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GPS chip optimized to avoid jamming and LTE interference

Nick Flaherty -August 16, 2012

The SiRFstarV 5t has been designed from the ground up to provide high immunity to interference from LTE (long-term evolution) radio signals, giving mobile device manufacturers confidence in its ability to coexist in their designs with LTE. Coexistence of LTE with GPS, GLONASS and other GNSS signals is critical for continuous location awareness and use of location-based services, and CSR has implemented a number of mechanisms to boost immunity to LTE interference in the SiRFstarV 5t to ensure the most satisfying user experience.

The architecture also includes improved active jammer removal, a unique CSR technology first introduced with the SiRFstarIV architecture, which improves location performance by continually tracking and eliminating radio interference from up to eight sources, a critical requirement when GNSS devices are in close proximity to other electrically noisy devices like those found in a mobile handset.

“With GPS, GLONASS, Galileo and Compass system capabilities, our new power-saving technology and the other SiRFstarV features, the SiRFstarV 5t tracker is perfect for mobile device OEMs looking to create new products that take location and navigation to the next level for an enhanced user experience,” said Dave Huntingford, director of location product line marketing at CSR. “We believe the SiRFstarV 5t again demonstrates CSR leadership in providing best-in-class location solutions that meet or exceed the demanding requirements of smartphone OEMs and operators.”

The SiRFstarV 5t is already in use by LG Electronics for its first quad-core smartphone, the LG Optimus 4X HD, which takes advantage of the device’s GLONASS support and high sensitivity.

Optimised for size- and power-constrained applications, the SiRFstarV 5t boasts a number of enhanced SiRFstarV architectural features – from quad-GNSS support and MEMS-aiding, to improved sensitivity and interference rejection to small size and low BOM count - that result in significant location performance and power consumption improvements, reduced package size, easier integration and lower-cost implementation. The SiRFstarV 5t supports A-GPS and A-GLONASS in MSA and MSB modes, and has been tested for all major carrier requirements, including SUPL1.0 and SUPL2.0, and offers improved 3GPP acquisition and tracking margins. SiRFInstantFix extended ephemeris technology for GPS and GLONASS is also supported.

The SiRFstarV 5t supports all four major global navigation satellite systems (GNSS). With its 24 additional satellites, GLONASS provides a valuable augmentation to GPS and enables the SiRFstarV 5t to boost location performance, especially in urban canyons, for the most demanding applications by increasing service availability, reducing observation time and making solutions more precise. The SiRFstarV 5t additionally supports Galileo and Compass systems, when they become available, with a software upgrade for even greater performance and ensured compliance to existing and future requirements of the world’s major GNSS systems.

The SiRFstarV 5t also introduces CSR’s exclusive TricklePowerII technology, an improved intelligent power management system that can deliver significant power savings compared to other location solutions for continuous 1-Hz navigation. TricklePowerII continually measures the strength of the available satellite signals and dynamically adjusts the chip’s power consumption to just the right amount to achieve optimal location performance without wasting power.

With many new mobile devices including MEMS (micro-electro-mechanical systems) sensors, the SiRFstarV 5t is able to usetilise data from these sensors to improve navigation accuracy and reduce power. “Because of its MEMS-aiding and active jammer removal technologies, the SiRFstarV 5t is demonstrably superior to other solutions for providing continuous location awareness for smartphones and other mobile devices,” said Blake Bullock, location product line manager at CSR. “Combined with its GLONASS support and high sensitivity, this CSR device offers a compelling, high-performance location solution.”

The complete CSR solution includes SiRFNav software running on the host CPU to calculate the precise position, velocity and time and provide complete control of GNSS operation, including navigation, assistance and nav-aiding. The solution requires minimal OS-dependent host system loading during tracking, simplifying system integration, and supports a wide variety of CPUs and operating systems.

The SiRFstarV 5t quad-GNSS tracker product (part number: CSRG05TA03-ICJE-R) is available now in production quantities.

For more information, visit www.csr.com.

This article originally appeared in EE Times Europe.

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