公开(公告)号：WO1990005438A1

公开(公告)日：1990-05-17

申请号：PCT/US1989003942

申请日：1989-09-14

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  KLAYMAN, Arnold, I.

IPC: H04S01/00

CPC classification number: H04S1/002 ,  H04S7/30 ,  H04S7/307

Abstract: In a stereo system having sum and difference signals that are processed for stereo image enhancement, apparent directivity of the stereo sound is increased by the use of servo systems (40, 44) for the left and right processed difference signals (L - R)p, (R - L)p. Each of the left and right servos (40, 44) responds to the respective left or right stereo input signal (Lin, Rin) and amplifies increases in the respective left or right processed difference signals. The amount of amplification is controlled by feeding back the amplified or directivity enhanced difference signal (L - R)pe, (R - L)pe, first comparing it with the processed difference signal (L - R)p, (R - L)p before directivity enhancement, and then combining it with the input signal (Lin, Rin) in a preselected ratio so as to control the amount of amplification of the processed difference signal that is provided for directivity enhancement.

公开(公告)号：WO1990004562A2

公开(公告)日：1990-05-03

申请号：PCT/US1989003875

申请日：1989-09-11

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  LECOMPTE, George, W.

IPC: B65H55/04

CPC classification number: G02B6/04 ,  B65H55/04 ,  B65H2515/12 ,  C07F7/0803 ,  G02B6/4457

Abstract: Method and apparatus for making a filament winding amenable to inside payout and having squared-off ends providing optimal volumetric efficiency. The filament crossovers are distributed so as to reduce crossover stacking in one or a few places which can interfere with winding and payout from the finished winding. A base wire layer (48) is wrapped onto a mandrel (30) over which a guide (52) is nestingly wound with adjacent guide wire turns spaced apart. The filament first layer is wound nesting in the guide wire, spaces (54), and subsequent filament layers (56) accordingly formed. Each crossing filament turn has an advance in a crossing region substantially aligned with a crossover region in the underlying layer and which in one embodiment is one-half the winding pitch.

Abstract translation: 用于制造长丝缠绕的方法和装置，其适用于内部支付并具有方形端部，从而提供最佳容积效率。 灯丝交叉分布，以减少一个或几个位置的交叉堆叠，这可能会干扰绕组和从完成的绕组发出的支出。 基线层（48）被卷绕到心轴（30）上，引导件（52）以相互间隔开的相邻引导线圈嵌套地缠绕在该心轴上。 灯丝第一层被缠绕嵌套在导丝中，相应地形成空间（54）和随后的细丝层（56）。 每个交叉的灯丝匝在与下层中的交叉区域基本对准的交叉区域中具有前进，并且在一个实施例中为绕组间距的一半。

公开(公告)号：WO1990003675A1

公开(公告)日：1990-04-05

申请号：PCT/US1989003211

申请日：1989-07-28

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  ROBUSTO, Paul, F. ,  SCOFIELD, David, D. ,  WANG, Chan, Huan ,  HAMACHER, John, C.

IPC: H01S03/08

CPC classification number: H01S3/08063 ,  H01S3/0315

Abstract: A method for restricting the mode of operation of long wavelength waveguide lasers by introducing an approximate step function into the reflectivity of circular optical elements (19) used in such lasers. The preferred method is to grind off a portion of the optical coating (20) of the optical element (19) leaving a circular unground region (26) of high reflectivity having a diameter (D) of approximately 60 % of the laser bore width (b) bounded by a ground region (28) of lower reflectivity. The method permits simple, inexpensive field modification of existing lasers.

公开(公告)号：WO1990003457A1

公开(公告)日：1990-04-05

申请号：PCT/US1989003265

申请日：1989-07-31

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  ROTHSCHILD, Bill, F. ,  TROUP, Sue

IPC: C25D05/38

CPC classification number: C23C18/1844 ,  C23C18/1692 ,  C23C18/1848 ,  C25D5/38

Abstract: A method for application of an adherent nickel plate to titanium includes steps of surface preparation, deposition of nickel from a plating solution, and a final treatment. The surface preparation steps include a hydrochloric acid dip, a nitric acid/hydrofluoric acid activation, treatment to slow the re-formation of an oxide layer, and deposition of a nickel strike. The treatment to reduce oxide formation may be accomplished without application of a current, in a solution of acetic and hydrofluoric acid, in which titanium alloy has been electrolytically dissolved. Alternatively, the treatment may be performed with the piece to be plated made anodic in a solution of acetic acid and hydrofluoric acid.

公开(公告)号：WO1990003049A1

公开(公告)日：1990-03-22

申请号：PCT/US1989003325

申请日：1989-08-03

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  LEE, Jar, Jueh ,  YEN, Huan-Wun

IPC: H01Q03/26

CPC classification number: H01Q3/2676

Abstract: A wideband, true time delay antenna beam-forming network (10) for millimeter wave phased array antennas is disclosed herein. The beam-forming network (10) of the present invention includes a laser (30) for generating a beam B of electromagnetic energy. The beam-forming network (10) further includes an electro-optic modulator (40) for modulating the beam B in response to an input signal S modulated about a first frequency fo. A first antenna array (80) generates a first electromagnetic field pattern P by radiating the modulated beam B' in a first direction. The present invention further includes a constrained lens (90) for receiving the first field pattern P and for emitting an antenna driver feed beam F in a second direction in response thereto. An antenna array driver (115) electro-magnetically coupled to the constrained lens (90) by the feed beam F provides a set of signals modulated about the first frequency fo to drive an antenna array (20).

公开(公告)号：WO1990001836A1

公开(公告)日：1990-02-22

申请号：PCT/US1989002662

申请日：1989-06-19

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  LARSON, Lawrence, E.

IPC: H03M03/02

CPC classification number: H03M3/388 ,  H03M3/464 ,  H03M3/502

Abstract: A digital correction circuit for use in signal converters is disclosed. The invention includes a subtractor (32) for subtracting a digital correction signal from an input signal, a digital filter (34) for filtering the output of the subtractor to provide a digital output signal and memory (39) for providing said correction signal. In a specific embodiment of the invention, an improved analog-to-digital converter is disclosed including an improved digital-to-analog converter with digital correction circuitry.

公开(公告)号：WO1990001706A2

公开(公告)日：1990-02-22

申请号：PCT/US1989002877

申请日：1989-07-03

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  LO, THomas, K. ,  SACKS, Jack, M. ,  BANH, Nam, D.

IPC: G01S03/786

CPC classification number: G01S3/7865 ,  G06T7/254

Abstract: A method and apparatus are disclosed for detecting moving objects silhouetted against background clutter. A correlation subsystem (12) is used to register the background of a current image frame (framestore 1) with an image frame taken two time periods earlier (framestore 3). A first difference image is generated by subtracting the registered images, with the first difference image being filtered by low pass filter (34) and thresholded by a three level segmenter (36). A second difference image is likewise generated between the current image frame and another image frame taken at a different subsequent time period. This second difference image is likewise filtered and thresholded. The two difference images are logically ANDed together by gate (39) whose output is connected to a formatter, sorter and feature extractor (40). Track files are generated in CPU (16) for comparing subsequently extracted image features with previously stored extracted features.

Abstract translation: 已经开发了用于检测具有与寄生背景回波相关的限定轮廓的移动物体的方法和设备。 使用相关子系统（12）来记录当前图像（图像存储器1）的背景与两个较早时间段（图像存储器3）拍摄的图像。 通过减去所记录的图像来创建第一差异图像，第一差异图像由低通滤波器（34）滤波并且其由三级分割器（36）设置的阈值。 在当前图像和在不同的较晚时间段拍摄的另一图像之间以相同方式创建第二差异图像。 我们以相同的方式过滤并设置第二个差异图像的阈值。 两个差分图像通过与门（39）在逻辑上组合，其输出连接到格式器，分类器和特征提取器（40）。 在CPU（16）中创建跟踪文件，以将随后提取的图像的特征与先前存储的提取的特征进行比较。

公开(公告)号：WO1989012905A1

公开(公告)日：1989-12-28

申请号：PCT/US1989001906

申请日：1989-05-08

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  SCHUMACHER, Robert, W.

IPC: H01J17/06

CPC classification number: H01J17/066 ,  H01J17/44

Abstract: A plasma switch employs a cold cathode which yields secondary electrons to sustain a plasma within the switch. The cathode is provided with a series of perturbations which increase the effective cathode surface area exposed to the plasma and increase the average effective path lengths of secondary electrons emitted from the cathode and the probability of such electrons having ionizing collisions with gas molecules within the switch. The interior cathode surface is provided with a coating formed from chromium or a chromium mixture. Chromium combines a high rate of secondary electron emission with low sputtering and other advantageous properties for plasma switch operation. Various types of chromium-plated perturbations are described.

公开(公告)号：WO1989012249A2

公开(公告)日：1989-12-14

申请号：PCT/US1989001686

申请日：1989-04-24

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  EFRON, Uzi ,  OWECHKO, Yuri

IPC: G02F01/35

CPC classification number: G02F1/3538 ,  G02F1/135

Abstract: An optical light valve system (10) for providing an amplified phase conjugated replica (S1*) of a potentially low intensity phase aberrated optical signal beam (S1) is disclosed herein. The optical light valve system (10) of the present invention includes a reference beam source (17) for providing a coherent reference beam (R) having first and second components of first and second polarization states, respectively. Further included is a signal beam source (15) for providing a coherent signal beam (S) of the first polarization state. An improved optical light valve (20) phase conjugates the second component of the reference beam in response to the aberrated beam (S1*).

公开(公告)号：WO1989010006A1

公开(公告)日：1989-10-19

申请号：PCT/US1989000858

申请日：1989-03-06

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  SIMONUTTI, Mario, D.

IPC: H01L23/56

CPC classification number: H01P1/005

Abstract: An arrangement for packaging an active millimeter wave device is provided having an active solid state diode (18) mounted on a cylindrical shaped heat sink pedestal (12). The cap (24) for the diode is an elongated cylindrical conductor which also serves as a portion of the center coaxial conductor and DC bias pin. A conductive annular ring (28) is also mounted on the pedestal encircling the diode and serves as the outer coaxial conductor for the coaxial transmission line structure. Advantageously the coaxial transmission line, namely the center and outer conductors, can be precisely assembled in relation to the diode for improved impedance characteristic and efficient energy coupling. Furthermore, the elongated cap (24) moves the point of contact with the bias pin (36) to a region of higher RF impedance, reducing RF losses.