Receiver Design

Retired GIOVE-A Helps SSTL Demo High-Altitude GPS Fix

November 30, 2012By
Galileo's GIOVE-A retired in June 2012

An experimental GPS receiver, built by Surrey Satellite Technology Limited (SSTL), has successfully achieved a GPS position fix at 23,300 kilometers altitude – the first position fix above the GPS constellation on a civilian satellite. The SGR-GEO receiver is collecting data that could help SSTL to develop a receiver to navigate spacecraft in geostationary orbit (GEO) or even in deep... read more

What Is Achievable with the Current Compass Constellation?

November 1, 2012By
001_GPS_November12_web

Data from a tracking network with 12 stations in China, the Pacific region, Europe, and Africa demonstrates the capacity of Compass with a constellation comprising four geostationary Earth-orbit (GEO) satellites and five inclined geosynchronous orbit (IGSO) satellites in operation. The regional system will be completed around the end of 2012 with a constellation of five GEOs, five IGSOs, and four... read more

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

Innovation: Software GNSS Receiver

September 1, 2012By
Fig9

An Answer for Precise Positioning Research
In this month’s “Innovation,” we look into the development and capabilities of one modern software GNSS receiver in an effort to answer the question “What is the ideal GNSS receiver for precise positioning research?” read more

This article is tagged with and posted in From the Magazine, Innovation, Manufacturing, Receiver Design

Low-Complexity Spoofing Mitigation

December 1, 2011By
Figure 3. Null steering toward the spoofer signals.

Most anti-spoofing techniques are computationally complicated or limited to a specific spoofing scenario. A new approach uses a two-antenna array to steer a null toward the direction of the spoofing signals, taking advantage of the spatial filtering and the periodicity of the authentic and spoofing signals. It requires neither antenna-array calibration nor a spoofing detection block, and can be employed as an inline anti-spoofing module at the input of conventional GPS receivers. read more

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

Consumer GPS/GLONASS: Accuracy and Availability Trials of a One-Chip Receiver in Obstructed Environments

December 1, 2011By
figure5-opener

A one-chip multiconstellation GNSS receiver, now in volume production, has been tested in severe urban environments to demonstrate the benefits of multiconstellation operation in a consumer receiver. Bringing combined GPS/GLONASS from a few tens of thousands of surveying receivers to many millions of consumer units, starting with satnav personal navigation devices in 2011, followed by OEM car systems and mobile phones, significant shifts the marketplace. The confidence of millions of units in use and on offer should encourage manufacturers of frequency-specific components, such as antennas and SAW filters, to enter volume mode in terms of size and price. read more

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

Space-Time Equalization Techniques for New GNSS Signals

October 1, 2011By
Figure_3

Spatial and temporal information of signals received from multiple antennas can be applied to mitigate the impact of new GPS and Galileo signals’ binary-offset sub-carrier, reducing multipath and interference effects. read more

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

Future Wave: L1C Signal Performance and Receiver Design

April 1, 2011By
L1C-3

The new GPS L1C signal will be broadcast by the Block III satellites, with first launches as early as 2014. L1C innovations significantly enhance PNT performance as well as interoperability with other GNSS signals. The authors describe the benefits of its new features and how best to make use of each one. read more

This article is tagged with , , and posted in Receiver Design, Signal Processing

Dynamic Duo: Combined GPS/GLONASS Receivers in Urban Environments

January 1, 2011By
Aerial view of downtown Calgary from the southwest, with test trajectory shown in red.

The impact of adding GLONASS to HS-GPS is assessed using a software receiver operating in an actual urban canyon environment. Results are compared with standard and high sensitivity GNSS receivers and show a significant improvement in the availability of position solutions when GLONASS is added. An assisted high sensitivity receiver architecture is introduced which enables high fidelity signal measurements even in degraded environments. read more

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