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    • 12. 发明授权
    • Wireless communication system with high efficiency/high power optical source
    • 具有高效/高功率光源的无线通信系统
    • US07257327B2
    • 2007-08-14
    • US10231651
    • 2002-08-30
    • James G. Small
    • James G. Small
    • H04B10/00
    • H04B10/1125H01J23/165H01J23/213H01J23/22H01J25/50
    • An optical communication system is provided which includes an optical signal transmitter which communicates high bandwidth, high power frequencies. The optical signal transmitter includes a high efficiency/high power optical source such as an optical magnetron or a phased array source of electromagnetic radiation, and a modulator element. The modulator element may be within a resonance cavity of the high efficiency/high power optical source (intra cavity) or external to the cavity (extra cavity). The modulator element serves to modulate output radiation of the high efficiency/high power optical source to produce a modulated high frequency optical signal which may be transmitted through the air. The optical signal transmitter is particularly useful in providing the last mile connection between cable service operators and end users.
    • 提供一种光通信系统,其包括通信高带宽,高功率频率的光信号发射机。 光信号发射机包括诸如光磁控管或相控阵电磁辐射源的高效/高功率光源和调制器元件。 调制器元件可以在高效/高功率光源(腔内)或空腔外部(额外空腔)的谐振腔内。 调制器元件用于调制高效/高功率光源的输出辐射,以产生可以通过空气传输的调制的高频光信号。 光信号发射机在提供电缆业务运营商和终端用户之间的最后一英里连接方面特别有用。
    • 13. 发明授权
    • Coherent detection of ultra wideband waveforms
    • 超宽带波形的相干检测
    • US07081850B2
    • 2006-07-25
    • US10860268
    • 2004-06-03
    • James G. Small
    • James G. Small
    • G01S7/28
    • G01S7/285G01S7/024G01S7/282G01S13/0209G01S2007/2886
    • A general purpose system and method for transmitting and coherently detecting UWB waveforms is predicated on the formation of conjugate pair of UWB waveforms. The in-phase and conjugate quadrature waveforms are orthogonal to each other and have the same power spectrum so that when squared and added they sum to the modulation envelope of the waveforms. By defining the waveform pair in this manner, a relatively simple and inexpensive transceiver can be used to transmit and receive the waveforms and yet preserve maximum range resolution and recover all possible energy in the returned waveforms. The transceiver transmits the in-phase UWB waveform and the conjugate quadrature UWB waveform with either a known time delay or orthogonal polarization relation. The time delay may be varied to suppress aliased return signals. A general purpose receiver detects the return waveforms, aligns them and then processes the waveforms using conventional techniques to extract target information including amplitude, phase, motion, imaging, etc. The transmission and detection of the conjugate waveforms is easily incorporated into a phased array system that comprises a plurality of transceivers.
    • 用于发送和相干检测UWB波形的通用系统和方法基于UWB波形的共轭对的形成。 同相和共轭正交波形彼此正交并且具有相同的功率谱,使得当平方和相加时,它们与波形的调制包络相加。 通过以这种方式定义波形对,可以使用相对简单和便宜的收发器来发送和接收波形,并且保持最大范围分辨率并恢复返回波形中的所有可能的能量。 收发器以已知的时间延迟或正交极化关系发送同相UWB波形和共轭正交UWB波形。 可以改变时间延迟以抑制混叠返回信号。 通用接收器检测返回波形,对齐它们,然后使用常规技术处理波形,以提取包括幅度,相位,运动,成像等的目标信息。共轭波形的传输和检测容易地并入相控阵列系统 其包括多个收发器。
    • 14. 发明授权
    • Optical magnetron for high efficiency production of optical radiation
    • 光磁控管用于高效率生产光学辐射
    • US06538386B2
    • 2003-03-25
    • US10050744
    • 2002-01-16
    • James G. Small
    • James G. Small
    • H01J2550
    • H01J23/165H01J23/213H01J23/22H01J25/50
    • An optical magnetron is provided which includes a cylindrical cathode having a radius rc, and an annular-shaped anode having a radius ra and coaxially aligned with the cathode to define an anode-cathode space having a width wa=ra−rc. The optical magnetron further includes electrical contacts for applying a dc voltage between the anode and the cathode and establishing an electric field across the anode-cathode space, and at least one magnet arranged to provide a dc magnetic field within the anode-cathode space generally normal to the electric field. A plurality of resonant cavities are provided with each having an opening along a surface of the anode which defines the anode-cathode space. Electrons emitted from the cathode are influenced by the electric and magnetic fields to follow a path through the anode-cathode space and pass in close proximity to the openings of the resonant cavities to create a resonant field in the resonant cavities. The resonant cavities are each designed to resonate at a frequency having a wavelength &lgr;, and circumference 2&pgr; ra of the surface of the anode is greater than &lgr;.
    • 提供一种光磁控管,其包括具有半径rc的圆柱形阴极和具有半径r并与阴极同轴对准的环形阳极,以限定具有宽度wa = ra-rc的阳极 - 阴极空间。 光磁控管还包括用于在阳极和阴极之间施加直流电压并且在阳极 - 阴极空间之间建立电场的电触点,以及布置成在阳极 - 阴极空间内提供大致正常的直流磁场的至少一个磁体 到电场。 设置多个谐振腔,每个谐振腔具有沿阳极​​表面的开口,其限定阳极 - 阴极空间。 从阴极发射的电子受到电场和磁场的影响,沿着穿过阳极 - 阴极空间的路径并且靠近谐振腔的开口传递,以在谐振腔中产生谐振场。 谐振腔被设计为在具有波长lambd的频率处谐振,并且阳极表面的周长2pi ra大于lambd。
    • 15. 发明授权
    • Sparse frequency waveform radar system and method
    • 稀疏频率波形雷达系统及方法
    • US06486827B2
    • 2002-11-26
    • US09837679
    • 2001-04-18
    • James G. Small
    • James G. Small
    • G01S7282
    • G01S7/36G01S7/28G01S13/106G01S13/24
    • A radar for locating and tracking objects based on the use of a pulsed waveform, each pulse of the pulsed waveform being made up of a plurality of spectral components having different frequencies, including an antenna. The radar further includes a transmitter operatively coupled to the antenna for generating the plurality of spectral components that make up each pulse of the pulsed waveform and a receiver operatively coupled to the antenna for receiving signals at the frequencies of the plurality of spectral components. The radar also includes a signal processor operatively coupled to the receiver for processing the received signals in order to generate and output a radar presentation and to detect the presence of other signals at particular frequencies, a display operatively coupled to the signal processor for displaying the radar presentation, and finally a controller operatively coupled to the transmitter and the signal processor for varying the frequencies at which the plurality of spectral components are generated, such that the transmitter generates spectral components at frequencies different from the frequencies of other signals detected by the signal processor.
    • 基于使用脉冲波形来定位和跟踪物体的雷达,脉冲波形的每个脉冲由具有不同频率的多个频谱分量组成,包括天线。 雷达还包括可操作地耦合到天线的发射机,用于产生组成脉冲波形的每个脉冲的多个频谱分量,以及可操作地耦合到天线的接收机,用于接收多个频谱分量的频率处的信号。 雷达还包括可操作地耦合到接收器的信号处理器,用于处理所接收的信号,以便产生和输出雷达显示并且检测特定频率处的其它信号的存在,操作地耦合到信号处理器的显示器的显示器 呈现,最后是可操作地耦合到发射机和信号处理器的控制器,用于改变生成多个频谱分量的频率,使得发射机产生频率分量,其频率不同于由信号处理器检测到的其它信号的频率 。
    • 17. 发明授权
    • Ultra wideband radar employing synthesized short pulses
    • 超声波雷达使用合成短脉冲
    • US5239309A
    • 1993-08-24
    • US722769
    • 1991-06-27
    • Raymond TangJames G. Small
    • Raymond TangJames G. Small
    • F41H11/12G01S13/02G01S13/10G01S13/24H04L27/26
    • G01S13/0209F41H11/12G01S13/106G01S13/24H04L27/2637H04L27/2653
    • An impulse radar that forms a predetermined radar pulse train in space by transmitting individual spectral components thereof. Thus, a train of extremely short pulses is obtained without switching a radio frequency signal on and off at a high rate. An oscillator is coupled to a harmonic generator, and a power divider distributes the output of the harmonic generator to a multiplicity of amplifiers. Each amplifier has a phase-locked VCO circuit that provides frequency accuracy, spectral purity, low noise and frequency stability. Thus, each amplifier provides one of the spectral components of the predetermined radar pulse train. The amplifiers are coupled to a multiplexing feed that illuminates a reflector. On receive, the multiplexing feed separates the spectral components of the incoming pulse train. Each spectral component is coupled to its own narrow band receiver, and one receiver is used to amplify and detect each spectral component. The signals from the receivers are coherently combined in a signal processor in which the signals add coherently and the noise signals do not. The output of the signal processor may be applied to a radar display. The short pulses produced by the radar provide very high resolution, and can map a target by sweeping across it, thus imaging it. The radar emits a wideband signal at a low power level; the signal is difficult to detect and intercept, and thus provides for a low probability of intercept radar. The radar may be used as a microwave link, wherein the oscillator may be frequency modulated to provide communications. It may also be used as a covert IFF system to identify friendly aircraft. The radar provides signals that penetrate sand and may be used for mapping and to locate land mines buried in the sand. It may also be used for clearing away land mines by detonating them. When the power is turned up, the radar provides for a directed energy beam. The radar may perform adaptive jamming, and is also a jam resistant radar. It is hard to jam because the receiver array is insensitive to noise at frequencies outside the narrow bandwidths of the individual receivers and also to noise which is not coherent across the multiplicity of receiver channels.
    • 19. 发明授权
    • Magnetron anode design for short wavelength operation
    • 磁控管阳极设计为短波长工作
    • US07265360B2
    • 2007-09-04
    • US10982591
    • 2004-11-05
    • C. Vincent BakerJames G. Small
    • C. Vincent BakerJames G. Small
    • G01J1/42H01J25/55
    • H01J23/02H01J25/56
    • An electromagnetic radiation source is disclosed. The electromagnetic radiation source includes an anode having a first conductor, a second conductor positioned relative to the first conductor, a plurality of pole pieces coupled to at least one of the first conductor and the second, and at least one mechanical phase reversal positioned along the first conductor or second conductor. Adjacent pole pieces are separated by a gap. The electromagnetic radiation source also includes a cathode separated from the anode by an anode-cathode space, electrical contacts for applying a dc voltage between the anode and the cathode and establishing an electric field across the anode-cathode space, and at least one magnet arranged to provide a dc magnetic field within the anode-cathode space generally normal to the electric field. Electrons emitted from the cathode are influenced by the electric and magnetic fields to follow a path through the anode-cathode space and pass in close proximity to the plurality of pole pieces, and the gaps between adjacent pole pieces provide fringing fields which interact with the electrons to produce single mode operation at a desired operating frequency.
    • 公开了电磁辐射源。 电磁辐射源包括具有第一导体的阳极,相对于第一导体定位的第二导体,耦合到第一导体和第二导体中的至少一个的多个极片以及沿着第一导体定位的至少一个机械相反转 第一导体或第二导体。 相邻的极片被间隙隔开。 电磁辐射源还包括通过阳极 - 阴极空间从阳极分离的阴极,用于在阳极和阴极之间施加直流电压并在阳极 - 阴极空间之间建立电场的电触点,以及布置成 以在通常垂直于电场的阳极 - 阴极空间内提供直流磁场。 从阴极发射的电子受到电场和磁场的影响,沿着通过阳极 - 阴极空间的路径并且靠近多个极片并且相邻极片之间的间隙提供与电子相互作用的边缘场 以在期望的工作频率下进行单模操作。
    • 20. 发明授权
    • Optical magnetron for high efficiency production of optical radiation, and 1/2&lgr; induced pi-mode operation
    • 用于高效率生产光学辐射的光磁控管和1 / 2lambd诱导的π模式操作
    • US06504303B2
    • 2003-01-07
    • US09798623
    • 2001-03-01
    • James G. Small
    • James G. Small
    • H01J2550
    • H01J23/165H01J23/213H01J23/22H01J25/50
    • An optical magnetron is provided which includes a cylindrical cathode and an annular-shaped anode coaxially aligned with the cathode. The anode may include a plurality of wedges arranged side by side to form a hollow-shaped cylinder having the anode-cathode space located therein, and each of the wedges includes a recess which defines at least in part a resonant cavity having an opening exposed to the anode-cathode space. The anode alternatively may include a plurality of washer-shaped layers stacked atop each other. Each of the layers includes a plurality of recesses along an inner diameter which are aligned with recesses of the other layers to define a plurality of resonant cavities along an axis of the cylinder each having an opening to the anode-cathode space.
    • 提供了一种光磁控管,其包括圆柱形阴极和与阴极同轴对准的环形阳极。 阳极可以包括并排布置的多个楔形件,以形成具有位于其中的阳极 - 阴极空间的中空形圆柱体,并且每个楔形件包括至少部分地限定具有暴露于 阳极 - 阴极空间。 阳极可以包括彼此堆叠的多个垫圈形层。 每个层包括沿着内径的多个凹部,其与其它层的凹部对准,以沿着圆柱体的轴线限定多个谐振腔,每个具有到阳极 - 阴极空间的开口。