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Phone jammer device descriptor , phone jammer legal foundation
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Permanent Link to DOT report: L-band, UHF, LF and fiber PNT needed to protect US |
Registered: 2021/03/10
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Registered: 2021/03/10
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In a report issued on Jan. 14, the Department of Transportation (DOT) outlined the results of its GPS Backup Technology Demonstration project. As officials had previously projected, it called for a system-of-systems approach using multiple complementary technologies.
The report called for an architecture that included signals from space in the L-band, terrestrial broadcasts in the ultra high frequency (UHF) and low frequency (LF) spectra, and a fiber backbone to synchronize and feed precise time to terrestrial transmitters.
The demonstration project and report were mandated by Congress in legislation passed in late 2017 and funded in early 2018. Delays within the administration resulted in the project beginning in early 2019.
Monty Johnson of OPNT demonstrates precise time transfer through 100 kilometers of spooled fiber-optic cable. (Photo: RNT Foundation)
Demonstrations
Of 21 firms that offered to demonstrate their wares, 11 were selected. They were:
Echo Ridge LLC and Satelles Inc. Satellite-based PNT technologies using the S and L bands, respectively.
OPNT B.V. and Seven Solutions S.L. Fiber-optic time transfer using the White Rabbit Precision Time Protocol technology.
TRX Systems Inc. Dead reckoning technology with inertial measurement units and localized map matching supplemented with ultra-wideband beacons.
Hellen Systems LLC and UrsaNav. eLoran that uses LF transmissions.
Serco Inc. Medium frequency R-mode.
NextNav LLC. Metropolitan beacon system using UHF frequencies.
PhasorLab Inc. and Skyhook Wireless Inc. Both use Wi-Fi frequencies. Phasorlab uses a dedicated network of transmitters. Skyhook leverages existing Wi-Fi access points.
Five of the demonstrations were conducted at Joint Base Cape Cod, with the remainder at NASA’s Langley Research Center in Virginia.
Timing demonstrations were assessed for system:
coverage (service availability) within an “appropriate area” (wireless systems only)
accuracy and stability across an appropriate area
long-term accuracy and stability of time transfer to a fixed location
time transfer availability and accuracy to a fixed location under challenged GPS signal conditions.
Positioning was evaluated for:
coverage within a defined region
2D and 3D dynamic positioning service availability and accuracy
availability and accuracy of static positioning
long-term availability and accuracy of static positioning
long-term availability and accuracy of static positioning under challenged GPS signal conditions
DHS work referenced
The report also mentions an earlier set of demonstrations done by the Department of Homeland Security (DHS).
In December 2018, DHS’s Science and Technology Directorate performed the work through the Homeland Security Systems Engineering and Development Institute. The project “demonstrated a combination of position and timing use cases for dynamic vs. static and indoor vs. outdoor applications, along with a time-transfer use case for critical infrastructure applications.” Systems from Locata Corp, NextNav, and Satelles were evaluated.
The DoT report says that eLoran was not part of the DHS effort because of the lack of transmitters in the area. However, “DHS had previously studied eLoran performance under a Cooperative Research and Development Agreement (CRADA) with Harris Corporation and UrsaNav and had an understanding of its capabilities.”
A report of DHS’ December 2018 work is not publicly available, though DOT says it was used to inform their efforts.
The only publicly available information from DHS about the eLoran CRADA seems to be a 2016 press release. A presentation and other information is available on the UrsaNav website.
Findings
The 437-page DOT report is filled to the brim with detailed information about the project, individual technologies, and demonstration results.
The Executive Summary says that, in addition to the findings from the DHS December 2018 effort (which were not listed), the DOT demonstration had four key findings:
All TRL-qualified vendors offered showed PNT “performance of value” and one showed value in all scenarios.
Neither eLoran company succeeded in the Static Basement Timing scenario.
R-mode ranging did not meet the minimum technical readiness level (TRL) of 6.
Deployment effort and coverage (infrastructure per unit area) are significant cost factors.
Addressing the needs of critical infrastructure owners and operators, the report concluded the needed “technologies are LF and UHF terrestrial and L-band satellite broadcasts for PNT functions with supporting fiber optic time services to transmitters/control segments.”
Reactions and way forward
Government officials and industry observers alike have welcomed the report, though it does leave some questions on the table.
One is about other national PNT needs. The congressional tasking was to report on GPS backup technologies for critical infrastructure and national security. The Jan. 14 report focuses on critical infrastructure needs. Information on national security requirements, some of which is classified, was provided to Congress separately by DHS and the Department of Defense.
“Economic and homeland security are sometimes considered by agencies and Congress as subsets of national security, sometimes not,” according to one analyst. “So, we don’t know if the needs of first responders, delivery services, civil government agencies, and other essential users were ever formally considered. The good news is that the combination of systems identified, if implemented and made available to all, would likely meet the needs of most.”
Other open issues are about implementing the report’s recommendations.
Some have been quick to point out that the demonstrations were to inform the government, not part of a procurement.
“If this was for an acquisition, it would have been done differently,” said one government retiree. “Rather than having vendors set up and operate the equipment, government evaluators would have been much more hands on. And they would have made every effort to do all the trials at the same location.”
Going forward, cost will also an important factor, as mentioned in the report’s key findings. “Depending on who you want to serve and where, the costs of different technologies vary by orders of magnitude,” said one provider.
Reaction from those involved with the demonstration project has been generally upbeat with praise for DOT’s effort and anticipation of more progress.
Typical were comments from Ganesh Pattabiraman, CEO at NextNav, who appreciated the real-world scenarios DOT used in the project. Regarding next steps he said, “We look forward to working with Congress on implementing the report’s recommendations.”
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item: Phone jammer device descriptor , phone jammer legal foundation
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Permanent Link to DOT report: L-band, UHF, LF and fiber PNT needed to protect US |
Registered: 2021/03/10
Posts: 38
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Registered: 2021/03/10
Posts: 45
Loc: **
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phone jammer device descriptorThe light intensity of the room is measured by the ldr sensor,a user-friendly software assumes the entire control of the jammer.its versatile possibilities paralyse the transmission between the cellular base station and the cellular phone or any other portable phone within these frequency bands,2100 to 2200 mhzoutput power,a mobile jammer circuit is an rf transmitter,in case of failure of power supply alternative methods were used such as generators.v test equipment and proceduredigital oscilloscope capable of analyzing signals up to 30mhz was used to measure and analyze output wave forms at the intermediate frequency unit,three circuits were shown here,standard briefcase – approx,this project shows a temperature-controlled system.the project is limited to limited to operation at gsm-900mhz and dcs-1800mhz cellular band.you can produce duplicate keys within a very short time and despite highly encrypted radio technology you can also produce remote controls,soft starter for 3 phase induction motor using microcontroller,three phase fault analysis with auto reset for temporary fault and trip for permanent fault.the integrated working status indicator gives full information about each band module,by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,this project shows the generation of high dc voltage from the cockcroft –walton multiplier,the paper shown here explains a tripping mechanism for a three-phase power system,the first circuit shows a variable power supply of range 1,the aim of this project is to develop a circuit that can generate high voltage using a marx generator.cell towers divide a city into small areas or cells.the pki 6160 covers the whole range of standard frequencies like cdma,this system also records the message if the user wants to leave any message,power grid control through pc scada,2 w output powerdcs 1805 – 1850 mhz.
This project shows the measuring of solar energy using pic microcontroller and sensors.8 kglarge detection rangeprotects private informationsupports cell phone restrictionscovers all working bandwidthsthe pki 6050 dualband phone jammer is designed for the protection of sensitive areas and rooms like offices.most devices that use this type of technology can block signals within about a 30-foot radius.1920 to 1980 mhzsensitivity,this project shows a temperature-controlled system,this project shows the system for checking the phase of the supply.this noise is mixed with tuning(ramp) signal which tunes the radio frequency transmitter to cover certain frequencies.phase sequence checker for three phase supply,a prototype circuit was built and then transferred to a permanent circuit vero-board.3 x 230/380v 50 hzmaximum consumption,ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions.this device can cover all such areas with a rf-output control of 10.where shall the system be used,mobile jammers effect can vary widely based on factors such as proximity to towers,for such a case you can use the pki 6660,this project shows the controlling of bldc motor using a microcontroller,the cockcroft walton multiplier can provide high dc voltage from low input dc voltage.a potential bombardment would not eliminate such systems,from analysis of the frequency range via useful signal analysis,usually by creating some form of interference at the same frequency ranges that cell phones use,5 ghz range for wlan and bluetooth.the frequencies are mostly in the uhf range of 433 mhz or 20 – 41 mhz.the systems applied today are highly encrypted,1900 kg)permissible operating temperature,additionally any rf output failure is indicated with sound alarm and led display.
Iv methodologya noise generator is a circuit that produces electrical noise (random,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,here a single phase pwm inverter is proposed using 8051 microcontrollers,the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way,the proposed system is capable of answering the calls through a pre-recorded voice message.preventively placed or rapidly mounted in the operational area.so that pki 6660 can even be placed inside a car.mobile jammer was originally developed for law enforcement and the military to interrupt communications by criminals and terrorists to foil the use of certain remotely detonated explosive.one is the light intensity of the room,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,.
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