SBAS and RNSS

Evaluating the Performance of Navigation Payloads
November 17, 2014

Evaluating the Performance of Navigation Payloads

As a navigation satellite transmits multiple signals on single frequency (e.g., Open Service and Restricted Service over L5 Band), these are combined on a common carrier to comprise a composite signal. This composite signal passes through navigation payload subsystems such as an up-converter, traveling wave tube amplifier (TWTA), filters, and so on. These subsystems may introduce adverse effects on the signal, such as amplitude and phase distortion, nonlinear effects, gain imbalance, IQ imbalance, and phase noise.

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By Inside GNSS
Tracking IRNSS Satellites

Tracking IRNSS Satellites

Figure 2: Sky plot showing position of IRNSS and GPS satellites over Helsinki Finland on November 6, 2014 at 16:10 local time.

The Indian Regional Navigation Satellite System (IRNSS)] is designed as a stand-alone regional navigation system with a primary service area extending up to 1,500 kilometers from the Indian land mass. Finland lies north of 60°N latitude more than 5,000 kilometers away from India, as shown in Figure 1 (see photo at the top of this article).

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By Inside GNSS
Topcon Engineers Track New GLONASS Signal
November 14, 2014

Topcon Engineers Track New GLONASS Signal

Implementation of code-Phase structures for GLONASS signals ?/?, L2C and L3

Topcon Positioning Group has announced that its latest GNSS reference receiver has tracked a new signal from the GLONASS constellation.

The GLONASS-M 55 satellite was launched in June and is equipped
with an experimental payload capable of transmitting CDMA signals in the
Russian GNSS system’s L3 frequency band centered at 1202.025 MHz. According to the company, Topcon engineers successfully tracked the signal using the NET-G5
receiver during a series of recent tests at the Topcon Technology Center
in Moscow, Russia.

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By Inside GNSS
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Tallysman Launches Smart GPS-GLONASS Antenna
November 6, 2014

Tallysman Launches Smart GPS-GLONASS Antenna

Tallysman has introduced the TW5340 “smart” antenna that pairs Tallysman‘s Accutenna technology with STMicroelectronics’ Teseo II GNSS receiver.

The TW5340 is a multi-constellation GNSS antenna that provides simultaneous GPS/GLONASS/SBAS reception and is designed for use in professional grade applications such as precision timing, network synchronization, or low-current  and tracking/positioning applications.

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By Inside GNSS
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JNC - Joint Navigation Conference 2015
October 22, 2014

JNC – Joint Navigation Conference 2015

The 2015 JNC – Joint Navigation Conference will take place June 22-25, 2015 at the Renaissance Orlando at SeaWorld in Orlando, Florida. The U.S. ONLY CLASSIFIED sessions will be held June 25 at Shades of Green Walt Disney World.

The abstract submission deadline has passed.

Early bird registration ends May 20, 2015.

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By Inside GNSS
IGNSS 2015: International GNSS Society Symposium

IGNSS 2015: International GNSS Society Symposium

The IGNSS 2015 symposium on GPS/GNSS and industry exhibition will take place at the Outrigger Hotel in Gold Coast, Queensland, Australia from July 16 to 18, 2015. The conference venue is one block from the famous Surfer’s Paradise Beach.

The deadline for abstracts is February 9, 2015.

Registration will be open at the end of March, 2015. Early bird registration ends May 18, 2015.

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By Inside GNSS
ICAO, RTCA Seek New Protections for GNSS Aviation Receivers
October 16, 2014

ICAO, RTCA Seek New Protections for GNSS Aviation Receivers

GPS pseudolite used in experiment at University of New South Wales Satellite Navigation and Positioning Lab

International aviation officials have asked U.S. experts to consider updating standards for GNSS aviation receivers to improve their ability to withstand interference from repeaters, pseudolites, and jammers.  

Repeaters — generally used to extend navigation signals inside buildings where they would otherwise be blocked — rebroadcast GNSS satellite signals and therefore operate in the same frequency band. Although useful within a building,  care must be taken to confined the repeater’s signal lest it confuse other receivers operating nearby.

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By Inside GNSS
India Space Officials Release IRNSS ICD
September 30, 2014

India Space Officials Release IRNSS ICD

IRNSS-1B satellite in clean room. ISRO photo

A signal-in-space (SIS) interface control document (ICD) for the standard positioning service (SPS) of the Indian Regional Navigation Satellite System (IRNSS) is available for download from the Indian Space Research Organization (ISRO) website.

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By Inside GNSS
FAA Begins Opening Airspace to Unmanned Aircraft as NextGen, ADS-B Draw Fresh Scrutiny
September 26, 2014

FAA Begins Opening Airspace to Unmanned Aircraft as NextGen, ADS-B Draw Fresh Scrutiny

Aviation officials Thursday (September 25, 2014) for the first time approved the use of unmanned aircraft for commercial filming in the United States, opening the door to what is expected to be a slow-building gold rush to the skies.

Six companies received exemptions from the existing rules, which generally ban the commercial use of unmanned aerial systems or UAS. The exemptions were granted to RC Pro Productions Consulting LLC dba Vortex Aerial, Aerial MOB LLC, Astraeus Aeria, HeliVideo Productions LLC, Pictorvision Inc., and Snaproll Media LLC.

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By Inside GNSS
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