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Seven technologies that put GPS in mobile phones around the world — the how and why of location’s entry into modern consumer mobile communications. By Frank van Diggelen, Broadcom Corporation Exactly a decade has passed since the first major milestone of the GPS-mobile phone success story, the E-911 legislation enacted in 1999. Ensuing developments in that history include: Snaptrack bought by Qualcomm in 2000 for $1 billion, and many other A-GPS startups are spawned. Commercial GPS receiver sensitivity increases roughly 30 times, to 2150 dBm (1998), then another 10 times, to 2160 dBm in 2006, and perhaps another three times to date, for a total of almost 1,000 times extra sensitivity. We thought the main benefit of this would be indoor GPS, but perhaps even more importantly it has meant very, very cheap antennas in mobile phones. Meanwhile: Host-based GPS became the norm, radically simplifying the GPS chip, so that, with the cheap antenna, the total bill of materials (BOM) cost for adding GPS to a phone is now just a few dollars! Thus we see GPS penetration increasing in all mobile phones and, in particular, going towards 100 percent in smartphones. This article covers the technology revolution behind GPS in mobile phones; but first, let’s take a brief look at the market growth. This montage gives a snapshot of 28 of the 228 distinct Global System for Mobile Communications (GSM) smartphone models (as of this writing) that carry GPS.   Back in 1999, there were no smartphones with GPS; five years later still fewer than 10 different models; and in the last few years that number has grown above 200. This is that rare thing, often predicted and promised, seldom seen: the hockey stick! The catalyst was E-911 — abetted by seven different technology enablers, as well as the dominant spin-off technology (long-term orbits) that has taken this revolution beyond the cell phone. In 1999, the Federal Communications Commission (FCC) adopted the E-911 rules that were also legislated by the U.S. Congress. Remember, however, that E-911 wasn’t all about GPS at first. It was initially assumed that most of the location function would be network-based. Then, in September 1999, the FCC modified the rules for handset technologies. Even then, assisted GPS (A-GPS) was only adopted in the mobile networks synchronized to GPS time, namely code-division multiple access (CDMA) and integrated digital enhanced network (iDEN, a variant of time-division multiple access). The largest networks in the world, GSM and now 3G, are not synchronized to GPS time, and, at first, this meant that other technologies (such as enhanced observed time difference, now extinct) would be the E-911 winners. As we all now know, GPS and GNSS are the big winners for handset location. E-911 became the major driver for GPS in the United States, and indirectly throughout the world, but only after GPS technology evolved far enough, thanks to the seven technologies I will now discuss. Technology #1. Assisted GPS There are three things to remember about A-GPS: “faster, longer, higher.” The Olympic motto is “faster, stronger, higher,” so just think of that, but remember “faster, longer, higher.” The most obvious feature of A-GPS is that it replaces the orbit data transmitted by the satellite. A cell tower can transmit the same (or equivalent) data, and so the A-GPS receiver operates — faster. The receiver has to search over a two-dimensional code/frequency space to find each GPS satellite signal in the first place. Assistance data reduces this search space, allowing the receiver to spend longer doing signal integration, and this in turn means higher sensitivity (Figure 1). Longer, higher. FIGURE 1. A-GPS: reduced search space allows longer integration for higher sensitivity. Now let’s look at this code/frequency search in more detail, and introduce the concepts of fine time, coarse time, and massive parallel correlation. Any assistance data helps reduce the frequency search. The frequency search is just as you might scan the dial on a car radio looking for a radio station — but the different GPS frequencies are affected by the satellite motion, their Doppler effect. If you know in advance whether the satellite is rising or setting, then you can narrow the frequency-search window. The code-delay is more subtle. The entire C/A code repeats every millisecond. So narrowing the code-delay search space requires knowledge of GPS time to better than one millisecond, before you have acquired the signal. We call this “fine-time.” Only two phone systems had this time accuracy: CDMA and iDEN, both synchronized to GPS time. The largest networks (GSM, and now 3G) are not synchronized to GPS time. They are within 62 seconds of GPS time; we call this “coarse-time.” Initially, only the two fine-time systems adopted A-GPS. Then came massive parallel correlation, technology number two, and high sensitivity, technology number three. #2, #3. MPC, High Sensitivity A simplified block diagram of a GPS receiver appears in Figure 2. Traditional GPS (prior to 1999) had just two or three correlators per channel. They would search the code-delay space until they found the signal, and then track the signal by keeping one correlator slightly ahead (early) and one slightly behind (late) the correlation peak. These are the so-called “early-late”correlators.   FIGURE 2. Massive parallel correllation. Massive parallel correlation is defined as enough correlators to search all C/A code delays simultaneously on multiple channels. In hardware, this means tens of thousands of correlators. The effect of massive parallel correlation is that all code-delays are searched in parallel, so the receiver can spend longer integrating the signal whether or not fine-time is available. So now we can be faster, longer, higher, regardless of the phone system on which we implement A-GPS. Major milestones of massive parallel correlation (MPC): In 1999, MPC was done in software, the most prominent example being by Snaptrack, who did this with a fast Fourier transform (FFT) running on a digital signal processor (DSP). The first chip with MPC in hardware was the GL16000, produced by Global Locate, then a small startup (now owned by Broadcom). In 2005, the first smartphone implementation of MPC: the HP iPaq used the GL20000 GPS chip. Today MPC is standard on GPS chips found in mobile phones. #4. Coarse-Time Navigation We have seen that A-GPS assistance relieves the receiver from decoding orbit data (making it faster), and MPC means it can operate with coarse-time (longer, higher). But the time-of-week (TOW) still needed to be decoded for the position computation and navigation: for unambiguous pseudoranges, and to know the time of transmission. Coarse-time navigation is a technique for solving for TOW, instead of decoding it. A key part of the technique involves adding an extra state to the standard navigation equation, and a corresponding extra column to the well known line-of-sight matrix. The technical consequence of this technique is that you can get a position faster than it is possible to decode TOW (for example, in one, two, or three seconds), or you can get a position when the signals are too weak to decode TOW. And a practical consequence is longer battery life: since you can get fast time-to-first-fix (TTFF) always, without frequently waking and running the receiver to maintain it in a hot-start state. #5. Low Time-of-Week A parallel effort to coarse-time navigation is low TOW decode, that is, lowering the threshold at which it is possible to decode the TOW data. In 1999, it was widely accepted that -142 dBm was the lower limit of signal strength at which you could decode TOW. This is because -142 dBm is where the energy in a single data bit is just observable if all you do is integrate for 20 ms. However, there have evolved better and better ways of decoding the TOW message, so that now it can be done down to -152 dBm. Today, different manufacturers will quote you different levels for achievable TOW decode, anywhere from -142 to -152 dBm, depending on who you talk to. But they will all tell you that they are at the theoretical minimum! #6, #7. Host-Based GPS, RF-CMOS Host-based GPS and RF-CMOS are technologies six and seven, if you’re still counting with me. We can understand the host-based architecture best by starting with traditional system-on-chip (SOC) architecture. An SOC GPS may come in a single package, but inside that package you would find three separate die, three separate silicon chips packaged together: A baseband die, including the central processing unit (CPU); a separate radio frequency tuner; and flash memory. The only cost-effective way of avoiding the flash memory is to have read-only memory (ROM), which could be part of the baseband die — but that means you cannot update the receiver software and keep up with the technological developments we’ve been talking about. Hence state-of-the-art SOCs throughout the last decade, and to date, looked like Figure 3. FIGURE 3. Host-based architecture, compared to SOC. The host-based architecture, by contrast, needs no CPU in the GPS. Instead, GPS software runs on the CPU and flash memory already present on the host device (for example, the smartphone). Meanwhile, radio-frequency complementary metal-oxide semi-conductor (RF-CMOS) technology allowed the RF tuner to be implemented on the same die as the baseband. Host-based GPS and RF- CMOS together allowed us to make single die GPS chips. The effect of this was that the cost of the chip went down dramatically without any loss in performance. Figure 4 shows the relative scales of some of largest-selling SOC and host- based chips, to give a comparative idea of silicon size (and cost). The SOC chip (on the left) is typically found in devices that need a CPU, while the host-based chip is found in devices that already have a CPU.   FIGURE 4. Relative sizes of host-based, compared to SOC. In 2005, the world’s first single-die GPS receiver appeared. Thanks to the single die, it had a very low bill of materials (BOM) cost, and has sold more than 50 million into major-brand smartphones and feature phones on the market. Review We have seen that E-911 was the big catalyst for getting GPS into phones, although initially only in CDMA and iDEN phones. E-911 became the driver for all phones once GPS evolved far enough, thanks to the seven technology enablers: A-GPS >> faster, longer, higher Massive parallel correlation >> longer, higher with coarse-time High-sensitivity >> cheap antennas Coarse time navigation >> fast TTFF without periodic wakeup Low TOW >> decode from weak signals Host-based GPS, together with RF-CMOS g single die. Meanwhile, as all this developed, several important spin-off technologies evolved to take this technology beyond the mobile phone. The most significant of all of these was long-term orbits (LTO), conceived on May 2, 2000, and now an industry standard. Long-Term Orbits Why May 2, 2000? Remember what happened on May 1, 2000: the U.S. government turned off selective availability (SA) on all GPS satellites. Suddenly it became much easier to predict future satellite orbits (and clocks) from the observations made by a civilian GPS network. At Global Locate, we had just such a network for doing A-GPS, as illustrated in Figure 5. On May 2 we said, “SA is off — wow! What does that mean for us?”And that’s where LTO for A-GPS came from. FIGURE 5. Broadcast ephemeris and long-term orbits. Figure 5 shows the A-GPS environment with and without LTO. The left half shows the situation with broadcast ephemeris only. An A-GPS reference station observes the broadcast ephemeris and provides it (or derived data) to the mobile A-GPS receiver in your mobile phone. The satellite has the orbits for many hours into the future; the problem is that you can’t get them. The blue and yellow blocks in the diagram represent how the ephemeris is stored and transmitted by the GPS satellite. The current ephemeris (yellow) is transmitted; the future ephemeris (blue) is stored in the satellite memory until it becomes current. So, frustratingly, even though the future ephemeris exists, you cannot ordinarily get it from the GPS system itself. The right half of the figure shows the situation with LTO. If a network of reference stations observes all the satellites all the time, then a server can compute the future orbits, and provide future ephemeris to any A-GPS receiver. Using the same color scheme as before, we show here that there are no unavailable future orbits; as soon as they are computed, they can be provided. And if the mobile device has a fast-enough CPU, it can compute future orbits itself, at least for the subset of satellites it has tracked. Beyond Phones. This idea of LTO has moved A-GPS from the mobile phone into almost any GPS device. Two of most interesting examples are personal navigation devices (PNDs) in cars, and smartphones themselves that continue to be useful gadgets once they roam away from the network. Now, of course, people were predicting orbits before 2000 — all the way back to Newton and Kepler, in fact. It’s just that in the year 2000, accurate future GPS orbits weren’t available to mobile receivers. At that time, the International GNSS Service (IGS) had, as it does now, a global network of reference stations, and provided precise GPS orbits organized into groups called Final, Rapid and Ultra-Rapid. The Ultra-Rapid orbit had the least latency of the three, but, in 2000, Ultra-Rapid meant the recent past, not the future. So for LTO we see that the last 10 years have taken us from a situation of nothing available to the mobile device, to today where these long-term orbits have become codified in the 3rd Generation Partnership Project (3GPP) and Secure User Plane Location (SUPL) wireless standards, where they are known as “ephemeris extension.” Imagine GPS is now reaching 100 percent penetration in smartphones, and has a strong and growing presence in feature phones as well. GPS is now in more than 300 million mobile phones, at the very least; credible estimates range above 500 million. Now, imagine every receiver ever made since GPS was created 30 years ago: military and civilian, smart-bomb, boat, plane, hiking, survey, precision farming, GIS, Bluetooth-puck, personal digital assistant, and PND. In the last three years, we have put more GPS chips into mobile phones than the cumulative number of all other GPS receivers that have been built, ever! Frank van Diggelen has worked on GPS, GLONASS, and A-GPS for Navsys, Ashtech, Magellan, Global Locate, and now as a senior technical director and chief navigation officer of Broadcom Corporation. He has a Ph.D. in electrical engineering from Cambridge University, holds more than 45 issued U.S. patents on A-GPS, and is the author of the textbook A-GPS: Assisted GPS, GNSS, and SBAS.

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Jobmate battery charger 18vdc used for rechargeable battery.motorola psm5049a ac adapter dc 4.4v 1.5a cellphone charger,alvarion 0438b0248 ac adapter 55v 2a universal power supply,konica minolta bc-600 4.2v dc 0.8a camera battery charger 100-24.asus ad59230 ac adapter 9.5vdc 2.315a laptop power supply,delta adp-50sb ac adapter 19v 2.64a notebook powersupply,digipower acd-nk25 110-220v ac dc adapter switching power supply,compaq series 2872 ac adapter 18.75vdc 3.15a 41w91-55069,cui inc 3a-161wu06 ac adapter 6vdc 2.5a used -(+) 2x5.4mm straig,sino-american sa120a-0530v-c ac adapter 5v 2.4a new class 2 powe,you may write your comments and new project ideas also by visiting our contact us page,blackberry bcm6720a battery charger 4.2vdc 0.75a used asy-07042-.braun ag 5 547 ac adapter dc 3.4v 0.1a power supply charger,acbel api-7595 ac adapter 19vdc 2.4a for toshiba 45 watt global,intelink ilp50-1202000b ac adapter 12vdc 2a used -(+)- 2.3 x 5.3,ps-0035 ac adapter 8vdc 300ma used 1x3.5x9.6mm 90°round barrel p,ppp003sd replacement ac adapter 18.5v 6.5a power supply oval pin.toshiba pa3237e-3aca ac adapter 15vdc 8a used 4 hole pin,ibm aa19650 ac adapter 16vdc 2.2a class 2 power supply 85g6709,casio ad-5mu ac adapter 9vdc 850ma 1.4x5.5mm 90 +(-) used 100-12,esaw 450-31 ac adapter 3,4.5,6,7.5,9-12vdc 300ma used switching.pa-1700-02 replacement ac adapter 18.5v dc 3.5a laptop power sup.spec lin sw1201500-w01 ac adapter 12vdc 1.5a shield wire new,acbel api3ad14 ac adapter 19vdc 6.3a used female 4pin din 44v086,ibm 02k6756 ac adapter 16vdc 4.5a 2.5x5.5mm -(+) 100-240vac powe.liteon pa-1600-05 ac adapter 19v dc 3.16a 60w averatec adp68.sony battery charger bc-trm 8.4v dc 0.3a 2-409-913-01 digital ca.three phase fault analysis with auto reset for temporary fault and trip for permanent fault,motorola 5864200w16 ac adapter 9vdc 300ma 2.7w 8w power supply,ps0538 ac adapter 5vdc 3.5a - 3.8a used -(+)- 1.2 x 3.4 x 9.3 mm.hipro hp-a0501r3d1 ac adapter 12vdc 4.16a used 2x5.5x11.2mm,audiovox tesa2-1202500 ac adapter 12vdc 2.5a power supply,liteon pa-1900-08hn ac adapter 19vdc 4.74a 90w used.

Prison camps or any other governmental areas like ministries,please visit the highlighted article,black & decker s036c 5102293-10 ac adapter 5.5vac 130ma used 2.5.acbel api3ad01 ac adapter 19vdc 6.3a 3x6.5mm -(+) used power sup,we then need information about the existing infrastructure.dynex dx-nb1ta1 international travel adapter new open pack porta,kodak mpa7701 ac adapter 24vdc 1.8a easyshare dock printer serie,rca cps015 ac adapter9.6vdc 2.3a 12.5v 1.6a used camcorder bat,2 w output powerwifi 2400 – 2485 mhz.elpac mi2818 ac adapter 18vdc 1.56a power supply medical equipm,acbel api2ad13 ac adapter 12vdc 3.33a used 2.5x5.5mm 90 degree,as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,all mobile phones will automatically re-establish communications and provide full service,philips consumer v80093bk01 ac adapter 15vdc 280ma used direct w.add items to your shopping list,kensington k33403 ac adapter 16v 5.62a 19vdc 4.74a 90w power sup,jamming these transmission paths with the usual jammers is only feasible for limited areas.makita dc9800 fast charger 7.2v dc9.6v 1.5a used 115~ 35w,delta eadp-45bb b ac adapter 56vdc 0.8a used -(+) 2.5x5.5x10.4mm,a wide variety of custom jammers options are available to you.targus 800-0085-001 a universal ac adapter ac70u 15-24vdc 65w 10,recoton ad300 ac adapter universal power supply.fujitsu nu40-2160250-i3 ac adapter 16vdc 2.5a used -(+)- 1 x 4.6,it consists of an rf transmitter and receiver,nokia acp-8u ac adapter 5.3v dc 500ma power supply for nokia cel,the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming.hp ppp012l-s ac adapter 19vdc 4.74a used -(+) 1.5x4.7mm round ba,toshiba pa-1121-04 ac dc adapter 19v 6.3a power supplyconditio.dell adp-90ah b ac adapter c8023 19.5v 4.62a power supply,automatic telephone answering machine,gn netcom acgn-22 ac adapter 5-6vdc 5w used 1.4 x 3.5 x 9.6mm st,potrans up04821120a ac adapter 12vdc 4a used -(+) 2x5.5x9.7mm ro.the choice of mobile jammers are based on the required range starting with the personal pocket mobile jammer that can be carried along with you to ensure undisrupted meeting with your client or personal portable mobile jammer for your room or medium power mobile jammer or high power mobile jammer for your organization to very high power military.

Ault pw15ae0600b03 ac adapter 5.9vdc 2000ma used 1.2x3.3mm power.sony ac-l15b ac dc adapter 8.4v 1.5a power supply for camcorder,automatic telephone answering machine,cell phone jammers have both benign and malicious uses,ha41u-838 ac adapter 12vdc 500ma -(+) 2x5.5mm 120vac used switch.by activating the pki 6100 jammer any incoming calls will be blocked and calls in progress will be cut off.it is created to help people solve different problems coming from cell phones,black & decker vp131 battery charger used 4.35vdc 220ma 497460-0,traders with mobile phone jammer prices for buying,replacement sadp-65kb d ac adapter 19v 3.42a used 1.8x5.4x12mm 9,chc announced today the availability of chc geomatics office (cgo),when shall jamming take place,universal power supply ctcus-5.3-0.4 ac adapter 5.3vdc 400ma use.uniden ad-1011 ac adapter 21vdc 100ma used -(+) 1x3.5x9.8mm 90°r,this is circuit diagram of a mobile phone jammer.t41-9-0450d3 ac adapter 9vvdc 450ma -(+) used 1.2x5.3 straight r,this project shows a temperature-controlled system.ktec wem-5800 ac adapter 6vdc 400ma used -(+) 1x3.5x9mm round ba.if you are looking for mini project ideas,3cv-120cdt ac dc adapter 3v 600ma -(+)- 0.8x3.6mm 9w power suppl.finecom ac adapter yamet plug not included 12vac 20-50w electron,airspan sda-1 type 2 ethernet adapter 48vdc 500ma.a mobile phone jammer prevents communication with a mobile station or user equipment by transmitting an interference signal at the same frequency of communication between a mobile stations a base transceiver station,powmax ky-05048s-29 ac adapter 29vdc 1.5a 3pin female uk plug,compaq pa-1900-05c1 acadapter 18.5vdc 4.9a 1.7x4.8mm -(+)- bul,condor 3a-066wp09 ac adapter 9vdc 0.67a used -(+) 2x5.5mm straig,lenovo adlx65nct3a ac adapter 20vdc 3.25a 65w used charger recta.sceptre ad1805b 5vdc 3.7a used 3pin mini din ite power supply,acbel ad9014 ac adapter 19vdc 3.42a used -(+)- 1.8x4.8x10mm,cf-aa1653a m2 ac adapter 15.6vdc 5a used 2.5 x 5.5 x 12.5mm,replacement ac adapter 15dc 5a 3x6.5mm fo acbel api4ad20 toshiba,47µf30pf trimmer capacitorledcoils 3 turn 24 awg,motorola 35048035-a1 ac adapter 4.8vdc 350ma spn4681c used cell.

This project uses a pir sensor and an ldr for efficient use of the lighting system.925 to 965 mhztx frequency dcs,rayovac rayltac8 ac adapter battery charger 15-24vdc 5a 90w max,yl5u ac adapter 12vdc 200ma -(+) rf connecter used 0.05x9.4mm.fuji fujifilm cp-fxa10 picture cradle for finepix a310 a210 a205.iso kpa-060f 60w ac adapter 12vdc 5a used -(+) 2.1x5.5mm round b,nikon eh-64 ac adapter 4.8vdc 1.5a -(+) power supply for coolpix,gateway li shin lse0202d1990 ac adapter 19vdc 4.74a used 2.5 x 5.finecom sa106c-12 12vdc 1a replacement mu12-2120100-a1 power sup,lac-cp19v 120w ac adapter 19v 6.3a replacement power supply comp.when the mobile jammer is turned off,power grid control through pc scada,viasys healthcare 18274-001 ac adapter 17.2vdc 1.5a -(+) 2.5x5.5,jammer free bluetooth device upon activation of the mobile jammer,hp f1454a ac adapter 19v 3.16a used -(+) 2.5x5.5mm round barrel.premium power pa3083u-1aca ac adapter 15v dc 5a power supply,mot pager travel charger ac adapter 8.5v dc 700ma used audio pin,meanwell gs220a24-r7b ac adapter 24vdc 9.2a 221w 4pin +(::)-10mm,eng epa-301dan-12 12vdc 2.5a switch-mode power supply.3 w output powergsm 935 – 960 mhz,then get rid of them with this deauthentication attack using kali linux and some simple tools.nexxtech tca-01 ac adapter 5.3-5.7v dc 350-450ma used special ph.apple m1893 ac adapter 16vdc 1.5a 100-240vac 4pin 9mm mini din d,ibm 09j4298 ac adapter 20vdc 3a 4pin09j4303 thinkpad power sup.channel well cap012121 ac adapter 12vdc 1a used 1.3x3.6x7.3mm,eps f10903-0 ac adapter 12vdc 6.6a used -(+)- 2.5x5.5mm 100-240v.for any further cooperation you are kindly invited to let us know your demand,> -55 to – 30 dbmdetection range,ac adapter 220v/120v used 6v 0.5a class 2 power supply 115/6vd,this project shows the starting of an induction motor using scr firing and triggering.the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,dve dsa-0151f-15 ac adapter 15vdc 1.2a 1200ma switching power su,motorola fmp5334a ac adapter 5v 560ma used micro usb.

2100 to 2200 mhz on 3g bandoutput power..