![]() User equipment that integrates STL capabilities is designed to detect manipulation by constantly comparing PNT data from GPS/GNSS and STL to determine when the values deviate beyond an acceptable tolerance threshold. A further protection is in how STL exploits the complex and overlapping beam patterns of the Iridium satellite signals and incorporates authentication techniques in ways that make it very difficult to manipulate. This means that when the much weaker signal from GPS/GNSS is affected by interference (or simply degraded due to environmental conditions), an STL-equipped receiver detects the loss of GPS/GNSS service and continues to deliver rock-solid PNT data by seamlessly transitioning to STL.Īs with disruption, the exceptional strength of the STL signal compared to GPS/GNSS makes it significantly less susceptible to attack and therefore more reliable when facing threats from manipulation. The STL signal is about 1,000 times (30 dB) stronger than GPS/GNSS and extremely difficult to disrupt. Resilience is achieved through the strength and security of the STL signal and the design of user equipment. PNT solutions based on STL detect and mitigate GPS/GNSS signal disruption and manipulation. Detection and Mitigation of GPS/GNSS Disruption and Manipulation In this respect, GNSS and STL are complementary technologies, and receivers supporting both are ideal to deliver assured PNT. The key advantage of STL, however, is its ability to provide time and position fixes under conditions in which GNSS is not available. In settings where both GNSS and STL time and location fixes are possible, STL complements GNSS with additional PNT information. The Satelles service utilizes signal authentication techniques to enable a proof-of-location approach that allows STL to deliver a secure, trusted time and location capability that is effectively impervious to manipulation. Security is also a key attribute of STL’s PNT capability. The strength and fidelity of the signal are sufficient to allow it to pass through structures and other occlusions, providing coverage in deep indoor and urban canyon environments. The STL system allows a receiver to decode the signal and perform precise Doppler and range measurements at attenuation levels that penetrate into GNSS-challenged environments. augmenting GNSS measurements when not enough GNSS satellites are in view.providing position and precision timing that is resilient to regional outages of Global Navigation Satellite Systems (GNSS).PNT measurements from STL are intended to be used for a variety of applications:
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