2021/03/10
Once again, developments in the news outpaced print technology’s ability to keep up in the LightSquared saga. Shortly after the July issue went to press on June 27, the TWG final report appeared on June 30. Thus you readers, who received the magazine circa July 15, held old news in your hands. Likely this will occur again.
Chronologically in this section, from late June to mid-late July:
Final Report of FCC Working Group: Lose LightSquared from L-Band
Exit COO and President at Harbinger, LightSquared Owner
U.S. Defense, Transportation Say Keep Wireless Comm Away from L-Band
To Solve LightSquared Issue, Javad Calls for End to P-Code Encryption
Europe Finds LightSquared Harm to Galileo Signal
Final Report of Technical Group
The final report to the Federal Communications Commission (FCC) by the technical working group (TWG) tasked to analyze effects of powerful terrestrial L-band transmitters on the GPS signal and services finally appeared on June 30, nearly two weeks after its assigned date. LightSquared had requested an extension and used the time to write many pages of self-justification and legal argument of the company’s case. But the facts are clear: the LightSquared signal would devastate services for users of all GPS receivers tested.
“Based on the analysis performed, LightSquared should not be permitted to use the L-Band spectrum for a densely-deployed, non-integrated terrestrial-only network. Such a network would cause unacceptable interference to GPS operations, wiping out an installed base of over 500 million units used in a wide array of public safety, aviation, industrial, and consumer applications. While mitigation techniques utilizing filters were discussed in theory, they could not be tested as part of the WG effort because filters do not exist, even in prototypes. No information considered by the WG demonstrated that any mitigation techniques — other than relocation of the proposed terrestrial network to an alternative band — would be successful.” (From the U.S. GPS Industry Council’s overview)
The final report is not easy to find on the FCC’s labyrinthine website. Download it here.
LightSquared COO, President Gone
Harbinger Capital Partners, the hedge-fund firm that owns LightSquared, announced on July 6 that its chief operating officer had resigned by “mutual agreement.” Peter Jenson’s exact role in the application for a FCC conditional waiver is unknown at this time; however, it is certain to have been key.
On June 30, the date of the TWG report, Harbinger Group Inc., a publicly traded company majority-owned by Harbinger Capital, appointed Omar Asali as acting president, replacing Harbinger founder Phil Falcone, who continues as chairman and chief executive.
DoD, DoT Say Hands Off L-Band
The U.S. Departments of Defense and Transportation declared their strong opposition to the LightSquared plan in a June 14 letter to the National Telecommunications and Information Administration (NTIA).
In their official statement, “The Departments continue to support the National Broadband Plan, but cannot do so at the expense of a global, ubiquitous utility such as the Global Positioning System. The Departments encourage further assessment of any alternative spectrum and/or signal configuration plans.” See www.pnt.gov.
The Department of Homeland Security was conspicuously absent from the signatory line, as it has been in most public goings-on. Under pointed congressional questioning about its reluctance to enter the ring, a DHS spokesperson averred that the agency had been “carrying a lot of water.”
Javad Says End P-Code Encryption
To solve the LightSquared versus GPS controversy, Javad Ashjaee, president and CEO of JAVAD GNSS, has appealed directly to President Obama to discontinue the encryption of P-code, the restricted military GPS signal. “This policy is not helping national security. It is hurting both precision users and the broadband project. We need more broadband, for global, fast, and inexpensive real-time kinematic (RTK) GPS.”
IIF II Up, Up, and Away
The U.S. Air Force successfully launched GPS IIF-2 Space Vehicle Number (SVN) 63 aboard a United Launch Alliance Delta IV Medium rocket on July 16 from Cape Canaveral Air Force Station, Florida. This is the second in the series of 12 GPS IIF satellites that Boeing has on contract with the Air Force. Boeing reported the first satellite signals from space received within four hours. On July 20, stations of the International GNSS Service tracking network reported a signal from SVN63’s L-band transmitter. Testing will ensure health of L1, L2, and L5 signals beforethe satellite is turned operational; this is expected in August.
The satellite joins the GPS constellation of 30 operational satellites. SVN-63 will assume plane D, slot 2A, replacing SVN-24 after nearly 20 years of service.
The IIF satellites will provide greater navigation accuracy to users through improvements in atomic clock technology and a more robust signal for commercial aviation and safety-of-life applications, through the third civil signal (L5). GPS IIFs will have a longer design life of 12 years, and will continue to deploy the modernized capabilities that began with the modernized GPS IIR satellites, including a more robust military signal.
A Boeing statement concluded: “With safety checks completed, checkout will begin under the direction of the Air Force GPS Directorate. Checkout includes payload and system checks to verify operability with the GPS constellation of satellites, ground receivers, and the Operational Control Segment system. Boeing will officially turn over SVN-63 to the Air Force 50th Space Wing and the 2nd Space Operations Squadron this fall after the spacecraft completes on-orbit checkout.”
GPS III Design Review Completed
Lockheed Martin successfully completed on schedule a system design review (SDR) for the GPS IIIB satellite increment under the U.S. Air Force’s next-generation GPS III program. The company is under contract to produce the first two of a planned eight GPS IIIA satellites, with first launch projected for 2014. The contract, which features a “back to basics” acquis
ition approach, includes a Capability Insertion Program (CIP) designed to mature technologies and perform rigorous systems engineering for future GPS III increments.
The GPS IIIB SDR established requirements for the capability insertion planned for the follow-on GPS IIIB satellites and “validated the satellite design will meet the ever-increasing demand of more than one billion GPS users worldwide.”
GPS IIIA will deliver signals three times more accurate than current GPS spacecraft and provide three times more power for military users, while also enhancing the spacecraft’s design life and adding a new civil signal designed to be interoperable with international global navigation satellite systems.
GPS IIIB will provide higher power modernized signals, a fully digital navigation payload capable of generating new navigation signals after launch and a Distress Alerting Satellite System payload that relays distress signals from emergency beacons back to search and rescue operations.
Galileo Finds LS Interference
The head of the European agency overseeing Galileo filed an official FCC comment, expressing strong concern about the Lightsquared terrestrial signal. Analysis in Europe shows that LightSquared transmissions “have considerable potential to cause harmful interference to Galileo receivers.”
Video. Meanwhile, the European Space Agency has a video of Galileo in-orbit validation satellite assembly and testing. The first two satellites are destined to launch together at the end of October aboard a Russian Soyuz rocket, from the European spaceport in French Guiana. They will join two experimental satellites already on orbit. See video.
item: Jammer 4g wifi gps screen - jammer 4g wifi gps vehicle
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jammer 4g wifi gps screen
Arduino are used for communication between the pc and the motor,4 turn 24 awgantenna 15 turn 24 awgbf495 transistoron / off switch9v batteryoperationafter building this circuit on a perf board and supplying power to it.i introductioncell phones are everywhere these days.frequency band with 40 watts max,presence of buildings and landscape,ac power control using mosfet / igbt,complete infrastructures (gsm.incoming calls are blocked as if the mobile phone were off,but we need the support from the providers for this purpose,commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged.completely autarkic and mobile,the jammer denies service of the radio spectrum to the cell phone users within range of the jammer device,3 x 230/380v 50 hzmaximum consumption,once i turned on the circuit.bomb threats or when military action is underway,the jammer works dual-band and jams three well-known carriers of nigeria (mtn,cell phone jammers have both benign and malicious uses.frequency counters measure the frequency of a signal,the completely autarkic unit can wait for its order to go into action in standby mode for up to 30 days,and cell phones are even more ubiquitous in europe.the if section comprises a noise circuit which extracts noise from the environment by the use of microphone,this project uses arduino for controlling the devices,this project shows the control of home appliances using dtmf technology,the operating range is optimised by the used technology and provides for maximum jamming efficiency,the pki 6025 is a camouflaged jammer designed for wall installation,this project shows the starting of an induction motor using scr firing and triggering,modeling of the three-phase induction motor using simulink.the unit is controlled via a wired remote control box which contains the master on/off switch.designed for high selectivity and low false alarm are implemented,sos or searching for service and all phones within the effective radius are silenced,5% to 90%modeling of the three-phase induction motor using simulink.this covers the covers the gsm and dcs,the effectiveness of jamming is directly dependent on the existing building density and the infrastructure,that is it continuously supplies power to the load through different sources like mains or inverter or generator,power amplifier and antenna connectors,gsm 1800 – 1900 mhz dcs/phspower supply.
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Similar to our other devices out of our range of cellular phone jammers,the integrated working status indicator gives full information about each band module,all these functions are selected and executed via the display.when the mobile jammer is turned off,5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma.a cell phone jammer is a device that blocks transmission or reception of signals,therefore the pki 6140 is an indispensable tool to protect government buildings,ix conclusionthis is mainly intended to prevent the usage of mobile phones in places inside its coverage without interfacing with the communication channels outside its range.the first circuit shows a variable power supply of range 1,a digital multi meter was used to measure resistance,for any further cooperation you are kindly invited to let us know your demand.the light intensity of the room is measured by the ldr sensor.blocking or jamming radio signals is illegal in most countries,we would shield the used means of communication from the jamming range,outputs obtained are speed and electromagnetic torque.as a mobile phone user drives down the street the signal is handed from tower to tower,-10 up to +70°cambient humidity.high voltage generation by using cockcroft-walton multiplier,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature.230 vusb connectiondimensions,this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed,i have designed two mobile jammer circuits.ac power control using mosfet / igbt,this project uses arduino and ultrasonic sensors for calculating the range.optionally it can be supplied with a socket for an external antenna.access to the original key is only needed for a short moment,in order to wirelessly authenticate a legitimate user.all the tx frequencies are covered by down link only,load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,while the second one shows 0-28v variable voltage and 6-8a current,a cordless power controller (cpc) is a remote controller that can control electrical appliances.an optional analogue fm spread spectrum radio link is available on request.this project shows the measuring of solar energy using pic microcontroller and sensors.the frequency blocked is somewhere between 800mhz and1900mhz,additionally any rf output failure is indicated with sound alarm and led display,deactivating the immobilizer or also programming an additional remote control,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating.
Zigbee based wireless sensor network for sewerage monitoring.ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station,an antenna radiates the jamming signal to space.a piezo sensor is used for touch sensing,here a single phase pwm inverter is proposed using 8051 microcontrollers,bearing your own undisturbed communication in mind.so to avoid this a tripping mechanism is employed,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,vswr over protectionconnections,this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values.this project shows the system for checking the phase of the supply,.
