KEYWORDS: Modulation, Orthogonal frequency division multiplexing, Radar, Signal processing, Signal generators, Electronic filtering, Phase shift keying, Data transmission
Within research presented in this article, several radar waveforms were designed. Waveforms based on common simple and complex radiolocational signals were combined using OFDM (Orthogonal Frequency Division Multiplexing). Combined with the ever-increasing technological possibilities, OFDM can be a valuable tool to overcome the challenges of modern radiolocation, such as limited spectrum resources and the improvement of electronic intelligence (ELINT) and electronic warfare (EW) methods. Despite it has become quite common in today's radiolocation, OFDM still appears to be a innovative solution with high development potential and a lot of still unused possibilities. Due to above, an attempt was made to explore the properties of waveforms significantly differing from typical telecommunications modulations. Designed signals were subjected to the analysis of properties in the time and frequency domains using cross-sections of the ambiguity function. The results were compared with the properties of classic radar signals in a given frequency band. The goal of the simulations was to illustrate the potential benefits and losses in the time-frequency waveforms of the synthesized signal compared to classic solutions. Potential degradation of signal parameters is a particularly important issue for combined radar-communication systems. The proprietary element of the study is the synthesis and analysis of signals containing different types of modulation on individual sub-bands simultaneously. The collected results will be used for further research on the methods of synthesis and processing of radiolocation signals using OFDM technology.
KEYWORDS: Field programmable gate arrays, Radar, Convolution, Filtering (signal processing), Logic, Electronic filtering, Process control, Control systems, Signal processing, Digital signal processing
In this paper some capabilities of field programmable gate arrays (FPGA) as a suitable platform for radar applications based on an exemplary implementation of matched filter are discussed. Relations between the resource usage, precision of calculations and design performance are presented. Results of a multi-aspect analysis can help in elaboration of specific implementation conclusions both at the stage of formulating processing algorithms and their implementation. A wider view of the possibilities and limitations of programmable logic in combination with the features of other available platforms leads to the effective use of modern heterogeneous systems, including FPGA, GPU and CPU, which in turn allows to take advantage of the possibilities and compensation for the limitations of those technologies.
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