The Dynamics of Signals with Spread Spectrum in Sensor Arrays, Some Aspects of Digital Beamforming

This paper will describe the dynamics of spread spectrum signals in sensor arrays. In first part we shall discuss the mathematical representation of an angle modulated carriers where changes of the phases are made according to the values of Barker´s codes but as new method every external element of the code includes an internal code. After that the scanning signal and sensor array are connected analytically and the influence of the sensor array in a dynamical regime is researched. Derived from characteristics of this type of signals, the sensor array is not able to use classical phase compensation for purpose of beam steering. Compensations of time lags of signals should be used to achieve a high resolution in all partial directions. It will work in the most correct way in a frequency-domain using characteristics of Fourier transformation [Tuan Do-Hong, et al., 2003]. Another proposed version in the work is a method where phase compensation (by blocks) with time lag compensation is used. Computer simulated time and space diagrams are displayed for all methods.