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An angular distribution of received signals has a significant impact on their spectral and correlational properties. Most of angular dispersion models do not consider antenna patterns. The developed procedure for determining the propagation path parameters enables a wide range of assessment of the impact of the propagation environment on the received signal properties. In contrast to the other models,...
A significant difficulty in modeling the radio channel is related to adjustment the signal reception angle models to different environmental conditions. In this study, we show the solution to this issue on the example of the uniform elliptical with receiver outside model (UERO). The measurement data taken from open literature, delay and angle spread are the basis for the model adaptation. The relationship...
Numerous measurements show that both the spatial and environmental parameters have a significant effect on the deformation of the autocorrelation function (ACF) and the power spectrum density (PSD) of the received signals. However, the methods of analysis of these characteristics do not include this fact, as previously presented in the literature. For the first time in this paper, ACF and PSD are...
The paper is devoted to the problem of assessing the intensity of the angular power spectrum phenomenon of the received signals as a function of the propagation conditions in environment. To assess the impact of environment on the angular power spectrum, the multi-elliptical propagation model is used. Evaluation of angular power spectrum is shown as a function of the type propagation environment,...
The purpose of this paper is to assess the impact of transmission parameters of propagation environment on the properties of statistical fading. Assessment is shown on the basis of simulation studies that Doppler multi-elliptical channel model (DMCM) is used. Such parameters as level crossing rates (LCR) and average fade durations (AFD) are applied as a measure of intensity fading. In terms of statistical...
An accuracy of each location method depends primarily on an accuracy of a parameter measurements that is the basis of the method. In the case of frequency methods, a frequency stability of a localized emitter is the main factor influencing on the location error. In this paper, the impact of the frequency stability on accuracy of the emitter position in signal Doppler frequency method is analyzed....
In urban environments, a multipath propagation and the Doppler effect are dominant phenomena that negatively affect the quality of service in wireless communications and realization of location methods. This paper presents the localization method of emission source in urban terrain for NLOS conditions based on the Doppler effect. To this aim, authors use the signal Doppler frequency (SDF) method....
Modern warships are often equipped with small airstrips that are dedicated to helicopters or other vertical take-off and landing (VTOL) units. Therefore, this type of vessels should have navigation systems that provide process automation of take-off and landing for these flying units. Currently, the Global Navigation Satellite Systems (GNSS) is used for this purpose. The accuracy of the positioning...
Satellite navigation is now widely used in a land, sea, and air transport. It is easy to forecast the negative effects related to the lack of a signal of the Global Navigation Satellite System (GNSS), especially in the aviation and maritime traffic. In 20th century they were allayed the terrestrial navigation systems, e.g. Decca, Omega, Loran-C. Recently, only eLoran is used, as a backup system for...
Measurement results show that the motion direction of objects has a significant effect on the deformation of the autocorrelation function (ACF) and the power spectrum density (PSD) of the received signals. However, this fact is not included in the analysis of these characteristics previously presented in the literature. In this paper, ACF and PSD are presented as a function of the receiver (Rx) /...
Statistical properties of the direction of signal arrival play an important role in shaping correlation and spectral properties of the received signals. In this study, the adjustment method for the 2D selected model of the probability density function of direction of arrival is presented. Here, we are focusing on adjusting the Gaussian scatter density model (GSDM) to different environmental conditions...
This paper presents simple approximation of the power azimuth spectrum (PAS) that can extend the capabilities of propagation models used in simulation studies for multipath propagation environment. Described angular distribution of power is the first presented analytical form that maps PAS based on the transmission characteristics of the environment. Closeform expression describes three main subset...
The paper is devoted to the question of locating of radio wave emission sources by using of SDF technology. The generalized algorithm to estimate the radio transmitter coordinates has been presented. The Doppler characteristics are the basis to determine the location coordinates of a source. They are obtained as the result of measuring of instantaneous frequency of a signal received on board of an...
In the paper are discussed and reviewed methods of comparative analysis of the measurement data obtained during interlaboratory comparative tests in scope of measurements of radio disturbance according to norm EN 55022. Measures and criteria of evaluation of the tests results are presented. We also present results of the exemplary comparative analysis using discussed in article analytical methods...
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