PARAMETRIC FILTER USING HASH FUNCTIONS WITH IMPROVED TIME AND MEMORY

    公开(公告)号:WO2022191980A1

    公开(公告)日:2022-09-15

    申请号:PCT/US2022/017092

    申请日:2022-02-18

    Abstract: Method for searching an item using a parametric hash filter includes forming an input vector from input data stream; forming a hash matrix having a first portion and a second portion; multiplying the hash matrix with the input vector to generate a second input vector including a hash values of the first input vector; generating a perfect hash vector and a universal hash vector, by applying a smooth periodic function to the second input vector; mapping onto a Markov random field the coordinates of locations of hash values in a search domain for which there is no possibility of collisions in the perfect hash vector to form an energy function; minimizing the energy function to generate a compressed hash table; fitting a band of acceptable locations in the compressed hash table, based on a predetermined false positive rate; and searching for a new item in the band of acceptable locations.

    SYSTEM AND METHOD FOR UNDERWAY AUTONOMOUS REPLENISHMENT OF SHIPS

    公开(公告)号:WO2021247142A1

    公开(公告)日:2021-12-09

    申请号:PCT/US2021/026653

    申请日:2021-04-09

    Abstract: An autonomous loading/unloading system and method for transferring material includes: a buoy (106) for releasing onto water; a messenger line (108) coupled to the buoy for being pulled; a carrier line loop (110) coupled to the messenger line for being pulled, where a payload (112) is coupled to the carrier loop for transferring the material to or from an unmanned ship; a fetch/release platform (218) to fetch or release the payload from or onto the water; a loading/unloading dock for the payload; a plurality of line guides (212) for guiding the carrier loop; and a platform-to-payload interconnect (306) for autonomous loading or unloading of the material from /to the payload.

    SYSTEM AND METHOD FOR CANCELLING STRONG SIGNALS FROM COMBINED WEAK AND STRONG SIGNALS IN COMMUNICATIONS SYSTEMS

    公开(公告)号:WO2021007173A1

    公开(公告)日:2021-01-14

    申请号:PCT/US2020/040922

    申请日:2020-07-06

    Inventor: JUDELL, Neil

    Abstract: A receiver for cancelling strong signals from combined weak and strong signals includes: a first circuitry for inputting a weak and strong signal as an input; a parametric cancellation circuit for inputting a representation of the strong signal and an output of the first circuitry to produce a cancellation signal; a second circuitry electrically coupled to the parametric cancellation circuit for inputting the cancellation signal to produce a modulated output; a demodulator electronically coupled to the second circuitry for demodulating the modulated output to produce a demodulated output and an error signal, where the demodulated output is the data contained in the weak signal; and an adaptation logic circuit for inputting the representation of the strong signal, the demodulated output and the error signal to adaptively produce parameters for the parametric cancellation circuit. The parametric cancellation circuit further inputs the error signal and the parameters to produce the cancellation signal.

    RECONFIGURABLE APERTURE FOR MICROWAVE TRANSMISSION AND DETECTION
    39.
    发明申请
    RECONFIGURABLE APERTURE FOR MICROWAVE TRANSMISSION AND DETECTION 审中-公开
    用于微波传输和检测的可重新安装的孔

    公开(公告)号:WO2015047500A1

    公开(公告)日:2015-04-02

    申请号:PCT/US2014/044092

    申请日:2014-06-25

    Abstract: A reconfigurable aperture (200) includes a plurality of metallic particles (220) confined to a volume (216) extending across an aperture area. The metallic particles are repositioned within the volume to form opaque regions in the aperture area. The opaque regions, and transmissive regions between the opaque regions, can form a reconfigurable zone plate that can change the collimation of a microwave beam via diffraction therethrough. The zone plate can be located a fixed distance away from a microwave source and a detector in a housing, so that for any specified wavelength produced by the microwave source, the zone plate can reconfigure to have a focal length equal to the fixed distance. The reconfigurable zone plate can effectively collimate microwaves produced by the microwave source, can direct the collimated microwaves in a specified direction, can receive microwaves returning along the specified direction, and can focus the received microwaves onto the detector.

    Abstract translation: 可重新配置的孔(200)包括限制在横过孔区延伸的体积(216)的多个金属颗粒(220)。 金属颗粒在体积内重新定位,以在开口区域中形成不透明区域。 不透明区域和不透明区域之间的透射区域可以形成可重构区域板,其可以通过衍射从而改变微波束的准直。 区域板可以距离微波源和壳体中的检测器固定的距离,使得对于由微波源产生的任何指定波长,区域板可以重新配置为具有等于固定距离的焦距。 可重构区域板可以有效地准直由微波源产生的微波,可以在指定方向上引导准直的微波,可以接收沿指定方向返回的微波,并可将接收到的微波聚焦到检测器上。

    SYSTEMS AND METHODS FOR DETECTING SHOOTER LOCATIONS FROM AN AIRCRAFT
    40.
    发明申请
    SYSTEMS AND METHODS FOR DETECTING SHOOTER LOCATIONS FROM AN AIRCRAFT 审中-公开
    用于从飞机检测发射机位置的系统和方法

    公开(公告)号:WO2010030433A3

    公开(公告)日:2014-10-16

    申请号:PCT/US2009050814

    申请日:2009-07-16

    CPC classification number: G01S3/8086 F41G3/147 G01S3/801

    Abstract: The systems and methods described herein relate to an airborne shooter detection system having a plurality of sensors coupled to the body of an aircraft such as a helicopter. The system includes at least five sensors configured and arranged to disambiguate the location of a shooter. By measuring the arrival times of the Shockwaves of projectiles at each of the sensors and determining the differences in the arrival times among sensors, the systems and methods may determine the location of one or more sources of the projectiles. A distance of at least ten meters separates two or more of the sensors. Such a separation is advantageous because it allows the system to disambiguate multiple shooters by resolving the curvature of the Shockwave.

    Abstract translation: 本文所述的系统和方法涉及具有耦合到诸如直升机的飞行器的主体的多个传感器的机载射手检测系统。 该系统包括配置和布置成消除射手位置的至少五个传感器。 通过测量每个传感器上的射弹冲击的到达时间并确定传感器之间的到达时间的差异,系统和方法可以确定一个或多个射弹源的位置。 距离至少十米的两个或更多个传感器。 这种分离是有利的,因为它允许系统通过解决冲击波的曲率来消除多个射手的歧义。

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