Global Navigation Satellite Systems Engineering, Policy, and Design
The GPS Aided Geo Augmented Navigation (GAGAN) system was developed by the Indian Space Research Organization (ISRO), together with Airports Authority of India (AAI), to deploy and certify an operational satellite-based augmentation system (SBAS). The system’s service area covers the Indian Flight Information Region (FIR), with the capability of expanding to neighboring FIRs.
By Inside GNSS
Figures and TablesIn satellite navigation, the user receiver finds its position by measuring its distance to satellites and knowledge of the satellite position. The distance is measured by ranging, i.e., finding the delay of the signal from the transmitter to the receiver. The delay will comprise of payload hardware delay and the geometric range delay. Hence, the payload delay of the signal from generation to radiation is very important and needs to be transmitted in navigation data.
By Inside GNSS
Small GPS jammers, particularly the “personal privacy devices” readily available on the Internet, pose one of the greatest risks to the nation’s critical infrastructure, according to a now-public Homeland Security assessment.
By Dee Ann Divis
Dordrecht, Netherlands–based KCS BV has extended its TraceME product line with a low-budget track-and-trace module based on the company’s LoRa technology.
The TM-900/N1C1 module is the latest development in KCS’s TraceME GPS track-and-trace product line. The product is targeted for tracking and tracing a variety of objects, including livestock, and for personal use.
One of 12 magnetograms recorded at Greenwich Observatory during the Great Geomagnetic Storm of 1859
1996 soccer game in the Midwest, (Rick Dikeman image)
Nouméa ground station after the flood
A pencil and a coffee cup show the size of NASA’s teeny tiny PhoneSat
Bonus Hotspot: Naro Tartaruga AUV
Pacific lamprey spawning (photo by Jeremy Monroe, Fresh Waters Illustrated)
“Return of the Bucentaurn to the Molo on Ascension Day”, by (Giovanni Antonio Canal) Canaletto
The U.S. Naval Observatory Alternate Master Clock at 2nd Space Operations Squadron, Schriever AFB in Colorado. This photo was taken in January, 2006 during the addition of a leap second. The USNO master clocks control GPS timing. They are accurate to within one second every 20 million years (Satellites are so picky! Humans, on the other hand, just want to know if we’re too late for lunch) USAF photo by A1C Jason Ridder. 
Detail of Compass/ BeiDou2 system diagram
Hotspot 6: Beluga A300 600ST
1. DÉJÀ VU
Annapolis, Maryland and Kings Point, New York USA
For an organization with its name, the Federal Communications Commission (FCC) is a remarkably opaque public entity.
Such is the case with the agency’s inaction on requests by foreign GNSS services to waive the so-called FCC Part 25 rules that require licensing of non-Federal receive-only Earth stations (e.g., GNSS receivers) operating with non-U.S. licensed space stations (i.e., satellites).
Although at least one such request has reportedly been submitted, the FCC has not even acknowledged it, let alone moved to render a decision on the request.
By Inside GNSS
Riley and his son, Ben.Return to main article: Stuart Riley: Right Turn from the Wrong Path
COMPASS POINTS
Professional Path
Riley received a Ph.D. in electrical engineering at the University of Leeds (United Kingdom) where he then worked as a research fellow in 1994–5. After that, he joined Trimble Navigation Ltd. as a GNSS receiver designer. He is based in Sunnyvale, California, where since 2010 he has served as the company’s engineering director
By Inside GNSS
Return to main article: "eCall: Coming Soon to a Highway Near You"
Return to main article: "eCall: Coming Soon to a Highway Near You"
Return to main Working Papers article: "Code Shift Keying"
By Inside GNSS
Return to main Working Papers article: "Code Shift Keying"
By Inside GNSS
Return to main Working Papers article: "Code Shift Keying"
By Inside GNSS
Return to main Working Papers article: "Code Shift Keying"
By Inside GNSS
