公开(公告)号：WO1988001442A1

公开(公告)日：1988-02-25

申请号：PCT/US1987001719

申请日：1987-07-23

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  ROSEN, Harold, A.

IPC: H01Q05/00

CPC classification number: H01Q15/0033 ,  H01Q5/45

Abstract: A frequency selective screen (18) is employed as a diplexer to separate each of one or more radio frequency signals into first and second bands of frequencies by allowing the first band of frequencies to pass therethrough and reflecting the second band of frequencies. The screen (18) includes an array of discrete, electrically conductive elements (32), preferably copper, formed on a substrate (33) such as a layer of polyimide. The conductive elements (32) possess a geometry which results in an equivalent electrical circuit (50) that exhibits parallel resonance, high impedance within the first band of frequencies and series resonance, low impedance within the second band of frequencies, thereby transmitting the signal in the first frequency band and reflecting the signal in the second frequency band. The screen (18) may include first and second portions (18a, 18b) in which the conductive elements (32) are respectively oriented along different axes to respectively separate horizontally and vertically polarized signals. The screen (18) may be employed in a satellite (10) to separate transmit and receive frequencies.

公开(公告)号：WO1988001389A1

公开(公告)日：1988-02-25

申请号：PCT/US1987001801

申请日：1987-07-23

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  NEUFELD, Murray, J.

IPC: G01P21/00

CPC classification number: G01P21/00

Abstract: A spin-stabilized spacecraft has a pair of three-axis accelerometers (A, C) mounted on the spacecraft rotor (10) to provide for self-aligning, enduring and sophisticated navigational capability. A second pair of accelerometers (B, D) is added for redundancy and added sensitivity. Each pair of accelerometers are disposed at diametrically opposed positions on the rotor and respective axes are co-aligned. The orientation of spacecraft angular momentum h(Boolean not) is determined by star and planet sensors. Radial alignment of each accelerometer relative to the spacecraft angular momentum is attained by zeroing non-radial accelerometer readings during spacecraft quiescence. Axial alignment is attained during periods of substantially axial thrust by isolating axial translational acceleration by summing readings across an accelerometer pair to cancel rotational, spin-periodic contributions to the readings and time-averaging or otherwise filtering to cancel other non-axial periodic contributions to the readings. Axial alignment is automatically effected upon the correct alignment of the radial and tangential axes of each accelerometer.

公开(公告)号：WO1988001373A1

公开(公告)日：1988-02-25

申请号：PCT/US1987001502

申请日：1987-06-29

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  POLLACK, Slava, A. ,  SHIH, I-FU ,  TZENG, Robert

IPC: G01M11/00

CPC classification number: G01M11/33 ,  G01J1/4257

Abstract: Apparatus for measuring the numerical aperture of an optical fiber in the infrared region. The optical fiber (8) is appropriately mounted in accordance with conventional testing standards. Infrared energy is transmitted through the optical fiber (8). At a predetermined distance from the end of the optical fiber, a conversion screen (10) can be provided for transforming the emitted infrared energy into a lesser wavelength of energy. The energy distribution can be recorded with a detector compatible with the lesser wavelength energy whereby the numerical aperture can be computed from the recorded data.

公开(公告)号：WO1988001041A1

公开(公告)日：1988-02-11

申请号：PCT/US1987001065

申请日：1987-05-12

Applicant: HUGHES AIRCRAFT COMPANY

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

IPC: F41G07/22

CPC classification number: F41G7/2293 ,  F41G7/2213 ,  F41G7/2246 ,  F41G7/2253 ,  F42B15/01 ,  G02B26/10

Abstract: A pair of rotating gimbals (12, 14) independently nutate and precess the line-of-sight (24) of a sensor (22) to generate a rosette pattern (26).

公开(公告)号：WO1988000737A1

公开(公告)日：1988-01-28

申请号：PCT/US1987001332

申请日：1987-06-05

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  NASH, James, G. ,  SHU, David, B.

IPC: G06F15/62

CPC classification number: G06F15/8023 ,  G06T1/20

Abstract: A computer architecture for analyzing automatic image understanding problems. The architecture is designed so that it can efficiently perform a wide spectrum of tasks ranging from low level or iconic processing to high level or symbolic processing tasks. A first level (12) of image processing elements is provided for operating on the image matrix on a pixel per processing elements basis. A second level (14) of processing elements is provided for operating on a plurality of pixels associated with a given array of first level processing elements. A third level (16) of processing elements is designed to instruct the first and second level processing elements, as well as for operating on a larger segment of the matrix. A host computer (18) is provided that directly communicates with at least each third level processing element. A high degree of parallelism is provided so that information can be readily transferred within the architecture at high speeds.

公开(公告)号：WO1988000404A1

公开(公告)日：1988-01-14

申请号：PCT/US1987001183

申请日：1987-05-21

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  SCHULMAN, Joel, N. ,  VAIDYANATHAN, Kavasseri, V. ,  SMIRL, Arthur, L.

IPC: H01S03/19

CPC classification number: B82Y20/00 ,  H01S5/34 ,  H01S5/3415 ,  H01S5/3416

Abstract: A resonant quantum well laser (20) incorporates semiconductor barriers (26) on one or both sides of the quantum well (22) to increase the charge density within the quantum well. The composition of the injection layers (24) can be tailored in a manner that the energies of the charge carriers in the injection layers are about that of a resonant energy level for that type of charge carrier in the quantum well. The barrier layers (26) on one or both sides of the quantum well (22) enhance the probability of the charge carrier being in the well for a longer time and travelling a longer distance, increasing the chance of scattering. The charge carriers, electrons or holes, can move from their respective injection layers (24) into nearly identical energy levels within the quantum well (22), by tunneling through the thin barrier layers (26). The number of carriers which are available to transfer into the lasing energy level is increased, thereby increasing the efficiency of the laser and lowering its threshold current.

公开(公告)号：WO1988000354A1

公开(公告)日：1988-01-14

申请号：PCT/US1987001199

申请日：1987-05-26

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  WILEY, Carl, A.

IPC: G01S11/00

CPC classification number: G01K11/006 ,  G01S11/02

Abstract: A method and apparatus for precisely determining the relative velocity of an interferometer and a scene being scanned. The apparatus uses a matched filter technique in which reference signals based on high and low relative velocity estimates are correlated with an incoming interferometer signal and controllably adjusted until the correlation is maximized. The controllably adjusted reference signals are then used to produce an extremely accurate and precise measurement of relative velocity.

公开(公告)号：WO1987007438A1

公开(公告)日：1987-12-03

申请号：PCT/US1987000681

申请日：1987-03-30

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  SCHELLENBERG, James, M. ,  YAU, Wing

IPC: H01P05/12

CPC classification number: H01P5/16 ,  H01P5/12

Abstract: An N-way, broad band planar power divider/combiner circuit (10) for dividing or combining RF signals which includes a tapered strip (1) of electrically conductive material having a plurality of conductor fingers (5) which define a plurality of ports (6) at the wide end (3) of the taper, and having a narrow end (2) which defines single port. The tapered metal strip is mounted onto a dielectric slab (8), and isolation resistors (7) connect adjacent fingers. A single RF signal can be fed into the single port which will be divided into a plurality of signals of equi-amplitude and equi-phase. Conversely, a plurality of RF signals can be fed into the ports at the wide end which will be combined into a single signal.

Abstract translation: 一种用于分割或组合RF信号的N路宽带平面功率分配器/组合器电路（10），其包括具有限定多个端口（5）的多个导体指（5）的导电材料的锥形带（1） 6）在锥形的宽端（3）处，并且具有限定单个端口的窄端（2）。 锥形金属条安装在电介质板（8）上，隔离电阻（7）连接相邻的手指。 单个RF信号可以馈送到单个端口中，该端口将被分成等幅度和等相的多个信号。 相反，多个RF信号可以被馈送到将被组合成单个信号的宽端的端口中。

公开(公告)号：WO1987007380A1

公开(公告)日：1987-12-03

申请号：PCT/US1987000917

申请日：1987-04-23

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  LESLEY, Arthur, M. ,  JARON, William

IPC: G01N17/00

CPC classification number: G01N17/00

Abstract: An environmental chamber for providing thermal stress screening is comprised of a plurality of modular components which may be quickly assembled and disassembled for ease of maintenance and repair. In particular, a heater/cooling unit is coupled by means of a plurality of quick release lockable fasteners to a plenum module. The plenum module in turn is coupled by means of additional quick release lockable fasteners to a blower module. The plenum module in turn is comprised of a heater plenum which communicates with a blower plenum. Gas is drawn into the heater plenum and passed over heating coils which are disposed into the heating plenum from the heating/cooling module. The gas is then communicated to a blower plenum. Cryogenic nitrogen gas is constantly bled through a small (.015'') hole of the liquid nitrogen valve body and is selectively provided to the blower plenum from the heating/cooling module. The selectively heated or cooled gas is then expelled from the blower plenum by means of a blower which extends into the blower plenum from the blower module. Selective heated and cooled gas is directed to a part under test as selectively activated through proportional, integral and derivative control in response to the temperature requirements of the part under test and not in response to the gas delivered to the part or from the blower plenum.

公开(公告)号：WO1987007023A1

公开(公告)日：1987-11-19

申请号：PCT/US1987000650

申请日：1987-03-27

Applicant: HUGHES AIRCRAFT COMPANY

Inventor： HUGHES AIRCRAFT COMPANY ,  CHAMPETIER, Robert, J.

IPC: G01N21/88

CPC classification number: G01N21/94 ,  G01N2201/0621 ,  G01N2201/08

Abstract: Contamination, either in the form of particulate matter (46), e.g., dust and non-wetting liquid, or surface discontinuities (48), such as a smooth film or cratering, is collected on an exposed glass plate (12). Illumination at an angle incident with respect to a surface (14) of the glass plate causes the particulate matter to scatter light. A further light source illuminates the inside volume of the glass, causing light to scatter from the surface discontinuities. Either source of light scattering is detected by an optically sensitive detector (18) positioned beneath the glas plate. A bandpass filter (24) between the glas plate and the detector rejects spurious radiation.