利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

202 条记录 (耗时 0.012 秒)

    Ultra wideband radar employing synthesized short pulses
    32.
    发明公开
    Ultra wideband radar employing synthesized short pulses 失效
    超声波辐射雷达，克伦特，合成波尔森。

    公开(公告)号：EP0520666A1

    公开(公告)日：1992-12-30

    申请号：EP92305489.4

    申请日：1992-06-15

    申请人： Hughes Aircraft Company

    发明人： Tang, Raymond ,  Small, James G.

    IPC分类号： G01S13/24 ,  G01S13/10

    CPC分类号： G01S13/0209 ,  F41H11/12 ,  G01S13/106 ,  G01S13/24 ,  H04L27/2637 ,  H04L27/2653

    摘要： 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 (80) is coupled to a harmonic generator (111), and a power divider (62) distributes the output of the harmonic generator to a multiplicity of amplifiers (63). Each amplifier (63) has a phase-locked VCO circuit (114) that provides frequency accuracy, spectral purity, low noise and frequency stability. Thus, each amplifier (63) provides one of the spectral components of the predetermined radar pulse train. The amplifiers (63) are coupled to a multiplexing feed (88, 100) that illuminates a reflector (122). On receive, the multiplexing feed (88, 100) separates the spectral components of the incoming pulse train. Each spectral component is coupled to its own narrow band receiver (131), and one receiver is used to amplify and detect each spectral component. The signals from the receivers (131) are coherently combined in a signal processor (132) in which the signals add coherently and the noise signals do not. The output of the signal processor (132) may be applied to a radar display (133). 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 (80) may be frequency modulated by a modulator (145) to provide communications. It may also be used as a covert IFF system to identify friendly aircraft using IFF code generator (147). 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, using adaptive scanning circuitry (149). It is hard to jam because the receiver array is in sensitive to noise at frequencies out side the narrow bandwidths of the individual receivers and also to noise which is not coherent across the multiplicity of receiver channels.

    摘要翻译： 一种脉冲雷达，通过发送其各个频谱分量在空间中形成预定的雷达脉冲串。 因此，在不以高速率接通和关闭射频信号的情况下获得极短脉冲序列。 振荡器（80）耦合到谐波发生器（111），功率分配器（62）将谐波发生器的输出分配到多个放大器（63）。 每个放大器（63）具有提供频率精度，频谱纯度，低噪声和频率稳定性的锁相VCO电路（114）。 因此，每个放大器（63）提供预定的雷达脉冲序列的频谱分量之一。 放大器（63）耦合到照亮反射器（122）的复用馈送（88,100）。 在接收时，复用馈送（88,100）分离输入脉冲串的频谱分量。 每个频谱分量耦合到其自己的窄带接收机（131），一个接收机用于放大和检测每个频谱分量。 来自接收器（131）的信号被相干地组合在信号处理器（132）中，其中信号相加地增加，噪声信号不加。 信号处理器（132）的输出可以应用于雷达显示器（133）。 由雷达产生的短脉冲提供非常高的分辨率，并且可以通过扫描目标来对准目标，从而对其进行成像。 雷达以低功率发射宽带信号; 信号难以检测和拦截，从而提供拦截雷达的概率很低。 雷达可以用作微波链路，其中振荡器（80）可以由调制器（145）进行频率调制以提供通信。 它也可以用作隐蔽的IFF系统来识别使用IFF码发生器的友好飞机（147）。 雷达提供穿透沙子的信号，可用于映射和定位埋在沙中的地雷。 也可以通过引爆来清除地雷。 当电源开启时，雷达提供定向能量束。 雷达可以执行自适应干扰，并且也是使用自适应扫描电路的抗干扰雷达（149）。 难以阻塞，因为接收器阵列对于各个接收机的窄带宽的频率处的噪声敏感，以及对于多个接收机信道不相干的噪声。

    Spread-spectrum communication system
    33.
    发明公开
    Spread-spectrum communication system 失效
    Spreizspektrumskommunikationssystem。

    公开(公告)号：EP0446024A2

    公开(公告)日：1991-09-11

    申请号：EP91301834.7

    申请日：1991-03-05

    申请人： CANON KABUSHIKI KAISHA

    发明人： Kato, Ichiro

    IPC分类号： H04B1/66 ,  H04L5/06 ,  H04K3/00

    CPC分类号： H04L27/2653 ,  H04B1/69 ,  H04L27/2637

    摘要： In order to eliminate the need for spread-spectrum code synchronization, a code divided into a suitable number of digits is applied to a transmitter and a receiver. The transmitter multiplies an original signal by each subdivision of the code to produce n-number of new baseband signals. Carrier waves having n-types of frequencies are modulated by these signals and the modulated signals are added to obtain an ultra-wide band signal, which is then transmitted to the receiver. The receiver separates the received signal into the narrow band components which prevailed prior to the adding operation in the transmitter, and then demodulates each component into a baseband signal. Each of these demodulated signals is multiplied by a code the same as that on the transmitting side, whereby n-number of original signals are obtained. Original signals obtained from a signal spread by a code different from that of the receiver are not n in number. Thus, spread-spectrum communication can be realized without requiring spread-spectrum code synchronization.

    摘要翻译： 为了消除对扩频码同步的需要，分配到合适数量的数字的码被应用于发射机和接收机。 发射机通过码的每个细分乘以原始信号以产生n个新的基带信号。 具有n种频率的载波由这些信号调制，并且调制的信号被相加以获得超宽带信号，然后发送到接收机。 接收机将接收到的信号分离成在发射机中相加操作之前占据的窄带分量，然后将每个分量解调为基带信号。 这些解调信号中的每一个乘以与发送侧相同的代码，从而获得n个原始信号。 从与接收机不同的码扩展的信号获得的原始信号的数目不是n个。 因此，可以在不需要扩频码同步的情况下实现扩频通信。

    IMPROVEMENT OF RECEIVING SPREAD SPECTRUM SIGNALS
    37.
    发明公开
    IMPROVEMENT OF RECEIVING SPREAD SPECTRUM SIGNALS 审中-公开
    接收扩频信号的改进

    公开(公告)号：EP3282287A1

    公开(公告)日：2018-02-14

    申请号：EP16183797.6

    申请日：2016-08-11

    申请人： Airbus Defence and Space GmbH

    发明人： Floch, Jean-Jacques ,  Soualle, Francis

    IPC分类号： G01S19/36 ,  G01S19/30 ,  G01S19/22

    CPC分类号： H04L27/2278 ,  G01S19/01 ,  G01S19/30 ,  G06F17/15 ,  H04B1/692 ,  H04B1/707 ,  H04B2001/6904 ,  H04B2001/6908 ,  H04B2001/6912 ,  H04B2001/70706 ,  H04L27/2637

    摘要： The invention relates to a receiver for spread spectrum signals comprising a first part for preprocessing and digitizing a received spread spectrum signal, and a second part (20) for tracking the digitized received spread spectrum signal and comprising a carrier loop (200, 202, 214, 216, 218) and a code loop (200, 202, 204, 206, 208, 210, 212), wherein the code loop comprises a generator (210) for a reference receiver signal for correlation with the received spread spectrum signal and the code loop is configured to modify the reference receiver signal in order to shape a correlation function between the received spread spectrum signal and the reference receiver signal, wherein the first part is adapted for multiplying the received spread spectrum signal with a first analogue spectral offsetting signal provided for down-converting the received spread spectrum signal to an intermediate frequency IF 0 and a sub-carrier frequency f m selected from a set of M sub-carrier frequencies such that the received spread spectrum signal is down-converted and spectrally offset in the analogue domain during a time interval covering L m chips wherein L m chips comprises at least one chip of a spreading code of the received spread spectrum signal,.

    摘要翻译： 本发明涉及一种用于扩频信号的接收机，它包括用于对接收的扩频信号进行预处理和数字化的第一部分和用于跟踪数字化的接收扩频信号的第二部分（20），并包括载波环路（200,202,214 ，其中所述代码循环包括用于参考接收器信号的发生器（210），所述参考接收器信号用于与所接收的扩频信号相关，并且所述发射器（210） 代码循环被配置为修改参考接收机信号以便形成接收的扩频信号和参考接收机信号之间的相关函数，其中第一部分适于将接收到的扩频信号与提供的第一模拟频谱偏移信号相乘 用于将接收的扩频信号下变频到中频IF0和从一组M个副载波频率中选择的副载波频率fm， 接收的扩频信号在覆盖Lm个码片的时间间隔期间在模拟域中被下变频和频谱偏移，其中Lm个码片包括接收的扩频信号的扩展码的至少一个码片。