Global Navigation Satellite Systems Engineering, Policy, and Design
Microchip Technology Inc. has released the SA65 chip-scale atomic clock (CSAC) for precise timing accuracy and stability in extreme environments. The product is designed primarily for advanced military platforms, ocean-bottom survey systems and remote sensing applications.
By Inside GNSS
In-flight refueling requires sustained minimal separation between paired aircraft with little room for error. In or near combat zones, wide-area GPS-denial or spoofing means that an GPS-independent system must be available. Regardless of the selected sensor package, a common set of properties must be satisfied to facilitate mid-air docking: a high degree of accuracy, precision, and integrity.
UrsaNav and ADVA have conducted an enhanced long-range navigation (eLoran) field trial using UrsaNav’s eLoran receiver and ADVA’s Oscilloquartz grandmaster clock technology. The successful demo showed that eLoran offers a robust and reliable backup for GPS and other GNSS and could be used to provide an assured position, navigation, and timing (PNT) service.
By Inside GNSS
The addition of alternative sensors such as cameras, magnetometers, and small ranging radios increases the likelihood of a mismodeled and/or faulty sensor, affecting the accuracy and performance of the overall navigation solution. Unlike two-sensor systems such as GPS-inertial integration, systems of three or more sensors present the problem of ambiguity as to which sensor is adversely affecting the solution. This presents the need for a robust framework that can maintain navigation integrity despite the additional sensor modalities.
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.
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 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.
Hexagon has acquired Immersal Oy, a provider of spatial mapping and visual positioning solutions used to produce augmented reality (AR) applications.
By Inside GNSS
New frontiers have opened up for line-of-sight communication, targeting, autonomous navigation, intelligence, surveillance and reconnaissance (ISR) and more, with the astonishing advances in inertial technology.
By Inside GNSS
The Air Force Strategic Development Planning & Experimentation Office demonstrated fused PNT technologies within an AgilePod during six successful Phase I sorties on an airborne testbed in Centennial, Colorado in April.
By Inside GNSS
Iridium Communications Inc. received a research and development contract worth up to $30 million from the United States Army to develop a payload to be hosted on small satellites that supports navigation systems, guidance and control for GPS and GPS-denied precision systems.
By Alan Cameron
