公开(公告)号：US5021791A

公开(公告)日：1991-06-04

申请号：US809862

申请日：1985-10-31

申请人： David L. Hurd

发明人： David L. Hurd

IPC分类号： G01S13/26 ,  G01S13/522

CPC分类号： G01S13/26 ,  G01S13/522

摘要： A radar system comprises a radar carrier frequency oscillator for producing a radar carrier signal, a receiver including a mixer for producing Doppler signals, a Doppler filter bank and an alarm circuit, including a series of Doppler bins, having an alarm threshold level. The radar system is provided with a frequency modulator for modulating the radar carrier signal and any interference signal received by the receiver whereby the bandwidth of the frequency modulated interference signal exceeds the bandwidth of a number of Doppler filters in the Doppler filter bank. The alarm circuit may have two threshold levels and may be controlled in dependence upon a predetermined pattern of crossings of the threshold levels.

摘要翻译： 雷达系统包括用于产生雷达载波信号的雷达载波频率振荡器，包括用于产生多普勒信号的混频器的接收机，多普勒滤波器组和包括具有报警阈值电平的一系列多普勒频段的报警电路。 该雷达系统设置有用于调制雷达载波信号的频率调制器和由接收机接收的任何干扰信号，由此频率调制干扰信号的带宽超过多普勒滤波器组中多个多普勒滤波器的带宽。 警报电路可以具有两个阈值电平，并且可以根据阈值电平的预定交叉模式进行控制。

公开(公告)号：US5769065A

公开(公告)日：1998-06-23

申请号：US873228

申请日：1997-06-11

申请人： David L. Hurd

发明人： David L. Hurd

IPC分类号： F41B5/22 ,  F41B5/00

CPC分类号： F41B5/143

摘要： An arrow launching apparatus includes a bow attachment assembly and an arrow guide assembly. The front end of the arrow guide assembly is connected to the bow attachment assembly such that the arrow guide assembly is oriented perpendicularly with respect to the bow attachment assembly. The arrow guide assembly is adapted to receive an arrow for launching and includes a pair of longitudinally extensible and retractable front-end guide track assemblies located at the front end of the arrow guide assembly. Each of the front-end guide track assemblies includes a front telescopic segment and a rear telescopic segment. A plurality of spacer supports are connected to the front-end guide track assemblies and support the front-end guide track assemblies a predetermined distance from one another. A pair of transversely rotatable joint assemblies are provided. A first elastic resilient member is connected between the front telescopic segment and a front joint link for urging the front telescopic segment and the rear telescopic segment to a retracted orientation with respect to each other. A pair of transversely rotatable rear-end guide track assemblies are provided, wherein each rear-end guide track assembly is connected to a respective joint assembly. A bow string guide assembly is connected between the rear-end guide track assemblies at the rear end of the arrow guide assembly. The front joint link includes a stop portion located between the rear telescopic segment and a rear-end housing tube of a respective rear-end guide track assembly.

摘要翻译： 箭头发射装置包括弓形附接组件和箭头引导组件。 箭头引导组件的前端连接到弓形附接组件，使得箭头引导组件相对于弓形附接组件垂直定向。 箭头引导组件适于接收用于发射的箭头并且包括位于箭头引导组件的前端处的一对纵向可伸缩的前端导轨组件。 前端导轨组件中的每一个包括前伸缩段和后伸缩段。 多个间隔件支撑件连接到前端导轨组件并且将前端导轨组件彼此预定距离地支撑。 提供一对横向可旋转接头组件。 第一弹性弹性构件连接在前伸缩段和前接头连接件之间，用于将前伸缩段和后伸缩段推压到相对于彼此的缩回定向。 提供了一对横向可旋转的后端导轨组件，其中每个后端导轨组件连接到相应的接头组件。 弓弦引导组件连接在箭头导向组件后端的后端导轨组件之间。 前关节连杆包括位于后伸缩段和相应的后端导轨组件的后端收容管之间的停止部分。

公开(公告)号：US5520163A

公开(公告)日：1996-05-28

申请号：US351950

申请日：1994-12-08

申请人： David L. Hurd

发明人： David L. Hurd

IPC分类号： F41B5/22 ,  F41B5/00

CPC分类号： F41B5/143

摘要： A bow-attached, arrow launching apparatus, for launching a shorter-than-conventional-length arrow, includes a bow attachment assembly adapted to be attached perpendicularly to a bow and includes an extensible and retractable arrow guide assembly. The front end of the arrow guide assembly is connected to the bow attachment assembly such that the arrow guide assembly is oriented perpendicularly with respect to the bow attachment assembly. The rear end of the arrow guide assembly is adapted to contact a bow string. The arrow guide assembly is adapted to receive an arrow for launching from the arrow guide assembly. The arrow guide assembly includes a pair of extensible and retractable guide track assemblies. A plurality of spacer supports are connected to the guide track assemblies and support the guide track assemblies at least a predetermined distance from one another. A first spacer support is connected to the bow attachment assembly, and a bow string guide assembly is connected between the guide track assemblies at the rear end of the arrow guide assembly. The at least predetermined distance spaced between the guide track assemblies is less than the head width of the head portion of the arrow and is less than the tail width of the tail portion of the arrow. Each of the guide track assemblies includes a plurality of telescopic segments adapted to be arranged in either a retracted orientation or an extended orientation.

摘要翻译： 用于发射短于常规长度的箭头的弓形附接箭头发射装置包括弓形附接组件，其适于垂直于弓形附接并且包括可伸缩的箭头引导组件。 箭头引导组件的前端连接到弓形附接组件，使得箭头引导组件相对于弓形附接组件垂直定向。 箭头引导组件的后端适于接触弓弦。 箭头引导组件适于接收用于从箭头引导组件发射的箭头。 箭头导向组件包括一对可伸缩的导轨组件。 多个间隔件支撑件连接到导轨组件并且将导轨组件彼此至少预定距离地支撑。 第一间隔件支撑件连接到弓形附接组件，并且弓弦引导组件连接在箭头导向组件的后端处的导轨组件之间。 在导轨组件间隔开的至少预定距离小于箭头头部的头部宽度，并且小于箭头尾部的尾部宽度。 每个导轨组件包括多个伸缩段，其适于以缩回方向或延伸方向布置。

公开(公告)号：US4973968A

公开(公告)日：1990-11-27

申请号：US313502

申请日：1989-02-22

申请人： David L. Hurd

发明人： David L. Hurd

IPC分类号： G01S13/20 ,  G01S13/22 ,  G01S13/70

CPC分类号： G01S13/22 ,  G01S13/20 ,  G01S13/227 ,  G01S13/70 ,  G01S7/2927

摘要： A radar system for determining first time around targets from multiple time around targets using two radar pulse trains of different pulse repetition intervals and thresholding means. Echos from pulses at each pulse repetition interval being compared to determine first time around targets from subsequent time around targets. The radar system uses thresholding levels to determine an echo and is less prone to problems of coincidence gate clashing with high duty cycles.

摘要翻译： 一种雷达系统，用于使用具有不同脉冲重复间隔的两个雷达脉冲串和阈值装置来首先确定来自目标周围的目标的目标。 比较每个脉冲重复间隔的脉冲的回波，以确定围绕目标的后续时间的目标周围的第一次。 雷达系统使用阈值级别来确定回波，并且不太容易出现与高占空比的重合门冲突的问题。

公开(公告)号：US06679240B1

公开(公告)日：2004-01-20

申请号：US10288061

申请日：2002-11-05

申请人： David L. Hurd

发明人： David L. Hurd

IPC分类号： F41B500

CPC分类号： F41B5/1438 ,  F41B5/143

摘要： An arrow launching apparatus is provided for attachment to a bow handle and includes launcher-to-bow-handle attachment assembly connected to the bow handle. A launcher assembly is connected to the launcher-to-bow-handle attachment assembly. The launcher assembly includes a guide member assembly and a carriage block supported on the guide member assembly, and the carriage block rides along the guide member assembly. The carriage block includes a bow-string-reception channel for receiving a bow string. Carriage block hold and release assembly are supported on the guide member assembly and provide for selectively preventing or permitting travel of the carriage block along the guide member assembly. Use of the apparatus permits a user to use both hands when aiming and shooting an arrow. The apparatus also permits use of shorter-than-conventional-length arrows.

摘要翻译： 提供箭头发射装置用于附接到弓形手柄并且包括连接到弓形手柄的发射器到弓形手柄附接组件。 发射器组件连接到发射器到弓手柄附件组件。 发射器组件包括引导构件组件和支撑在引导构件组件上的滑块，并且滑架块沿着引导构件组件移动。 滑架块包括用于接收弓弦的弓弦接收通道。 托架块保持和释放组件被支撑在引导构件组件上并且提供用于选择性地防止或允许滑架块沿着引导构件组件的行进。 使用该装置允许用户在瞄准和射击箭头时使用双手。 该装置还允许使用短于常规长度的箭头。