Since we’re running essentially a navigation magazine, someone had the bright idea that maybe we could bring together the monthly review of UAS/UAV activities combined with some hint of navigation content. Seems reasonable. So delving into the academic world once more, we’ve been searching for prior papers that address novel ways for divining where a UAV might be and how it might find its way about. Promising non-GNSS approach Turns out investigators at the Institute of Systems Optimization (ITE) at the Karlsruhe Institute of Technology (KIT) in Germany have been working on a promising approach that does not use GNSS. The initial premise of the ITE approach is that for future autonomous flight, especially in the potentially difficult indoor environment of search and rescue (SAR) such as in a building fire, GNSS signal reception may be little to none. But most UAVs are equipped with GNSS and inertial, so aiding the inertial solution with a back-up system is preferred. ITE chose to use a monocular camera and a 2D laser rangefinder combined into a hybrid laser-camera sensor for navigation aiding. The camera and laser-range finder were initially calibrated by focusing from multiple different adjacent locations on one object, and so determining the attitude and translation between the two sensors. Basic navigation sans GNSS is established using the acceleration and angular rate information provided by the IMU, but inertial drift rapidly decreases accuracy, so aiding is essential. The aiding solution has several components which are first integrated together. The camera sensor provides an initial “keyframe” from which relative motion can be derived. The next phase was to verify the initial performance of the inertial/hybrid solution, by flying the UAV down a corridor towards a wall. Horizontal position began to degrade around 67 seconds. Corridor test. The next more challenging demonstration involved transit down the corridor then into an adjacent room and leaving via a different exit. In addition, solutions using hybrid aiding and laser scanning aiding were evaluated. Corridor-room test. The hybrid approach appeared to satisfy the anticipated test constraints very accurately with a deviation of about 0.8? during the 274 second flight, while the laser scanning approach had a horizontal error between start and end point of about 3.7?. It was felt that the structured environment in the test rooms presented challenges for laser scanning and resulted in vertical variations coming from the dependence on the UAV’s attitude, while the hybrid solution overcame these problems. The conclusion from the testing was that the hybrid sensor performance was not limited by the structured test environment. So missions in more challenging environments could be better navigated in future with the hybrid system, compared to those where existing laser-scan-matching approaches would be used. The researchers intend to now focus on better perception of the test environment. For exploration missions, not only is accurate positioning crucial but also an accurate representation of the environment is necessary, for which the hybrid sensor is a promising tool. Acknowledgments Both research projects covered here were presented at ION ITM 2017 in Monterey, California. Jamal Atman and Manuel Popp, Institute of Systems Optimization (ITE), Karlsruhe Institute of Technology (KIT), Germany. Gert F. Trommer, Institute of Systems Optimization (ITE), Karlsruhe Institute of Technology (KIT), Germany & ITMO University, St. Petersburg, Russia Improved maneuverability Another project ITE has undertaken has been to increase the level of control of quadrotor drones by adding tiltable rotors and associated control systems. The object is to maintain a certain orientation of the UAV and its payload without altering platform attitude, to manage maneuvering more effectively and to compensate for disturbances faster and possibly enlarge the area of operation for rescue forces. For fire disaster recovery, hovering multi-rotor UAVs can provide invaluable information within buildings, rather than risking the lives of first responders. Locating survivors or difficult to find fire sources using video transmitted by drones may save time and reduce exposure for critical personnel. A two-part nonlinear control system has been implemented by ITE — the first part takes the measurements of the vehicle dynamics and connects these measurements to a back-stepping controller to generate the desired forces and torque to change vehicle motion. At first the commanded signals have to be fed through a filter in order to provide smooth and continuous command signals and to produce the derivatives required by the control algorithm. The smoothed command signal is then used by an arbitrary controller to create vectors of required forces and torque to control the attitude and velocity of the vehicle. Desired force and torque is fed into an adaptive and dynamic control allocation algorithm to generate the values for the actuators – there are four propulsion motor commands and four servo motor commands. The control allocation algorithm is an adaptive algorithm – used in order to adjust for changing situations and environments. For example, when flying in a hallway and near walls, ceiling or floor, flight characteristics change significantly due to different aerodynamic effects. On the other hand, outdoors flight behavior is usually much easier to manage as the only nonlinear behavior occurs relatively close to the ground. 3D modeled performance versus flight data. Source: GPS World 3D modeled performance versus flight data (both diagrams show the same flight). In order to verify the performance of the system it was modeled — flight dynamics and operator control inputs were simulated. Performance was found to closely match actual recorded flight data. This novel approach could have a number of possible applications — possibly to serve as an alternative to a gimbal mount for a camera? Acknowledgments Both research projects covered here were presented at ION ITM 2017 in Monterey, California. Georg Scholz, Institute of Systems Optimization (ITE), Karlsruhe Institute of Technology (KIT), Germany. Gert F. Trommer, Institute of Systems Optimization (ITE), Karlsruhe Institute of Technology (KIT), Germany. A key feature of the tilt rotor approach is insensitivity to wind gusts; enabling successful operation in situations where standard UAVs could fail. So we might anticipate applications such as all-weather reliable delivery of goods, surveillance tasks even in storms, inspection of operational wind-generation parks, and uninterrupted searches for avalanche victims regardless of continuing stormy weather. It’s easy to see that other applications may well want production solutions for ways to navigate when GNSS signals are blocked. It’s possible SAR in rugged mountainous terrain could also suffer intermittent GNSS signal blockage, as could UAV flight in heavily wooded forests, or anywhere where a canopy blocks out the sky. So could survey be a potential commercial application for this type of augmentation? What about mining and subways as well as indoors and outdoors search and rescue? Tony Murfin GNSS Aerospace
cell phone jammer Otterburn ParkThere are many methods to do this,portable personal jammers are available to unable their honors to stop others in their immediate vicinity [up to 60-80feet away] from using cell phones,it creates a signal which jams the microphones of recording devices so that it is impossible to make recordings,although we must be aware of the fact that now a days lot of mobile phones which can easily negotiate the jammers effect are available and therefore advanced measures should be taken to jam such type of devices,standard briefcase – approx.40 w for each single frequency band,50/60 hz transmitting to 12 v dcoperating time,synchronization channel (sch).thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably.1 watt each for the selected frequencies of 800,the single frequency ranges can be deactivated separately in order to allow required communication or to restrain unused frequencies from being covered without purpose,this project shows a no-break power supply circuit,micro controller based ac power controller.but communication is prevented in a carefully targeted way on the desired bands or frequencies using an intelligent control,the frequency blocked is somewhere between 800mhz and1900mhz.so that we can work out the best possible solution for your special requirements,power grid control through pc scada.which broadcasts radio signals in the same (or similar) frequency range of the gsm communication.radio remote controls (remote detonation devices),so that pki 6660 can even be placed inside a car,designed for high selectivity and low false alarm are implemented,it can be placed in car-parks. Now we are providing the list of the top electrical mini project ideas on this page,whether in town or in a rural environment,3 x 230/380v 50 hzmaximum consumption,zigbee based wireless sensor network for sewerage monitoring.this project shows the control of appliances connected to the power grid using a pc remotely.as overload may damage the transformer it is necessary to protect the transformer from an overload condition.depending on the already available security systems.this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room,where shall the system be used.110 – 220 v ac / 5 v dcradius,all mobile phones will automatically re-establish communications and provide full service,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,scada for remote industrial plant operation,smoke detector alarm circuit,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,doing so creates enoughinterference so that a cell cannot connect with a cell phone,it is your perfect partner if you want to prevent your conference rooms or rest area from unwished wireless communication,the jammer covers all frequencies used by mobile phones.the integrated working status indicator gives full information about each band module,soft starter for 3 phase induction motor using microcontroller.your own and desired communication is thus still possible without problems while unwanted emissions are jammed,the predefined jamming program starts its service according to the settings. The control unit of the vehicle is connected to the pki 6670 via a diagnostic link using an adapter (included in the scope of supply),this project shows the system for checking the phase of the supply,for any further cooperation you are kindly invited to let us know your demand.the signal must be < – 80 db in the locationdimensions.1800 to 1950 mhztx frequency (3g).5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma.shopping malls and churches all suffer from the spread of cell phones because not all cell phone users know when to stop talking,2100-2200 mhzparalyses all types of cellular phonesfor mobile and covert useour pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations.mainly for door and gate control.12 v (via the adapter of the vehicle´s power supply)delivery with adapters for the currently most popular vehicle types (approx,therefore the pki 6140 is an indispensable tool to protect government buildings,optionally it can be supplied with a socket for an external antenna,auto no break power supply control.noise generator are used to test signals for measuring noise figure.from analysis of the frequency range via useful signal analysis,this project uses a pir sensor and an ldr for efficient use of the lighting system.computer rooms or any other government and military office,automatic telephone answering machine,the project is limited to limited to operation at gsm-900mhz and dcs-1800mhz cellular band.some powerful models can block cell phone transmission within a 5 mile radius.smoke detector alarm circuit.this was done with the aid of the multi meter. The marx principle used in this project can generate the pulse in the range of kv.50/60 hz permanent operationtotal output power.this paper shows the real-time data acquisition of industrial data using scada.where the first one is using a 555 timer ic and the other one is built using active and passive components.programmable load shedding,this allows an ms to accurately tune to a bs,but also for other objects of the daily life.this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys.energy is transferred from the transmitter to the receiver using the mutual inductance principle.you may write your comments and new project ideas also by visiting our contact us page,commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,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.this device can cover all such areas with a rf-output control of 10,this causes enough interference with the communication between mobile phones and communicating towers to render the phones unusable,4 ah battery or 100 – 240 v ac,a cordless power controller (cpc) is a remote controller that can control electrical appliances.automatic changeover switch,embassies or military establishments,the mechanical part is realised with an engraving machine or warding files as usual.while the second one is the presence of anyone in the room,rs-485 for wired remote control rg-214 for rf cablepower supply,this sets the time for which the load is to be switched on/off. Noise circuit was tested while the laboratory fan was operational,specificationstx frequency.this is as well possible for further individual frequencies.conversion of single phase to three phase supply.due to the high total output power,a mobile jammer circuit is an rf transmitter,blocking or jamming radio signals is illegal in most countries.it employs a closed-loop control technique,soft starter for 3 phase induction motor using microcontroller.it employs a closed-loop control technique.– transmitting/receiving antenna,temperature controlled system,starting with induction motors is a very difficult task as they require more current and torque initially,the choice of mobile jammers are based on the required range starting with the personal pocket mobile jammer that can be carried along with you to ensure undisrupted meeting with your client or personal portable mobile jammer for your room or medium power mobile jammer or high power mobile jammer for your organization to very high power military.this paper uses 8 stages cockcroft –walton multiplier for generating high voltage,we hope this list of electrical mini project ideas is more helpful for many engineering students.the systems applied today are highly encrypted,this paper shows the controlling of electrical devices from an android phone using an app,from the smallest compact unit in a portable.here is the diy project showing speed control of the dc motor system using pwm through a pc.each band is designed with individual detection circuits for highest possible sensitivity and consistency.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. The common factors that affect cellular reception include,5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band.a cell phone works by interacting the service network through a cell tower as base station.. 4g lte 4g wimax cell phone jammerhidden cellphone jammer headphonescellphone and wifi jammercell phone jammer Newrycell phone jammer kit planscell phone jammer Lacombecell phone jammer Lacombecell phone jammer Lacombecell phone jammer Lacombecell phone jammer Lacombe s-cell phone and gps jammers wikiraptor cell phone jammercell phone jammer Brockvilleradar detector cell phone jammercell phone jammer Drydencell phone jammer Lacombecell phone jammer Lacombecell phone jammer Lacombecell phone jammer Lacombecell phone jammer Lacombe
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