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a mixed obstacle avoidance algorithm for intelligent vehicles to avoid dynamic obstacles is presented in uncertain environments. Traditional Vector Field Histogram method is combined with kalman prediction algorithm in this algorithm. The kalman predictor forecasts the optimal position estimation of dynamic obstacles at the next moment, then the intelligent(More)
Hunan Province has a complex terrain, the distribution of water resources is quite uneven, the feature of wet areas and arid areas is distinctly. Using the mesoscale numerical model WRF, a series of simulations and sensitivity experiments have been performed to simulate a heavy rain at beginning of November in 2008. It can be found from simulation results(More)
Multi-carrier HF radar is making full use of cleared band to achieve range high resolution. Due to randomness of high frequency silence band, the paper adopts a multicarrier phase-coded (MCPC) signal structure to restrain the waveform spectra. We deduced the echo expression of the random discontinuous spectra MCPC signal, and analyzed the signal performance(More)
In order to enhance HF radar angle resolution, and overcome target RCS scintillations, we adopt the transmitting and receiving antennas sparse deployment under bistatic pattern, the element intervals far less than range from the target to transmitters and receiver, the transmitters emit multi-carrier frequencies. In this paper, we apply CVX theory to solve(More)
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