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The vulnerability of GPS systems to various signal incidents is well documented. The rapid proliferation of GPS systems has embedded these vulnerabilities into critical national infrastructure as well as corporate infrastructures that rely on GPS-delivered position, navigation and timing (PNT) for daily operations. The widespread deployment of GPS makes it impractical to replace all fielded GPS systems in a timely or cost-effective manner.
Microsemi provides a portfolio of technologies, products, and services that enables operators of Critical Infrastructure to construct a secure and robust PNT network that is resilient to GPS errors as well as errors coming from other sky-based delivery channels such as Galileo, GLONASS, BeiDou, or another. Details of this complete portfolio can be found here.
The new BlueSkyTM GNSS Firewall protects already deployed GPS systems by providing a cost-effective overlay solution installed between existing GNSS antennas and GPS systems. Similar to a network firewall, the BlueSky GNSS Firewall protects systems inside the firewall from untrusted sky-based signals outside the firewall.
Contained within the BlueSky GNSS Firewall is a software engine that analyzes the GPS signal. GPS signal data is received and evaluated from each satellite to ensure compliance along with analyzing received signal characteristics.
Microsemi’s BlueSky GNSS Firewall is deployed in-line between an existing GPS antenna and GPS receiver system and can be placed near the GPS receiver system or near the point at which the GPS antenna cable enters the building. Thus, nearly all currently deployed GPS antennas are supported without modifying the existing installation.
Upgrading the BlueSky GNSS Firewall with the MAC enhances anomalous GPS detection capabilities while also extending holdover performance of the hardened GPS signal output for multiple days.
10 MHz or 1 PPS inputs allows for connection of autonomous references sources such as Microsemi's 5071A or TimeCesium products to extend the holdover performance in case of a complete loss of GPS reception for long periods of time.
At the core of the BlueSky GNSS Firewall is a programmable anomaly detector that validates the GPS subframes for spoofing incidents based on defined data validation rules. A wide range of rules have already been built into the BlueSky GPS Firewall to detect suspicious time and position inconsistencies. As with traditional security firewalls, new validation rules are dynamically loaded into the BlueSky GPS Firewall as new threats are identified.
Management of wide scale deployment of 10's, 100's or 1000's of BlueSky GNSS Firewall units is simplified using Microsemi's TimePictra management system. TimePictra enables a regional, national, or a global view of your PNT infrastructure to provide early alerting of threats before your PNT network is violated.
Integrated within TimePictra, BlueSky Performance Monitoring enables visibility of GPS reception parameters across a wide-scale deployment of BlueSky GNSS Firewalls. GPS signal measurements such as GPS phase deviation, GPS satellites in view, and GPS signal strength can be plotted for selected time periods. This aids critical infrastructure operations to more quickly identify and isolate GPS incidents.
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