Global Navigation Satellite Systems Engineering, Policy, and Design
Champion Instruments has released its new choke-ring antenna. The unit has an integrated GSM/GRPS modem and features a stable antenna phase center (APC) that is tailored for continuously operating reference station (CORS) base stations, the company said.
By Inside GNSS
Septentrio has received a contract from the Jet Propulsion Laboratory (JPL) for 35 PolaRx5 GNSS receivers, the company said. The receivers, which consist of 25 reference stations and 10 timing instruments, will be used in the NASA Global GNSS Network (GGN).
In other company news, Septentrio rolled out its new PolaRx5TR GNSS receiver. The unit has 544 hardware channels, features a calibration circuit, and supports all major constellations including GPS, GLONASS, Galileo, BeiDou, QZSS, and IRNSS, the company said.
By Inside GNSS
IFEN has announced its new NCS TITAN multi-GNSS, multi-frequency and multi-RF output simulator.
With up to 256 channels and up to four RF outputs per chassis, the TITAN design avoids the extra complexity and cost of using additional signal generators or intricate architectures involv¬ing several hardware boxes, IFEN says, which improves reliability without compromising functionality.
By Inside GNSS
The U.S. Air Force’s 2nd Space Operations Squadron (2SOPS) at the 50th Space Wing, Schriever Air Force Base, Colorado, has moved the longest-serving GPS satellite, space vehicle number (SVN) 23, into a disposal orbit several hundred miles above the operational GPS constellation.
The satellite, which was launched on November 26, 1990, had a rough start, the Air Force said. After early-orbit operations and initial stabilization in December 1990, SVN 23’s solar array stopped working.
By Inside GNSSHow do you win when you are really losing?
Play a different game, move the goalposts, change the rules.
For several years now, a series of would-be wireless broadband service providers have been attempting to convince the Federal Communications Commission (FCC) to repurpose radio frequency spectrum near the GPS L1 band.
Past efforts have failed because of the transmissions’ demonstrated harmful effects on GPS and other GNSS signals. Now a new contender is trying to gain FCC’s approval by changing the way that those effects are measured.
By Inside GNSS
Dr. Kyle O’Keefe, University of Calgary
In the beginning, there was just one GNSS — the Global Positioning System — and just one fully available signal on the L1 frequency.
Eventually, some clever scientists discovered how to exploit certain characteristics of the encrypted L2 signal to come up with so-called codeless and semi-codeless techniques that enabled dual-frequency positioning. This hastened the development of user equipment that used the carrier phase of signals as well as the code to deliver high-precision results.
By Inside GNSS
Working Papers explore the technical and scientific themes that underpin GNSS programs and applications. This regular column is coordinated by Prof. Dr.-Ing. Günter Hein, head of Europe’s Galileo Operations and Evolution.
By Günter W. Hein
Q: Are there low-cost and low-weight options for GNSS IF storage?
By Inside GNSS
It has been a long journey to success for Mikel M. Miller, the U.S. Air Force’s lead scientist for positioning, navigation, and timing (PNT) science and technology development.
By Inside GNSS
The Galileo E6 signal is centered at 1278.75 MHz, and comprises three signals: an authorized signal (E6A, the publicly regulated service, PRS plus two civilian signals), a data component (E6B), and a pilot component (E6C). Both E6B and C are modulated using binary-phase shift keying (BPSK) code division multiple access (CDMA) memory codes, having lengths of 5,115 chips and chipping rates of 5.115 Mcps.
By Inside GNSS
Real-time position accuracy, achievable in dense urban areas using low-cost equipment, is currently limited to tens of meters. If this could be improved to five meters or better, a host of potential applications would benefit. These include situation awareness of emergency, security and military personnel and vehicles; emergency caller location, mobile mapping, tracking vulnerable people and valuable assets, intelligent mobility, location-based services and charging, augmented reality; and enforcement of curfews, restraining orders and other court orders.
By Inside GNSS
Reasonable Expectations of Privacy and a discussion of privacy in the United States typically begins with the Fourth Amendment of the U.S. Constitution, which provides that “[t]he right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated.” In U.S. v Katz, the U.S. Supreme Court found that this Fourth Amendment protection created an individual’s constitutional right to privacy.
By Ingo Baumann
