noise

Influence of public transport ergonomic features on passenger's functional state

The article means an analysis of the passenger transport services quality issue. Researches of public transport routes ergonomic features and their influence on a passenger functional condition are provided. The analysis of such indicators as cabin occupancy rate, noise level, vibration, and acceleration was carried out. Mathematical dependences of the passenger functional condition change considering vehicles ergonomic features were constructed. Threshold values of passenger compartment microclimate, providing the stress index normative values were determined.

Analysis of the influence of sample rates on the Allan variance

The paper considers the problem of interpreting the Allan deviation plot for signals from sensors polled more frequently than data are refreshed. The Allan variance is a standard tool for analysis of noise terms inevitably present in signals of inertial sensors. There exists a well-defined algorithm for its calculation both for time domain and frequency domain. Having calculated the Allan variance as a function of time (or frequency) one fetches its square root, called Allan deviation, and builds its plot in a logarithmic format.

Recoverying Form of the Scattering Source Whose Field Is Distorted by the Noise

Scattering signals is one of the basic natural processes, which is a consequence of energy losses and manifests in the form of variety of radiation what propagating in space. The cause of the scattering signal is the interaction with the environment. The result of this interaction is not only scattering but also weakening the signal.

On the one hand scattering is considered as a negative effect, but on the other — as a possible way for finding form of the scatterer of the signal.