Learn More
An image processing method for the calculation of waveguide invariant (<i>beta</i>) with passive sonar lofargram image is presented in this paper. Concise formula for calculating <i>beta</i> was then derived by finding the two-dimensional Fourier transform ridges of the lofargrarns. The algorithm was exercised for a Pekeris waveguide and a simulated shallow(More)
Relay enabled high speed wireless access, based on the IEEE 802.16j standard, is emerging as an attractive technology to realize the next generation broadband wireless metropolitan area networks. However, the link schedule associated with the traffic transmission, which has not specified and remained as an unsolved issue in such networks. In this respect,(More)
The IEEE 802.16m based broadband wireless access is a brand-new technology to provide high speed and wide range communications for wireless users. However, how to exploit the optimal utilization of the radio frequency bands resource in such networks is a big challenging issue as it covers the radio channel capacity optimization, channel bandwidth(More)
The IEEE 802.16m based broadband wireless access is a promising technology to provide high speed and wide coverage communications for wireless users. However, how to achieve the desired utilization of the radio frequency bandwidth resource in such networks is an open issue as it covers the radio channel capacity exploitation, channel transmission bandwidth(More)
A real-time sensor array self-calibration method is presented in this paper to reduce the ship-based flexible array element coordinates uncertainty in short baseline passive localization system. Six composite sensing elements are deployed to form the flexible array. Three of them emit direct spread spectrum DPSK pulse to measure the distance between six(More)
In the paper, to improve the signal detection performance in an oceanic reverberation environment, the algorithm based on whiten filter, beamforming, and mathematical morphology from image processing was presented as well as the parameters selection method of the detector. The result of an oceanic experimentation presents that the algorithm does improve the(More)
This paper presents the extension of the global description approach of a discontinuous function, which is proposed in the previous paper, to a spectral domain decomposition method. This multi-domain spectral immersed interface method(IIM) divides the whole computation domain into the smooth and discontinuous parts. Fewer points on the smooth domains are(More)
  • 1