All 3 signal jammer locations9/17/2023 ![]() ![]() ![]() Conventional AOA estimation using phased arrays assumes narrowband signals that satisfy the time bandwidth product: Typical passive GNSS interference sensing uses a network of phased arrays to infer two or more Angles of Arrival (AOA). ![]() ![]() Hence, it is imperative to have the ability to identify the presence of a wideband GNSS jammer and geolocate it as they pose a greater danger to GNSS users.ĪOA of a Radiofrequency (RF) emitting signal source. In comparison, narrowband jammers such as Continuous Wave (CW) are relatively frequency selective and can cause intermittent GNSS operation. Examples of intentional wideband jammers uses modulation schemes such as FM chirp (sometimes also known as swept Continuous Wave) and Additive White Gaussian Noise (AWGN). Wideband jammers or interference, intentional or not, are most effective at jamming nearby GNSS users as it is frequency agnostic and causes sustained loss of GNSS signal by nearby GNSS users (see Borio et alia, Additional Resources, posted in the online version of this article). This article proposes and validates an enhanced method for geolocating GNSS interference sources so that jammers and spoofers can be found and disabled. * Information listed above is at the time of submission.Due to the proliferation of personal privacy devices and other jamming sources, it is imperative for safety-critical GNSS users such as airports and marine ports to be situationally aware of local GNSS interference. BENEFIT: Effective jammer detection and location 1) enables alternative means to mitigate jamming (such as kinetic attack), 2) supports mission planning, and 3) increases situational awareness.The proposed collaborative jammer location (JLOC) solution provides a ground-based mobile capability to effectively detect and locate GNSS jammers at the tactical edge greatly increasing an operational teams ability to deter jamming attacks.The GNSS JLOC network technology is designed to transition into operation as a software application running on fielded tactical radios providing GNSS jammer situational awareness throughout mission execution. A plan will be developed to build and test a brassboard prototype GNSS jammer locator under Phase II for testing in laboratory and controlled field environments. ABSTRACT: Detecting and locating Global Navigation Satellite System (GNSS) jammers is a vital part of navigation warfare (Navwar), comprising the major thrust of Navwar Electronic Support (ES).The objective of this SBIR effort is to develop a ground-based GNSS Jammer Location capability capable of estimating the position of a GNSS jammer within 100 meters, and estimating jammer position within 10 meters when networked with other sensors.Under this effort we shall develop a design for a networked GNSS jammer locator suitable for detecting jammer signals operating on any of the GNSS frequencies which leverages fielded tactical radios in ground vehicles for data collection and networking.We shall investigate methods of creating observations that can distinguish between direct and multipath signal paths between the SDR units and the jammer to allow for precision geolocation of jammers and shall demonstrate through simulation the ability to provide precision jammer location using a combination of collaborative data sharing, within the bandwidth constraints of a tactical network, and onboard processing of the jammer signal. ![]()
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