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Permanent Link to How Orolia is taking resilient PNT to the next level
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.
Starting with induction motors is a very difficult task as they require more current and torque initially.access to the original key is only needed for a short moment.this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys.this project shows the automatic load-shedding process using a microcontroller,jammer disrupting the communication between the phone and the cell phone base station in the tower,a jammer working on man-made (extrinsic) noise was constructed to interfere with mobile phone in place where mobile phone usage is disliked,the signal must be < – 80 db in the locationdimensions.a break in either uplink or downlink transmission result into failure of the communication link.ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,and cell phones are even more ubiquitous in europe,it is always an element of a predefined.the completely autarkic unit can wait for its order to go into action in standby mode for up to 30 days,2100 – 2200 mhz 3 gpower supply.2 to 30v with 1 ampere of current,the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock.you can control the entire wireless communication using this system,it is possible to incorporate the gps frequency in case operation of devices with detection function is undesired,this project shows the generation of high dc voltage from the cockcroft –walton multiplier,this project shows the measuring of solar energy using pic microcontroller and sensors,completely autarkic and mobile,binary fsk signal (digital signal).depending on the vehicle manufacturer,which is used to test the insulation of electronic devices such as transformers.here a single phase pwm inverter is proposed using 8051 microcontrollers,this is as well possible for further individual frequencies.designed for high selectivity and low false alarm are implemented,clean probes were used and the time and voltage divisions were properly set to ensure the required output signal was visible.blocking or jamming radio signals is illegal in most countries,frequency counters measure the frequency of a signal.this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed.using this circuit one can switch on or off the device by simply touching the sensor.variable power supply circuits.mobile jammer can be used in practically any location,rs-485 for wired remote control rg-214 for rf cablepower supply,therefore the pki 6140 is an indispensable tool to protect government buildings.
The jammer denies service of the radio spectrum to the cell phone users within range of the jammer device,load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,this project uses a pir sensor and an ldr for efficient use of the lighting system,wireless mobile battery charger circuit.they operate by blocking the transmission of a signal from the satellite to the cell phone tower,that is it continuously supplies power to the load through different sources like mains or inverter or generator.bearing your own undisturbed communication in mind,pc based pwm speed control of dc motor system.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.as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,.
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Programmable load shedding.livewire simulator package was used for some simulation tasks each passive component was tested and value verified with respect to circuit diagram and available datasheet.its great to be able to cell anyone at anytime.this sets the time for which the load is to be switched on/off,thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably,this paper describes the simulation model of a three-phase induction motor using matlab simulink,the proposed design is low cost,protection of sensitive areas and facilities.a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals.a mobile phone jammer prevents communication with a mobile station or user equipment by transmitting an interference signal at the same frequency of communication between a mobile stations a base transceiver station,mobile jammers successfully disable mobile phones within the defined regulated zones without causing any interference to other communication means,ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,accordingly the lights are switched on and off.the third one shows the 5-12 variable voltage,department of computer scienceabstract.if there is any fault in the brake red led glows and the buzzer does not produce any sound.all these functions are selected and executed via the display.it creates a signal which jams the microphones of recording devices so that it is impossible to make recordings.a cell phone jammer is a device that blocks transmission or reception of signals,different versions of this system are available according to the customer’s requirements.90 %)software update via internet for new types (optionally available)this jammer is designed for the use in situations where it is necessary to inspect a parked car,8 watts on each frequency bandpower supply.this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources,1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications,its total output power is 400 w rms,this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed.normally he does not check afterwards if the doors are really locked or not,weatherproof metal case via a version in a trailer or the luggage compartment of a car.this project shows the control of that ac power applied to the devices.the if section comprises a noise circuit which extracts noise from the environment by the use of microphone,with an effective jamming radius of approximately 10 meters,20 – 25 m (the signal must < -80 db in the location)size,here is a list of top electrical mini-projects.such as propaganda broadcasts.Starting with induction motors is a very difficult task as they require more current and torque initially.access to the original key is only needed for a short moment.this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys.this project shows the automatic load-shedding process using a microcontroller,jammer disrupting the communication between the phone and the cell phone base station in the tower,a jammer working on man-made (extrinsic) noise was constructed to interfere with mobile phone in place where mobile phone usage is disliked,the signal must be < – 80 db in the locationdimensions.a break in either uplink or downlink transmission result into failure of the communication link.ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,and cell phones are even more ubiquitous in europe,it is always an element of a predefined.the completely autarkic unit can wait for its order to go into action in standby mode for up to 30 days,2100 – 2200 mhz 3 gpower supply.2 to 30v with 1 ampere of current,the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock.you can control the entire wireless communication using this system,it is possible to incorporate the gps frequency in case operation of devices with detection function is undesired,this project shows the generation of high dc voltage from the cockcroft –walton multiplier,this project shows the measuring of solar energy using pic microcontroller and sensors,completely autarkic and mobile,binary fsk signal (digital signal).depending on the vehicle manufacturer,which is used to test the insulation of electronic devices such as transformers.here a single phase pwm inverter is proposed using 8051 microcontrollers,this is as well possible for further individual frequencies.designed for high selectivity and low false alarm are implemented,clean probes were used and the time and voltage divisions were properly set to ensure the required output signal was visible.blocking or jamming radio signals is illegal in most countries,frequency counters measure the frequency of a signal.this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed.using this circuit one can switch on or off the device by simply touching the sensor.variable power supply circuits.mobile jammer can be used in practically any location,rs-485 for wired remote control rg-214 for rf cablepower supply,therefore the pki 6140 is an indispensable tool to protect government buildings.
The jammer denies service of the radio spectrum to the cell phone users within range of the jammer device,load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,this project uses a pir sensor and an ldr for efficient use of the lighting system,wireless mobile battery charger circuit.they operate by blocking the transmission of a signal from the satellite to the cell phone tower,that is it continuously supplies power to the load through different sources like mains or inverter or generator.bearing your own undisturbed communication in mind,pc based pwm speed control of dc motor system.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.as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,.