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This paper presents a simulation of the principle of antenna type Crow's nest. The crow' nest antenna is a phased array antenna with radiating elements distributed randomly in a sphere. The random distribution of elements contributes to avoid grating lobes and the spherical shape allows full elevation and azimuth coverage of pencil-beam steering. Phase of each element depends on steering direction...
In order to determine position, GPS receiver needs to know navigation message which is obtained by demodulating received signal. Demodulating process requires the local harmonic signal and received signal must have pretty good phase alignment. So the phase locked loop is employed to track phase of received signal. This paper implements the phase locked loop to track the GPS signal. Basic principle...
Nowadays, application of GPS is employed more and more in aviation field for purpose of positioning and navigation. GPS device is use to support other navigation device or it can act as secondary navigation instrument by itself. Very well-known problems of GPS signal are Doppler affect and very low level of signal, which are caused by long distance and high speed motion of satellite transmitters....
□ Architecture of VTL based on DLL was shown and demonstrated and implemented in Matlab by a software receiver. □ The VTL showed better performance in comparing to STL. □ Phase of signal can be tracked to 36s without signal availability □ Disadvantages and future works □ The software cannot run real time. □ Covariance matrix is switch manually. □ VTL based on carrier tracking loop.
This paper deals with operating conditions of aircraft electrical components and shows what effect these conditions have on the dependability of particular components and systems. Two aviation incidents are described and their reasons and results are presented. The mechanical design of a difference minimal relay DMR-400 and its influence on a power electrical system of Aero L-39C Albatros aircraft...
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