公开(公告)号：US5223838A

公开(公告)日：1993-06-29

申请号：US864733

申请日：1992-04-07

申请人： Raymond Tang ,  Kuan M. Lee ,  Ruey-shi Chu ,  Gordon L. Howard

发明人： Raymond Tang ,  Kuan M. Lee ,  Ruey-shi Chu ,  Gordon L. Howard

IPC分类号： G01S7/28

CPC分类号： G01S7/28

摘要： An apparatus and a method for enhancing the radar cross section of a target. The present invention is an impulse radar system that implements a method that comprises the following steps. A pilot impulse radar pulse is transmitted at a target. The pilot pulse comprises a plurality of individual pulses having respective distinct frequencies generated by the impulse radar system. A return pulse from the target is received by the impulse radar system and provides information indicative of target scattering centers. The return pulse is used as a calibration signal for generating a phase conjugated pulse. The phase conjugated pulse is then transmitted at the target. Processing a target return signal derived from the transmitted phase conjugated pulse enhances the radar cross section of the target because the waveform of the transmitted phase conjugated pulse is matched to the characteristics of the target. The present invention is adapted to detect low radar cross section targets without encountering the problems and frequency restrictions with conventional radar systems. In a second embodiment of the present invention, when a progressive phase variation is applied to the transmit pulses, the radar cross section contributed by backward travelling wave is made to add in phase in the received direction by processing the received target return pulses while adaptively adjusting the phase sequence of the transmitted pulses. When the appropriate phase sequence is achieved which is such that the transmitted pulses match the scattering centers on the target, then an enhanced return signal is received.

摘要翻译： 一种用于增强目标雷达横截面的装置和方法。 本发明是一种实现包括以下步骤的方法的脉冲雷达系统。 在目标位置传输一个导频脉冲雷达脉冲。 导频脉冲包括具有由脉冲雷达系统产生的各自不同频率的多个独立脉冲。 来自目标的返回脉冲由脉冲雷达系统接收并提供指示目标散射中心的信息。 返回脉冲用作生成相位共轭脉冲的校准信号。 相位共轭脉冲随后在目标传输。 由于传输相位共轭脉冲的波形与目标的特性相匹配，处理从传输相位共轭脉冲得到的目标返回信号增强了目标的雷达横截面。 本发明适用于检测低雷达截面目标，而不会遇到常规雷达系统的问题和频率限制。 在本发明的第二实施例中，当对发射脉冲施加逐行相位变化时，通过在自适应调整的同时处理接收到的目标返回脉冲，使由反向行波贡献的雷达横截面在接收方向上相位相加 发射脉冲的相序。 当实现适当的相序使发射的脉冲与目标上的散射中心匹配时，接收增强的返回信号。

公开(公告)号：US4302015A

公开(公告)日：1981-11-24

申请号：US114754

申请日：1980-01-24

申请人： Dale A. Bowser ,  Gordon L. Howard

发明人： Dale A. Bowser ,  Gordon L. Howard

IPC分类号： A63F3/00

CPC分类号： A63F3/00

摘要： A game comprising of a game board in combination with playing cards and playing tokens and wherein the game board is inscribed with a plurality of contiguous or adjacent squares with each square having an individual and distinctive number imprinted thereon, and corresponding numbers being provided for the individual playing cards. The numbers inscribed on the game board are preferably arranged in such a manner that the number of least numerical value is disposed at the central portion of the game board, and the numbers increase in value toward the outer periphery of the game board. Each player is provided with a prescribed number of playing cards, face down, and the remaining cards are placed together in a pack. The players in turn place the playing tokens on selected squares of the game board in accordance with the numbers of the playing cards held, and the object of the game is to place a particular plurality of your own tokens in a line on the game board while blocking the opponents from similarly placing their tokens on the game board.

摘要翻译： 一种游戏，包括与扑克牌和游戏标记组合的游戏板，并且其中游戏板上刻有多个邻接的或相邻的正方形，每个正方形具有印在其上的个体和特征号，并且为个人提供相应的数字 扑克牌 优选地，游戏板上刻有的数字以最小数值的数量设置在游戏板的中央部分，并且数字向游戏板的外周增加。 每个玩家被提供规定数量的扑克牌，面朝下，剩下的牌被放在一起。 玩家依次按照持有的扑克牌的数量，在游戏板的选定的方格上放置游戏标记，游戏对象是将特定的多个自己的令牌放置在游戏板的一行中，而 阻止对手在游戏板上放置标记。