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    Moving range gate generating system for radar apparatus
    21.
    发明授权
    Moving range gate generating system for radar apparatus 失效

    公开(公告)号：US3781885A

    公开(公告)日：1973-12-25

    申请号：US3781885D

    申请日：1965-01-13

    Applicant: US AIR FORCE

    Inventor： HASSENCAHL L

    IPC: G01S13/70 ,  G01S7/28

    CPC classification number: G01S13/70

    Abstract: 1. In a radar system for searching and tracking objects in space, a voltage comparator circuit comprising: a source of serially generated time base pulses having a predetermined pulse repetition frequency, bias means coupled to said pulse source and controlled by said pulses for deriving a control voltage extended over a predetermined duration, a first sawtooth generator biased by said control voltage to produce for said predetermined duration a sawtooth voltage encompassing a period greater in length than a plurality of periods of said pulse repetition frequency, a second sawtooth generator, multivibrator means normally having a first quiescent state and one output level and being switchable to a second state and another output level by each of said pulses, said second sawtooth generator being controlled by said multivibrator means, an input connection between said source and said multivibrator means whereby in response to the switching of said multivibrator means from said first to said second state said second sawtooth generator produces a second sawtooth voltage, a comparator having first and second input electrodes and an output electrode and characteristics of producing an output pulse on said output electrode each time the signals simultaneously applied to said input electrodes agree in amplitude, cathode follower means for applying said first sawtooth voltage to the first input electrode of said comparator, circuit means for applying said second sawtooth voltage to the second input electrode of said comparator, means connected between said output electrode and said multivibrator means for restoring the initial quiescent state of said multivibrator means upon the occurrence of said output pulses, whereby said second sawtooth voltage undergoes termination upon each reversal of said multivibrator means from said second state to said first quiescent state, the improvement lying in gradually increasing the delay between each of said output pulses and the related one of said time base pulses which spatially precedes it.

    Short range monopulse marine search radar for small object detection
    22.
    发明授权
    Short range monopulse marine search radar for small object detection 失效
    短距离海上搜索雷达用于小物体检测

    公开(公告)号：US3778827A

    公开(公告)日：1973-12-11

    申请号：US3778827D

    申请日：1972-01-27

    Applicant: SPERRY RAND CORP

    Inventor： STRENGLEIN H

    IPC: G01S13/18 ,  G01S13/44 ,  G01S13/70 ,  G01S9/16 ,  G01S9/22

    CPC classification number: G01S13/70 ,  G01S13/18 ,  G01S13/4445

    Abstract: The subject invention comprises a short range monopulse marine search radar for detecting small targets such as channel markers in the water. The radar has its antenna directed so that its monopulse null intersects the surface of the water at an initial minimum range proximate the radar over which sea clutter is below the boresight line. This initial range is investigated by very narrow transmitted rf pulses to determine the presence of targets therein. The antenna is subsequently controlled in elevation by a signal coupled through a balanced modulator to the antenna so that the intersection of the monopulse null and the water surface is positioned at successive increased ranges which are investigated by the very narrow transmitted pulses. At each successive range, the geometry provided by the position of the radar antenna and the position of the monopulse null-water surface interface is such that sea clutter is below the boresight line and each successive range segment is increased exponentially by a range gate. When the range gate and the elevation monopulse both interpret the same time as corresponding to the time interval between the firing of the transmitter and the time corresponding to the range to the surface of the water, aboveboresight targets in the range segment preceding this interface are interpreted as being other than sea clutter and are displayed on a display device.

    Abstract translation: 本发明包括一种短距离单脉冲海洋搜索雷达，用于检测水中的通道标记等小目标。 该雷达的天线指向，使得其单脉冲无效值与雷达的初始最小范围相交，在该海面上的海杂波低于视轴。 通过非常窄的发射rf脉冲来研究该初始范围以确定其中的目标的存在。 天线随后通过平衡调制器耦合到天线的信号在高程中进行控制，使得单脉冲零点和水面的交点位于由非常窄的发射脉冲研究的连续增加的范围内。 在每个连续的范围内，由雷达天线的位置提供的几何形状和单脉冲无水面接口的位置使得海杂波低于视轴，每个连续的范围段由范围门指数增加。 当范围门和高程单脉冲都解释与发射机起火之间的时间间隔与对应于水面的范围的时间相对应的相同时间时，在该接口之前的范围段内的视轴目标 被解释为不是海杂波并且被显示在显示装置上。

    Surveillance doppler radars
    23.
    发明授权
    Surveillance doppler radars 失效
    监视雷达雷达

    公开(公告)号：US3717874A

    公开(公告)日：1973-02-20

    申请号：US3717874D

    申请日：1971-09-08

    Applicant: INT STANDARD ELECTRIC CORP

    Inventor： BARRIERE G ,  DALBERA M

    IPC: G01S13/44 ,  G01S13/66 ,  G01S13/70 ,  G01S13/91 ,  G01S3/14 ,  G01S9/22

    CPC classification number: G01S13/4445 ,  G01S13/66 ,  G01S13/70 ,  G01S13/913

    Abstract: This invention relates to a monopulse coherent doppler radar system for use at the end of a runway for detecting moving targets on the runway and vicinity of said runway. A multiplicity of range gates and threshold circuits define contiguous range increments on the runway. When a target is detected, a light signal indicates the proper range increment.

    Abstract translation: 本发明涉及一种在跑道末端使用的单脉冲相干多普勒雷达系统，用于检测跑道和跑道附近的移动目标。 多个范围门和阈值电路在跑道上定义连续的范围增量。 当检测到目标时，光信号指示适当的范围增量。

    Glideslope position detection system for use with an independent aircraft landing monitor
    24.
    发明授权
    Glideslope position detection system for use with an independent aircraft landing monitor 失效
    用于独立飞机着陆监控的GLIDESLOPE位置检测系统

    公开(公告)号：US3716855A

    公开(公告)日：1973-02-13

    申请号：US3716855D

    申请日：1970-07-15

    Applicant: TEXAS INSTRUMENTS INC

    Inventor： ASAM E

    IPC: G01S7/292 ,  G01S13/70 ,  G01S13/87 ,  G01S13/91 ,  G01S9/16 ,  H01Q15/14

    CPC classification number: G01S13/913 ,  G01S7/2921 ,  G01S13/70 ,  G01S13/876

    Abstract: An glideslope position detection system wherein a pair of passive reflectors are located in a spaced apart configuration at a known position adjacent an airport runway. Each of the reflectors are shaped to direct different reflection patterns in response to radar signals transmitted from an aircraft during a glideslope approach to the runway. One of the reflectors directs a reflection pattern beneath the glideslope and the other of the reflectors directs a radar reflection pattern above the glideslope, the reflection patterns providing equal amplitude radar returns to an aircraft traveling along the glideslope. The aircraft carries a radar system for detecting the relative radar return signal amplitudes from the two reflectors. Circuitry is responsive to comparison of the radar return signal amplitudes from the reflectors to generate indications of the position of the aircraft relative to the runway glideslope.

    Abstract translation: 一种滑坡位置检测系统，其中一对被动反射器位于与机场跑道相邻的已知位置处的间隔开的构型。 每个反射器被成形为响应于在滑翔道接近跑道期间从飞机发射的雷达信号来引导不同的反射图案。 反射器中的一个将反射图案引导到下滑道下方，另一个反射器将雷达反射图案引导到滑坡之上，提供等幅度雷达的反射图案返回到沿着滑翔机行进的飞机。 该飞机载有用于检测两个反射器的相对雷达返回信号幅度的雷达系统。 电路响应于来自反射器的雷达返回信号幅度的比较，以产生飞行器相对于跑道滑坡的位置的指示。

    Digital range measuring system
    25.
    发明授权
    Digital range measuring system 失效
    数字范围测量系统

    公开(公告)号：US3666367A

    公开(公告)日：1972-05-30

    申请号：US3666367D

    申请日：1970-06-01

    Applicant: HUGHES AIRCRAFT CO

    Inventor： FARNSWORTH ROBERT P ,  WYETH RICHARD W

    IPC: G01S13/66 ,  G01S13/70 ,  G01C3/08

    CPC classification number: G01S13/70 ,  G01S13/66

    Abstract: COMPLEMENT VALUE. ANOTHER COUNTER CIRCUIT COUNTS UNSECCESSFUL TRANSMISSION AND RECEPTION (RANGING) PERIODS AND AFTER A REDETERMINED NUMBER OF CONSECUTIVE SUCH PERIODS THE SYSTEM SWITCHED FROM THE TRACK OF THE ACQUISITION MODE.

    A DIGITAL SYSTEM FOR MEASURING THE RANGE OF A REMOTE OBJECT IN RESPONSE TO LASER ENERGY REFLECTED FROM THE OBJECT AND FOR CONTROLLING THE MODE OF OPERATION. WHEN LOGIC CIRCUITS DETERMINE THAT A SIGNAL IS A VALID RETURN SIGNAL (I.E. NOT NOISE ENERGY) THE SYSTEM SWITCHES TO A TRACK MODE OF OPERATION WHEREIN IT RESPONDS ONLY TO SIGNALS CONCIDENT WITH A RELATIVELY NARROW TRACKING GATE. IF THE RETURN SIGNAL SHOULD FADE (DETECHABLE SIGNAL NOT RECEIVED) A COUNTER, WHICH STORES THE DIGITAL COMPLEMENT OF THE RANGE INFORMATION AND WHICH POSITIONS THE TRACKING GATE, IS AUTOMATICALLY RECYCLED TO THE LAST STORED RANGE

    Antiglint radio direction finder
    26.
    发明授权
    Antiglint radio direction finder 失效
    反射无线电导向探测器

    公开(公告)号：US3618008A

    公开(公告)日：1971-11-02

    申请号：US3618008D

    申请日：1969-12-15

    Applicant: MOTOROLA INC

    Inventor： KERN NEIL C

    IPC: G01S13/44 ,  G01S13/70 ,  G01S13/86 ,  G01S9/02 ,  G01S9/14

    CPC classification number: G01S13/70 ,  G01S13/4427 ,  G01S13/86

    Abstract: In radio direction finders of the type in which the direction of propogation of a pulse reflected from a target is indicated, errors occur due to glint. The glint is due to the fact that all reflective parts of the target are not at the same distance from the direction finder whereby the several radio echoes reflected from the same target arrive at the direction finder at different times and are vectorially added in the direction finder, causing incorrect indication of the direction to the target by the direction finder. The various errors of direction, due to glint, measured by direction finders is averaged out by applying a variable range gate to the waves received by the direction finder, whereby angle reflection measurements from various parts of the target are averaged out to give a true indication of direction of the target.

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