How the army wants to protect missiles from GPS jammers

With GPS jammer becoming more widespread, the army wants its missiles to be able to ignore fake signals.

The Army is looking for “novel techniques that use existing antenna configurations or minor changes to the vehicle’s RF front end to determine the direction of arrival of malicious sources of interference (i.e. trackable parody signals) on a missile platform (potentially expandable to other platforms),” according to the above the call from Small Business Innovation Research.

WIFI GPS DCS PCS signal jammer

The solution must be “generally feasible or available hardware and resources on missile platforms to achieve an on-board damage control routine for interference signals,” the Army said. “Available hardware may include built-in CSAC (chip-scale atomic clocks), an FRPA antenna, and possibly a multi-element CRPA antenna module (with covariance estimate available). Software approaches are recommended, but minor hardware upgrades may be considered.”

The army points to newly developed algorithms that would allow a missile to detect jammers and determine their location, such as. B. Multiple Signal Classification (MUSIC). These algorithms focus on the unique properties of jammers. “For example, trackable interference, also called spoofers, is likely to create the entire GPS-like constellation and broadcast from a common point. Thus, these signals create an exogenous constellation-wide delay (i.e., in a flex-tube versus line-of-sight RF) transmission. Other defining Malicious disturbance characteristics can include increased energy (i.e. jammers), clock drift / offset coloring, inter-satellite interference, etc. “

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