Receiver Design

Testing Software Receivers

December 1, 2009By

To meet the challenges inherent in producing a low-cost, highly CPU-efficient software receiver, the multiple offset post-processing method leverages the unique features of software GNSS receivers to greatly improve the coverage and statistical validity of receiver testing compared to traditional, hardware-based testing setups, in some cases by an order of magnitude or more. read more

This article is tagged with and posted in LBS/Wireless, Mobile Devices, Receiver Design

The Smartphone Revolution

December 1, 2009By
SmartPhones

Seven technologies put GPS in mobile phones around the world. Here is the how and why of location’s entry into modern consumer mobile communications. read more

This article is tagged with , and posted in LBS/Wireless, Mobile Devices, Receiver Design

Higher Timing Accuracy, Lower Cost

November 1, 2009By
AURORA BOREALIS seen from Churchill, Manitoba, Canada. Ionospheric scintillation research can benefit from this new method.

Inside a typical GNSS receiver, the estimate of the error in the local oscillator is formed as a component of the navigation solution, which is in turn based on the output of each satellite-tracking channel propagating its estimate of carrier and code measurements to a common future point. But this method limits the resolution with which the noise of the local oscillator can be quantified. To bypass this shortcoming requires a method of coherently gathering information about the phase change in the local oscillator across all available satellite signals: to use the same samples simultaneously for all satellites in view to estimate the center-point phase error common across the visible constellation. We explore how. read more

This article is tagged with and posted in Receiver Design, Simulators & Tools, Timing

Real-Time Software Receivers: Challenges, Status, Perspectives

September 1, 2009By
FIGURE 2. Single-instruction single-data versus single-instruction multiple-data.

By Marcel Baracchi-Frei, Grégoire Waelchli, Cyril Botteron, and Pierre-André Farine The idea of a software receiver is to replace the data processing implemented in hardware with software and to sample the analog input signal as close as possible to the antenna. Thus, the hardware is reduced to the minimum — antenna and analog-to-digital converters (ADCs) — while all the signal processing... read more

This article is tagged with and posted in GNSS, Receiver Design

Innovation: GNSS Radio (PDF)

May 1, 2006By

Innovation: GNSS Radio: A System Analysis and Algorithm Development Research Tool for PCs (PDF) By J.K. Ray, S.M. Deshpande, R.A. Nayak, and M.E. Cannon Published: May 2006 GPS World In this month’s column, a team of researchers from India and Canada describe a GNSS radio and how they have used it to develop and test algorithms for processing both legacy... read more

This article is tagged with and posted in Algorithms & Methods, Innovation, Receiver Design

Innovation: Satellite Navigation Evolution: The Software GNSS Receiver (PDF)

January 1, 2005By

Innovation: Satellite Navigation Evolution: The Software GNSS Receiver (PDF) By Glenn MacGougan, Peter Ludvig Normark, and Christian Stahlberg Published: January 2005 GPS World In this month’s Innovation, we look at a further evolution of the GNSS receiver which offers the promise of flexibility, adaptability, and cost-effectiveness.—Richard Langley read more

This article is tagged with and posted in GNSS, Innovation, Receiver Design