Inside GNSS: Engineering Solutions from the Global Navigation Satellite System Community
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Inside Unmanned Systems
Thought Leadership Series
Working Papers • January/February 2016

GNSS Satellite-Based Augmentation Systems

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.

With the support of the European Space Agency (ESA), a European team designed a frequency- and time-transfer process and validated its performance in a complex navigation test bed. This two-way time-transfer technology took advantage of the following:

GNSS Solutions • January/February 2016

What is Doppler collision and is it a problem in GNSS?

Q: What is Doppler collision and is it a problem in GNSS?

A: Doppler collision is a physical effect in code-division multiple access (CDMA) systems where code measurement errors are observed due to cross-correlation effects. Doppler collision may occur when the Doppler frequency between signals from two different transmitters is smaller than the code lock loop bandwidth. 

Inside GNSS • January/February 2016

GAGAN — India’s SBAS

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. 

Inside GNSS • January/February 2016

Measuring Navigation Payload Absolute Delay

In 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. 

January 15, 2016

GNSS Satellites Fill Launch Manifest

It will be a busy few weeks for GNSS satellite launches in January and February.

Up next is the Wednesday (January 20, 2016) is a launch of the fifth spacecraft for the Indian Regional Navigation Satellite System (IRNSS).  The Indian Space Research Organization plans to complete the IRNSS constellation with two additional launches in February and March.

November 6, 2016 - November 11, 2016
Sochi, Russia
May 18, 2016 - May 20, 2016
Changsha, China
May 23, 2016 - May 26, 2016
Rotterdam, Netherlands
June 28, 2016 - June 30, 2016
Barcelona, Spain
May 2, 2016 - May 6, 2016
Christchurch, New Zealand
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