The document discusses the Air Force's transition to using GPS metric tracking for its launch vehicles instead of radar tracking. GPS tracking involves installing an avionics box on the rocket that sends position information to ground controllers, providing the same tracking capability as radar but at a lower cost since it eliminates the need for aging radar infrastructure. United Launch Alliance is adopting this system for its Atlas V and Delta IV rockets, with the Delta IV flight in May being the first to use GPS tracking as the primary method. This is part of the Air Force's efforts to modernize its launch ranges through less expensive and more reliable technology.
Part 1: An Overview of Aviation GNSS GPS and Augmentation SystemsStephen Sancewich
First, of a two part series, on the Global Navigation Satellite System (GNSS), that I've put together.
Part 1: An Overview of Aviation GNSS GPS and Augmentation Systems.
This will serve as a solid precursor to Part 2. What's next?
Part 2: The Practical application of GNSS in aviation.
With a fundamental understanding of GNSS in place, we'll work through: Performance Based Navigation (PBN), Required Navigation Performance (RNP), Area Navigation (RNAV), Approach with Vertical Guidance (APV) IAPs, and more.
This document is a comprehensive log of NASA news releases for the year 1978. It serves as a historical record, detailing various significant events and developments within NASA during this period. Each entry in the log includes a specific release number, a brief title summarizing the news content, and the date of release. The topics covered in these releases range from contractual agreements and developments in space technology to astronaut selections and updates on space missions. For instance, some of the notable entries include NASA's awarding of the Shuttle Radio Contract to RCA, the selection of 35 astronaut candidates, and details about the construction of the Spacelab Simulator by the Singer Company. Additionally, the log provides insights into NASA's operational decisions and collaborations with other organizations, reflecting the diverse activities and milestones of NASA in 1978. This document is a valuable resource for researchers, historians, and enthusiasts interested in the history of space exploration and the specific activities of NASA in the late 1970s.
Part 1: An Overview of Aviation GNSS GPS and Augmentation SystemsStephen Sancewich
First, of a two part series, on the Global Navigation Satellite System (GNSS), that I've put together.
Part 1: An Overview of Aviation GNSS GPS and Augmentation Systems.
This will serve as a solid precursor to Part 2. What's next?
Part 2: The Practical application of GNSS in aviation.
With a fundamental understanding of GNSS in place, we'll work through: Performance Based Navigation (PBN), Required Navigation Performance (RNP), Area Navigation (RNAV), Approach with Vertical Guidance (APV) IAPs, and more.
This document is a comprehensive log of NASA news releases for the year 1978. It serves as a historical record, detailing various significant events and developments within NASA during this period. Each entry in the log includes a specific release number, a brief title summarizing the news content, and the date of release. The topics covered in these releases range from contractual agreements and developments in space technology to astronaut selections and updates on space missions. For instance, some of the notable entries include NASA's awarding of the Shuttle Radio Contract to RCA, the selection of 35 astronaut candidates, and details about the construction of the Spacelab Simulator by the Singer Company. Additionally, the log provides insights into NASA's operational decisions and collaborations with other organizations, reflecting the diverse activities and milestones of NASA in 1978. This document is a valuable resource for researchers, historians, and enthusiasts interested in the history of space exploration and the specific activities of NASA in the late 1970s.
Here you can find out about every mission ISRO carried out in 2018. ISRO has so far carried out 110 missions on its 71 spacecrafts, out of which 9 were concluded in 2018.
GraphSummit Singapore | The Future of Agility: Supercharging Digital Transfor...Neo4j
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Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
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Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
Pushing the limits of ePRTC: 100ns holdover for 100 daysAdtran
At WSTS 2024, Alon Stern explored the topic of parametric holdover and explained how recent research findings can be implemented in real-world PNT networks to achieve 100 nanoseconds of accuracy for up to 100 days.
zkStudyClub - Reef: Fast Succinct Non-Interactive Zero-Knowledge Regex ProofsAlex Pruden
This paper presents Reef, a system for generating publicly verifiable succinct non-interactive zero-knowledge proofs that a committed document matches or does not match a regular expression. We describe applications such as proving the strength of passwords, the provenance of email despite redactions, the validity of oblivious DNS queries, and the existence of mutations in DNA. Reef supports the Perl Compatible Regular Expression syntax, including wildcards, alternation, ranges, capture groups, Kleene star, negations, and lookarounds. Reef introduces a new type of automata, Skipping Alternating Finite Automata (SAFA), that skips irrelevant parts of a document when producing proofs without undermining soundness, and instantiates SAFA with a lookup argument. Our experimental evaluation confirms that Reef can generate proofs for documents with 32M characters; the proofs are small and cheap to verify (under a second).
Paper: https://eprint.iacr.org/2023/1886
Goodbye Windows 11: Make Way for Nitrux Linux 3.5.0!SOFTTECHHUB
As the digital landscape continually evolves, operating systems play a critical role in shaping user experiences and productivity. The launch of Nitrux Linux 3.5.0 marks a significant milestone, offering a robust alternative to traditional systems such as Windows 11. This article delves into the essence of Nitrux Linux 3.5.0, exploring its unique features, advantages, and how it stands as a compelling choice for both casual users and tech enthusiasts.
Alt. GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using ...James Anderson
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The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
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- Maintenance of superior security standards and inherent policy enforcement with Authorization to Operate (ATO)
Development teams can ship efficiently and ensure applications are cyber ready for Navy Authorizing Officials (AOs). In this webinar, Sigma Defense and Anchore will give attendees a look behind the scenes and demo secure pipeline automation and security artifacts that speed up application ATO and time to production.
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- A fully editable and extendable library for grid component modelling;
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The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
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- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
1. Spaceflight Now | Delta Launch Report
Rockets leap into the 21st century with GPS upgrade
BY STEPHEN CLARK
SPACEFLIGHT NOW
Posted: May 18, 2014
Signaling a new chapter in the long-sought modernization of the U.S. Air Force's launch ranges,
Friday night's flight of a Delta 4 rocket was tracked via satellite instead of by radar in a move
officials say is a money-saving upgrade to the military's aging range infrastructure.
A special avionics system mounted on the 20-story launcher transmitted its location to controllers on
the ground using Global Positioning System navigation data. The Delta 4 rocket Friday happened to
be boosting a fresh GPS spacecraft into orbit to replenish the Air Force-run satellite fleet circling
Earth more than 12,000 miles up.
Walter Lauderdale, the mission director for Friday's launch, said United Launch Alliance's Atlas and
Delta rockets are transitioning to GPS metric tracking for range safety functions, which protect the
public and property should a launch vehicle veer off course.
All U.S. rockets carry a flight termination system to destroy the booster if a serious problem occurs.
The pyrotechnic destruct charge is commanded from the ground by an Air Force official who
monitors the rocket's flight path.
"For GPS metric tracking, there is an avionics box that's on the vehicle that sends down position
information about where the rocket is back to the range for them to track for public safety,"
Lauderdale told reporters before Friday's launch.
Most rockets launching from Cape Canaveral, Fla., and Vandenberg Air Force Base, Calif., have for
decades been tracked by a C-band radar. Each rocket is fitted with a C-band transponder which
helps the radar lock on to the launcher on its flight into space.
"It provides the same position information as if you used a C-band tracking radar, where you're
actually following and interrogating the rocket ... The GPS signal goes down to the rocket, in this
case for metric track, [and] it tells the range safety folks where the rocket is, so they can track that
the rocket is following its appropriate flight profile," Lauderdale said.
The GPS avionics unit completed a series of demonstration flights on previous rocket launches
before being permitted to take over as a primary tracking method.
According to Lauderdale, test launches of unarmed Minuteman missiles have used GPS metric
tracking before, but space launchers are just getting into it.
With the Delta 4 now GPS-capable, two more Atlas 5s will carry C-band tracking beacons before it
2. switches over to GPS metric tracking, Lauderdale said.
An Atlas 5 launch "at the end of July will be the last Atlas 5 to use the C-band radar; it flies out the
last of the C-band tracking beacons. For Atlas 5 launches after the one at the end of July, we'll also
be using only GPS metric tracking and will not require the C-band tracking radar as a mandatory
[range asset]," Lauderdale said.
Officials say GPS metric tracking adds to the accuracy of the position and velocity data received by
range safety officer during a launch. It is also cheaper because it means the C-band tracking radars
at Cape Canaveral and Vandenberg Air Force Base are no longer needed.
GPS metric tracking is a cornerstone of the Air Force's effort to create a more "responsive" launch
range. Finicky ground systems, many of which are based on 1950s or 1960s technology, occasionally
cause launch delays even when weather, the rocket and the payload are "go" for liftoff.
Budget cuts have also stretched the Air Force launch ranges, forcing managers to decommission
backup systems.
The perils of relying on antiquated technology in an era of lean funding was exhibited in late March,
when a fire damaged an Air Force-owned tracking radar at the Kennedy Space Center.
The fire kept two rocket launches, one carrying a U.S. national security satellite and another
ferrying supplies to the International Space Station, on the ground for more than two weeks as the
Air Force rushed a backup radar into service.
SpaceX officials have said the company is working on a GPS metric tracking capability for the Falcon
9 rocket, but a company spokesperson did not respond to an inquiry on the status of its
development.
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ment posted on ULA's website, the company's GPS metric tracking system is one of three
independent range tracking sources to help the Air Force range safety officer follow the flight path
of a rocket. Alongside the GPS data, the range safety officer uses telemetered inertial guidance data
and tracking information from a launch head skin track radar.
The GPS metric tracking system on the Delta 4 and Atlas 5 rockets receives satellite signals from
two L-band antennas mounted 180 degrees apart on the second stage, processes the data to
formulate its position and velocity, then transmits the information to the ground through an S-band
radio link for comparison to the launch vehicle's predicted location.
Before GPS metric tracking, engineers installed transmitters on rockets to allow them to send
telemetry to control centers through NASA's constellation of Tracking and Data Relay Satellites,
reducing reliance on a network of ground station scattered around the globe.
The next improvement under study by the Air Force is the introduction of autonomous on-board
flight safety systems, which would replace today's man-in-the-loop range safety paradigm. Instead of
requiring an engineer to send a manual destruct command to an errant rocket from the ground, a
computer on-board the launcher would do the job by itself.
An autonomous flight termination system flew on an Air Force Minotaur rocket launch from Virginia
in November in the first of what officials then said would be several test flights needed to certify the
technology.
4. Ultimately, simplified space-based ranges could eliminate the need for ground infrastructure,
allowing launch ranges to exist virtually anywhere in the world, officials said.
"The idea behind space-based range is you literally take all that range infrastructure, which is time-
consuming and costly, try to streamline it and put it on the rocket," a former Air Force space official
said.
Follow Stephen Clark on Twitter: @StephenClark1.