Conventional Synthetic Aperture Radar (SAR) systems cannot obtain high-resolution and wide-swath illumination area due to the well-known minimum antenna area constraint. Single Phase Center MultiBeam (SPCMB) technique...Conventional Synthetic Aperture Radar (SAR) systems cannot obtain high-resolution and wide-swath illumination area due to the well-known minimum antenna area constraint. Single Phase Center MultiBeam (SPCMB) technique can overcome this limitation by adding spatial sampling through multiple receivers in azimuth direction. Unfortunately, this approach will lead to an increase of azimuth ambiguities (interbeam ambiguities), because each receive beam’s mainlobe overlaps with the other ones’ sidelobes. This paper proves that the front part of SPCMB SAR systems can be considered to be a hybrid filterbank. Therefore, the azimuth signal can be reconstructed and the interbeam am- biguities can be effectively suppressed by a well-designed hybrid filterbank.展开更多
IP的语音传输(Voice over Internet Protocol,VoIP)技术是一种基于网络的语音技术,它可以将语音信号转换成数据流,并在互联网上传输。VoIP技术与Call Center的融合使用户在通话时能更加方便、快捷地使用互联网,节省时间和费用,实现语音...IP的语音传输(Voice over Internet Protocol,VoIP)技术是一种基于网络的语音技术,它可以将语音信号转换成数据流,并在互联网上传输。VoIP技术与Call Center的融合使用户在通话时能更加方便、快捷地使用互联网,节省时间和费用,实现语音信号与数据流的同时传输,提高通话质量和效率。同时,技术融合可以解决传统呼叫中心面临的一些挑战,如服务质量下降、成本上升等问题。展开更多
文摘Conventional Synthetic Aperture Radar (SAR) systems cannot obtain high-resolution and wide-swath illumination area due to the well-known minimum antenna area constraint. Single Phase Center MultiBeam (SPCMB) technique can overcome this limitation by adding spatial sampling through multiple receivers in azimuth direction. Unfortunately, this approach will lead to an increase of azimuth ambiguities (interbeam ambiguities), because each receive beam’s mainlobe overlaps with the other ones’ sidelobes. This paper proves that the front part of SPCMB SAR systems can be considered to be a hybrid filterbank. Therefore, the azimuth signal can be reconstructed and the interbeam am- biguities can be effectively suppressed by a well-designed hybrid filterbank.
文摘IP的语音传输(Voice over Internet Protocol,VoIP)技术是一种基于网络的语音技术,它可以将语音信号转换成数据流,并在互联网上传输。VoIP技术与Call Center的融合使用户在通话时能更加方便、快捷地使用互联网,节省时间和费用,实现语音信号与数据流的同时传输,提高通话质量和效率。同时,技术融合可以解决传统呼叫中心面临的一些挑战,如服务质量下降、成本上升等问题。
