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LocataLite installation showing Jps transceiver tower. Locata Fills Satellite Availability Holes in Obstructed Environments By Chris Rizos, Nunzio Gambale, and  Brendon Lilly An integrated GNSS+Locata system installed on drills, shovels, and bulldozers — the full complement of high-precision machines on site — at Australia’s Newmont Boddington Gold Mine has increased positioning accuracy and availability, as well as mine operational efficiencies, demonstrating an improvement in availability over GNSS-only of 75.3 to 98.7 percent. Many of the new paradigms in mining have at their core the requirement for reliable, continuous centimeter-level positioning accuracy to enable increased automation of mining operations. The deployment of precision systems for navigating, controlling, and monitoring machinery such as drills, bulldozers, draglines, and shovels with real-time position information increases operational efficiency, and the automation reduces the need for workers to be exposed to hazardous conditions. GPS singly, and GNSS collectively, despite their accuracy and versatility, cannot satisfy the stringent requirements for many applications in mine surveying, and mine machine guidance and control. Increasingly, open-cut mines are getting deeper, reducing the sky-view angle necessary for GNSS to operate satisfactorily. A new terrestrial high-accuracy positioning system can augment GNSS with additional terrestrial signals to enable centimeter-level accuracy, even when there are insufficient GNSS (GPS+GLONASS) satellite signals in view for reliable positioning and navigation. Locata relies on a network of synchronized ground-based transceivers that transmit positioning signals that can be tracked by suitably equipped user receivers. In September 2012, Leica Geosystems launched the first commercial product integrating GNSS and Locata capabilities into a single high-accuracy and high-availability positioning device for open-cut mine machine automation applications: Leica Jigsaw Positioning System (Jps) – Powered by Locata. This article describes technical aspects of this technology and presents positioning results of actual mine operations. In the near future — perhaps by 2020 — the number of GNSS and augmentation system satellites useful for high-accuracy positioning will increase to almost 150, with perhaps six times the number of broadcast signals on which carrier phase and pseudorange measurements can be made. However, the most severe limitation of GNSS performance will still remain: the accuracy of positioning deteriorates very rapidly when the user receiver loses direct view of the satellites. This typically occurs in deep open-cut mines as well as in skyscraper-dominated urban canyons. Locata’s positioning technology solution provides an option either to augment GNSS with extra terrestrial signals, or to replace GNSS entirely. Locata relies on a network of synchronized ground-based transceivers (LocataLites) that transmit positioning signals that can be tracked by suitably equipped user receivers. These transceivers form a network (LocataNet) that can operate in combination with GNSS, or entirely independent of GNSS. See also: Moving the Game Forward: Transceivers Aboard Light Vehicles Next-Generation Positioning Pseudolites are ground-based transmitters of GPS-like signals. Most pseudolites developed to date transmit signals at the GPS frequency bands. Both pseudorange and carrier-phase measurements can be made on the pseudolite signals. The use of pseudolites can be traced back to the early stages of GPS development in the late 1970s, when they were used to validate the GPS concept before launch of the first GPS satellites. In 1997, Locata Corporation began developing a technology to provide an alternate local GPS signal capability that would overcome many of the limitations of pseudolite-based positioning systems by using a time-synchronized transceiver. The LocataLite transmits GPS-like positioning signals but also can receive, track, and process signals from other LocataLites. A network of LocataLites forms a LocataNet, and the first-generation system transmitted signals using the same L1 frequency as GPS. Time-synchronized signals allow carrier-phase single-point positioning with centimeter-level accuracy for a mobile unit. In effect, the LocataNet is a new constellation of signals, with some unique features such as having no base station data requirement, requiring no wireless data link from reference station to mobile receiver, and no requirement for measurement double-differencing. Improvements dating from 2005 use a proprietary signal transmission structure that operates in the license-free Industry Scientific and Medical (ISM) band (2.4–2.4835GHz), known globally as the Wi-Fi band. Within this ISM band, the LocataLite design allows for the transmission of two frequencies, each modulated with two spatially-diverse PRN codes. From the beginning the driver for the Locata technology was to develop a centimeter-level accuracy positioning system that could complement, or replace, conventional RTK-GNSS in environments such as open-cut mines, deep valleys, heavily forested areas, urban and even indoor locations, where obstruction of satellite-based signals occurs. Leica Geosystems has been testing Locata in the Newmont Boddington Gold Mine (NBG) in Western Australia for several years. In 2006, NBG started installing Leica Geosystems high-precision GPS-based guidance systems for fleet management. The mine operators determined early on that as the pit grew deeper, they would need an alternative positioning system for these guidance systems to continue working for the life of the mine. In March 2012, Leica Geosystems deployed a world-first production version of its Jigsaw Positioning system, integrating GNSS+Locata, at the NBG mine. Expected to become Australia’s largest gold producer, the mine consists of two pits (Figure 1). The North Pit at NBG is currently about 1 kilometer long, 600 meters wide, and now approaching 275 meters deep. Figure 1. Location of 12 LocataLites at NBG Mine. Figure 2. The Newmont Boddington pit, 900 feet deep and going deeper all the time, creates difficulties for GNSS equipment positioning the mine’s heavy machinery. A single LocataNet consisting of 12 LocataLites was deployed during April and May 2012 in an initial installation designed to cover both pits in the mine. The results presented here are taken from tests in the North Pit. Leica’s version of the LocataLite is solar-powered and designed to be placed in the best locations to achieve the maximum benefit. As no special consideration for the location of a transmitter base station is required, the LocataLites can be placed in areas on the rim of the pit or just above the machines operating in the pit floor. The only set-up requirement is that they are able to see at least one other LocataLite to synchronize their transmissions to around 1 nanosecond or better throughout the mine. Each Jps transmit tower has four small patch antennas mounted in an array. The uppermost is a GNSS antenna used to self-survey the top of the tower, and hence derive the positions of the other antennas below it on the tower. The Locata transmit 1 antenna is mounted directly under the GNSS antenna. The Locata receive antenna is directly under that, and the Locata transmit 2 antenna is around two meters lower down on the tower. All the antennas are separated by a known distance, and the LocataLite transmit antennas can be tilted down into the pit to maximize the signal broadcast into the area. Each LocataLite transmits four independent positioning signals, two signals from each transmit antenna. These signals provide a level of redundancy and greatly assist in the mitigation of multipath problems in the pit, thereby contributing to the robustness and reliability of the positioning solution. Jps receivers were first installed on two production drill rigs in April 2012. Installation on drills was the highest priority because they are the machines at NBG that operate closest to pit walls and other obstructions, and therefore stood to benefit most from having more reliable positioning. Each Jps receiver incorporates two GNSS and two Locata receivers (Figure 3). One GNSS and Locata receiver pair is connected to a co-located antenna on one side of the machine and the other GNSS and Locata receiver pair is connected to the other co-located antenna. The GNSS receivers obtain their RTK corrections from an RTK base station. The Locata receivers do not require any corrections. The system uses the NMEA outputs from both pairs of receivers to determine the position and heading of the drill rig for navigation purposes. Figure 3. Jps receiver with integrated GNSS and Locata receivers and two receiver antennas. The goal of the Jps receiver is to improve the availability of high-accuracy RTK positions with fixed carrier phase integer ambiguities. The results presented here are therefore divided into three sections: Improvements in availability over a two-month period for all the data in the North Pit. Improvements in availability for an area in the pit where the GNSS savings are expressed in dollar terms. Accuracy results achieved and maintained in this GNSS-degraded area. The performance results shown here are real-world samples of the system operating on drills at NBG. However, it will be appreciated that GNSS satellites are in constant motion, so GNSS-only position availability in different parts of the pit changes by the hour. The results therefore only apply to those drills in those positions in the pit at that time. Another drill a little distance away in the same pit could experience far better or far worse GNSS availability at exactly the same time. Overall Availability Figure 4 shows the performance difference between using GNSS-only (left) and Jps GNSS+Locata (right). The data for these plots was recorded for the two drills that contained the Jps receiver in the North Pit during the months of April and May 2012. A green dot represents the time the receiver had a RTK fixed solution, and a red dot represents all other lower-quality position solutions — essentially when the receiver was unable to achieve the required RTK accuracy because of insufficient GNSS signals or geometry. Figure 4. Plots of availability and position quality in the North Pit at NBG for April and May 2012 for GNSS (left) and Jps (right). Green = RTK (fixed) solution, Red = all lesser quality solutions. Although the availability of GNSS-only RTK fixed position solutions was reasonably good over this entire area, being at the 92.3 percent level at that time, the Jps nevertheless provided a measurable improvement of 6.5 percent to availability, bringing it up to 98.8 percent. Considering that during those two months, the two drills spent a total of 72.24 operational days in the North Pit, this improvement equates to nearly 4.7 days or 112.7 hours of additional guidance availability. Figure 5 highlights the low positional quality for the GNSS-only solutions and how Jps significantly improved the availability in areas of limited GNSS satellite visibility. Figure 5. Plots showing non-RTK quality positions, demonstrating that Jps can help reduce lesser-quality RTK solutions. (Performance in the circled area is highlighted in more detail in Figure 6.) Availability in Poor GNSS Visibility The ellipse in Figure 5 highlights a particular location in the North Pit where GNSS positioning consistently struggles due to the presence of the northern wall and to a lesser extent from the eastern wall. The integration of GNSS and Locata signals improved availability as shown in Figure 6, which in this case increased by 23.4 percent. Figure 6. Zoomed-in area where GNSS performance was poor between May 2 and May 4, 2012. The circled area shows where the accuracy tests were performed. As the machine downtime due to not having a RTK position costs the mine approximately U.S. $1000 per hour for each drill, the improvement in availability of 112.7 hours for just the two drills shown in Figure 5 over the two months equates to a savings of $112,700 in operational costs. This productivity increase is significant, considering that the GNSS-only availability in this case still seems relatively good at 92.3 percent. If the GNSS availability for those two months was more like 75 percent — as was the case shown in Figure 6 for the two days in May — then the cost savings become far greater, approaching nearly $400,000, for just two drills over two months. Even a small increase in productivity brings a significant financial benefit ($110,000 per hour) when all 11 drill rigs running in the mine are affected by loss of GNSS positioining availability, yet continue to operate with Jps. Today all 11 drills in the pits have been fitted with the Jps GNSS+Locata Receivers. As a point of reference to emphasize the level of operational savings: if the Jps had been fitted to all 11 drills during the April and May 2012 period shown in the above results, the cost savings at that time would have been on the order of $1,000,000. It is clear that the savings in production costs that can be gained from improving the availability to the fleet guidance system has a significant impact on the return-on-investment, potentially covering the installation costs within months of deployment. It should also be emphasized that as the pits get deeper, GNSS availability will only degrade further, and the evident production and dollar benefits of the integrated GNSS+Locata system become even larger. Relative Accuracy The above levels of improvement in availability are of no benefit if the position accuracy is not maintained within acceptable limits. In order to compare the relative accuracy between the two systems, a dataset was taken from the same data above (circle in Figure 6) when the machine was stationary. The average position difference between the GNSS-only and Jps receivers for the hour-long dataset was 1.2 centimeters horizontally and 2.7 cm in the vertical component (Table 1). The spread of the position solutions for the two receivers were comparable in the horizontal, with Jps providing a slightly better horizontal RMS value due to the extra Locata signals being tracked and the stronger overall geometry. Additionally, Jps showed a better RMS in the vertical compared to GNSS-only. Table 1. Comparison of relative accuracy and RMS between the GNSS-only and GNSS+Locata solutions. Figure 7a shows the spread of horizontal positions for the Jps receiver, where 0,0 is the mean horizontal position during this time. Note that all the positions are grouped within +/-2 cm of the mean without any outliers. Figure 7b shows the corresponding spread in the vertical positions. These are well within the acceptable accuracy limits required by the machine guidance systems used at the mine. Figure 7A. Scatter plot of the positions from the Jps receiver over a period of over an hour. Figure 7B. Vertical error for same sample set as Figure 7a. Concluding Remarks Based on the experiences at Newmont Boddington Gold, use of Jps has improved the operational availability of open-pit drilling machines by at least 6.5 percent by reducing the outages in 3D positioning caused by poor GNSS satellite visibility commonly associated with deep pits. When Jps is subjected to much harsher conditions closer to high walls, the Jps continues to perform and the improvement in availability compared to GNSS-only is more significant while still maintaining RTK-GNSS levels of accuracy. The additional availability achieved translates directly into cost savings in production for the mine. Acknowledgments The first author acknowledges the support on the Australian Research Council grants that have supported research into pseudolites and Locata: LP0347427 “An Augmented-GPS Software Receiver for Indoor/Outdoor Positioning,” LP0560910 “Network Design & Management of a Pseudolite and GPS Based Ubiquitous Positioning System,” LP0668907 “Structural Deformation Monitoring Integrating a New Wireless Positioning Technology with GPS,” DP0773929 “A Combined Inertial, Satellite & Terrestrial Signal Navigation Device for High Accuracy Positioning & Orientation of Underground Imaging Systems.” The authors also thank the many people that have contributed to the development of the Leica Jps product. The Leica Geosystems Machine Control Core and CAL teams in Brisbane and Switzerland, other Hexagon companies such as Antcom Corporation and NovAtel, the Locata team in Canberra and the United States, and the people at Newmont Boddington Gold that have gone out of their way to make this a success. Chris Rizos is a professor of geodesy and navigation at the University of New South Wales; president of the International Association of Geodesy; a member of the Executive and Governing Board of the International GNSS Service (IGS), and co-chair of the Multi-GNSS Asia Steering Committee. Nunzio Gambale is co-founder and CEO of Locata Corporation, and represents the team of engineers who invented and developed Locata. Brendon Lilly is the product manager for the Leica Jps product at Leica Geosystems Mining and has worked for more than 20 years in both software and hardware product development. He has a Ph.D. from Griffith University.

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Ibm 73p4502 ac adapter 16vdc 0 - 4.55a 72w laptop power supply,hp compaq ppp009l ac adapter 18.5vdc 3.5a used -(+) with pin ins,thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably.qualcomm cxdtc051 ac adapter 8.4dc 1025ma ac power supply,it consists of an rf transmitter and receiver.wii das705 dual charging station and nunchuck holder,yhsafc0502000w1us ac adapter 5vdc 2a used -(+) 1.5x4x9mm round b,sony cechza1 ac adapter 5vdc 500ma used ite power supply 100-240,cwt paa050f ac adapter 12vdc 4.16a used 2.5x5.5mm -(+) 100-240va,using this circuit one can switch on or off the device by simply touching the sensor.atlinks 5-2625 ac adapter 9vdc 500ma power supply.bothhand m1-8s05 ac adapter +5v 1.6a used 1.9 x 5.5 x 9.4mm.delta electronics adp-36db rev.a ac power adapter ast laptop,this project shows the control of home appliances using dtmf technology.atlinks 5-2521 ac adapter 12vdc 450ma used 2 x 5.5 x 10mm,gateway2000 adp-45cb ac dc adapter 19v 2.4a power supply,plantronics ssa-5w-05 0us 050018f ac adapter 5vdc 180ma used usb.this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure,dve dsa-0131f-12 us 12 ac adapter 12vdc 1a 2.1mm center positive,propower pc-7280 battery charger 2.2vdc 1.2ahx6 used 115vac 60hz,optionally it can be supplied with a socket for an external antenna,phihong psc30u-120 ac adapter 12vdc 2.5a extern hdd lcd monitor,altec lansing acs340 ac adapter 13vac 4a used 3pin 10mm mini din,panasonic bq-345a ni-mh battery charger 2.8v 320ma 140max2.our men’s and boy’s competition jammers are ideal for both competitive and recreational swimming.motorola 35048035-a1 ac adapter 4.8vdc 350ma spn4681c used cell.polaroid k-a70502000u ac adapter 5vdc 2000ma used (+) 1x3.5x9mm,bti veg90a-190a universal ac adapter 15-20v 5.33a 90w laptop pow,fone gear 01023 ac adapter 5vdc 400ma used 1.1 x 2.5 x 9mm strai,duracell mallory bc734 battery charger 5.8vdc 18ma used plug in,sanyo scp-01adtac adapter 5.5v 950ma travel charger for sanyo,poweruon 160023 ac adapter 19vdc 12.2a used 5x7.5x9mm round barr,power amplifier and antenna connectors.bionx sa190b-24u ac adapter 26vdc 3.45a -(+)- 89.7w charger ite.nalin nld200120t1 ac adapter 12vdc 2a used -(+) 2x5.5mm round ba.motorola 481609oo3nt ac adapter 16vdc 900ma used 2.4x5.3x9.7mm,eng 3a-231a15 ac adapter 15vdc 1.5a used -(+) 1.7 x 4.8 x 9.5 mm,ss-05750 ac adapter 5vdc 750ma used mini usb connector travel,dell la65ns2-00 65w ac adapter 19.5v 3.34a pa-1650-02dw laptop l,canon ad-4iii ac adapter 4.5vdc 600ma power supply.with a single frequency switch button,our pharmacy app lets you refill prescriptions,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,pantech pta-5070dus ac dc adapter 5v 700ma cellphone battery cha,neonpro sps-60-12-c 60w 12vdc 5a 60ew ul led power supply hyrite,hi capacity ea1050a-190 ac adapter 19vdc 3.16a used 5 x 6 x 11,power-win pw-062a2-1y12a ac adapter 12vdc 5.17a 62w 4pin power,healthometer 4676 ac adapter 6vdc 260ma used 2.5x5.5mm -(+) 120v,ault cs240pwrsup ac adapter 7.5vdc 260ma used 9.0vac 250ma,audf-20090-1601 ac adapter 9vdc 1500ma -(+) 2.5x5.5mm 120vac pow.hp 384021-001 compaq ac adapter 19vdc 4.7a laptop power supply,netbit dsc-51fl 52100 ac adapter 5v 1a switching power supply.atlinks 5-2520 12v ac adapter 450ma 11w class 2 power supply.with the antenna placed on top of the car,bec ve20-120 1p ac adapter 12vdc 1.66a used 2x5.5mm -(+) power s.liteon pa-1460-19ac ac adapter 19vdc 2.4a power supply,65w-dlj104 ac adapter 19.5v dc 3.34a dell laptop power supply,condor wp05120i ac adapter 12v dc 500ma power supply.ad41-0751000du ac adapter 7.5v dc 1000ma power supply ite,aironet ad1280-7-544 ac adapter 12vdc 800ma power supply for med,thomson 5-2752 telephone recharge cradle with 7.5v 150ma adapter.tpi tsa1-050120wa5 ac dc adapter 5v 1.2a charger class 2 power s,sharp s441-6a ac adapter 12vdc 400ma used +(-) 2x5.5x13mm 90° ro,cnet ad1605c ac adapter dc 5vdc 2.6a -(+)- 1x3.4mm 100-240vac us.acbel api4ad20 ac adapter 15v dc 5a switching power supply adapt.delta iadp-10sb hp ipaq ac adapter 5vdc 2a digital camera pda,to cover all radio frequencies for remote-controlled car locksoutput antenna,armaco a274 ac dc adapter 24v 200ma 10w power supply.chd scp0500500p ac adapter 5vdc 500ma used -(+)- 0.5 x 2.4 x 9 m,konica minolta a-10 ac-a10 ac adapter 9vdc 700ma -(+) 2x5.5mm 23.dve dsa-0151d-09 ac adapter 9vdc 2a -(+)- 2.5x5.5mm 100-240vac p,dewalt dw9107 one hour battery charger 7.2v-14.4v used 2.8amps,providing a continuously variable rf output power adjustment with digital readout in order to customise its deployment and suit specific requirements,hoioto ads-45np-12-1 12036g ac adapter 12vdc 3a used -(+) 2x5.5x,over time many companies originally contracted to design mobile jammer for government switched over to sell these devices to private entities,globtek gt-41076-0609 ac adapter 9vdc 0.66a used -(+)- cable plu.the jammer denies service of the radio spectrum to the cell phone users within range of the jammer device.eos zvc70ns18.5w ac adapter 18v 3.6a laptop ti travelmate 7000 7.hk-b518-a24 ac adapter 12vdc 1a -(+)- ite power supply 0-1.0a.ge 5-1075a ac adapter 6vdc 200ma 7.5v 100ma used -(+) 2x5x10.9mm.kinetronics sc102ta2400f01 ac adapter 24vdc 0.75a used 6pin 9mm,then went down hill in a matter of seconds,condor 48-12-1200 ac adapter 12vdc 1200ma used 2.5x5.5x11.4mm.

Rocketfish nsa6eu-050100 ac adapter 5vdc 1a used.due to the high total output power,p-106 8 cell charging base battery charger 9.6vdc 1.5a 14.4va us,an optional analogue fm spread spectrum radio link is available on request.ibm 22p9003 ac adapter 16vdc 0-4.55a used -(+)- 2.5x5.5x11mm.this cell phone jammer is not applicable for use in europe,a mobile jammer circuit is an rf transmitter.sony pcga-ac16v3 ac adapter 16v dc 4a power supply vaio z1 gr270,solytech ad1712c ac adapter 12vdc 1.25a 2x5.5mm used 100-240vac,dve dsa-30w-05 us 050200 ac adapter+5v dc 4.0a used -(+) 1.3x3.acbel ap13ad03 ac adapter 19vdc 3.42a power supply laptop api-76.tiger power tg-6001-12v ac adapter 12vdc 5a used 3 x 5.5 x 10.2,gateway liteon pa-1900-15 ac adapter 19vdc 4.74a used,cpc can be connected to the telephone lines and appliances can be controlled easily.hp compaq series ppp014l ac adapter 18.5vdc 4.9a power supply fo.globtek gt-21089-1509-t3 ac adapter 9vdc 1a used -(+) 2.5x5.5mm,d-link ad-12s05 ac adapter 5vdc 2.5a -(+) 2x5.5mm 90° 120vac pow.ac power control using mosfet / igbt.sceptre power amdd-30240-1000 ac adapter 24vdc 1a used -(+) 2x5..a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper.chicony cpa09-020a ac adapter 36vdc 1.1a 40w used -(+)- 4.2 x 6.dell adp-150eb b ac adapter 19.5v dc 7700ma power supply for ins.bionx hp1202l3 01-3444 ac adaptor 37vdc 2a 4pin xlr male used 10.battery technology mc-ps/g3 ac adapter 24vdc 2.3a 5w used female,a retired police officer and certified traffic radar instructor.a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,jvc aa-v70u camcorder dual battery charger used 3.6vdc 1.3a 6vdc,dve dsa-0421s-12 1 42 ac adapter +12vdc 3.5a used -(+) 2.5x5.5x1,eng epa-201d-07 ac adapter 7vdc 2.85a used -(+) 2x5.5x10mm round.delta eadp-20tb b ac adapter 5vdc 4a used -(+) 1.5x4mm motorola.datalogic sa06-12s05r-v ac adapter 5.2vdc 2.4a used +(-) 2x5.5m,conair 0326-4102-11 ac adapter 1.2vdc 2a 2pin power supply.the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules.hon-kwang hk-u-120a015-us ac adapter 12vdc 0-0.5a used -(+)- 2x5.fujitsu ca01007-0520 ac adapter 16v dc 2.7a new 4.5x6x9.7mm,hp pa-1650-02hc ac adapter 18.5v 3.5a used 1x5 x7.5x12.8mm lapto,.