Proceedings of SPIE - The International Society for Optical Engineering

Современное состояние, проблемы и направления развития деятельности Технопарка национального исследовательского Иркутского государственного технического университета

Лекции по современной теории уравнений в частных производных

This paper explores tower field constructions and hardware optimizations for the WG-16 stream cipher. The constructions ${\mathbb {F}}_{(((2^2)^2)^2)^2}$ and ${\mathbb {F}}_{(2^{4})^4}$ were chosen because their small subfields enable high speed arithmetic implementations and their regularity provides flexibility in pipeline granularity. A design methodology is presented where the tower field constructions guide how to proceed systematically from algebraic optimizations, through initial hardware implementation, selection of submodules, pipelining, and finally detailed hardware optimizations to increase clock speed. The highest frequency WG(16, 32) keystream generator, obtained for the 65 nm ASIC library, reached a clock speed of 2.44 GHz at 26.3 kGE, and the smallest area keystream generator achieved a clock speed of 0.33 GHz at 9.9 kGE. The highest frequency FPGA implementation on a Xilinx Spartan 6 reached a clock speed of 256 MHz using 631 slices. In addition, the paper demonstrates that LFSR feedback polynomials can be optimized to increase security without hurting performance, and retiming optimizations can be used to increase clock speed without increasing area.

Hardware Optimizations and Analysis for the WG-16 Cipher with Tower Field Arithmetic

Hybrid-reflector multibeam antennas employed in satellite navigation systems transform adopted accelerated spatial filtering algorithms. In order to accelerate the algorithm, the adaptive system selects an amplitude-phase distribution from a set of precalculated distributions for various interference signaling environments in the beam where the interference signal affects the radiation pattern of the main lobe. Specification of the weighted coefficients is performed after the most appropriate amplitude-phase distribution has been selected. Data from the weighted coefficients calculations is used for null formation in radiation patterns of beams where interference affects the side lobes.

Spatial filtering algorithms in adaptive multi-beam hybrid reflector antennas

In this paper, an effective exhaustive search method for the phase ambiguity resolution in angle-measuring equipment of satellite navigation is considered.

The phase ambiguity resolution in the angle-measuring navigation equipment

Considered hardware-software system for research characteristics of noise immunity and accuracy GNSS receiver implemented on the basis of National Instruments hardware platform and programming environment LabView. The complex provides a simulation of the navigation field and the source of interference, the analysis of the received signals, the determination of measurement error of navigation parameters GNSS receiver, the analysis of noise immunity GNSS receiver.

Hardware-software complex for studying the characteristics of GNSS receivers

This paper discusses phase methods for measuring the spatial orientation of objects using satellite navigation equipment. An analysis of methods for resolving phase ambiguity is presented in the paper. The effectiveness and applicability of the single-step methods are discussed in detail. The authors have shown that applying the exhaustive method requires a constellation of 5 - 6 visible satellites. The measurement of signals, having a base length of 1 m transmitted from 8 satellites, demonstrates that an unambiguous solution is achieved practically in all cases.

https://iopscience.iop.org/article/10.1088/1757-899X/94/1/012022/pdf

Phase methods for measuring the spatial orientation of objects using satellite navigation equipment

This paper reviews adaptation algorithms influenced by active interferences in satellite communication systems. A multi-beam antenna is suggested as an adaptive system; it is built on the basis of a hybrid reflector antenna with a 19-element array feed element, which incorporates a modified algorithm for radiation pattern synthesis used for suppressing targeted interferences. As a criterion for this synthesis, antenna gains are used at fixed points. As a result, the size of the objective function and time required for the synthesis can be significantly limited.

https://iopscience.iop.org/article/10.1088/1757-899X/94/1/012010/pdf

V. N. Tyapkin

Papers

The phase ambiguity resolution in the angle-measuring navigation equipment

Spatial filtering algorithms in adaptive multi-beam hybrid reflector antennas

Hardware-software complex for studying the characteristics of GNSS receivers

Phase methods for measuring the spatial orientation of objects using satellite navigation equipment

Adaptation algorithms for satellite communication systems equipped with hybrid reflector antennas