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    • 1. 发明授权
    • Coherent laser radar system and target measurement method
    • 相干激光雷达系统和目标测量方法
    • US06469778B2
    • 2002-10-22
    • US09758421
    • 2001-01-12
    • Kimio AsakaYoshihito HiranoTakayuki YanagisawaShusou WadakaYasuisa OogaEtsuo Sugimoto
    • Kimio AsakaYoshihito HiranoTakayuki YanagisawaShusou WadakaYasuisa OogaEtsuo Sugimoto
    • G01P336
    • G01S7/4818G01S7/486G01S17/10
    • A coherent laser radar system includes a pulsed laser oscillating a pulsed laser beam which is split into two parts by an optical divider. A first part of the two is transmitted as a transmitted beam via a beam splitter. A second part is supplied to a delay line via a coupling optics and others to be delayed by a predetermined time as a local beam, and is incident onto an optical coupler. The received beam from the target is incident onto the optical coupler via a scanning optics and so on. A photodetector carries out the coherent detection of the light beam coupled by the optical coupler. A signal processor computes a target velocity and the like from a signal generated by the detection and converted into a digital signal by an A/D converter. This makes it possible to solve a problem of a conventional system in that the system configuration is complicated and expensive.
    • 相干激光雷达系统包括脉冲激光振荡脉冲激光束,该激光束通过光学分配器分成两部分。 两者的第一部分通过分束器作为透射光束传输。 第二部分经由耦合光学器件提供给延迟线,而其它部分被延迟预定时间作为局部光束,并入射到光耦合器上。 来自目标的接收光束通过扫描光学器件等入射到光耦合器上。 光电检测器执行由光耦合器耦合的光束的相干检测。 信号处理器从由检测产生的信号中计算出目标速度等并由A / D转换器转换成数字信号。 这使得可以解决常规系统的问题,因为系统配置是复杂和昂贵的。
    • 2. 发明授权
    • Coherent laser radar apparatus and radar/optical communication system
    • 相干激光雷达仪器和雷达/光通信系统
    • US06580497B1
    • 2003-06-17
    • US09579462
    • 2000-05-26
    • Kimio AsakaYoshihito HiranoShusou Wadaka
    • Kimio AsakaYoshihito HiranoShusou Wadaka
    • G01S1710
    • G01S17/32G01S7/481G01S7/4917G01S7/493G01S17/50G01S17/95Y02A90/19
    • In a coherent CW laser radar apparatus, a soft target such as rain, fog, and air turbulence can be detected by using a CW laser. The coherent CW laser radar apparatus is arbandd by comprising: as an optical component, a CW laser oscillating a laser radiation having a single wavelength; a dividing means for dividing laser radiation derived from the CW laser; an optical modulator for modulating one of the laser radiation divided by the dividing means; an optical antenna for projecting the modulated laser radiation as transmitted radiation toward a target, and also for receiving scattered radiation from the target as received radiation; combining means for combining the other of the laser radiation divided by the dividing means as local radiation with the received radiation received from the optical antenna; and a photodetector for optical-heterodyne-detecting the combined radiation. Also, this coherent CW laser radar apparatus is further arbandd by employing: as an electric component, a pseudo-random modulation signal generator for supplying a pseudo-random modulation signal to the optical modulator; a variable delay device for time-delaying a portion of the pseudo-random modulation signal generated from the pseudo-random modulation signal generator; a correlating device for multiplying the output signal of the photodetector by the pseudo-random modulation signal time-delayed by the variable delay device; and signal processing means for acquiring physical information such as a distance of the target and a velocity of the target based upon a intensity and a frequency of the output signal from the correlating device, and also the delay time set by the variable delay device. In this radar apparatus, an optical path between the optical components is constituted by an optical fiber.
    • 在相干CW激光雷达装置中,可以通过使用CW激光器来检测诸如雨,雾和空气湍流的软目标。 相干CW激光雷达装置包括:作为光学部件,CW激光器振荡具有单个波长的激光辐射; 用于分割源自CW激光器的激光辐射的分割装置; 光调制器,用于调制由分割装置分割的激光辐射之一; 用于将经调制的激光辐射作为传输辐射朝向目标投影的光学天线,并且还用于接收来自目标的散射辐射作为接收辐射; 组合装置,用于将由分割装置分割的另一个激光辐射作为局部辐射与从光学天线接收的接收辐射组合; 以及用于光学外差检测组合辐射的光电检测器。 另外,该相干CW激光雷达装置还通过采用:作为电气部件的伪随机调制信号发生器,用于向光调制器提供伪随机调制信号; 一种可变延迟装置,用于对由伪随机调制信号发生器产生的伪随机调制信号的一部分进行时间延迟; 相关装置,用于将光电检测器的输出信号乘以由可变延迟装置延时的伪随机调制信号; 以及信号处理装置,用于基于来自相关装置的输出信号的强度和频率以及由可变延迟装置设置的延迟时间,获取诸如目标的距离和目标的速度的物理信息。 在该雷达装置中,光学部件之间的光路由光纤构成。
    • 3. 发明授权
    • Radar system and coherent integrating method thereof
    • 雷达系统及其相干积分法
    • US06335701B1
    • 2002-01-01
    • US09649842
    • 2000-08-28
    • Takahiko FujisakaKimio AsakaYoshihito HiranoShusou Wadaka
    • Takahiko FujisakaKimio AsakaYoshihito HiranoShusou Wadaka
    • G01S1353
    • G01S7/288G01S13/532
    • Disclosed is a radar system capable of obviating a problem that a sufficient improvement of an S/N ratio could not be obtained in the prior art, and comprising a transmitter/receiver for detecting a phase of a receiving signal reflected from an observation target, an A/D converter for converting the receiving signal into a digital signal, a range gate for extracting the receiving signal having a time corresponding to the predetermined pulse width, a data dividing unit for dividing the receiving signals in to two groups of data, an FFT unit for fast-Fourier-transforming one group of data of the two groups of data, an FFT unit for fast-Fourier-transforming the other group of data, a complex conjugating unit for taking a complex conjugate of an output of the FFT unit, a complex multiplying unit for performing a complex multiplication for the every same Doppler frequency component with respect to an output of the former FFT unit and an output of the complex conjugating unit, and a complex adder for executing a coherent addition of a result of the complex multiplication the same number of times as the repetitions with respect to the same Doppler frequency component. The receiving signals can be coherently integrated both in the pulse and between the pulses, and the S/N ratio can be improved.
    • 公开了一种能够消除在现有技术中无法获得S / N比的充分改善的问题的雷达系统,并且包括用于检测从观测目标反射的接收信号的相位的发射机/接收机, 用于将接收信号转换为数字信号的A / D转换器,用于提取具有与预定脉冲宽度相对应的时间的接收信号的量程门,用于将接收信号分成两组数据的数据分割单元,FFT 用于对两组数据的一组数据进行快速傅立叶变换的单元,用于对另一组数据进行快速傅立叶变换的FFT单元,用于获取FFT单元的输出的复共轭的复共轭单元, 复数乘法单元,用于相对于前一FFT单元的输出和复共轭单元的输出执行针对每个相同的多普勒频率分量的复乘法,以及复共轭 加法器,用于执行复数乘法结果的相干相加相同于相同多普勒频率分量的重复次数。 接收信号可以在脉冲和脉冲之间相干地集成,并且可以提高S / N比。
    • 5. 发明授权
    • Apparatus for detecting turbulent layer
    • 用于检测湍流层的装置
    • US06505508B1
    • 2003-01-14
    • US09831739
    • 2001-05-14
    • Shumpei KameyamaYoshihito HiranoShusou WadakaHidetoshi TanakaWakasa Kise
    • Shumpei KameyamaYoshihito HiranoShusou WadakaHidetoshi TanakaWakasa Kise
    • G01M900
    • G01S13/95G01S13/953G01S15/885G01S17/95G01W2001/003Y02A90/18Y02A90/19
    • A turbulent layer detecting apparatus in accordance with the present invention is equipped with a transmitting section that transmits beams of electromagnetic waves, sound waves or light waves into the atmosphere, a receiving section that receives the electromagnetic waves, the sound waves, or the light waves that have been transmitted by the transmitting section and scattered by particulates or the like in the atmosphere, a wind velocity measuring section that measures a beam direction component of a wind velocity at two or more observation points on a beam from a received signal received by the receiving section, or a density measuring section that measures a density at two or more observation points on the beam, and a turbulent layer detecting section that detects the presence of a turbulent layer on the basis of the output of either the wind velocity measuring section or the density measuring section.
    • 根据本发明的湍流层检测装置配备有将电磁波,声波或光波发射到大气中的发送部,接收电磁波,声波或光波的接收部 已经由发射部分传播并被大气中的微粒等传播的风速测量部分,用于测量来自接收到的信号的波束上的两个或更多个观察点处的风速的波束方向分量 接收部分或测量光束上两个或更多个观察点处的密度的浓度测量部分,以及湍流层检测部分,其基于风速测量部分或风速测量部分的输出来检测湍流层的存在, 密度测量部分。
    • 10. 发明授权
    • Inspection apparatus
    • 检验仪器
    • US5272923A
    • 1993-12-28
    • US691063
    • 1991-04-23
    • Shusou WadakaTsutomu NagatsukaKoichiro MisuMitsuhiro Koike
    • Shusou WadakaTsutomu NagatsukaKoichiro MisuMitsuhiro Koike
    • G01N29/11G01N29/34G01N29/40G01N29/42G01N29/46G01N29/50G01N29/22
    • G01N29/42G01N29/11G01N29/341G01N29/40G01N29/46G01N29/50G01N2291/044
    • An inspection apparatus utilizing a pulse compression technique is described which comprises a signal generator, a transmission/reception probe; first and second correlators and an adder. The signal generator generates a composite transmission signal consisting of signals Sap(t), Saq(t), Sbp(t) and Sbq(t) respectively based on a basic unit signal ga(t) and a sequence {p}, the signal ga(t) and a sequence {q}, a basic unit signal gb(t) and the sequence {p}, and the signal gb(t) and the sequence {q}, to the probe to transmit the composite transmission signal to a target. The first correlator performs a correlation operation of echo signals Rap(t), Raq(t), Rbp(t) and Rbq(t) corresponding to the signal Sap(t), Saq(t) and Sbq(t) by utilizing reference signals Ua(t) and Ub(t) based on the sequences to provide results Caap(t), Caaq(t), Cbbp(t) and Cbbq(t). The second correlator performs a correlation operation of the results Caap(t), Caaq(t) Cbbp(t) and Cbbq(t) by utilizing the sequences {p} and {q} to provide compressed pulses Caapp(t), Caaqq(t), Cbbpp(t) and Cbbqq(t). These pulses are summed up at the adder to provide a composite compressed pulse C having the large amplitude main lobe and small amplitude side lobes.
    • 描述了利用脉冲压缩技术的检查装置,其包括信号发生器,发送/接收探头, 第一和第二相关器和加法器。 信号发生器基于基本单位信号ga(t)和序列{p}分别产生由信号Sap(t),Saq(t),Sbp(t)和Sbq(t)组成的复合传输信号, ga(t)和序列{q},基本单位信号gb(t)和序列{p}以及信号gb(t)和序列{q}到探头以将复合传输信号发送到 一个目标。 第一相关器通过利用参考信号对与信号Sap(t),Saq(t)和Sbq(t)相对应的回波信号Rap(t),Raq(t),Rbp(t)和Rbq(t)进行相关运算 基于序列提供信号Ua(t)和Ub(t),以提供结果Caap(t),Caaq(t),Cbbp(t)和Cbbq(t)。 第二相关器通过利用序列{p}和{q}来执行结果Caap(t),Caaq(t)Cbbp(t)和Cbbq(t)的相关运算,以提供压缩脉冲Caapp(t),Caaqq t),Cbbpp(t)和Cbbqq(t)。 这些脉冲在加法器处相加,以提供具有大振幅主瓣和小振幅旁瓣的复合压缩脉冲C.