会员体验
专利管家（专利管理）
工作空间（专利管理）
风险监控（情报监控）
数据分析（专利分析）
侵权分析（诉讼无效）
联系我们
交流群
官方交流：
QQ群： 891211   
微信请扫码    >>>
现在联系顾问~
下载
著录项
PDF全文
热词
    • 80. 发明专利
      GB1028339A Improvements relating to pulse radar equipment 未知
    • Improvements relating to pulse radar equipment
    • GB1028339A
    • 1966-05-04
    • GB260463
    • 1963-01-21
    • ASS ELECT IND
    • G01S13/30 , G01S13/52 , G01S13/524 , G01S13/534 , H04Q3/42
    • 1,028,339. Doppler radar. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Jan. 21, 1963 [Jan. 23, 1962], No. 2604/63. Heading H4D. A Doppler radar comprises means transmitting a plurality of pulse trains at different carrier frequencies and pulse spacings, means comparing, at each carrier frequency, the phase difference between the carrier waves of successive echo pulses with the phase difference between the carrier waves of the corresponding transmitted pulses, means producing a pulse signal if the comparison yields a phase difference above a predetermined amount, and means combining the pulse signals resulting from a plurality of comparisons to produce a resultant pulse signal. The use of a plurality of carrier frequencies and a plurality of pulse spacings makes it much less likely that errors due to record echoes or objects differing in distance by an amount corresponding to a pulse spacing will occur in more than one of the comparison signals, with the result that the resultant signal is largely error free. In the arrangement shown the pulse trains are in the form of trains of pulse pairs A1 and A2, Fig. 1 (a) (not shown), separated by an interval S, the resulting echoes from a single target being P1 and P2. The echoes are received and passed to four discriminators, Fig. 2 (not shown), (four carrier frequencies being used) wherein the frequencies are separated out and the resulting pulses processed. For each pulse train the transmitted pulse pairs are also passed to the discriminator, where they are passed to a phase difference measuring means, Fig. 4, both directly, and through a delay means 1, delaying the pulse pair by an interval S, such that the phase of the carrier wave of the trailing pulse A2 is compared with that of the delayed leading pulse A 1 1 , Figs. 1(a) and 1(b) (not shown). A signal representing the measured phase difference is fed to a store. The echo pulse pairs P1 and P2 are likewise passed to the phase difference measuring means, directly and indirectly. The signal representing the phase difference between the carrier waves of the trailing echo pulse P2 and the delayed leading echo pulse P 1 1 , is compared in comparison means with the stored signal and a difference signal is passed via a diode D 3 and threshold means to one input of an AND gate 2. The echo pulse pair is also passed, directly and delayed, to the inputs of an AND gate 1. The AND gate 1 therefore only gives an output at time t 2 , Fig. 1, when pulse P2 coincides with pulse P 1 1 . The output from the AND gate 1 is fed to the AND gate 2 and since it coincides with the output from the comparison means, the AND gate 2 gives an output. This output is fed to an adder circuit, Fig. 2, via a delay means such that the outputs from all the discriminators arrive at the adder simultaneously. The adder circuit is arranged to only pass on a final output pulse if outputs are received simultaneously from more than a predetermined number of discriminators. The arrangement of the pulse trains is preferably as shown in Fig. 3 (not shown). The pulse spacing in at least one of the trains is preferably variable from pulse to pulse.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
每页展示10个专利
每页展示10个专利
每页展示20个专利
每页展示50个专利
每页展示100个专利

IPRDB

最新中国发明专利 最新美国发明专利 技术领域 专利库 专利分类库 国际专利分类库

热门服务

会员版试用 API 数据接口 找代理 知嘟嘟专利交易 排行榜 大学排行榜 专利百科

关于我们

平台介绍 战略合作 网站地图

友情链接

知嘟嘟专利交易 国家知识产权局 中国商标网

联系方式


©2019-2023 上海吉码数字技术有限公司 版权所有，并保留所有权利 沪ICP备20016256号-6 沪公网安备31011702005475号