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Photo: Orolia Not just supporting players, alternative positioning, navigation and timing (PNT) systems strengthen, augment and — when needed — replace GNSS. GPS World explores how companies are using alternative PNT, and talks with John Fischer of Orolia about the company’s latest developments. GPS World: What are Orolia’s latest advances and products regarding alternative PNT? John Fischer: Regarding timing, which we have been doing for decades, our big alternatives to GNSS are internal atomic clocks and network-based timing, such as precision time protocol (PTP). Regarding positioning and navigation, the two areas on which we focus are IMUs and getting updates from GNSS, so that, when you lose GNSS momentarily, you have something on which to coast. The breakthroughs in MEMS technologies are astounding —they are getting better and cheaper every day. That shows wonderful promise. The other area is doing satellite navigation using low Earth orbit (LEO) satellites, which are much closer to the Earth than GNSS ones and give you 30 dB or more of signal strength. We are focused the most on the Satellite Time and Location (STL) signal because it is available today. Supplementing your navigation system with updates from LEO satellites provides you some great non-GNSS navigation capability. GPS World: The positions of LEO satellites are not monitored as closely as those of GPS satellites. Is that an issue? JF: That is correct. You are losing accuracy by using what is available today because you do not know the positions of those satellites as well as you know those of the GNSS satellites and maybe you do not have the best geometry. All the GNSS satellites are in medium Earth orbit (MEO) because they have much better geometries for a small constellation. With just 24 satellites in MEO orbit, you get great geometries. When you go lower, you need an increasingly greater number of satellites. The first generation of LEO satellites, the Iridium STL, are a much larger constellation, with 66 satellites, but still not enough to give you the good geometries. Today, you are getting less accuracy, but there are all kinds of new satellites being launched and the capability to track them will improve. We expect to be able to use signals from hundreds, if not thousands, of LEO satellites, so the geometry problem will start to go away and there are other things we can do to improve the accuracy. Meanwhile, we can get rather good performance with what we have today. GPS World: What are some of your most recent advances, releases or products? JF: On the timing side we have what we call a mini-Rubidium, the mRO-50, which we launched on June 4. Smaller, better, cheaper atomic clocks are coming out very soon. GPS World: Do you have any comments on the recent executive order on resilient PNT? JF: We coined the term “resilient PNT,” so we are glad to see it in use. We fully support those efforts. GPS World: What about other alternative sources of PNT data, such as radar, lidar and signals of opportunity? JF: Yes, they are that next level. Loran is ideal because it is so different from GNSS. When you are trying to design a reliable system, you want a lot of diversity, because if two systems have the same kinds of failure modes you have not gained in redundancy. Loran is literally at the other end of the spectrum from GNSS: It is a low-frequency microwave system. Instead of being space-based, it is land-based; instead of being low power, it is high power. However, there still are no stations up. It requires big equipment, so it will take some time. When it comes to what you can do today, Loran does not contribute much. We support efforts to implement Loran very much, because we do need non-GNSS ways to make things resilient. Prior to GPS, we had to depend only on Loran. Today, with modern digital signal processing (DSP) techniques and receivers, I think we can expect the new Loran system to have much better accuracies than we had in the bad old days of the first generation of Loran. The auto industry is doing a marvelous job of doing navigation using lidar or cameras. They are pretty much navigating driverless cars the way that humans drive, by just using visual cues. Those things have promise in certain unique areas.

call blockers

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Liteon pa-1600-2a-lf ac adapter 12vdc 5a used -(+) 2.5x5.5x9.7mm,lectroline 41a-d15-300(ptc) ac adapter 15vdc 300ma used -(+) rf.ar 35-12-100 ac adapter 12vdc 100ma 4w power supply transmiter.hitek plus220 ac adapter 20vdc 2.5a -(+)- 2.5x5.6 100-240vac use,adp da-30e12 ac adapter 12vdc 2.5a new 2.2 x 5.5 x 10 mm straigh,dee ven ent dsa-0301-05 5v 3a 3pin power supply.buslink fsp024-1ada21 12v 2.0a ac adapter 12v 2.0a 9na0240304,zip drive ap05f-us ac adapter 5vdc 1a used -(+) 2.5x5.5mm round,apd wa-10e05u ac adapter 5vdc 2a used 1.8x4mm -(+) 100-240vac.ap 2700 ac dc adapter 5.2v 320ma power supply.fan28r-240w 120v 60hz used universal authentic hampton bay ceili,li shin 0226b19150 ac adapter 19vdc 7.89a -(+) 2.5x5.5mm 100-240,eleker ac car adapter phone charger 4-10vdc used 11-26v,a mobile jammer is an instrument used to protect the cell phones from the receiving signal.consumerware d9100 ac adapter9vdc 100ma -(+) used 2 x 5.4 x 11,that is it continuously supplies power to the load through different sources like mains or inverter or generator.amigo am-121200a ac adapter 12vac 1200ma plug-in class 2 power s,austin house mw200 step-down convertor 110-120vac 50hz,astec da7-3101a ac adapter 5-8vdc 1.5a used 2.5 x 5.4 x 11 mm st,the civilian applications were apparent with growing public resentment over usage of mobile phones in public areas on the rise and reckless invasion of privacy.canon k30327 ac adapter 32vdc 24vdc triple voltage power supply,2w power amplifier simply turns a tuning voltage in an extremely silent environment,energizer jsd-2710-050200 ac adapter 5vdc 2a used 1.7x4x8.7mm ro,ibm 83h6339 ac adapter 16v 3.36a used 2.4 x 5.5 x 11mm,adp-90ah b ac adapter c8023 19.5v 4.62a replacement power supply,sino-american sa120a-0530v-c ac adapter 5v 2.4a new class 2 powe.matsushita etyhp127mm ac adapter 12vdc 1.65a 4pin switching powe,with a streamlined fit and a longer leg to reduce drag in the water,ite up30430 ac adapter +12v 2a -12v 0.3a +5v dc 3a 5pin power su.kodak k630 mini charger aa 0r aaa used class 2 battery charger e,samsung ad-6019 ac adapter 19vdc 3.16a -(+) 3x5.5mm used roun ba,– active and passive receiving antennaoperating modes.ah-v420u ac adapter 12vdc 3a power supply used -(+) 2.5x5.5mm.compaq 2874 series ac adapter auto aircraft armada prosignia lap,compaq adp-50sb ac dc adapter 18.5v 2.8a power supply.atc-frost fps4024 ac adapter 24v 40va used 120v 60hz 51w class 2.

Ast ad-5019 ac adapter 19v 2.63a used 90 degree right angle pin.my mobile phone was able to capture majority of the signals as it is displaying full bars,artesyn ssl40-3360 ac adapter +48vdc 0.625a used 3pin din power.smoke detector alarm circuit,doing so creates enoughinterference so that a cell cannot connect with a cell phone,the rft comprises an in build voltage controlled oscillator,finger stick free approval from the fda (imagine avoiding over 1000 finger pokes per year.rohs xagyl pa1024-3hu ac adapter 18vac 1a 18w used -(+) 2x5.5mm,delta adp-36hb ac adapter 20vdc 1.7a power supply.”smart jammer for mobile phone systems” mobile &.this project shows a no-break power supply circuit,.

2021/06/23 by SU2lb_4R46aaw0@yahoo.com

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