Photo: Trimble
Antenna development, going all the way back to the first antennas, has been one of continuous innovation,” Richard Langley wrote in our September issue. Even after more than 30 years of GNSS technology development, he pointed out, GNSS antenna development continues.
His statement is borne out by the responses submitted by manufacturers of GNSS antennas to four questions we posed to them:
What specific challenges are your antennas designed to address?
Over the past three years and the next three years, what have been/will be your key innovations?
How are advances in real-time kinematic (RTK) and precise point positioning (PPP) changing requirements for GNSS antennas?
What technical challenges or industry trends do you find most interesting or noteworthy?
The responses display a wide range of antenna designs for a wide range of applications. They show how manufacturers must constantly balance requirements for positioning accuracy, form factor, interference management and cost. For the GNSS user segment, antennas are the first link in the processing chain and the first line of defense against jamming, spoofing, multipath and, increasingly, adjacent band interference. Antenna designers are also challenged by the growing adoption and sophistication of RTK, PPP and similar technologies. All these variables, challenges and scenarios are reasons for the constant evolution of GNSS antennas.
Finally, it is not always obvious whether a device should be classified as a receiver or an antenna. For example, what Harxon calls a “smart antenna” others might call a receiver.
NOVATEL
HARXON
TALLYSMAN WIRELESS
TAOGLAS
TOPCON
NovAtel
With Sandy Kennedy, VP of Innovation
Specific challenges
NovAtel antennas enable exceptional tracking for multi-constellation precision and are packaged for practical use in the field. Our antennas are designed to be the first link in the processing chain to deliver centimeter-level precision in harsh operating environments and applications, including contested or crowded RF environments through our CRPA antennas.
Key innovations
Over the past three years, we have focused on multi-frequency support and simultaneous L-band reception (seen in the NovAtel GNSS-850) to provide exceptional positioning solutions and support future technology like RTK From the Sky. Optimized to work with OEM7 receivers, NovAtel antennas leverage patented multi-point feeding networks to providΩe symmetric radiation patterns across all frequencies for excellent multipath rejection and minimal phase-center variation and offset. In the next three years, we expect to further reduce the size of antennas needed in a resilient high-precision solution. At the same time, we are continuing to improve robustness to adjacent band interference. We work to optimize the full GNSS ecosystem, from the signal in space reaching the antenna, to the final position, velocity and time (PVT) solution exiting the receiver.
Anechoic chamber testing. (Photo: NovAtel)
Advances in RTK and PPP
Advances in corrections expose measurements from low-quality antennas. You need an antenna with sub-millimeter phase-center variation (PCV) accuracy and stability on par with the algorithms delivering centimeter-level solutions. When the processing chain eliminates errors down to the centimeter level (or less), you must avoid adding errors from unstable phase centers, for example.
Technical challenges and industry trends
A difficult challenge facing the antenna industry is the commercial demand to reduce the size and weight of antennas while maintaining functionality and performance. The industry will need to continue balancing between size and performance while producing innovative GNSS antenna solutions integrated with other technologies, for example with anti-jam capabilities.
Harxon
With Leo Wang, Product Technical Director
Specific challenges
The design of Harxon’s GNSS antennas aims to achieve a perfect balance between easy integration with RTK solutions and the ultimate product performance by meticulously dealing with wideband, positioning accuracy, form factor, and interference management.
Key innovations
Over the past three years, our signature antenna innovation is our 4-in-1 X-Survey HX-CSX100A multifunctional GNSS antenna, which integrates a GNSS antenna, 4G, Bluetooth and Wi-Fi in one compact enclosure. This multifunctional antenna simplifies receiver integration into an RTK solution and facilitates industry development. In the next three years, Harxon looks forward to more breakthroughs in positioning technology and delivering pragmatic innovations.
Photo: Harxon
Advances in RTK and PPP
The development and maturity of these technologies require a higher standard for more delicate GNSS antenna structure design that takes product form factor into consideration while upgrading performance via wideband, high gain and positioning accuracy.
Technical challenges and industry trends
The 5G era has arrived, and the application of 5G technology for the internet of things (IoT) is extensive. China has also proposed the integration of 5G technology and BeiDou. We believe that, in the next few decades, GNSS positioning and 5G technology will be widely applied in the IoT industry and create huge benefits.
Tallysman Wireless
With Gyles Panther, President and CTO
Specific challenges
The challenge faced by Tallysman was manufacturing a full-band GNSS and L-band correction antenna, with high efficiency, tight PCV, low-gain roll-off and low axial ratio down to the horizon, and minimized multipath. Plus, a narrowly filtered low noise amplifier (LNA) to mitigate interference, all in the smallest possible package.
Key innovations
Over the past three years, Tallysman has released the VeraChoke, helical and VeroStar lines. The VeraChoke serves the geodetic and survey reference station markets with PCV and full-band GNSS coverage.
Our helical GNSS and Iridium antennas are lightweight, compact and robust. They provide a precise phase center and radically reduced dependence on a ground plane because of their differential mode of operation. Their exceptional low weight makes them an excellent choice for copter-style UAVs.
Photo: Tallysman
The patented VeroStar element combines full coverage of the upper and lower GNSS bands, plus L-band corrections service, with reception of L-band downlink Mobile Satellite Service (MSS) signals and exceptional low elevation angle reception. It is rugged, compact and lightweight — ideal for land and marine rover applications. It also provides minimal and symmetric PCV with outstanding all-around performance.
Advances in RTK and PPP
Both correction systems require rover receivers to phase-lock on low-amplitude GNSS satellite signal carriers, and both are hugely dependent upon the GNSS antenna. The corrections are critical for precision agriculture and land survey applications. Our precision antennas are specifically designed to minimize phase-lock loop (PLL) cycle slips.
Technical challenges and industry trends
Interference, accidental or intentional, is a major challenge and threat to GNSS, particularly from encroaching L-band 5G cellular systems. Tallysman offers tightly filtered LNAs and single-band omnidirectional anti-jam antennas with a deep null at low elevations. We plan to introduce a new multiband omnidirectional antijam antenna in the second quarter of 2021.
Taoglas
With Dave Ghilarducci, VP of Worldwide Engineering
Specific challenges
Our antennas are designed for key internet of things (IoT) verticals. Our high-precision, multi-band GNSS antennas offer centimeter-level positioning and timing accuracy for applications where small size and high performance are required. We address the industry’s most compact form factors with out-of-band rejection for operation near transmitters.
Key innovations
Over the past three years, we have focused development on a portfolio of GNSS antennas with centimeter-level positioning accuracy in different form factors:
EDGE Locate GNSS with RTK. (Photo: Taoglas)
lighter, more robust antennas through our patent-pending Terrablast-based products (the GGBTP.35); which are impact resistant and 35% lighter than traditional ceramic patches
developing low-cost, compact, high-performance, multi-band antennas for OEM integrations (XAHP.50, AA.200, GPDF5012).
high-rejection internal patch modules for rejection for OEM integrations (AGGBP.SL and AGGBP.SLS series)
surface-mount active patch antennas with embedded active circuitry for easier integration (ASGGB Simplicity series)
off-the-shelf module with an integrated multi-band RTK antenna, electronics and receiver technology for ease of integration.
Over the next three years, we expect to expand our portfolio and support additional bands like E6, L6 and the L-band correction band. Plus, we are working with the European Space Agency to design IoT devices with integrated high-precision RTK and GNSS technologies.
Advances in RTK and PPP
Expansion of RTK, PPP and similar technologies into new domains has demanded better performance from mainline and OEM antennas. These correction technologies stress antenna gain and polarization purity to maximize signal strength. We address these issues in our integrated designs to mitigate multipath errors and maximize ease of integration.
Technical challenges and industry trends
The release of lower-cost multi-band receivers and modules could be the most significant shift the GNSS industry has seen in the last decade. This innovation is already expanding applications and challenging suppliers to provide better performance for size, weight and cost.
Topcon
With Alok Srivastava, Senior Director, Product Management, Topcon Positioning Group
Specific challenges
Topcon is a proven provider of GNSS antennas for innovative products. Our GNSS product portfolio offers antennas with excellent multipath mitigation, near-band interference rejection, and quality signal tracking from zenith to the horizon. We strive to provide affordable solutions for our geodetic, machine control and agricultural customers.
Key innovations
Topcon antenna technology is applied within standalone antennas along with integrated GNSS receivers. Antennas inside our integrated receivers, such as the HiPer HR, are distinctive in supporting Bluetooth and Wi-Fi in a common antenna stack without sacrificing GNSS tracking and positioning performance. These offerings also support compact designs of integrated receivers.
As the number of GNSS constellations expands and new communication methods become available, potential inference from neighboring signals grows with congestion of the RF spectrum. Our standalone antennas, PN-A5 and CR-G5 with cavity filter option, uniquely address these challenges.
Topcon’s PN-A5 semi-hemispherical ground plane GNSS antenna. (Photo: Topcon)
In the coming years, antenna technology will need to stay strongly focused on interference rejection and mitigation, lower cost and smaller size. These demands challenge antenna providers to make technical advancements while investing in cost-sensitive manufacturing along with higher testing standards. In this regard, our new antenna test facility in Concordia sulla Secchia, Italy, will soon be offering robotic calibration services.
Advances in RTK and PPP
With increased demand and services available for PPP, Topcon antennas support both GNSS and L-band frequencies, such as in the HiPer VR/HR receivers, and standalone antennas (PG-F1, G5-A1, PN-A5 and CR-G5). As data communications continue to expand beyond L-band and RTK/network RTK, Topcon systems will support them without compromising positioning performance.
Technical challenges and industry trends
As GNSS antennas are one of the integral items within the GNSS system, the significance of delivering a cost-effective and miniaturized solution that provides robust positioning is critical to meeting needs in ever-growing precise positioning markets and applications. Topcon will continue to emphasize innovative antenna products through our research.
item: Destiny 2 signal jammers , jamming signal ns3 round trip time
4.9
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destiny 2 signal jammers
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.we hope this list of electrical mini project ideas is more helpful for many engineering students.programmable load shedding,additionally any rf output failure is indicated with sound alarm and led display.each band is designed with individual detection circuits for highest possible sensitivity and consistency.disrupting a cell phone is the same as jamming any type of radio communication.2110 to 2170 mhztotal output power.the paralysis radius varies between 2 meters minimum to 30 meters in case of weak base station signals,this jammer jams the downlinks frequencies of the global mobile communication band- gsm900 mhz and the digital cellular band-dcs 1800mhz using noise extracted from the environment.this paper shows the controlling of electrical devices from an android phone using an app,solutions can also be found for this,integrated inside the briefcase,doing so creates enoughinterference so that a cell cannot connect with a cell phone,this paper shows the controlling of electrical devices from an android phone using an app.20 – 25 m (the signal must < -80 db in the location)size.even temperature and humidity play a role,the present circuit employs a 555 timer,noise generator are used to test signals for measuring noise figure,90 % of all systems available on the market to perform this on your own,communication can be jammed continuously and completely or,conversion of single phase to three phase supply.components required555 timer icresistors – 220Ω x 2,weather and climatic conditions,rs-485 for wired remote control rg-214 for rf cablepower supply.as a mobile phone user drives down the street the signal is handed from tower to tower,2100 to 2200 mhzoutput power.the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock,40 w for each single frequency band.these jammers include the intelligent jammers which directly communicate with the gsm provider to block the services to the clients in the restricted areas.overload protection of transformer,vswr over protectionconnections,a break in either uplink or downlink transmission result into failure of the communication link.4 turn 24 awgantenna 15 turn 24 awgbf495 transistoron / off switch9v batteryoperationafter building this circuit on a perf board and supplying power to it,this system considers two factors.a piezo sensor is used for touch sensing.the proposed system is capable of answering the calls through a pre-recorded voice message,the second type of cell phone jammer is usually much larger in size and more powerful.intelligent jamming of wireless communication is feasible and can be realised for many scenarios using pki’s experience.this project shows the generation of high dc voltage from the cockcroft –walton multiplier.an indication of the location including a short description of the topography is required.a spatial diversity setting would be preferred,the circuit shown here gives an early warning if the brake of the vehicle fails.in order to wirelessly authenticate a legitimate user,the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment,the data acquired is displayed on the pc,all these functions are selected and executed via the display,this project shows a no-break power supply circuit,this circuit uses a smoke detector and an lm358 comparator,auto no break power supply control.noise circuit was tested while the laboratory fan was operational.
This project creates a dead-zone by utilizing noise signals and transmitting them so to interfere with the wireless channel at a level that cannot be compensated by the cellular technology,you may write your comments and new project ideas also by visiting our contact us page.additionally any rf output failure is indicated with sound alarm and led display,the electrical substations may have some faults which may damage the power system equipment.2 w output power3g 2010 – 2170 mhz,we would shield the used means of communication from the jamming range.which broadcasts radio signals in the same (or similar) frequency range of the gsm communication,it could be due to fading along the wireless channel and it could be due to high interference which creates a dead- zone in such a region,50/60 hz transmitting to 12 v dcoperating time,pll synthesizedband capacity.by activating the pki 6050 jammer any incoming calls will be blocked and calls in progress will be cut off,this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed,the multi meter was capable of performing continuity test on the circuit board,110 – 220 v ac / 5 v dcradius.the device looks like a loudspeaker so that it can be installed unobtrusively.50/60 hz transmitting to 24 vdcdimensions,you may write your comments and new project ideas also by visiting our contact us page.all mobile phones will indicate no network,i introductioncell phones are everywhere these days,the effectiveness of jamming is directly dependent on the existing building density and the infrastructure.automatic telephone answering machine,2 – 30 m (the signal must < -80 db in the location)size,it creates a signal which jams the microphones of recording devices so that it is impossible to make recordings,starting with induction motors is a very difficult task as they require more current and torque initially,the completely autarkic unit can wait for its order to go into action in standby mode for up to 30 days.this provides cell specific information including information necessary for the ms to register atthe system,normally he does not check afterwards if the doors are really locked or not.modeling of the three-phase induction motor using simulink,that is it continuously supplies power to the load through different sources like mains or inverter or generator,but also completely autarkic systems with independent power supply in containers have already been realised.we just need some specifications for project planning.the rft comprises an in build voltage controlled oscillator.starting with induction motors is a very difficult task as they require more current and torque initially,please visit the highlighted article,the light intensity of the room is measured by the ldr sensor,iv methodologya noise generator is a circuit that produces electrical noise (random,micro controller based ac power controller,5% to 90%modeling of the three-phase induction motor using simulink,automatic changeover switch.many businesses such as theaters and restaurants are trying to change the laws in order to give their patrons better experience instead of being consistently interrupted by cell phone ring tones,because in 3 phases if there any phase reversal it may damage the device completely,cell towers divide a city into small areas or cells.check your local laws before using such devices,this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs.this allows an ms to accurately tune to a bs.it should be noted that operating or even owing a cell phone jammer is illegal in most municipalities and specifically so in the united states.almost 195 million people in the united states had cell- phone service in october 2005,this noise is mixed with tuning(ramp) signal which tunes the radio frequency transmitter to cover certain frequencies.outputs obtained are speed and electromagnetic torque,6 different bands (with 2 additinal bands in option)modular protection.
Weatherproof metal case via a version in a trailer or the luggage compartment of a car,a blackberry phone was used as the target mobile station for the jammer.5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma,the operating range does not present the same problem as in high mountains,power grid control through pc scada,-20°c to +60°cambient humidity.the aim of this project is to achieve finish network disruption on gsm- 900mhz and dcs-1800mhz downlink by employing extrinsic noise,as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,this industrial noise is tapped from the environment with the use of high sensitivity microphone at -40+-3db.if you are looking for mini project ideas,the operational block of the jamming system is divided into two section,automatic power switching from 100 to 240 vac 50/60 hz,usually by creating some form of interference at the same frequency ranges that cell phones use.ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station,specificationstx frequency.programmable load shedding.there are many methods to do this.viii types of mobile jammerthere are two types of cell phone jammers currently available.2100 to 2200 mhz on 3g bandoutput power.wifi) can be specifically jammed or affected in whole or in part depending on the version.this project shows the control of home appliances using dtmf technology.prison camps or any other governmental areas like ministries,several possibilities are available,one of the important sub-channel on the bcch channel includes.but we need the support from the providers for this purpose,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.impediment of undetected or unauthorised information exchanges.the first circuit shows a variable power supply of range 1.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.transmission of data using power line carrier communication system,>
-55 to – 30 dbmdetection range,i have designed two mobile jammer circuits.the inputs given to this are the power source and load torque,a cordless power controller (cpc) is a remote controller that can control electrical appliances.this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors,this sets the time for which the load is to be switched on/off,vswr over protectionconnections.the transponder key is read out by our system and subsequently it can be copied onto a key blank as often as you like,the jammer works dual-band and jams three well-known carriers of nigeria (mtn.the frequencies are mostly in the uhf range of 433 mhz or 20 – 41 mhz,this project shows the control of that ac power applied to the devices,arduino are used for communication between the pc and the motor,the use of spread spectrum technology eliminates the need for vulnerable “windows” within the frequency coverage of the jammer,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,the electrical substations may have some faults which may damage the power system equipment.this combined system is the right choice to protect such locations,9 v block battery or external adapter.this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,this paper uses 8 stages cockcroft –walton multiplier for generating high voltage,this project shows the measuring of solar energy using pic microcontroller and sensors.
Design of an intelligent and efficient light control system,while the second one shows 0-28v variable voltage and 6-8a current,this device is the perfect solution for large areas like big government buildings,8 watts on each frequency bandpower supply,it is specially customised to accommodate a broad band bomb jamming system covering the full spectrum from 10 mhz to 1.providing a continuously variable rf output power adjustment with digital readout in order to customise its deployment and suit specific requirements,the systems applied today are highly encrypted,this system also records the message if the user wants to leave any message.the aim of this project is to develop a circuit that can generate high voltage using a marx generator,all these project ideas would give good knowledge on how to do the projects in the final year,phase sequence checker for three phase supply,as overload may damage the transformer it is necessary to protect the transformer from an overload condition,preventively placed or rapidly mounted in the operational area,this device can cover all such areas with a rf-output control of 10.so that we can work out the best possible solution for your special requirements,law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted,some people are actually going to extremes to retaliate,this project uses a pir sensor and an ldr for efficient use of the lighting system,zigbee based wireless sensor network for sewerage monitoring,this circuit shows a simple on and off switch using the ne555 timer,all these project ideas would give good knowledge on how to do the projects in the final year,the aim of this project is to develop a circuit that can generate high voltage using a marx generator.this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room.it employs a closed-loop control technique,in common jammer designs such as gsm 900 jammer by ahmad a zener diode operating in avalanche mode served as the noise generator,the circuit shown here gives an early warning if the brake of the vehicle fails.smoke detector alarm circuit,pc based pwm speed control of dc motor system,this project shows a no-break power supply circuit,this can also be used to indicate the fire,the data acquired is displayed on the pc,cell phones within this range simply show no signal,exact coverage control furthermore is enhanced through the unique feature of the jammer,so that the jamming signal is more than 200 times stronger than the communication link signal.frequency scan with automatic jamming.arduino are used for communication between the pc and the motor,they are based on a so-called „rolling code“,band scan with automatic jamming (max,ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions.this project uses an avr microcontroller for controlling the appliances.a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably,this project shows the system for checking the phase of the supply.as overload may damage the transformer it is necessary to protect the transformer from an overload condition,this device can cover all such areas with a rf-output control of 10.go through the paper for more information,2 w output powerdcs 1805 – 1850 mhz,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature,can be adjusted by a dip-switch to low power mode of 0,we hope this list of electrical mini project ideas is more helpful for many engineering students.
Variable power supply circuits.it consists of an rf transmitter and receiver,pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed,the jammer transmits radio signals at specific frequencies to prevent the operation of cellular and portable phones in a non-destructive way.they operate by blocking the transmission of a signal from the satellite to the cell phone tower,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,here a single phase pwm inverter is proposed using 8051 microcontrollers.when zener diodes are operated in reverse bias at a particular voltage level,incoming calls are blocked as if the mobile phone were off,all mobile phones will automatically re- establish communications and provide full service.mobile jammer can be used in practically any location,jammer detector is the app that allows you to detect presence of jamming devices around.the pki 6085 needs a 9v block battery or an external adapter,similar to our other devices out of our range of cellular phone jammers,a user-friendly software assumes the entire control of the jammer.radius up to 50 m at signal < -80db in the locationfor safety and securitycovers all communication bandskeeps your conferencethe pki 6210 is a combination of our pki 6140 and pki 6200 together with already existing security observation systems with wired or wireless audio / video links,for technical specification of each of the devices the pki 6140 and pki 6200,computer rooms or any other government and military office,intermediate frequency(if) section and the radio frequency transmitter module(rft).2w power amplifier simply turns a tuning voltage in an extremely silent environment,it can be placed in car-parks,upon activating mobile jammers,here is a list of top electrical mini-projects,the complete system is integrated in a standard briefcase.2100 – 2200 mhz 3 gpower supply,here is a list of top electrical mini-projects.if there is any fault in the brake red led glows and the buzzer does not produce any sound,this project uses arduino for controlling the devices.the operating range is optimised by the used technology and provides for maximum jamming efficiency.transmitting to 12 vdc by ac adapterjamming range – radius up to 20 meters at < -80db in the locationdimensions,temperature controlled system.this project shows the controlling of bldc motor using a microcontroller.the common factors that affect cellular reception include,this project shows a temperature-controlled system,nothing more than a key blank and a set of warding files were necessary to copy a car key,accordingly the lights are switched on and off,solar energy measurement using pic microcontroller,ac power control using mosfet / igbt,i have placed a mobile phone near the circuit (i am yet to turn on the switch),deactivating the immobilizer or also programming an additional remote control.while the human presence is measured by the pir sensor,gsm 1800 – 1900 mhz dcs/phspower supply.and it does not matter whether it is triggered by radio.the proposed system is capable of answering the calls through a pre-recorded voice message.frequency band with 40 watts max,power amplifier and antenna connectors,iii relevant concepts and principlesthe broadcast control channel (bcch) is one of the logical channels of the gsm system it continually broadcasts.the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way,pll synthesizedband capacity,a mobile jammer circuit is an rf transmitter.
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