Evaluation of the Possibility of Ultra-Wideband Signals Detection

• Main Author: S. L. Chernyshev
• Format: Article
• Language: Russian
• Published: MGTU im. N.È. Baumana 2014-01-01
• Series: Nauka i Obrazovanie
• Subjects: Ultra-Wideband signal; matched filtering; signal processing; detection characteristics
• Online Access: http://technomag.edu.ru/jour/article/view/706

Investigations were carried out to assess the possibility for detecting the ultra-wideband signals of unknown shape. Due to the fact that the geometrical length of the UWB signal is much smaller than the length of target, filter is matched with the radiated signal rather than with the signal reflected from the target, with subsequent treatment in a block in two periods. An output signal of the matched filter and output signal of second unit were obtained on the basis of simulation modeling. Signal/noise ratio at the output of the filter and at the output of the second block were calculated. The signal at the the first filter output is a sequence of correlation functions of a single signal. Improved signal-noise ratio after preliminary matched filter was proved. This enables us to improve the performance of the next block. With the signal/noise ratio at the input of the detector being equal to 6 dB, its increase by 5 - 6 dB was obtained. The implementations of possible signals were investigated, and significant noise elimination was shown. Signal at output of a single detector without first filter was obtained. Analysis results have shown that such detector has a significantly poorer properties than the proposed one. The paper gives detecting characteristics of the optimal detector of the known shape signal, detector with the processing in two adjacent periods, and detector having proposed circuit. The optimal detector has the best characteristics, the detector of the second type possesses the worst one, while the characteristics of the proposed detector is close to that of the optimal detector.