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The pedunculopontine nucleus (PPN) is a small brainstem structure and has attracted attention as a potentially effective deep brain stimulation (DBS) target for the treatment of Parkinson's disease (PD). However, the in vivo location of PPN remains poorly described and barely visible on conventional structural magnetic resonance (MR) images due to a lack of high spatial resolution and tissue contrast...
Determination of altitude information for the safety of aircraft is a very important issue. Although the Linear Frequency Modulated Continuous Wave (LFMCW) was the most commonly used modulation in radar altimeter, the shortcomings of LFMCW that its signal form is simple and it can be easily detected by time-frequency analysis were exposed with the development of the detecting technique. Due to the...
Among many types of modulation, the Frequency Modulated Continuous Wave (FMCW) was the most commonly used modulation technique in radar altimeter. Although FMCW radar altimeter has a good performance in range measurement for radar altimeter [1], it is easily intercepted by time-frequency analysis method such as short time Fourier transform (STFT) and Wigner-Ville Distribution (WVD) due to its simple...
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