GPS chip optimised to avoid jamming and LTE interference

August 16, 2012 // By Nick Flaherty
CSR has launched a quad-GNSS offering exclusive adaptive continuous tracking power management technology, MEMS inputs, LTE immunity and enhanced active jammer removal.

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,