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Low SWAP-C Anti-Jam Techniques for MGUE Increment 2 Handheld Receiver



OBJECTIVE: Identify and research passive and active low size, weight, power, and cost AJ techniques, technologies, and/or algorithms that can be integrated with and meet the SWAP-C constraints of the projected MGUE Increment 2 handheld receiver. 

DESCRIPTION: Anti-jam (AJ) research for GPS User Equipment has primarily been focused on producing high-performance systems that are targeted for aircraft, ship, and missile platforms operating in highly stressed Electronic Warfare (EW) environments. Controlled Radiation Pattern Antennas (CRPAs), combined with antenna electronics, have evolved to provide very high anti-jam nulling capability and high-gain beam-steering. However, the SWAP-C of these high-end systems put this capability out of reach for many users including the dismounted soldier and ground vehicles using handheld receivers like DAGR and PLGR. This large user base requires a higher level of AJ protection than is currently provided by the receivers internal GPS signal acquisition and tracking implementations to meet mission objectives in in a highly contested EW environment. Previous techniques were explored to enhance handheld AJ protection, such as a two-element nulling antenna accessory that could be externally attached to the handheld receiver. However, the SWAP of some of these techniques made them operationally cumbersome from a user perspective or provided only a marginal increase in AJ protection. Under the MGUE Increment 1 program, several techniques were developed under the Resiliency and Software Assurance Modification (RSAM) effort to enhance AJ performance of MGUE Increment 1 receivers. While these techniques are expected to transition to the MGUE Increment 2 modernized GPS handheld receiver, they will not provide the full level of AJ protection for dismounted operations in the projected EW environment. The Increment 2 handheld receiver effort is currently in the requirements definition phase. The initial SWAP constraints for this receiver are 35 cubic inches volume, 450 grams weight, and 19 hours of continuous use without battery change. This SBIR will identify and evaluate the performance and implementation of low-SWAP-C AJ techniques, including mechanical, passive, active and or algorithmic techniques, that are compatible with the MGUE Increment 2 handheld receiver SWAP constraints. The objective is to increase the AJ protection by at least 20 dB over that currently projected for the receiver itself. AJ capability should be based on scenarios consisting of multiple mobile and stationary ground-based jammers in an urban environment. Emphasis should be placed on solutions that are achievable by receiver developers (such as the MGUE Increment 1 prime contractors). The primary goal is to provide a comparative evaluation of multiple techniques, including performance, size, weight, and power and operational suitability assessments and implementation cost and prototype a sub-set of promising techniques. Offerors are encouraged to work with MGUE Increment 1 prime contractors to help ensure applicability of their efforts and begin work towards technology transition. Offerors should clearly indicate in their proposals what government furnished property or information are required for effort success. 

PHASE I: Conduct a comprehensive comparative assessment of low SWAP-C AJ techniques that are compatible with the SWAP constraints of the projected MGUE Increment 2 handheld to include AJ effectiveness, operational suitability, and size, weight, power, and cost. 

PHASE II: Since a physical implementation of the handheld receiver does not currently exist, design and implement a brassboard or prototype for one or two of the most promising low SWAP-C techniques using, as examples, a SWAP-compatible physical mock-up of the projected receiver and/or COTS development boards implementing M-code acquisition and tracking algorithms. The Phase 2 effort should include ensuring compatibility with interface requirements currently specified for the Increment 2 handheld receiver. 

PHASE III: With an MGUE Increment 2 vendor, integrate the selected SWAP-C AJ techniques demonstrated in Phase II with an Inc2 handheld prototype. Demonstrate the capability to meet performance and SWaP-C requirements. Identify transition opportunities for civilian applications such as those performed by DHS. 


1. Global Positioning Systems Directorate Technical Requirements Document, Military GPS User Equipment (MGUE), Modernized Handheld Receiver (Draft); 2. John L. Volakis, Andrew J. O’Brian, Chi-Chih Chen, “Small and Adaptive Antennas and Arrays for GNSS Applications”, Proceedings of the IEEE, Vol. 104, No. 6, June 2016; 3. Joseph Przjemski, Edmund Balboni, John Dowdle, “GPS Anti-jam Enhancement Techniques”, Proceedings of the 49th Annual Meeting of the Institute of Navigation (1993), Cambridge, MA, June 1993; 4. Steve Rounds, “Jamming Protection of GPS receivers – Part I: Receiver Enhancements”, GPS World, Vol. 15, January 2004

KEYWORDS: 1 Anti-Jam 2 MGUE Increment 2 3 GPS Modernized Handheld 

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