KEYWORDS: Ice, Detection and tracking algorithms, Radar signal processing, Signal detection, Radar sensor technology, Radar, Computer simulations, Spectrum analysis, Signal processing, Signal analyzers
The Antarctic ice sheet is an important part of the Earth system and plays a key role in the global climate system. The frequency modulated continuous wave (FMCW) radar can be used to obtain the changes of the transmitted signals at different layers inside the ice sheet, and then the information of the isochronous layers of the ice sheet can be extracted and the shallow accumulation rate can be deduced. In this paper, an improved spectrum estimation algorithm is proposed, which combines FFT (Fast Fourier Transform) and Chirp-Z (CZT transform, linear frequency modulation transform) to estimate the spectrum of the simulated radar system's difference frequency signals, effectively improving the radar detection accuracy, and verifying the effectiveness and rationality of the algorithm, so that the isochronous layers can be extracted on a larger spatial scale. In China's 36th Antarctic scientific expedition, FMCW radar was used to obtain the distribution of shallow isochronous layers in East Antarctica from Zhongshan Station to Taishan Station. In this paper, taking a typical area as an example, the algorithm was used to obtain the stratification and structure information of the ice sheet on a large-scale space, which provides important data support for the calculation of large-scale accumulation rate and flow history in the Antarctic region.
Because of the current situation that the Arctic field monitoring device drifts with the sea ice all year round and mainly relies on battery power supply, this paper proposes a control strategy for the Wind, light and sea current power supply system, which is the central power generation unit in the scenic sea current power supply system, using an improved adaptive variable-step maximum power tracking to ensure the tracking speed and steady-state accuracy; when the input power is redundant, the constant voltage control bus voltage is used to safeguard The two control methods and their switching processes are simulated using Matlab/Simulink for the photovoltaic power generation system at low temperature. The simulation verifies that the control strategy can make the photovoltaic power generation system under the sudden change of environmental conditions stable and controllable output.
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