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    Motion extended array synthesis for use in high resolution imaging applications
    4.
    发明授权
    Motion extended array synthesis for use in high resolution imaging applications 有权

    公开(公告)号：US11249183B2

    公开(公告)日：2022-02-15

    申请号：US17039602

    申请日：2020-09-30

    申请人： Leidos, Inc.

    发明人： John R. Kendra

    IPC分类号： G01S13/90 ,  G01S13/46 ,  G01S13/58 ,  G01S13/02

    摘要： A process and systems for constructing arbitrarily large virtual arrays using two or more collection platforms (e.g. AUX and MOV systems) having differing velocity vectors. Referred to as Motion Extended Array Synthesis (MXAS), the resultant imaging system is comprised of the collection of baselines that are created between the two collection systems as a function of time. Because of the unequal velocity vectors, the process yields a continuum of baselines over some range, which constitutes an offset imaging system (OIS) in that the baselines engendered are similar to those for a real aperture of the same size as that swept out by the relative motion, but which are offset by some (potentially very large) distance.

    Quantum detection and tracking of pulsed optical signals
    5.
    发明授权
    Quantum detection and tracking of pulsed optical signals 有权

    公开(公告)号：US11233565B2

    公开(公告)日：2022-01-25

    申请号：US17064061

    申请日：2020-10-06

    申请人： Leidos, Inc.

    发明人： James Charles Lundberg ,  Christopher Hochuli Fisher ,  Mark Edwin Krepel

    IPC分类号： H04B10/079 ,  H04B10/70

    摘要： Apparatus for detecting pulse optical position modulated signals with high background noise by detection of quantum arrival rate at the detector are described. Pulse signals at the detection limit are characterized by the arrival of clusters of individual photons at an optical receiver. The receiver has embedded shot noise that interferes with the detection of the signal of interest. The apparatus distinguishes the signal of interest by a measurement of the rate of arrival of the photons of the signal of interest from the ambient shot noise rate of the receiver. The apparatus determines the optimal signal detection criteria and calculates the expected bit error rate of the decoded data.

    Deep ocean long range underwater navigation algorithm (UNA) for determining the geographic position of underwater vehicles
    8.
    发明授权
    Deep ocean long range underwater navigation algorithm (UNA) for determining the geographic position of underwater vehicles 有权

    公开(公告)号：US10955523B1

    公开(公告)日：2021-03-23

    申请号：US15804695

    申请日：2017-11-06

    申请人： Leidos, Inc.

    发明人： Peter N. Mikhalevsky

    IPC分类号： G01S5/22 ,  G06F30/20

    摘要： An underwater navigation algorithm (UNA) uses acoustic signals transmitted in the ocean from sources at known positions to compute a position underwater for a vehicle that requires no initial a priori position or any ocean sound speed information or any initial GPS position that would require surfacing. The UNA consists of two parts, (1) the Cold Start Algorithm (CSA) and (2) the CSA with Modeling (CSAM). The underwater vehicle needs to be equipped with only a single hydrophone acoustic receiver and an onboard processor. The CSA requires only measuring the travel time of the end of the arrival coda (EOC) from each of the sources to compute a position. The CSAM is a post CSA procedure to calculate a higher accuracy position using the CSA position. CSAM utilizes the CSA position and a 4D sound speed field derived from an ocean 4D General Circulation Model (GCM) constrained using Ocean Acoustic Tomography (OAT) in the ocean area of operation and further includes (1) computing a modeled result with an acoustic propagation modeling code that is compared with the received acoustic data using a known procedure called “bulk shifting” and/or (2) a new proposed procedure that uses calculated group speeds from the 4D sound speed field, to provide a higher accuracy estimate of the receiver position.