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By Markus Brandl, Xiaoming Chen, Herbert Landau, Carlos Rodriguez-Solano and Ulrich Weinbach This article updates a July 2012 feature in GPS World, “Real-Time Extended GNSS Positioning: A New Generation of Centimeter-Accurate Networks.” The Trimble CenterPoint RTX correction service, enabling centimeter-level absolute positioning around the world without the need for RTK reference-station infrastructure, is now available to many users, including integrators of professional high-precision equipment and consumer products such as in the automotive sector. Access is provided via a software library compatible with any GNSS device. The corrections now contain detailed integrity information for safety-critical applications. The RTX infrastructure is made up of approximately 120 globally distributed RTX reference stations. Receivers at these stations transmit measurement data at 1 Hz to the RTX server centers, where the correction data is computed. For redundancy purposes, multiple servers in the United States and Europe are operated. A failsafe architecture avoiding any single point of failure in the processing chain has produced a very high availability of corrections. Today the system supports GPS, GLONASS, Galileo, BeiDou and QZSS satellites. It is a multi-frequency system supporting two or more frequencies for each satellite system. The correction stream is available to users using L-band signals broadcast via geostationary satellites and IP connections. The L-band transmitted RTX data stream uses a bandwidth of 600–2400 baud, and a highly compressed data format with a resolution of 1 millimeter, with an average latency of 8 seconds in L-band mode and 5 seconds in IP mode. The data stream is encrypted via an Advanced Encryption Standard (AES) with a key length of 256 bits to guarantee safe transmission. Data transmission integrity is assured with a 32-bit cyclic redundancy check attached to every message. The RTX correction stream provides information on satellite position, satellite clock, ionospheric and tropospheric models, and code and phase biases. The orbit determination is done in real time using a reduced dynamic approach with dynamic models and exploiting the accuracy of the phase measurements after ambiguity fixing. Based on the computed orbits, the satellite clocks are estimated at 1 Hz, where integer ambiguity fixing is performed for the different satellite systems. Next, a single-layer global ionospheric model is computed and represented through spherical harmonics. There are currently two areas with a denser network than the global network; these cover Europe and the mainland U.S. with more than 1,000 base stations. Using these stations, regional ionospheric and tropospheric models are computed, which then provide a fast convergence (RTX-Fast service). The satellite position and clock information has centimeter accuracy and allows the client to compute precise point positioning (PPP) with carrier-phase ambiguity resolution. Table 1 shows service accuracy. Table 1. Accuracy of the RTX corrections from more than three years (June 2015–July 2018) of residuals computation in the European RTX-Fast network. (Table data: authors) Once the ambiguities are resolved, the position solution is accurate to a few centimeters. The global RTX-Standard service provides convergence times of 7 minutes to 20 centimeters (cm) horizontal error (95%) and to 2.5 cm (95%) in 13 minutes as shown in Figure 2. The regional RTX-Fast service (U.S., Europe) provides convergence times of less than a minute with centimeter accuracy. The warmstart convergence time is approximately 13 seconds. Figure 2. Global convergence of RTX out of 52 globally distributed stations covering one month of data. (Image: Trimble) The accuracies specified are achievable with precise Trimble GNSS positioning hardware. For integration into non-Trimble devices, an RTX software library is offered, which gives the user real-time access to the individual data in the RTX correction stream. For use of this library in safety-critical systems such as advanced driving-assisted systems (ADAS) or semi-automated driving, this library was certified to follow the ASIL-B ISO 26262 standard and the automotive ASPICE standard. This library is available for easy integration into third-party applications. In addition to the real-time RTX solution, a web-based post-processing solution is available for public use free of charge. It is possible to upload static Trimble or RINEX files to the server, post-process the measurement data, and retrieve a precise position in various coordinate frames. Service integrity is continuously monitored at independent stations from the RTX tracking networks in Europe and the US. The integrity of the service is provided at the correction data domain. The integrity monitoring part of the RTX system minimizes the risk due to events such as unplanned satellite maneuvers or wrong broadcast ephemeris; satellite signal or clock anomalies; ionospheric storms; or problems in transmitting the RTX correction stream. The monitoring stations compute phase observation residuals (with ambiguity fixing) using the station measurements and the received RTX corrections. These residuals represent the actual errors of the corrections as seen by the monitoring stations at the line-of-sight (Table 1). The thresholds at which corrections are considered as faulty are the following: 0.5 m + QI (quality indicator) for orbit + clock corrections and regional tropospheric models, and 1.0 m + QI for regional ionospheric models. The integrity monitoring consists of two steps (Figure 1): a pre-broadcast check, where potentially faulty corrections are detected and filtered out before leaving the computing server, and a post-broadcast check, where additional errors in the transmission channel are detected and alarms are issued to the users. Figure 1. Generation and transmission of RTX global and regional corrections, including pre- and post-broadcast integrity monitoring. (Image: Trimble) Integrity flags and alarms are constantly inserted into the correction stream and output by the RTX client library. The integrity information notifies clients of the presence of integrity monitoring and provides timely alerts in case of detected correction-data integrity violations. The time-to-alert limit goals are 17 seconds for L-band transmission and 13 seconds for IP transmission for the RTX service. The RTX corrections includes quality indicators. In particular, the quality indicator for the satellite clock includes a “DoNotUse” flag to indicate potential problems with the given satellite. This flag prevents the use of the satellite for positioning when received by the user. The quality indicators of the corrections are indeed a first integrity layer. In 2017 the pre-broadcast integrity monitoring was added to act as a second layer. In 2019, with the addition of the post-broadcast integrity monitoring, a third integrity layer was added to the RTX correction data stream. The RTX system provides access to centimeter-level corrections allowing centimeter positioning on a global basis. RTX-Fast services are available in Europe and the U.S. with pre- and post-broadcast integrity monitoring currently being deployed. The authors are engineers with Trimble Terrasat GmbH, Germany.

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Hipro hp-a0653r3b ac adapter 19vdc 3.42a 65w used.atlinks 5-2418a ac adapter 9vac 400ma ~(~) 2x5.5mm 90° used 120v.80h00312-00 5vdc 2a usb pda cradle charger used -(+) cru6600.ilan f1960i ac adapter 19v 3.42a 34w i.t.e power supply.by activating the pki 6050 jammer any incoming calls will be blocked and calls in progress will be cut off,sony ac-e455b ac adapter 4.5vdc 500ma used -(+) 1.4x4x9mm 90° ro.air rage wlb-33811-33211-50527 battery quick charger,the multi meter was capable of performing continuity test on the circuit board,ryobi op140 24vdc liion battery charger 1hour battery used op242,ad-0920m ac adapter 9vdc 200ma used 2x5x12mm -(+)- 90 degr round.ac dc adapter 5v 2a cellphone travel charger power supply.sony ac-ls5b ac dc adapter 4.2v 1.5a cybershot digital camera,nokia acp-12u ac adapter 5.7vdc 800ma used 1x3.5mm cellphone 35,bti veg90a-190a universal ac adapter 15-20v 5.33a 90w laptop pow,apple macintosh m4402 24vdc 1.875a 3.5mm 45w ite power supply.poweruon 160023 ac adapter 19vdc 12.2a used 5x7.5x9mm round barr.texas instruments zvc36-18 d4 ac adapter 18vdc 2a 36w -(+)- for.fsp fsp130-rbb ac adapter 19vdc 6.7a used -(+) 2.5x5.5mm round b.casio ad-c 52 g ac dc adapter 5.3v 650ma power supply,hp pa-1121-12r ac adapter 18.5vdc 6.5a used 2.5 x 5.5 x 12mm,aiwa ac-d603uc ac adapter 5.5v 250ma 8w class 2 power supply.sony vgp-ac19v39 ac adapter 19.5v 2a used 4.5 x 6 x 9.5 mm 90 de.there are many methods to do this,powerup g54-41244 universal notebook ac adapter 90w 20v 24v 4.5a.oem aa-091a5bn ac adapter 9vac 1.5a used ~(~) 2x5.5mm europe pow,the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules,finecom pa-1300-04 ac adapter 19vdc 1.58a laptop's power sup,tdc power da-18-45d-ei35 ac adapter 4.5v 0.4a 1.8va class 2 tran.lenovo 92p1105 ac dc adapter 20v 4.5a 90w laptop power supply.wowson wdd-131cbc ac adapter 12vdc 2a 2x5.5mm -(+)- power supply,hitek plus220 ac adapter 20vdc 2.5a -(+)- 2.5x5.6 100-240vac use.soft starter for 3 phase induction motor using microcontroller, 5G jammers .zenith 150-308 ac adapter 16.5vdc 2a used +(-) 2x5.5x9.6mm round.arstan dv-9750 ac adapter 9.5vac 750ma wallmount direct plug in,macallister 9804 ac adapter dc 17.5v 1.5a used class 2 battery c,traders with mobile phone jammer prices for buying.konica minolta ac-4 ac adapter 4.7v dc 2a -(+) 90° 1.7x4mm 120va.


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Leap frog 690-11213 ac adapter 9vdc 700ma used -(+) 2x5x11mm 90°,toshiba pa3237e-3aca ac adapter 15vdc 8a used 4 hole pin,.

Cell phone jammer india | cell phone & gps jammer china