TAG: antennas

Antcom Discusses Unmanned Systems, Geodetic Survey Antennas at InterGeo

October 8, 2014By

Robert Dumont of Antcom Corporation discusses the company’s unmanned systems antennas and geodetic survey antennas while at the InterGeo Conference and Trade Fair held October 7-9 in Berlin. See more InterGeo videos at GPS World’s YouTube Channel. read more

Hemisphere GNSS Launches New Branding, Website

September 30, 2013By
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Today, Hemisphere GNSS introduced its new “Hemisphere” corporate branding and logo to reflect its global GNSS focus. The company is also announcing a new website that has been built from the ground up based on customer and partner input. In February 2013, Hemisphere GPS was renamed and incorporated as Hemisphere GNSS Inc. The company owns both names, but in order... read more

Innovation: Getting Control

February 1, 2013By
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Off-the-Shelf Antennas for Controlled-Reception-Pattern Antenna Arrays
The antenna is a critical component of any GNSS receiving equipment. It must be carefully designed for the frequencies and structures of the signals to be acquired and tracked. Important antenna properties include polarization, frequency coverage, phase-center stability, multipath suppression, the antenna’s impact on receiver sensitivity, reception or gain pattern, and interference handling. While all of these affect an antenna’s performance, let’s just look at the last two here. read more

This article is tagged with , and posted in From the Magazine, GNSS, Innovation

Raytheon UK Wins Contract for GPS Anti-Jam System

December 3, 2012By

Raytheon UK has been awarded a significant contract by the UK Ministry of Defence for delivery of a new GPS anti-jam antenna land system. The contract is for an undisclosed number of advanced systems for deployment in operational theaters spanning multiple vehicle platforms. This UOR (Urgent Operational Requirement) contract is the first award for Raytheon’s GPS Anti-Jam (AJ) Land product... read more

Innovation: GNSS Antennas and Humans

February 1, 2012By
FIGURE 6. Gain pattern of the patch antenna as measured by the measured C/N0 at all elevation angles as a function of antenna distance from body. Elevation angles [0º, 90º] have azimuths [180º, 360º], while elevation angles [90º, 180º] have azimuths [0º, 180º].

A Study of Their Interactions
A team of researchers from The University of Calgary report on tests conducted on two different types of GPS antennas operated in the vicinity of a human phantom — an artificial body with similar electromagnetic properties as that of a real human. read more

This article is tagged with , and posted in From the Magazine, GNSS, Innovation, OEM

Antenna-induced biases in GNSS receivers May 17, 2007

May 17, 2007By

By Inder Jeet Gupta It is well known that the phase center of a GNSS antenna can vary with the satellite direction. This phase center movement leads to aspect dependent carrier phase and code phase biases in the satellite signal. For precise geo-location, one needs to characterize the antenna-induced carrier and code phase biases over the upper hemisphere. In the... read more

This article is tagged with , and posted in OEM, Tech Talk