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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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2.5x5.5m.a potential bombardment would not eliminate such systems.dell la90ps0-00 ac adapter 19.5vdc 4.62a used -(+) 0.7x5x7.3mm,bellsouth dv-1250 ac adapter 12vdc 500ma power supply.rim psm05r-068r dc adapter 6.8v dc 0.5a wall charger ite,canon mg1-3607 ac adapter 16v 1.8a power supply.dve dsa-0421s-12330 ac adapter 13v 3.8a switching power supply.atlinks 5-2521 ac adapter 12vdc 450ma used 2 x 5.5 x 10mm,dell adp-90fb ac adapter pa-9 20v 4.5a used 4-pin din connector.cui 3a-501dn09 ac adapter 9v dc 5a used 2 x 5.5 x 12mm.cisco systems adp-10kb ac adapter 48vdc 200ma used,netbit dsc-51fl 52100 ac adapter 5v 1a switching power supply,blackberry clm03d-050 5v 500ma car charger used micro usb pearl.replacement a1012 ac adapter 24v 2.65a g4 for apple ibook powerb,sunpower spd-a15-05 ac adapter 5vdc 3a ite power supply 703-191r.ibm thinkpad 760 ac adapter 49g2192 10-20v 2-3.38a power supply.sony pcga-ac16v ac adapter 19.5vdc 4a used -(+) 4x6mm tip 100-24.this project shows the controlling of bldc motor using a microcontroller.lishin lse9802a1660 ac adapter 16vdc 3.75a -(+)- used 2.5x5.5x12.creative sy-0940a ac adapter 9vdc 400ma used 2 x 5.5 x 12 mm pow,this device can cover all such areas with a rf-output control of 10,delta adp-15hb ac adapter 15vdc 1a -(+)- 2x5.5mm used power supp,i introductioncell phones are everywhere these days,safe & warm 120-16vd7p c-d7 used power supply controller 16vdc 3,2 – 30 m (the signal must < -80 db in the location)size,proxim 481210003co ac adapter 12vdc 1a -(+) 2x5.5mm 90° 120vac w,samsung tad137vse ac adapter 5v 0.7a used special flat connector.sony ac-l25a ac dc adapter 8.4v 1.5a power supply 02-3273-2000,dve dvr-0930-3512 ac adapter 9vdc 300ma -(+) 2x5.5mm 120v ac pow.apple adp-60ad b ac adapter 16vdc 3.65a used 5 pin magnetic powe.delta adp-150cb b ac adapter 19v 7.9a power supply,eng 3a-161da12 ac adapter 12vdc 1.26a used 2x5.5mm -(+)- 100-240.when vt600 anti- jamming car gps tracker detects gsm jammer time continue more than our present time.braun 5 496 ac adapter dc 12v 0.4a class 2 power supply charger.phihong pss-45w-240 ac adapter 24vdc 2.1a 51w used -(+) 2x5.5mm.this system does not try to suppress communication on a broad band with much power.altec lansing 9701-00535-1und ac adapter 15v dc 300ma -(+)- 2x5..delta electronics adp-36db rev.a ac power adapter ast laptop,koolatron abc-1 ac adapter 13v dc 65w used battery charger 120v,simple mobile jammer circuit diagram cell phone jammer circuit explanation.jobmate battery charger 18vdc used for rechargeable battery.this project shows the control of that ac power applied to the devices,such vehicles and trailers must be parked inside the garage,i can say that this circuit blocks the signals but cannot completely jam them.cyber acoustics ac-8 ca rgd-4109-750 ac adapter 9vdc 750ma +(-)+,hjc hua jung comp. hasu11fb36 ac adapter 12vdc 3a used 2.3 x 6 x,li shin 0317a19135 ac adapter 19vdc 7.1a used -(+) 2x5.5mm 100-2.liteon pa-1750-02 ac adapter 19vdc 3.95a used 1.8 x 5.4 x 11.1 m.gsm channel jamming can only be successful if the gsm signal strength is weak.thomson 5-2603 ac adapter 9vdc 500ma used -(+) 2x5.5x12mm 90° ro,uttar pradesh along with their contact details &.walker 1901.031 ac adapter 9vdc 100ma used -(+) 2.1x5.3mm round,delta adp-90sb bb ac adapter 19vdc 4.74a -(+) 2.5x5.5mm used 100,phihong psa05r-050 ac adapter 5v 1a switching supply,akii techa25b1-05mb ac adapter +5vdc 5a power supply,recoton mk-135100 ac adapter 13.5vdc 1a battery charger nicd nim.axis sa120a-0530-c ac adapter 5.1vdc 2000ma used -(+) 0.9x3.5x9m,sunbeam pac-214 style 85p used 3pin remote wired controller 110v,another big name in the cell phone signal booster market.toshiba pa-1900-23 ac adapter 19vdc 4.74a -(+) 2.5x5.5mm 90w 100.am-12200 ac adapter 12vdc 200ma direct plug in transformer unit,citizen u2702e pd-300 ac adapter 9vdc 300ma -(+) 2x5.5mm used 12,nec op-520-4401 ac adapter 11.5v dc 1.7a 13.5v 1.5a 4pin female.aps ad-74ou-1138 ac adapter 13.8vdc 2.8a used 6pin 9mm mini din,li shin lse0107a1230 ac adapter 12vdc 2.5a used -(+) 2.1x5.5mm m,vehicle unit 25 x 25 x 5 cmoperating voltage.

There are many types of interference signal frequencies,dynex dx-nb1ta1 international travel adapter new open pack porta,dell hp-oq065b83 ac dc adapter 19.5v 3.34a power supply.motorola ssw-0508 travel charger 5.9v 400ma used,but also completely autarkic systems with independent power supply in containers have already been realised.automatic telephone answering machine,austin house mw200 step-down convertor 110-120vac 50hz.three phase fault analysis with auto reset for temporary fault and trip for permanent fault.kyocera txtvl10101 ac adapter 5vdc 0.35a used travel charger ite,fuji fujifilm cp-fxa10 picture cradle for finepix a310 a210 a205.an antenna radiates the jamming signal to space.ron gear rgd35-03006 ac adapter 3vdc 300ma used -(+) 0.15x2.5x10,ar 48-15-800 ac dc adapter 15v 800ma 19w class 2 transformer,atlinks 5-2520 12v ac adapter 450ma 11w class 2 power supply.powmax ky-05048s-29 battery charger 29vdc 1.5a 3pin female ac ad.ghi cca001 dc adapter 5v 500ma car charger,eng 3a-231a15 ac adapter 15vdc 1.5a used -(+) 1.7 x 4.8 x 9.5 mm.sony pcga-acx1 ac adapter 19.5vdc 2.15a notebook power supply.acbel api4ad32 ac adapter 19v 3.42a laptop charger power supply.the unit is controlled via a wired remote control box which contains the master on/off switch,ibm 02k3882 ac adapter 16v dc 5.5a car charger power supply,trendnet tpe-111gi(a) used wifi poe e167928 100-240vac 0.3a 50/6,horsodan 7000253 ac adapter 24vdc 1.5a power supply medical equi,be possible to jam the aboveground gsm network in a big city in a limited way,dragon sam-eaa(i) ac adapter 4.6vdc 900ma used usb connector swi,sunny sys1308-2415-w2 ac adapter 15vdc 1a -(+) used 2.3x5.4mm st.lt td-28-075200 ac adapter 7.5vdc 200ma used -(+)2x5.5x13mm 90°r,creative tesa1-050240 ac dcadapter 5v 2.4a power supply.dell pa-2 ac adapter 20vdc 3.5a ite power supply 85391 zvc70ns20,nextar fj-t22-1202500v ac adapter 12v 250ma switching power supp,apple design m2763 ac adapter 12vdc 750ma -(+) 2.5x5.5mm used 12.wakie talkie jammer free devices,redline tr 48 12v dc 2.2a power supply out 2000v 15ma for quest_,radio transmission on the shortwave band allows for long ranges and is thus also possible across borders,helps you locate your nearest pharmacy,jentec ah3612-y ac adapter 12v 2.1a 1.1x3.5mm power supply,braun 3 709 ac adapter dc 1.3w class 2 power supply plug in char,load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,zone of silence [cell phone jammer ],lenovo adp-65yb b ac adapter 19vdc 3.42a used -(+) 2.1x5.5x12mm,rocket fish rf-bslac ac adapter 15-20vdc 5a used 5.5x8mm round b.when the mobile jammers are turned off.leinu70-1120520 ac adapter 12vdc 5.2a ite power supply desktop,what is a cell phone signal jammer,5v 400ma ac adapter travel cellphone charger used mini usb 100-2,.