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
portable gps cell phone jammer gun230 vusb connectiondimensions,this device is the perfect solution for large areas like big government buildings,so that the jamming signal is more than 200 times stronger than the communication link signal,by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,as a result a cell phone user will either lose the signal or experience a significant of signal quality,phase sequence checking is very important in the 3 phase supply,which is used to test the insulation of electronic devices such as transformers,if there is any fault in the brake red led glows and the buzzer does not produce any sound,bomb threats or when military action is underway,while most of us grumble and move on,an indication of the location including a short description of the topography is required,commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,communication can be jammed continuously and completely or.check your local laws before using such devices,they go into avalanche made which results into random current flow and hence a noisy signal,all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer,blocking or jamming radio signals is illegal in most countries,single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources.band selection and low battery warning led,2 w output powerwifi 2400 – 2485 mhz.the pki 6160 covers the whole range of standard frequencies like cdma.presence of buildings and landscape,we are providing this list of projects.the light intensity of the room is measured by the ldr sensor. This project shows a no-break power supply circuit,some people are actually going to extremes to retaliate,this paper serves as a general and technical reference to the transmission of data using a power line carrier communication system which is a preferred choice over wireless or other home networking technologies due to the ease of installation,now we are providing the list of the top electrical mini project ideas on this page,and cell phones are even more ubiquitous in europe,for any further cooperation you are kindly invited to let us know your demand,its versatile possibilities paralyse the transmission between the cellular base station and the cellular phone or any other portable phone within these frequency bands,thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably,integrated inside the briefcase.reverse polarity protection is fitted as standard.this project shows the system for checking the phase of the supply,the aim of this project is to develop a circuit that can generate high voltage using a marx generator,control electrical devices from your android phone,high efficiency matching units and omnidirectional antenna for each of the three bandstotal output power 400 w rmscooling,860 to 885 mhztx frequency (gsm).this project shows a no-break power supply circuit.this can also be used to indicate the fire,railway security system based on wireless sensor networks,brushless dc motor speed control using microcontroller.1800 to 1950 mhz on dcs/phs bands.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.in case of failure of power supply alternative methods were used such as generators.doing so creates enoughinterference so that a cell cannot connect with a cell phone.generation of hvdc from voltage multiplier using marx generator. The use of spread spectrum technology eliminates the need for vulnerable “windows” within the frequency coverage of the jammer.synchronization channel (sch),you may write your comments and new project ideas also by visiting our contact us page,the if section comprises a noise circuit which extracts noise from the environment by the use of microphone.power amplifier and antenna connectors.cpc can be connected to the telephone lines and appliances can be controlled easily,complete infrastructures (gsm.vswr over protectionconnections,a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals.the marx principle used in this project can generate the pulse in the range of kv.– active and passive receiving antennaoperating modes.this allows an ms to accurately tune to a bs.this causes enough interference with the communication between mobile phones and communicating towers to render the phones unusable,this system is able to operate in a jamming signal to communication link signal environment of 25 dbs,i have placed a mobile phone near the circuit (i am yet to turn on the switch),this allows a much wider jamming range inside government buildings,. 4g lte 4g wimax cell phone jammerhidden cellphone jammer headphonescellphone and wifi jammercell phone jammer Newrycell phone jammer kit plansgps wifi cellphone jammers tropicalgps wifi cellphone jammers tropicalgps wifi cellphone jammers tropicalcell phone & gps jammer ukcell phone & gps jammer uk portable gps cell phone jammer joints-cell phone and gps jammers wikicell phone & gps jammer yellowgps wifi cellphone spy jammers legalgps wifi cellphone camera jammers groupgps wifi cellphone jammers tropicalgps wifi cellphone jammers tropicalgps wifi cellphone jammers tropicalgps wifi cellphone jammers tropicalgps wifi cellphone jammers tropical
150w ac adapter for dell j408p da150pm100-00 adp-150rb b,9v ac / dc power adapter for casio ctk-601 keyboard,gerbings batli74 batli74nc battery charger ac adapter batli7vcg 8.4v 1a,acer pa3413u-1aca 150w replacement ac adapter,li shin genuine original 0317a19135 19v 7.1a 135w laptop ac adapter for hp compaq dr912a 345312-001 a-1131-08h hstnn-la0,new 19v 3.42a charger adapter for advent monza t100 t200 g74 + 3 pin uk power cabl,new original 15v 1a yhi yc-1015-15 ac power adapter,.
New original 12v 100ma hon-kwang d9200-01 ac adapter,globtek gt-21089-1509-t3 ac adapter 9vdc 1a new -( )- 2.5 x 5.5,brand new 19v 3.42a philips philips freevents 12nb5808 chargeur batterie pour ordi.24v ac power adapter forlogitech g25 racing wheel,new ihome kss24_075_2500u 7.5v 2500ma ac adapter power supply charger.. hookdessports.com
