Global Navigation Satellite Systems Engineering, Policy, and Design
In a GNSS spoofing attack, a terrestrial radio transmitter mimics GNSS signals at a greater signal strength than the actual system can transmit. In order to detect and mitigate a spoofing attack, it is important to know where a spoofing signal comes from and what it tries to accomplish for its ultimate neutralization.
Testing of the first Galileo Second Generation (G2) hardware has begun, with versions of the satellites’ navigation payloads and antennas undergoing evaluation to check whether they meet the ambitious performance levels set for the coming generation of Europe’s GNSS.
By Inside GNSS
Interference mitigation techniques should protect GNSS receivers from interference and jamming without biasing their final position, velocity and timing solution. This column analyses five popular interference mitigation techniques, including the Adaptive Notch Filter (ANF) and Pulse Blanking (PB), evaluating their impact on pseudoranges and on the final position and timing solution. Several GNSS modulations are considered, showing the advantage of using GNSS signals with similar spectral characteristics.
There has been much discussion of the need for resilient PNT over the past few years as dependencies have grown and an evolving threat matrix has become more active. As a nation, we need a measured and cost-effective response commensurate with the level of threats and the possible consequences.
Swift Navigation of San Francisco and Tokyo-based KDDI Corporation, a telecommunications company have partnered to bring precise positioning to the Japanese market.
By Inside GNSS
The European Commission and the European Space Agency (ESA) selected Leonardo’s hydrogen atomic clocks for Galileo Second Generation.
By Inside GNSS
Fugro’s SpaceStar GNSS Precise Point Positioning (PPP) service provides high-accuracy positioning in space. Highly accurate positioning in LEO is becoming increasingly important for Earth observation applications, safe constellations management, and space debris collision avoidance.
By Inside GNSS
Tallysman Wireless announced its new eXtended Filtering (XF) features to the TW3900 series of Accutenna precision antennas. The XF feature is designed to mitigate interference from all near-band signals.
By Inside GNSS
The future-oriented Navigation Technology Satellite-3 (NTS-3) spacecraft has taken one more step towards its in-space demonstration, scheduled for 2023. The satellite bus that will carry it has arrived at L3Harris Technologies of Palm Bay, Florida, delivered by Northrop Grumman Corporation.
By Inside GNSS
In the beginning, GPS was envisioned as a military program. A sign on the wall in the Joint Program Office where the system came into being during the early 1970s read: “The mission of this Program Office is to:
A Department of Homeland (DHS)-chartered May 2021 report concludes that PNT threat and resilience concerns are not as dire as some have made them out to be, and that funds for backup could be spent elsewhere. Why this runs counter to other recent government reports is not clear, nor is the fallout from this divergence of Congressionally mandated views. The Department of Transportation has distanced itself a bit from this report by the RAND Corporation—and even its issuer, the DHS, seems to have done so.
A European consortium led by the French map service provider GEOSAT will investigate how the combination of self-driving mapping cars — or autonomous mobile mapping systems (AMMS) — and artificial intelligence-based mapping software can automate the production of high-definition (HD) maps.
By Inside GNSS
Trimble added to its mobile mapping portfolio with its new MX50 mobile mapping system for asset management and mapping.
By Inside GNSS
