Inside GNSS Media & Research

MAR-APR 2018

Issue link:

Contents of this Issue


Page 13 of 67

14 Inside GNSS M A R C H / A P R I L 2 0 1 8 B roadcom is doing things that no other company in the world is doing. Positioned right at the leading edge of GNSS-for-smartphone technologies, the company boasts an extensive portfolio of standalone GNSS receiver chips and combina- tion GNSS receiver and sensor-hub, or location-hub, chips. Already an industry leader in multi- constellation GNSS technologies, pres- ent in the latest, top-of-the-line hand- sets, Broadcom positively threw down the gauntlet last year with the inaugu- ration of its new BCM47755 chipset, the first dual-frequency GNSS chipset for smartphones. The unveiling, which came in the fall of 2017, led European GNSS Agency (GSA) Director Carlo des Dorides to suggest we might see a fully functional dual-frequency smart- phone as early as summer 2018. High-tech standout Broadcom has sold over one billion GNSS chipsets worldwide, leveraging all major global satellite navigation constellations and the full range of GNSS features, including Galileo's dual-frequency and innovative BOC modulation capabilities. Obviously Multi-Constellation Broadcom has always been a f irm believer in the cumulative value of each additional GNSS constellation. Speaking from his office in Madrid, Broadcom's Associate Director for GNSS Product Marketing Manuel del Castillo told us, "We initially support- ed GPS and then progressively added all of the other major GNSS constella- tions–GLONASS, BeiDou and Galileo. "We treat the different GNSS signals in an equivalent way, in terms of acquisi- tion and tracking, and interchangeabil- ity in subsequent fixes. Our motivation has always been accuracy and yield im- provements in challenging urban envi- ronments, where our customers have constantly pushed us to keep improving." The first Broadcom multi-constel- lation chip, adding GLONASS to GPS, came in 2011. "After that, in 2013, we added BeiDou," del Castillo said. "And in 2014, two years before Galileo Initial Ser v ices were announced, Broadcom added Galileo. "Our Galileo chip features a multi- purpose, sensor-hub and sensor-fusion software for use in smartphones and tablets, as well as 'system-on-chip' ar- chitecture, so we can meet the chal- lenge of always-on location with very low power. And of course our users benefit not only from the additional Galileo satellites, but from the new BOC modulation, which itself im- proves accuracy." In each case, del Castillo said, whether it was adding GLONASS, BeiDou or Galileo, similar processes were involved, including understand- ing the ICD, discussing implementa- tion and testing initial prototypes, de- veloping the B0 revision and carrying out receiver tests. "In the case of Galileo, however," he said, "there is a lot more support and clarity compared to previous constel- lations, in particular BeiDou. And Galileo is easier in terms of the RF part than GLONASS or BeiDou. On the other hand, Galileo's baseband is more complex due to the longer codes, sec- ondary codes and BOC modulation." Dual Frequency at Last Last year, Broadcom launched the chip that changed everything. "The BCM47755 in includes support for dual frequency in both GPS L1 and L5, and Galileo E1 and E5," said del Castillo. Until now, mobile positioning and navigation devices have been pow- ered by single-frequency GNSS re- ceivers. The expanded availability of L1/E1 and L5/E5 frequencies, thanks especially to Europe's Galileo constel- Broadcom pushing GNSS chipset boundaries MANUEL DEL CASTILLO GNSS Opinion Leaders The BOC modulation, the first attempt to modernize the GNSS signals, is now widely seen as opening a new field of research in navigation. Further developments have led to even more powerful AltBOC and MBOC solutions. Galileo's unique BOC feature BCM47755 Dual-Frequency GNSS Receiver

Articles in this issue

Links on this page

view archives of Inside GNSS Media & Research - MAR-APR 2018