Design & Test

Spirent Technical Interchange Features Hands-on Demonstrations

February 8, 2013By

Next month Spirent is hosting a meeting with hands-on training sessions on GNSS simulation equipment led by Spirent engineers. The 2013 Spirent Federal 2013 GNSS Technical Interchange Meeting will be held March 19-21 at the DoubleTree Hotel Anaheim-Orange County, in Orange, California. March 19 and 20 are for general participation. The third day, March 21, features FOUO (For Official Use... read more

Symmetricom Enhances SSU 2000 Platform with GLONASS

February 5, 2013By

Symmetricom, Inc. today announced two new capabilities for its SSU 2000 Synchronization Supply Unit: a GLONASS timing reference that uses signals from the satellite navigation system operated by the Russian Aerospace Defense Forces, and Synchronous Ethernet (SyncE), an ITU-T synchronization standard that delivers frequency synchronization over the Ethernet physical layer. This enhanced version of the SSU 2000 will be the... read more

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LabSat 2 Customers Offered Free BeiDou Upgrade

February 4, 2013By

LabSat 2 now has the ability to record and replay satellite signals from the rapidly expanding Chinese navigation system, BeiDou. LabSat 2 users can now record and replay any combination of two channels from the three available constellations, GPS, GLONASS, and Beidou. Existing LabSat 2 users can  download the latest firmware (v2.0.0) and PC software (v2.6.14) to add this functionality... read more

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Anti-Jam Protection by Antenna

February 1, 2013By
Figure 6. Outdoor jamming test campaign.

A controlled radiated pattern antenna can be an effective way to protect GPS receivers against jamming. A new CRPA, composed of seven elements, works on the E5a, E5b, E6, L2, and L1 bandwidths. This article reports on radiation pattern measurements of the array in a test facility. read more

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Expert Advice: BeiDou, How Things Have Changed

February 1, 2013By

Economically, the System Differs Significantly from Its GNSS Cousins John W. Lavrakas In May 2007, I authored an article in GPS World looking ten years into the future and envisioning how the GNSS field would operate at that then-distant time. Reviewing my assessments, I see that I was both accurate and wide of the mark with my predictions. The prediction... read more

Signal Decoding with Conventional Receiver and Antenna

February 1, 2013By
Figure 7  Signal-to-noise-density ratio of E1 (red), E5a (magenta), E5b (blue), and E6 (green) code tracking of Galileo IOV satellite PRN 11 on December 21–22, 2012.

A method of decoding an unknown pseudorandom noise code uses a conventional GNSS antenna and receiver with modified firmware. The method was verified using the signals from the Galileo In-Orbit Validation satellites. 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

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Call for Participation: Round 2 of NGS Kinematic GPS Challenge

January 30, 2013By

NOAA’s National Geodetic Survey (NGS) is conducting a 12-year project, called Gravity for the Redefinition of the American Vertical Datum (GRAV-D), to redefine the vertical datum of the United States by flying airborne gravity missions. The accuracy of the resulting vertical datum depends directly on the quality of the aircraft’s GNSS position solutions. In August 2010, NGS issued a Kinematic... read more