This paper is devoted to optimization of surface acoustic wave bandpass filters with apodized interdigital transducers (IDT). Iterative Parks-McClellan algorithm is applied to estimate the apodization coefficients of the IDT fingers. A family of corresponding subroutines is developed in the Matlab mathematical package. The simulation results of the SAW filter optimized design are illustrated. For the refined estimation of the filter frequency response COM-based P-Matrices are employed. The results obtained in this study constitute a set of tools for the practical calculation of apodized IDTs and filters according to a given specification. Subroutines implementing COM-based P-Matrices can be utilized as part of programs for frequency-selective SAW devices design.

Keywords: acoustoelectronics, apodization, approximation, interdigitated transducer, impulse response, surface acoustic wave, optimization, piezoelectricity, filter, frequency response

Pedestrian navigation systems with redundant number of inertial information sensors have a great potential in reliability, measurement accuracy and low level of noise. Therefore the aim of this article is to investigate the features of constructing the inertial measurement unit comprising the redundant number of the primary information sensors. To achieve this goal, the mathematical model of the measurement unit implemented as a square pyramid with combined sensors of the acceleration, angular velocity and magnetic field strength on its faces was first analyzed. Then, the data processing algorithm of the measurement module was discussed. Finally, the conclusion is made about the feasibility of using the considered redundant measurement unit as the sensing element of a miniature pedestrian navigation systems to provide improved navigation performance.

Keywords: accelerometer, gyroscope, redundancy, inertial navigation, inertial measurement module, aggregation, magnitometer, micromechanical sensor, wearable electronics, personal navigation

The system is intended to automate the procedure of 3D-models calculation and formation for cooling heatsink of electronic components. Based on user input, the system calculates the design parameters of the heatsink in the mathematical core, then data enters the geometric kernel, where the construction and rendering of 3D-model takes place. The system allows to choose the type of heatsink being constructed, the method by calculations will occur, dimensions and material properties. The result is a 3D-model of the heatsink suitable for use in the design process.

Keywords: heatsink, computer-aided design, automation system, radioelectronic equipment, parameterization, geometric modeling, API