Current Issue : July - September Volume : 2016 Issue Number : 3 Articles : 4 Articles
This paper describes the genesis, the principle of operation and characteristics of selected\nradio-navigation positioning systems, which in addition to terrestrial methods formed a\nsystem of navigational marking constituting the primary method for determining the location\nin the sea areas of Poland in the years 1948ââ?¬â??2000, and sometimes even later. The major ones\nare: maritime circular radio beacons (RC), Decca-Navigator System (DNS) and Differential\nGPS (DGPS), as well as solutions forgotten today: AD-2 and SYLEDIS. In this paper, due\nto its limited volume, the authors have omitted the description of the solutions used by the\nPolish Navy (RYM, BRAS, JEMIOÃ?ÂUSZKA, TSIKADA) and the global or continental\nsystems (TRANSIT, GPS, GLONASS, OMEGA, EGNOS, LORAN, CONSOL) - described\nwidely in world literature....
The problem of indoor navigation is investigated using a Commercial Off-the-Shelf (COTS)\npseudolite system. The system is operated in synchronous and asynchronous mode. It is\nshown that, when the system is operated in synchronous mode, it is unsuitable for deep\nindoor operations: in complex propagation environments, the synchronisation required for\nmetre level navigation is difficult to achieve and different solutions have to be adopted.\nTwo asynchronous approaches are thus considered and indoor navigation with metre level accuracy\nis demonstrated using C/N0 measurements. The approaches use a modified Receiver\nSignal Strength (RSS) navigation algorithm and a weighted centroid technique, respectively.\nIn both cases, a pre-filtering stage has been adopted to enhance the quality of C/N0 measurements.\nThe two methods have been compared under different operating conditions and the\nadvantages and drawbacks of the two techniques have been analysed. The experiments demonstrate\nthat metre level accuracy can be achieved using asynchronous pseudolites. These\nresults are particularly encouraging since they were obtained without exploiting map constraints\nand prior knowledge of the user position....
In the future, social robots will permeate our\ndaily life. An autonomous robot that has to move among\ndifferent buildings needs to manage huge amount of data, as\na consequence it is clear that the configuration of the navigation\nsystem becomes hard to manage. This paper presents\na system, based on a cloud robotics paradigm, conceived\nto allow autonomous robots to navigate in indoor environment,\nwhich are not known a priori. The environment is\ndivided into sub-maps and all the necessary information and\nthe topological representation of the world, are stored into a\nremote cloud infrastructure. By means of specific environmental\ntags, composed of a set of ARTags and QR codes,\nthe robot gets the access to the cloud service and it is able to\nupdate its navigation configuration in a dynamic and automatic\nway. Experiments have been conducted in order to\nchoose an appropriate marker dimension and to demonstrate\nthe feasibility of the proposed procedure....
The drift of inertial navigation system (INS) will lead to large navigation error when a low-cost INS is used in microaerial\nvehicles (MAV). To overcome the above problem, an INS/optical flow/magnetometer integrated navigation scheme is proposed\nfor GPS-denied environment in this paper. The scheme, which is based on extended Kalman filter, combines INS and optical flow\ninformation to estimate the velocity and position of MAV. The gyro, accelerator, and magnetometer information are fused together\nto estimate the MAV attitude when the MAV is at static state or uniformly moving state; and the gyro only is used to estimate\nthe MAV attitude when the MAV is accelerating or decelerating. The MAV flight data is used to verify the proposed integrated\nnavigation scheme, and the verification results show that the proposed scheme can effectively reduce the errors of navigation\nparameters and improve navigation precision....
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