receiver

Intermodulation Effects: Another Perspective on LightSquared Interference to GPS
June 25, 2011

Intermodulation Effects: Another Perspective on LightSquared Interference to GPS

Much of the research into the possible effects of the planned LightSquared cellular broadband transmissions near the GPS L1 band have focused on the saturation of the front end of GPS receivers caused by the high power of the terrestrial LightSquared base stations. In this article, an engineer with a long history in broadcast digital television takes a look at the likely effects on GPS receivers of third-order intermodulation products created by the LightSquared signals.

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By Inside GNSS
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June 24, 2011

Senate Proposals for GPS Receiver Standards Won’t Solve LightSquared Issue

LightSquared’s proposed broadband service may cause trouble for GNSS receivers, such as this one, that use commercial satellite augmentation services.

The Senate is considering establishment of receiver standards as part of a wide-ranging effort to find more frequencies for wireless broadband services, a move that could ultimately result in expensive new requirements for the GPS community.

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By Inside GNSS
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After Seeking FCC Extension, LightSquared Has a New Plan for GPS
June 21, 2011

After Seeking FCC Extension, LightSquared Has a New Plan for GPS

Results of John Deere test of LightSquared’s effect on high-precision GPS receivers

In what looks like a pre-emptive strike in the wake of extensive evidence that its proposed terrestrial wireless broadband transmissions will interfere with GPS receivers, LightSquared today (June 20, 2011) proposed to solve the problem by cut the power of its base stations in half and temporarily use a bandwidth further away from GPS.

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By Inside GNSS
LightSquared Gets Two-Week Extension on GPS Interference Report; Congressman Calls on FCC to Rescind Waiver
June 15, 2011

LightSquared Gets Two-Week Extension on GPS Interference Report; Congressman Calls on FCC to Rescind Waiver

LightSquared graphic

With test results and congressional sentiment running against it, LightSquared has received a two-week extension for filing its report and recommendations, due to the Federal Communications Commission (FCC) yesterday (June 15, 2011), on likely interference to the GPS L1 band.

Meanwhile, a congressional critic of LightSquared’s effort to roll out a 4G/LTE broadband cellular service adjacent to the GPS frequency has called on the agency to rescind its waiver of limits on the company’s plans to build a high-powered national network of terrestrial transmitters.

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By Inside GNSS
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IFEN: SX-NSR Receivers Shipping; Final GATE Certification
June 6, 2011

IFEN: SX-NSR Receivers Shipping; Final GATE Certification

IFEN’s SX-NSR Multi-Channel, Multi-GNSS Receiver

IFEN GmbH has begun shipping the first units of its new second-generation, multi-frequency and multi-GNSS software receiver — the SX-NSR.

The Poing, Germany–based company has also announced that the Galileo Test and Development Environment (GATE) facility that it instrumented and operates near Berchtesgaden for the German Space Agency (DLR) has been certified as a Galileo open-air test laboratory conforming to ISO 17025.

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By Inside GNSS
Qualcomm Adds GLONASS Capability to Chipsets

Qualcomm Adds GLONASS Capability to Chipsets

Qualcomm Incorporated has announced the company’s product support for the Russian GLONASS satellite system to enable the use of both GPS and GLONASS networks simultaneously for improved location performance.

The first GLONASS-capable phone is the MTS 945 from Chinese phone manufacturer ZTE developed with Russian chipset manufacturer AFK Sistema and powered by Qualcomm’s Snapdragon MSM7x30 chipset.

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By Inside GNSS
NovAtel, QinetiQ Collaborate on Anti-Jam GPS System
June 1, 2011

NovAtel, QinetiQ Collaborate on Anti-Jam GPS System

NovAtel Inc. in collaboration with QinetiQ Ltd. has developed GAJT (pronounced “Gadget”), the world’s first single-enclosure GPS anti-jam system small enough for light armored and other land-based military vehicles. GAJT combines NovAtel and QinetiQ technologies in a stand-alone, rugged enclosure that mounts to the exterior of vehicles.

GAJT is a seven element controlled reception pattern antenna (CRPA) that nulls jammers, ensuring GPS positioning capabilities are retained during combat, training, or other vehicle-based missions.

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By Inside GNSS
Test Results: LightSquared Would Cause Serious Interference to GPS Receivers
May 28, 2011

Test Results: LightSquared Would Cause Serious Interference to GPS Receivers

Las Vegas site for LightSquared/GPS tests

Tests of GPS receiver vulnerability to transmissions from terrestrial base stations in the proposed LightSquared 4G/LTE broadband service were scheduled to wrap up on May 27, but results as we post this message clearly indicate substantial adverse effects on GPS user equipment.

On June 1–2, the Technical Working Group (TWG) set up by the LightSquared-led working group mandated by the Federal Communications Commission (FCC) will have its first face-to-face meeting since the trials began to sort out the results.

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By Inside GNSS
Septentrio Announces AsteRx-m ‘Ultra-Compact’ GPS/GLONASS RTK Receiver
May 24, 2011

Septentrio Announces AsteRx-m ‘Ultra-Compact’ GPS/GLONASS RTK Receiver

Septentrio has announced plans to release the AsteRx-m, a low-power GPS/GLONASS dual-frequency RTK receiver that is smaller than a credit card.

The new board, which will begin shipping in the third quarter of 2011, is aimed specifically at integration in handheld devices, mobile computing platforms, and other solutions requiring high accuracy combined with low power in applications where space is at a premium. The new receiver covers the functionality range from GPS-L1 only to full GPS-GLONASS L1-L2

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By Inside GNSS
Hemisphere Reports Revenue Jump, Profit for Q1 2011

Hemisphere Reports Revenue Jump, Profit for Q1 2011

Steve Koles, president & CEO, Hemisphere GPS

Hemisphere GPS, Inc., has reported revenue growth of 41 percent and a return to profitability in the first quarter of 2011 for the three months ending March 31.

For the quarter, the Calgary, Alberta, Canada–based company generated $21.2 million in total revenues, compared to US$15.1 million in the first quarter of 2010. Revenues from all market segments increased in the first quarter of this year.

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By Inside GNSS
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