Resilience against interference is a critical need for Military GPS User Equipment (MGUE) systems which must operate reliably under a wide range of conditions. Standard approaches to mitigating such interference at the radiofrequency (RF) receiver typically involve heavy and expensive signal processing to discriminate interfering emissions using multiple receive antennas. However, on low size, weight, power and cost (SWAP-C) platforms, multiple antennas are often unavailable, negating such spatial nulling approaches to interference suppression. On these platforms, single-antenna interference cancellation (SAIC) techniques offer a solution by discriminating different emissions based on either their parametric descriptions or by their non-linear behaviors. Unfortunately, most SAIC approaches are computationally intensive and incur large processing delays, making them inadequate for adoption into low SWAP-C GPS receivers. To address this, Pareto Frontier proposes a System for Interference Tolerance Using Adaptively Tuned Excision (SITUATE), a framework of fast, simple and effective algorithms intended to challenge GPS system design philosophies dictated by the assumption that antenna-side signal processing techniques are complex and power-hungry. Transitioning the SITUATE algorithms to realized hardware requires a detailed understanding of limitations and design requirements necessary for implementation onto the intended MGUE platform. Even early stages of algorithm design will be heavily influenced by these factors. Pareto Frontier's industry partner is an established leader in the development of Anti-Jam (AJ) M-code GPS receivers currently under contract to deliver common GPS modules under MGUE increment 1. Pareto Frontier will work closely with them to model and refine conventional, state-of-the-art and beyond state-of-the-art interference mitigation algorithms to identify the best set of techniques for adoption into their existing AJ GPS receivers. Pareto Frontier has been at the forefront of AJ communications signal processing, having helped develop the first ever system for the separation of wideband power-matched co-channel satellite signals. We anticipate that close collaboration across two different sets of expertise will seed new innovations in both AJ receivers for both communications and GPS.
