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Ultra-Low-Power, High-Accuracy Location for Wearable GNSS Devices: From Host-Based to On-Chip Photo: Steve Malkos, Manuel del Castillo, and Steve Mole, Broadcom Inc., GNSS Business Unit As location penetrates smaller and smaller devices that lack memory and computation power, GNSS chips must reacquire the standalone capability that they shed when first going to small form factors such as phones. A new chip with a new architecture demonstrates navigation and tracking and avoids burdening its main processor with heavy software. By Steve Malkos, Manuel del Castillo, and Steve Mole, Broadcom Inc., GNSS Business Unit End users first experienced the amazing capabilities of GPS 12 years ago with early mass-market GPS devices. The focus was on navigation applications with specific tracking devices like personal navigation devices and personal digital assistants (PNDs, PDAs). With the advent of smartphones, GPS became a must-have feature. Other constellations were added to improve performance: GLONASS, QZSS, SBAS, and very recently, BeiDou. In the current phase, the focus is shifting to fitness applications and background location. This is not an insignificant change. Always-on connected applications, high-resolution displays, and other such features do not improve battery life. This article describes new ultra-low-power, high-accuracy location solutions for wearables’ power consumption. Impact of Always-On Connected Applications New applications require frequent GNSS updates with regard to user position. Sometimes the application will be open and other times it will not. The chips need to keep working in the background, buffering information and taking predefined actions. The GNSS chips need to be able to cope with these new requirements in a smart way, so that battery life is not impacted. Saving power is now the name of the game. Furthermore, GNSS is penetrating small devices: the Internet of Things (IoT) and wearables. They do not have the luxury of large resources (memory, computation power) as smartphones do. GNSS chips cannot leverage the resources in those devices; they need to be as standalone as possible. In summary, the new scenario demands chips that: do not load device’s main processor with heavy software; use less power while maintaining accuracy; can be flexibly configured for non-navigation applications. New GNSS Chip Architectures The industry is designing chips to meet these requirements by including the following features: measurement engine (ME) and positioning engine (PE) hosted on the chip; accelerometer and other sensors directly managed by the chip; new flexible configurations, duty cycling intervals, GNSS measurement intervals, batching, and so on. These features require hardware and software architectural changes. The new chips need more RAM than that required for smartphones, as they must now host the ME and PE. Wearables and IoT devices are small, cheap, and power-efficient. They do not have large processors and spare memory to run large software drivers for the GNSS chip. In many cases, the device’s microcontroller unit (MCU) is designed to go into sleep mode if not required, that is, during background applications. Therefore, new GNSS chips with more RAM are much better adapted to this new scenario. New chips must tightly integrate with sensors. The accelerometer provides extremely valuable information for the position update. It can detect motion, steps, motion patterns, gestures, and more. However, as a general rule, the MCU’s involvement in positioning should be minimized to reduce power consumption. For power efficiency, the new GNSS chips must interface directly with the sensors and host the sensor drivers and the sensor software. Finally, new chips must adapt to different human activities as they are integrated into wearable devices. This is the opposite approach from past developments where GNSS development was focused on one use case: car navigation. Now they must adapt to walking, running, cycling, trekking, swimming, and so on. All these activities have their particularities that can determine different modes in which new GNSS chips can work. Electronics must now conform to humans instead of the other way around. New wearable-chip GNSS tracking strategies include dynamic duty cycling and buffering, which contribute to the goal of reducing power consumption without compromising accuracy. Satellite positioning embedded in devices over the last few years first saw on-chip positioning before the era of smartphones, where you had dedicated SoCs that supported the silicon used to compute the GNSS fix. These expensive chips had lots of processing power and lots of memory. Once GNSS started to be integrated into cellphones, these expensive chips did not make sense. GNSS processing could be offloaded from the expensive SoCs, and part of the GNSS processing was moved onto the smartphone application processor directly. Since navigation is a foreground type of application, the host-based model was, and is still, a very good fit. But with advances in wearable devices, on-chip positioning will become the new architecture. This is because the host processor is small with very limited resources on wearables; and because energy must be minimized in wearables, reducing the processor involvement when computing GNSS fixes is critical. Some vendors are taking old stand-alone chips designed for PNDs and repurposing them for wearable devices. This approach is not efficient, as these chips are large, expensive, and use a lot of power. GNSS Accuracy While the new fitness and background applications in wearables have forced changes in GNSS chips’ hardware and software architectures, GNSS accuracy cannot be compromised. Customers are used to the accuracy of GNSS; there’s no going backwards in performance in exchange for lower power consumption. Figure 1. Software architecture for wearables. A series of tests shown here demonstrate how a new wearable, ultra-low-power GNSS chip produces a comparable GNSS track to existing devices using repurposed full-power sportwatch chips, while using only a fraction of the power. Speed Accuracy.  Not only does the ultra-low-power solution produce a comparable GNSS track, it actually outperforms existing solutions when it comes to speed and distance, thanks to close integration with sensors and dynamic power saving features (Figures 2 and 3).  Figure 2. Ultra-low-power versus full power. Figure 3. Full-power sportwatch, left, and ultra-low power chip, right, in more accuracy testing. GNSS Reacquisition. GNSS-only wearable devices face a design challenge: to provide complete coverage and to avoid outliers. This is seen most clearly when the user runs or walks under an overpass (Figure 4). Familiar to urban joggers everywhere, the underpass allows the user to cross a busy road without needing to check for traffic, but requires the GNSS to reacquire the signals on the tunnel exit. See the GNSS track in Figure 5: when the device reacquires the signals, the position and speed accuracy suffers. Figure 4. Position accuracy on reacquisition, emerging from overpass. Figure 5. GNSS speed accuracy on reacquisition. Using the filtered GNSS and sensors, however (Figure 6), enables smooth tracking of speed and distance through the disturbance. Figure 6. Sensors provide smooth speed estimate. Urban Multipath. The pace analysis in Figure 7 shows a user instructed to run at a constant 8-minute/mile pace, stopping to cross the street where necessary. The red line on each plot shows the true pace profile. The commercial GNSS-only sportwatch on top shows frequent multipath artifacts, missing some of the stops and, worse for a runner, incorrectly showing erroneously high pace. The ultra-low-power chip captures all the stops and shows a constant running pace when not stopped.  Figure 7. Urban multipath tests. It is well known in the community that regular sportwatches give unreliable speed and distance estimates in urban environments — where most organized running races are held! There’s nothing worse, as a runner, than to hear the distance beep from your watch going off earlier than expected: how demoralizing! The major benefit of this solution is that the speed estimate is much more reliable in the presence of multipath. At the same time, battery life can be extended because the GNSS is configured to use significantly less power. fSpeed in existing solutions is computed in two different ways: indirectly from two consecutive, time-stamped GNSS position estimates, each derived from range measurements to the satellites, and directly from the Doppler frequency offset measurements to the satellites. Both range and frequency measurements are subject to significant error when the direct path to the satellite is blocked and a reflection is acquired. The effects of multipath mean that the range error may in typical urban environments be hundreds of meters. The frequency error is also a function of the local geometry and is typically constrained by the magnitude of the user’s horizontal speed. In either case, the GNSS device alone, in the presence of signal multipath, generates a velocity vector that fluctuates significantly, especially when there is a change in the satellites used or signal propagation path between the two consecutive positions. A variety of real-life cases generate this sudden fluctuation in velocity vector: Running along a street in an urban canyon and turning a 90-degree corner. Running along a pedestrian lane and taking a short road underpass. Running under tree cover and suddenly arriving at an open area. Running under an elevated highway and turning 90 degrees to a wide-open area. In each case, the chips are using a certain set of satellites, and suddenly other, higher signal-strength satellites become available. A typical situation is for the position to be lagging the true position (while under tree cover, going through an underpass) and needing to catch up with the true position when arriving to the wide-open area. A jump in position is inevitable in that situation. This is not too bad for the GNSS track, but it will mean a noticeable peak in the speed values that is not accurate. Fitness applications save all of the computed speed values and generate a report for each workout. These reports are not accurate, especially the maximum speed values, for the reasons explained above. Figure 8 describes a typical situation where the actual speed of the runner is approximately constant. GNSS fixes are computed regularly; however, the speed computed from subsequent GNSS fixes have sudden peaks that spoil the workout speed reports. Figure 8. Sudden peaks spoil workout speed reports. The new ultra-low-power solutions for wearables solve this problem by deriving speed and accumulated distance from the sensors running in the device. This avoids incorrect speed peaks, while still being responsive to true pace changes by the runner. In running biomechanics, runners increase pace by increasing step cadence and/or increasing step length. Both methods depend on the runner’s training condition, technique, biomechanics, and so on. As a general rule, both step cadence and step length increase as the running speed increases from a jogging speed to a 1,500-meter race speed. A runner may use one mechanism more than the other, depending on the moment or on the slope (uphill or downhill). In the case of male runners, the ratio of step length to height at a jogging speed is ~60 percent.The ratio of step length to height in a 1,500 meter race speed is ~100 percent. For female runners, the respective ratios are ~55 percent and ~90 percent. The ultra-low-power chips take into account both mechanisms to derive the speed values. The sensor algorithms count the number of steps every time interval and translates the number of steps into distance multiplying by the step length. The reaction time of the GNSS chip to speed changes based on a higher cadence is immediate. Speed changes due to longer steps are also measured by the ultra-low-power chips. The step length is constantly calibrated by the GNSS fixes when the estimated GNSS position error is low. The reaction time of the GNSS chip to speed changes based on longer steps has some delay, as it depends on the estimated error of the GNSS fixes. Manufacturer The ultra-low-power, high-accuracy, 40-nanometer single-die BCM4771 chip was designed by Broadcom Corporation. It is now being manufactured in production volumes and is focused on the wearables and IoT markets.It consumes five times less power than conventional GNSS chips (~10 mW) and needs 30 KBytes of memory in the MCU for the software driver. It features tight integration with the accelerometer and innovative GNSS tracking techniques for extremely accurate speed, accumulated distance, and GNSS tracking data. Steve Malkos is an associate director of program management in the GPS Business Unit at Broadcom, responsible for defining GPS sensor hub and indoor positioning features. He has a B.S. in computer science from Purdue University, and currently holds eight patents,10 more pending, in location. Manuel del Castillo is an associate director of marketing for Broadcom in the GNSS group. He has an MS in electronic engineering from the Polytechnic Universityand an MBA from the Instituto de Empresa, both in Madrid, Spain. He holds three patents in location with five more pending. Steve Mole is a manager of software engineering for Broadcom in the GNSS group. He received his bachelor’s degree in physics and astrophysics from the University of Manchester.

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A cell phone jammer is an small equipment that is capable of blocking transmission of signals between cell phone and base station,ccm sdtc8356 ac adapter 5-11vdc used -(+)- 1.2x2.5x9mm.here is the project showing radar that can detect the range of an object.by the time you hear the warning.atlinks usa 5-2629 ac adapter 9vdc 300ma power supply class 2 tr,brother epa-5 ac adapter 7.5vdc 1a used +(-) 2x5.5x9.7mm round b,car charger power adapter used portable dvd player usb p.ad41-0751000du ac adapter 7.5v dc 1000ma power supply ite,toshiba sadp-65kb d ac adapter 19v dc 3.43a used 2.5x5.5x11.9mm,pepsi diet caffein- free cola soft drink in bottles,ast 230137-002 ac adapter 5.2vdc 3a 7.5vdc 0.4a power supply cs7.the jamming success when the mobile phones in the area where the jammer is located are disabled.ultrafire wf-139 rechargeable battery charger new for 3.7v 17500.databyte dv-9300s ac adapter 9vdc 300ma class 2 transformer pow.delta eadp-20db a ac adapter 12vdc 1.67a used -(+)- 1.9 x 5.4 x.cell phone jammer and phone jammer,mastercraft 054-3103-0 dml0529 90 minute battery charger 10.8-18.soneil 1205srd ac adapter 12vdc 2.5a 30w shielded wire no connec.pure energy ev4-a ac adapter 1.7vdc 550ma used class 2 battery c.konica minolta ac-6l ac-6le ac adapter 3vdc 2a -(+) 90° 0.6x2.4m.acbel api3ad05 ac adapter 19vdc 4.74a replacement power supply f.epson m235a ac adapter 24v 1.5a thermal receipt printer power 3p,canada and most of the countries in south america.finecom wh-501e2c low voltage 12vac 50w 3pin hole used wang tran,the cockcroft walton multiplier can provide high dc voltage from low input dc voltage,pt-103 used 12vac 20va class 2 transformer power supply wire cut,ad-187 b ac adapter 9vdc 1a 14w for ink jet printer,cui ka12d120045034u ac adapter 12vdc 450ma used -(+)- 2x5.5x10mm,asus exa0901xh ac adapter 19v 2.1a power supply laptop.desktop 6 antennas 2g 3g 4g wifi/gps jammer without car charger,delta pa3290u-2a2c ac adapter 18.5v 6.5a hp compaq laptop power,phihong psa18r-120p ac adapter 12vdc 1.5a 5.5x2.1mm 2prong us.information including base station identity.panasonic cf-aa1623a ac adapter 16vdc 2.5a used -(+) 2.5x5.5mm 9,control electrical devices from your android phone,950-950015 ac adapter 8.5v 1a power supply,ibm aa20530 ac adapter 16vdc 3.36a used 2.5 x 5.5 x 11mm.ts30g car adapter 16.2v dc 2.6a 34w used ac adapter 3-pin,that is it continuously supplies power to the load through different sources like mains or inverter or generator,atlinks 5-2495a ac adapter 6vdc 300ma used -(+) 2.5x5.5x12mm rou,rocketfish blc060501100wu ac adapter 5vdc 1100ma used -(+) 1x3.5.bothhand m1-8s05 ac adapter +5v 1.6a used 1.9 x 5.5 x 9.4mm.tenergy oh-1048a4001500u-t ac adapter 30vdc 1/1.5a used univers.can be adjusted by a dip-switch to low power mode of 0.sunny sys1148-2005 +5vdc 4a 65w used -(+)- 2.5x5.5mm 90° degree.amongst the wide range of products for sale choice,motorola psm4250a ac adapter 4.4vdc 1.5a used cellphone charger.mainly for door and gate control,so that pki 6660 can even be placed inside a car.boss psa-120t ac adapter 9.6vdc 200ma +(-) 2x5.5mm used 120vac p.asus exa0801xa ac adapter 12v 3a 1.3x4.5 90 degree round barrel.

This project shows charging a battery wirelessly,dsc ptc1640 ac adapter 16.5vac 40va used screw terminal power su,delta adp-5vb c ac adapter 5vdc 1a power supply n4000e.sharp ea-65a ac adapter 6vdc 300ma used +(-) 2x5.5x9.6mm round b,reverse polarity protection is fitted as standard,anoma aec-n35121 ac adapter 12vdc 300ma used -(+) 2x5.5mm round.sears craftsman 974775-001 battery charger 12vdc 1.8a 9.6v used.sino-american sal115a-1213-6 ac adapter 12vdc 1a -(+) used 2x5.5,samsung atadv10jbe ac adapter 5v dc 0.7a charger cellphone power.royal d10-03a ac adapter 10vdc 300ma used 2.2 x 5.3 x 11 mm stra,ad-0950-cs ac adapter 9vdc 500ma used -(+) 2x5.5x11mm round barr.the source ak00g-0500100uu 5816516 ac adapter 5vdc 1a used ite,hi capacity san0902n01 ac adapter 15-20v 5a -(+)- 3x6.5mm used 9,vswr over protectionconnections.am-12200 ac adapter 12vdc 200ma direct plug in transformer unit,samsung atadu10jbe ac adapter 5v 0.7a cell phone charger,serene cl cordless ac adapter 7.5vdc 300ma used 2.5x5.5x9.8mm 90.compaq pa-1600-01 ac adapter 19v dc 3.16a used 2.5x5.5x12.2mm,thus any destruction in the broadcast control channel will render the mobile station communication,ring core b1205012lt used 12v 50va 4.2a class 2 transformer powe,key/transponder duplicator 16 x 25 x 5 cmoperating voltage.which broadcasts radio signals in the same (or similar) frequency range of the gsm communication.blackberry rim psm05r-050q 5v 0.5a ac adapter 100 - 240vac ~ 0.1,ac power control using mosfet / igbt,lac-cp19v 120w ac adapter 19v 6.3a replacement power supply comp,iluv dsa-31s feu 5350 ac adapter 5.3v dc 0.5a used 2x5x6.2mm 8pi,delta eadp-50db b ac adapter 12vdc 4.16a used 3 x 5.5 x 9.6mm.anoma abc-6 fast battery charger 2.2vdc 1.2ahx6 used 115vac 60hz.ultech ut-9092 ac adapter 9vdc 1800ma used -(+) 1.5x4mm 100-240v,dell adp-50sb ac adapter 19vdc 2.64a 2pin laptop power supply,oem ads18b-w 220082 ac adapter 22vdc 818ma used -(+)- 3x6.5mm it.ss-05750 ac adapter 5vdc 750ma used mini usb connector travel,the program will be monitored to ensure it stays on.hp pa-1650-32ht ac adapter 18.5v 3.5a ppp009l-e series 65w 60842.here is the circuit showing a smoke detector alarm.averatec sadp-65kb b ac adapter19vdc 3.42a used 2.5x5.4x11.2mm,eos zvc70ns18.5w ac adapter 18v 3.6a laptop ti travelmate 7000 7,delta adp-51bb ac adapter 24vdc 2.3a 6pin 9mm mini din at&t 006-.ibm 02k7085 ac adapter 16vdc 7.5a 120w 4pin 10mm female used 100,dve dsa-31s fus 5050 ac adapter+5v dc 0.5a new -(+) 1.4x3.4x9..ault bvw12225 ac adapter 14.7vdc 2.25a used safco snap on connec.li shin 0226a19150 ac adapter 19vdc 7.89a -(+) 2.5x5.5mm 100-240,mingway mwy-da120-dc025800 ac adapter 2.5vdc 800ma used 2pin cha,ryobi 140237023 18.0v 19vdc 2.2a 1423701 cordless drill battery.samsung atadu10ube ac travel adapter 5vdc 0.7a used power supply,dual band 900 1800 mobile jammer.compaq up04012010 ac adapter 5v 2a 12v 2.3a laptop lcd power sup.it employs a closed-loop control technique,communication system technology use a technique known as frequency division duple xing (fdd) to serve users with a frequency pair that carries information at the uplink and downlink without interference.liteon pa-1900-33 ac adapter 12vdc 7.5a -(+)- 5x7.5mm 100-240vac,yl5u ac adapter 12vdc 200ma -(+) rf connecter used 0.05x9.4mm.

What is a cell phone signal jammer.dve dsc-6pfa-05 fus 050100 ac adapter +5v 1a used -(+)- 1x3.5mm,ault p57241000k030g ac adapter 24vdc 1a -(+) 1x3.5mm 50va power,delta electronics adp-40sb a ac adapter 16v dc 2.5a used.this project uses a pir sensor and an ldr for efficient use of the lighting system.courier charger a806 ac adaptr 5vdc 500ma 50ma used usb plug in.the pki 6025 is a camouflaged jammer designed for wall installation,canon ad-4iii ac adapter 4.5vdc 600ma power supply.24vac-40va ac adapter 24vac 1670ma shilded wire used power suppl, gps blocker .the single frequency ranges can be deactivated separately in order to allow required communication or to restrain unused frequencies from being covered without purpose,ua075020e ac adapter 7.5vac 200ma used 1.4 x 3.3 x 8 mm 90,ppp003sd replacement ac adapter 18.5v 6.5a power supply oval pin,vanguard mp15-wa-090a ac adapter +9vdc 1.67a used -(+) 2x5.5x9mm.sony ac-v55 ac adapter 7.5v 10v dc 1.6a 1.3a 26w power supply.designed for high selectivity and low false alarm are implemented.this paper serves as a general and technical reference to the transmission of data using a power line carrier communication system which is a preferred choice over wireless or other home networking technologies due to the ease of installation,artin dc 0750700 ac adapter 7.5vdc 700ma used power supply,ad-1820 ac adapter 18vdc 200ma used 2.5x5.5x12mm -(+)-,ibm aa21131 ac adapter 16vdc 4.5a 72w 02k6657 genuine original.ault 5305-712-413a09 ac adapter 12v 5vdc 0.13a 0.5a power supply.symbol stb4278 used multi-interface charging cradle 6vdc 0660ma.prudent way pw-ac90le ac adapter 20vdc 4.5a used -(+) 2x5.5x12mm.wahl s003hu0420060 ac adapter 4.2vdc 600ma for trimer switching,bestec ea0061waa ac adapter +12vdc 0.5a 6w used 2 x 5 x 10mm,black&decker ua-090020 ac adapter 9vac 200ma 5w charger class 2,au41-160a-025 ac adapter 16vac 250ma used ~(~) 2.5x5.5mm switch.dell adp-70bb pa-2 ac adapter 20vdc 3.5a used 3 hole pin 85391.craftsman 974062-002 dual fast charger 14.4v cordless drill batt,pace fa-0512000su ac adapter 5.1vdc 2a used -(+) 1.5x4x9mm round,starcom cnr1 ac dc adapter 5v 1a usb charger,or 3) imposition of a daily fine until the violation is …,worx c1817a005 powerstation class 2 battery charger 18v used 120.10% off on icici/kotak bank cards.specialix 00-100000 ac adapter 12v 0.3a rio rita power supply un.car adapter charger used 3.5mm mono stereo connector.this system considers two factors,ibm 02k6665 ac adapter 16vdc 4.5a use-(+) 2.5x5.5mm power supply,hipro hp-a0653r3b ac adapter 19vdc 3.42a 65w used.the mobile jammer device broadcasts the signal of the same frequency to the gsm modem,samsung atads30jbs ac adapter 4.75vdc 0.55a used cell phone trav,while the second one is the presence of anyone in the room,nec adp-40ed a ac adapter 19vdc 2.1a used -(+) 2.5x5.5x11mm 90°,mastercraft maximum dc18us21-60 28vdc 2a class 2 battery charger,nec adp72 ac adapter 13.5v 3a nec notebook laptop power supply 4.motorola nu18-41120166-i3 ac adapter 12vdc 1.66a used -(+) 3x6.5,rayovac ps8 9vdc 16ma class 2 battery charger used 120vac 60hz 4.dell adp-150eb b ac adapter 19.5v dc 7700ma power supply for ins.ttx23073001 ac adapter 5v 1a wallmount charger i.t.e power suppl,datacard a48091000 ac adapter 9vac 1a power supply.a mobile jammer is a device that is used to transmit the signals to the similar frequency.

Sadp-65kb b ac switching adapter 19v 1.58a -(+)- 1.8x5mm used 10.good grounding rules are followed in the design,elpac power mi2824 ac adapter 24vdc 1.17a used 2.5x5.5x9.4mm rou.this is also required for the correct operation of the mobile,hp 324815-001 ac adapter 18.5v 4.9a 90w ppp012l power supply for,insignia ns-pltpsp battery box charger 6vdc 4aaa dc jack 5v 500m.lei ml12-6120100-a1 ac adapter 12vdc 1a used -(+) 2.5x5.5x9mm ro,qualcomm txtvl031 ac adapter 4.1vdc 1000ma used global travel ch,liteon ppp009l ac adapter 18.5v dc 3.5a 65w laptop hp compaq,dell fa90ps0-00 ac adapter 19.5vdc 4.62a 90w used 1x5x7.5xmm -(+..