SiRF Technology, Inc. was a pioneer in the commercial use of GPS technology for consumer applications. The company was founded in 1995 and was headquartered in San Jose, California. The company was acquired by CSR plc in 2009. On April 5, 2013, the formerly British-owned American-based company SiRF was acquired by the American company The Blackstone Group. SiRF manufactured a range of patented GPS chipsets and software for consumer navigation devices and systems. The chips are based on ARM controllers integrated with low-noise radio receivers to decode GPS signals at very low signal levels . SiRF chips also support SBAS to allow for differentially corrected positions. Wikipedia.
Jia T.,SiRF |
Buehrer R.M.,Virginia Polytechnic Institute and State University
IEEE Transactions on Mobile Computing | Year: 2011
In this work, we propose a set-theoretic approach to collaborative position location for wireless networks. The proposed method borrows the concept from the parallel projection method (PPM), originally developed for signal recovery with inconsistent convex feasibility sets, modifies and extends the technique to an iterative and distributed numerical algorithm to estimate node locations, based on incomplete and noisy internode distance estimates. We demonstrate that in the case of noncollaborative position location, the proposed method is analytically equivalent to the parallel implementation of Kaczmarz Algorithm that is guaranteed to converge to a local minimizer and thus a stationary point. For collaborative position location, the proposed iterative PPM is computationally much more efficient than existing methods such as SDP and MDS-MAP, while achieving comparable or better localization accuracy and robustness to non-line-of-sight (NLOS) bias. Finally, our proposed method can be implemented in a parallel and distributed fashion, and is scalable for large network deployment. © 2011 IEEE. Source
News Article | March 25, 2008
GPS chip maker SiRF Technology has reduced first-quarter sales estimates and implemented a cost-savings plan that will cost about 50 people their jobs and result in the closure of SiRF’s offices in Stockholm and South San Francisco. Aside from general economic malaise softening demand for personal navigation systems, the other whammy for SiRF was a lousy mobile-TV market. According to the release, it’s getting out of the market altogether. “Although SiRF has made considerable progress on the development of its mobile TV technology, the market for mobile TV has been slow to ramp up. In view of this, the Company has stopped further product developments in the mobile TV space and will focus its efforts on its core business.” Much of the data has pointed to this, but companies, such as Broadcom, which has pushed its mobile TV chips into higher-volume production and Dish Networks, which recently bid $712 million for spectrum that can be used for mobile television, still haven’t gotten the memo. Either they can afford to play now at a loss, in hopes of a slow market eventually arriving, or they know something we don’t.
News Article | March 25, 2008
SiRF Technology (SIRF), a San Jose, Calif.-based maker of GPS chips, this morning said it was cutting jobs and trying to restructure its business due to softening consumer demand. Already the worst performing tech stock for the year, shares of SiRF nosedived in early trading this morning. “SiRF experienced greater-than-expected softness in product demand from its customers, especially in the PND, or Personal Navigation Devices market,” the company said in a press release. SiRF is the canary in the GPS coal mine. In other words, the GPS device market has hit the skids and we should expect more bad news, and more dominoes to tumble. Why? Look at SiRF’s customers: Tom Tom, Magellan, NAVIGON, Sony and European white-label GPS maker, Binatone. If the macroeconomic trends are putting a damper on SiRF and its chip-buying posse, it isn’t hard to extrapolate and see trouble for Garmin as well. Looking further out onto the horizon, I think the standalone GPS device market is going to get cannibalized by mobile phones, which are getting increasingly sophisticated when it comes to personal navigation functionality. GPS devices were among the hottest-selling consumer items this past holiday season, with sales up 214 percent and revenues up 488 percent, respectively, year-over-year.
News Article | February 10, 2009
CSR, formerly known as Cambridge Silicon Radio, has agreed to buy American GPS (global positioning system) chip expert, SiRF. The transaction values SiRF at £91 million, and gives SiRF shareholders 27 percent of the merged company. SiRF’s SiRFstar GPS chips are used in Tom Tom, Garmin, Palm and other system, while CSR is best known as a Bluetooth chip maker. CSR has been focusing on making combination chips, adding Wi-Fi, FM radio and GPS to its Bluetooth processors. The combined company will still be based in Cambridge UK. “GPS is next big growth market – and we are putting together world leader in GPS with world leader in Bluetooth,” Jeffrey Torrance, vice president of corporate development at CSR told eWEEK Europe. At the moment, only 20 percent of phones, at the high end of the market, have GPS in them, but that is expected to double in the next few years, he said. Phones are developing into a two-chip system, said Torrance. People had thought at one time that Bluetooth would eventually be absorbed into the main phone chip, so the phone is based around one processor and specialist companies like CSR would be out in the cold. Instead, things have evolved differently, with other radio technologies, such as Wi-Fi, FM and now GPS joining into the Bluetooth chip, said Torrance: “The phone is building up like a binary star – one chip for voice and the other is the connectivity centre. Our goal is to bring all those connectivity technologies together into one connectivity powerhouse.” CSR already has GPS, but has concentrated on eGPS, a form that uses triangulation between cellular base stations to locate a GPS handset, instead of the satellites used in conventional GPS. The two technologies are complementary, and can combine in A-GPS, where cellular location assists the conventional GPS: “It’s a continuum,” said Torrance.
News Article | February 10, 2009
CSR, formerly Cambridge Silicon Radio, has bought SiRF, an American GPS chip company, in a £91 million share transaction giving SiRF shareholders 27 percent of the new enlarged CSR. Two SiRF directors will get seats on the board. SiRF is best known for its SiRFstar range of GPS chips, which are used by Tom Tom, Garmin, Palm and others. CSR has traditionally specialised in Bluetooth chips, more recently concentrating on highly integrated all-in-one circuits that combine Bluetooth with other radio functions like Wi-Fi and FM reception. Lately, it has been promoting 802.11n for mobile applications, although industry uptake has yet to take off. The company has confirmed to me that it will continue to be called CSR, and will continue to have its HQ in Cambridge, UK.