For increasing the cross-track resolution, the multiple input multiple output （MIMO） technique is introduced into the swath bathymetry system and a new swath bathymetry approach using MIMO sonar is proposed. The MIM...For increasing the cross-track resolution, the multiple input multiple output （MIMO） technique is introduced into the swath bathymetry system and a new swath bathymetry approach using MIMO sonar is proposed. The MIMO sonar is composed of two parallel transmitting uniform linear arrays （ULAs） and a receiving ULA which is perpendicular to the former. The spacing between the two transmitting ULAs is equal to the product of the receiving sensor number and the receiving inter-sensor spacing. Furthermore, two narrowband linear frequency modulation （LFM） pulses, sharing the same frequency band but with opposite modulation slopes, are used as transmitting waveforms of the two transmitting ULAs. With such an array layout and transmitting signals, the MIMO sonar can sound a swath with the cross-track resolution doubling that of the traditional multibeam sonar using a Mills cross array. Numerical examples are provided to verify the effectiveness of the proposed approach.展开更多
The Gas Hydrate Stability Thickness(GHST)map along the margins of India was prepared from available bathymetry,sea bottom temperature and geothermal gradient.Since the Bottom Simulating Reflector(BSR)is often associat...The Gas Hydrate Stability Thickness(GHST)map along the margins of India was prepared from available bathymetry,sea bottom temperature and geothermal gradient.Since the Bottom Simulating Reflector(BSR)is often associated with the base of the gas hydrate stability zone,the map helps to identify BSR in case of any doubt for its detection. The map is also useful to the explorer by setting a depth window within which proxies for gas展开更多
基金supported by the National Natural Science Foundation of China(11104222)the Doctorate Foundation of Northwestern Polytechnical University(CX201101)
文摘For increasing the cross-track resolution, the multiple input multiple output （MIMO） technique is introduced into the swath bathymetry system and a new swath bathymetry approach using MIMO sonar is proposed. The MIMO sonar is composed of two parallel transmitting uniform linear arrays （ULAs） and a receiving ULA which is perpendicular to the former. The spacing between the two transmitting ULAs is equal to the product of the receiving sensor number and the receiving inter-sensor spacing. Furthermore, two narrowband linear frequency modulation （LFM） pulses, sharing the same frequency band but with opposite modulation slopes, are used as transmitting waveforms of the two transmitting ULAs. With such an array layout and transmitting signals, the MIMO sonar can sound a swath with the cross-track resolution doubling that of the traditional multibeam sonar using a Mills cross array. Numerical examples are provided to verify the effectiveness of the proposed approach.
文摘The Gas Hydrate Stability Thickness(GHST)map along the margins of India was prepared from available bathymetry,sea bottom temperature and geothermal gradient.Since the Bottom Simulating Reflector(BSR)is often associated with the base of the gas hydrate stability zone,the map helps to identify BSR in case of any doubt for its detection. The map is also useful to the explorer by setting a depth window within which proxies for gas
