, gasses, and signal processing and vary enormously in size, power, weight, noise level, bandwidth, and ruggedness. The requirement is to have a MAD system that operates at all magnetic latitudes either through the use of multiple cells or a single cell with automatic alignment. The complete system, except for any operator displays, must fit within the current P-3C detecting head canister of 7” diameter and 60” long with the goal to reduce that volume by half.
|| ||PHASE I: Develop the detailed specifications for the proposed CMDS technology that will achieve the weight, size, power, and performance requirements. Evaluate its applicability to small UAV/VTUAVs and manned ASW platforms. Develop a detailed design and to meet the requirements and establish the feasibility of designing and fabricating the CMDS breadboard in Phase II.
|| ||PHASE II: Fabricate a CMDS laboratory breadboard based on the Phase 1 design. Demonstrate the integration of all of the ancillary sensors into the system. Demonstrate the specified noise floor in a laboratory environment.
|| ||PHASE III: Design, fabricate and demonstrate a CMDS flyable breadboard in the laboratory. Install the CMDS into one of the candidate platforms or a surrogate and flight test.
PRIVATE SECTOR COMMERCIAL USE: Miniature high-performance magnetometers will find application in UAVs for geologic applications including mineral and petroleum exploration.
|| References: ||1. F. D. Colegrove and P. A. Franken, "Optical Pumping of Helium," Physical Review 119, 680 (1960).
2. W. Happer, Reviews of Modern Physics 44, 169 (1972).
3. N. Bloembergen, E. M. Purcell and R. V. Pound, Physical Review 73, 679 (1948).
4. E. B. Alexandrov and V. A. Bonch-Bruevich, "Optically Pumping Atomic Magnetometers", Op
tical Engineering 31, 711 (1992).|
|Keywords: ||Magnetometers; Magnetic Anomaly Detection; Airborne ASW; Unmanned Air Vehicles (UAVs); Vertical Takeoff UAVs (VTUAV); Improvised Explosive Devices (IEDs)|