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Saint Petersburg, Russia

Mikhailova N.V.,SUAI | Vasil'ev M.V.,White Dwarf Ltd.
Gyroscopy and Navigation | Year: 2011

The influence of outer space conditions on the navigation-processing algorithms has been analyzed. The main problems that need to be solved by researchers in developing procedures for digital signal processing in onboard satellite navigation equipment have been described. It has been shown that navigation accuracy depends on the quality of the models for satellite motion and the onboard clock. It has been proposed that the stochastic "random walk" model based on the Kalman filter should be used for clock modeling. It has been demonstrated that this model is much more efficient than the classical polynomial model for GEO satellite navigation. Together with the precise satellite dynamic model, it allows three-dimensional accuracy on the order of 30 m, even in the case when a standard temperature-compensated crystal oscillator is used. © Pleiades Publishing, Ltd., 2011. Source

Mikhaylov N.,St. Petersburg State University of Aerospace Instrumentation | Chernov D.,White Dwarf Ltd.
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2012

The paper introduces the concept of a virtual development lab that was born from cooperation between academia and industry. Shortage of young well-trained engineers and a wish to share the industrial experience that the authors have accumulated over a decade has led one of the authors to teach satellite navigation at a University whilst simultaneously leading an industrial R & D team. The paper presents the results of the use of a virtual lab (VL) that was developed to provide students with hands-on experience in the application of signal processing and automatic control. It is shown that VL has partly bridged the gap between the University training and the needs of industry. However, only an extension of the VL to the virtual development lab (VDL) has allowed the requirements of industry to be fully addressed. VDL is a web-based platform which assists learning by enabling the whole development cycle (design, development, verification) to be conducted in a controlled environment which is similar to industrial one. VDL combines ease of use with real life task setting, thus allowing a student to focus on the essentials of the engineering task. The ease of use is provided by incorporating routine engineering methodology (compilation, linking, testing, and result evaluation) into a graphical user interface (GUI), and a simple and intuitive application user interface (API). Realistic task setting is ensured by the nature of the tasks. The paper provides an explanation of all aspects of the VDL including the initial motivation, the technical and educational framework, its advantages and drawbacks, and the VDL design details. It also provides practical advice for VDL realization. The paper will help future developers of VDLs to deliver this approach. © 2012 IFAC. Source

Mikhailov N.V.,White Dwarf Ltd. | Chistyakov V.V.,White Dwarf Ltd.
Gyroscopy and Navigation | Year: 2013

This paper presents the examples of successful application of the method which reduces load on central processing unit (CPU) of the satellite navigation user equipment. The idea behind the method is to save CPU resources by using only partial set of the input samples during signal processing. The method was used to implement a software correlator in the spaceborne MosaicGNSS receiver and to improve performance of the GPS/GLONASS receiver produced by Mstar Semiconductor (Taiwan) for consumer market. © 2013 Pleiades Publishing, Ltd. Source

Chistyakov V.V.,White Dwarf Ltd. | Mikhailov N.V.,White Dwarf Ltd. | Pospelov S.S.,White Dwarf Ltd. | Vasil'ev M.V.,White Dwarf Ltd. | Vasil'eva N.V.,AUSRIRE OJSC
Gyroscopy and Navigation | Year: 2011

A method of fast first fix using a low-cost GNSS receiver is presented. The method makes it possible to significantly reduce the time to first fix when GNSS ephemerides and good estimates of the initial user position and time are available. It is also proposed to use Doppler measurements for the initial estimation of user coordinates. The expected time to first fix is calculated depending on the input GNSS signal power. © Pleiades Publishing, Ltd., 2011. Source

Bochkovskii A.L.,White Dwarf Ltd. | Mikhailov N.V.,White Dwarf Ltd. | Pospelov S.S.,White Dwarf Ltd.
Gyroscopy and Navigation | Year: 2012

MStar Semiconductor (Taiwan) has completed design and engineering of a combined GPS/GLONASS receiver for consumer market. The purpose of this paper is to inform the GNSS community about this development; in particular, about specific features and architecture of the receiver. Results of receiver preliminary tests under restricted satellite visibility-first, driving a car in urban environment, and, second, a static test in indoor environment-are also presented. © Pleiades Publishing, Ltd., 2012. Source

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