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公开(公告)号：US4846571A
公开(公告)日：1989-07-11
申请号：US929572
申请日：1986-11-03
CPC分类号： G01S17/325 , G01S7/4917 , G01S7/499 , G01S7/4814
摘要： A laser is provided for generating a beam of continuous wave (CW) electromagnetic energy having a nominal frequency and amplitude. The frequency of the CW beam is modulated (FM) from the nominal frequency. The amplitude of the frequency modulated beam is modulated (AM) from the nominal amplitude to produce an amplitude and frequency modulated continuous wave (AM-FM CW) beam of energy. A local oscillator beam is produced from the frequency modulated CW beam. The AM-FM CW beam is directed for reflection by a target. The target-reflected return portions of the AM-FM CW beam are combined with the frequency modulated local oscillator beam to produce a beat frequency signal which is subsequently detected, the beat frequency signal having a frequency component representative of the range of the target. Such arrangement, when implemented in a radar system, provides such radar system with accurate target range measurements unambiguous over large ranges. Further, such AM-FM CW signal provides high resolution between target-reflected return signals of such AM-FM CW signal and returns from near-field atmospheric clutter.
摘要翻译： 提供激光器用于产生具有标称频率和幅度的连续波（CW）电磁能量束。 CW波束的频率从标称频率调制（FM）。 频率调制波束的幅度从标称幅度调制（AM），以产生幅度和频率调制的连续波（AM-FM CW）能量束。 从调频CW波束产生本地振荡器波束。 AM-FM CW光束被指向用于目标的反射。 将AM-FM CW波束的目标反射返回部分与调频本地振荡器波束组合以产生随后检测到的拍频信号，拍频信号具有代表目标范围的频率分量。 这种布置在雷达系统中实现时，可以在大范围内为这种雷达系统提供准确的目标范围测量。 此外，这种AM-FM CW信号在这样的AM-FM CW信号的目标反射返回信号和从近场大气杂波返回之间提供高分辨率。
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公开(公告)号：US4812035A
公开(公告)日：1989-03-14
申请号：US929686
申请日：1986-11-03
CPC分类号： G01S17/36 , G01S17/325 , G01S7/4917 , H01S3/139
摘要： A laser radar system wherein a beam of continuous wave (CW) electromagnetic energy is generated with frequency modulation (FM) and amplitude modulation (AM) being imposed thereon to produce an amplitude and frequency modulated, continuous wave beam of energy. The AM-FM CW beam is transmitted toward a selected target, portions of the transmitted beam being reflected by the target and received along with portions of the transmitted beam reflected by unselected targets and atmospheric clutter. A first signal is produced in response to the frequency modulation on the received beam portions reflected by the selected target, such first signal representing the approximate range of the selected target and substantially resolving the selected target from unselected targets and atmospheric clutter and having a relatively long ambiguous range interval. A second signal is produced in response to the amplitude modulation on the received beam portions reflected by the selected target, the second signal representing the accurate range of the selected target within a relatively short ambiguous range interval. The second signal provides poor resolution between the selected target and the unselected targets and atmospheric clutter. The first and second signals are combined to produce an output signal having the relatively high resolution and long ambiguous range interval of the first signal and providing the accurate selected target range measurement of the second signal.
摘要翻译： 一种激光雷达系统，其中通过频率调制（FM）和幅度调制（AM）产生连续波（CW）电磁能量束，以产生幅度和频率调制的连续波束。 AM-FM CW波束朝向所选择的目标发送，所发送的波束的部分被目标物反射并且被未被选择的目标物和大气杂波反射的部分发射光束一起接收。 响应于由所选择的目标反射的接收波束部分上的频率调制产生第一信号，该第一信号表示所选择的目标的近似范围，并且从未选择的目标和大气杂波基本上解决所选择的目标并且具有相对长的 模糊范围间隔。 响应于由所选择的目标反射的接收波束部分上的幅度调制产生第二信号，第二信号表示在相对较短的不明确的范围间隔内所选择的目标的精确范围。 第二个信号在所选择的目标和未选择的目标和大气杂波之间提供差的分辨率。 第一和第二信号被组合以产生具有第一信号的相对高分辨率和长的不明确的范围间隔的输出信号，并且提供第二信号的精确选择的目标范围测量。
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公开(公告)号：US5262787A
公开(公告)日：1993-11-16
申请号：US19323
申请日：1993-02-10
申请人： William J. Wilson , David G. Armstrong , Roy E. Byington , Nathan Freedman , Neil F. Lacey , Fritz A. Gross
发明人： William J. Wilson , David G. Armstrong , Roy E. Byington , Nathan Freedman , Neil F. Lacey , Fritz A. Gross
CPC分类号： H03F3/60 , G01S7/4052 , G01S2007/4091 , H03F2200/198
摘要： A radar performance monitor (RPM) receives a transmitted radar signal from a radar system being monitored and couples the signal to a recirculating loop comprising a SAW delay line in order to produce a series of simulated radar return signals of equal amplitude and by using the same frequency as the received radar signal providing the frequency falls within a predetermined bandwidth of the SAW delay line. The simulated radar return signals are displayed at the radar system and used to evaluate the operation and calibration of a transmitter and the sensitivity and calibration of a transmitter and the sensitivity and calibration of a receiver in the radar system. The radar performance monitor is actuated at the option of a radar operator.
摘要翻译： 雷达性能监视器（RPM）从被监视的雷达系统接收发射的雷达信号，并将信号耦合到包括SAW延迟线的循环回路，以便产生一系列相等振幅的模拟雷达返回信号，并使用相同的 提供频率的接收雷达信号的频率落在SAW延迟线的预定带宽内。 模拟的雷达返回信号显示在雷达系统，用于评估发射机的操作和校准以及发射机的灵敏度和校准以及雷达系统中接收机的灵敏度和校准。 雷达性能监视器可以由雷达操作员选择启动。
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公开(公告)号：US4167737A
公开(公告)日：1979-09-11
申请号：US868107
申请日：1978-01-09
申请人： Nathan Freedman
发明人： Nathan Freedman
CPC分类号： G01S13/288
摘要： A code generation and receiving system for a large bandwidth Doppler tolerant signal for use by communication and radar systems includes a set of delay lines for producing discrete phase shifts on a carrier signal. One delay line with relatively large delays between taps thereon produces a set of quadratic phase shifts approximating a frequency sweep. A second delay line with relatively small delays between taps thereon produces a binary phase code.
摘要翻译： 用于由通信和雷达系统使用的大带宽多普勒容限信号的代码生成和接收系统包括用于在载波信号上产生离散相移的一组延迟线。 在其上的抽头之间具有较大延迟的一个延迟线产生近似于频率扫描的一组二次相移。 在其上的抽头之间具有相对小的延迟的第二延迟线产生二进制相位代码。
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公开(公告)号：US3931622A
公开(公告)日：1976-01-06
申请号：US362717
申请日：1973-05-22
申请人： Nathan Freedman
发明人： Nathan Freedman
CPC分类号： G01S13/765
摘要： A voice-modulated transponder system comprising an interrogator and a light-weight transponder. In the described embodiment, the interrogator is airborne and the transponder is located on the ground. The interrogator can locate the position of the transponder and simultaneously therewith two-way voice communication between the interrogator and transponder is possible.
摘要翻译： 一种语音调制的应答器系统，包括询问器和轻量级应答器。 在所描述的实施例中，询问器是机载的，并且应答器位于地面上。 询问器可以定位应答器的位置，同时可以在询问器和应答器之间进行双向语音通信。
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