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Overview
Mayflower has been developing state-of-the-art GPS Anti-Jam systems for nearly 20 years. Mayflower’s Anti-Jam technology has been developed and refined over this period under numerous DoD-sponsored programs, starting in the late 1980’s with an Air Force sponsored Technology Demonstration program to design an adaptive temporal filter (ATF) for suppressing narrowband jammers. Mayflower continued the technology improvements in the 1990’s with multiple SBIR Phase II programs, sponsored by the Army and the Navy, to design adaptive spatial/temporal filters for suppressing broadband and narrowband jammers. Presently, through a Navy SBIR Phase III program, Mayflower is developing a Digital (Vanguard™) and an RF ASIC (Beacon™) to reduce the size, power and cost of the proven AJ technology.
Mayflower was the first (in 1991) to develop an adaptive temporal filter (ATF) algorithm for digital Anti-Jam (patent protected). This technology has been reduced to practice in various form factors, from a chassis to a single chip.
Mayflower integrated the ATF with a digital adaptive array to provide an adaptive spatial temporal filter (ASTF) technology (patent protected). The ASTF algorithm extends the capability of ATF to suppress both multiple broadband jammers and narrowband jammers. Mayflower has also designed a digital spatial temporal adaptive processing (STAP) control for a miniature GPS array developed by the GPS Joint Program Office, and demonstrated that nulling comparable to that with a typical half-wavelength arrays can be achieved despite the strong mutual coupling characteristics of the miniature GPS array. Mayflower’s Anti-Jam capability extends to wireless communications as well, and it includes a modular algorithm for MIMO wireless systems (patent pending).
Electronics
Mayflower has developed Anti-Jam hardware and software incorporating different Anti-Jam algorithms to address different aspects of jammer threats. The first generation of Mayflower Anti-Jam solution was in multi-card chassis. The AIC-2000 was an implementation of the adaptive temporal filter algorithm for C/A code GPS receivers. The AIC-2100 was an implementation of the adaptive temporal filter algorithm for C/A code and P(Y) code GPS receivers. The ACM-400 was an implementation of the adaptive spatial-temporal filter algorithm for C/A code and P(Y) code GPS receivers.
Figure 1—The First Generation Mayflower digital Anti-Jam units. From left to right, AIC-2000 (ATF Technology for C/A code GPS receiver), AIC-2100 (ATF Technology for P(Y) and C/A code GPS receivers), ACM-400 (ASTF Technology for P(Y) and C/A code GPS receivers)
The second generation Mayflower Anti-Jam technology, which provides 4-channel Anti-Jam on a single circuit card assembly, is an active product.
The third generation Mayflower Anti-Jam technology is a System on Chip (SOC) implementation, Vanguard™, for the C/A, P(Y), and M code GPS signals. The Vanguard SOC supports various Mayflower developed Anti-Jam algorithms providing 30 dB of protection against multiple wide band jammers and 40 dB of protection against multiple narrow band jammers. The device is packaged in an 11 mm x 11mm low profile BGA package. The device provides a direct digital interface to the Mayflower GPS receiver chips (Integrity™ and Magic™ ) or can be followed by an RF up-converter and used as an Anti-Jam module in front of any third party GPS receiver.
Mayflower Anti-Jam technology is robust and designed to operate in high-shock environments, such as in a gun launched projectile. The Anti-Jam modules are proven to perform at a high level under demanding conditions. A typical test that the Mayflower Anti-Jam modules undergo is performance qualification while spinning at a high rate, to mimic the spin of a projectile, as shown in the jamming test conducted at the White Sands Missile Range.
Figure 2—Testing of Mayflower Anti-Jam modules while spinning at a high rate at White Sands Missile Range.
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