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公开(公告)号：US20230138687A1
公开(公告)日：2023-05-04
申请号：US17515797
申请日：2021-11-01
申请人： SRC, Inc.
摘要： A monopole antenna, comprising: a radiating element, wherein the radiating element has a first curved outer surface that is rotationally symmetric about a longitudinal axis extending through the monopole antenna, wherein a first diameter at a first end of the radiating element is less than a second diameter at a second end of the radiating element; and a ground plane disposed opposite the radiating element such that an electric field is generated by the radiating element with a ground plane providing the counterpoise, wherein the ground plane has a second curved outer surface that is rotationally symmetric about the longitudinal axis, wherein a first diameter at a first end of the ground plane is less than a second at a second end of the ground plane, wherein the first end of the radiating element is disposed adjacent the first end of the ground plane.
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公开(公告)号：US20230058231A1
公开(公告)日：2023-02-23
申请号：US17408056
申请日：2021-08-20
申请人： SRC, Inc.
发明人： Andrew Nadeau , John C. Dougherty
摘要： A discrete-time, digital filter for notch filtering a complex digital signal, the filter having a transfer function allowing selective filtering of complex signal components. A system for receiving a modulated signal, the system including a processor for adaptively generating filter coefficients of a discrete-time, digital filter, for filtering a complex discrete-time signal, the processor configured to (i.) identify a number of signal samples in a discrete-time signal, and use the signal samples to calculate autocorrelation values sufficient to calculate the filter coefficients, (ii.) solve a system of equations, the system of equations defined by a Toeplitz matrix and a vector to determine the coefficient values, the Toeplitz matrix defined using the autocorrelation values, and the vector defined as the autocorrelation values of a white noise signal.
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公开(公告)号：US20220397662A1
公开(公告)日：2022-12-15
申请号：US17140596
申请日：2021-01-04
申请人： SRC, Inc.
发明人： Harvey K. Schuman
摘要： A radar system includes an antenna array including a plurality of antenna elements; and a transmitter portion coupled to the antenna array, the transmitter portion being configured to sequentially transmit a first transmit beam and a second transmit beam from a single pulse, the first transmit beam and second transmit beam being formed using the same aperture of the antenna array, wherein a skew angle of the first transmit beam is distinct from a skew angle of the second beam. Such radar system alternatively transmitting through subarrays and receiving each via the entire array and combining the signals such that the transmit and receive parts of one of two 2-way beams point in the same direction and the transmit and receive parts of the second 2-way beam point in the same direction and these directions are within a standard beamwidth of each other.
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公开(公告)号：US11482988B1
公开(公告)日：2022-10-25
申请号：US17349201
申请日：2021-06-16
申请人： SRC, Inc.
摘要： A system and method for tuning a transistor-based circuit. The system includes a negative impedance converter circuit having a capacitor, a first transistor, and a second transistor. As a current travels through the capacitor, the first transistor and the second transistor each sample voltage at the capacitor and invert the voltage at an input of the negative impedance converter circuit. The negative impedance converter circuit also has a third transistor in series with the capacitor. The third transistor has a base voltage. Changing the base voltage of the third transistor changes the voltage sampled by the first transistor and the second transistor.
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公开(公告)号：US20220252715A1
公开(公告)日：2022-08-11
申请号：US17169732
申请日：2021-02-08
申请人： SRC, INC.
摘要： A radar system, comprising: a receive antenna configured to receive a receive signal reflected from a bullet, the receive signal exhibiting a Doppler shift according to the motion of the bullet; and a detector implementing a set of matched filters each configured to determine a measure of correlation between the Doppler shift of the receive signal and one of a set of pre-stored Doppler shifts, wherein each of the pre-stored Doppler shifts respectively represents the Doppler shift of a bullet passing the antenna at a different speed or a distance of a point of closest approach.
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6.发明申请公开(公告)号：US20210201171A1
公开(公告)日：2021-07-01
申请号：US16727297
申请日：2019-12-26
申请人： SRC, Inc.
发明人： Sean T. O'Hara
摘要： A system for developing machine learning for use in the radiofrequency domain that produces a robust set of training data for machine learning from a small set of labelled training data that is bootstrapped with unlabeled electromagnetic environment data. A raw signal set is prepared from the labeled data and separately processed for any electromagnetic environment and interference signals as well as for a primary signal by applying the real electromagnetic environment data and then summed to generate a second data set that is larger than the first data set. Feature extraction is used to produce a bootstrapped labelled data set that is larger than the original labelled data set and that can be used as training data for machine language classification.
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公开(公告)号：US10915152B2
公开(公告)日：2021-02-09
申请号：US15497944
申请日：2017-04-26
申请人： SRC, Inc.
摘要： Methods and systems for scalable high-performance embedded computing architectures. According to an embodiment, a scalable high-performance embedded computing system increases computational capability within the restrictive size, weight, and power constraints of systems such as the external pod payloads of unmanned aircraft systems, among many other possible systems. The core computer capability can be placed in various environments, and according to one embodiment utilizes a flight-certified aeronautics pod that is scalable in length. The scalable HPEC system can be connected to external data sources, or the nose and tail can be made of Radio Frequency transparent material, enabling the use of various RF sensing technologies within the same aeronautics enclosure. According to an embodiment, a lightweight, thermally-efficient conduction cooled chassis supports the required board and interface hardware.
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公开(公告)号：US10907193B2
公开(公告)日：2021-02-02
申请号：US13898917
申请日：2013-05-21
申请人： SRC, Inc.
发明人： Huda Sirageldin Suliman , Stacey Ann Massulik , Frances Louise Stites , Timothy Francis Moshier , Kenton Arthur Doctor , Jeffrey Harold Mills , Lisa Helen Chamberlin
IPC分类号： G01N33/542 , C12Q1/6806 , C12Q1/68
摘要： A device, method, and system for the detection of ribosome inactivating protein activity, including the ricin toxin, in a sample. According to one embodiment, the ribosome inactivating protein in the sample removes an adenine from a labeled DNA substrate to create an abasic site. An AP lyase can then cleave the DNA substrate at the abasic site, allowing the fluorophore located at or near one end of the DNA substrate and the quencher at or near the other end of the DNA substrate to spatially separate. Once the fluorophore and the quencher are sufficiently separated, the fluorophore will emit a fluorescence signal. Increasing fluorescence, indicating ribosome inactivating protein activity, will be monitored in real time using a detection system.
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公开(公告)号：US20200271754A1
公开(公告)日：2020-08-27
申请号：US16866800
申请日：2020-05-05
申请人： SRC, Inc.
发明人： David L. Weldum
摘要： A method of processing a radar hit from an object using, for each of a plurality of cells, a signal strength threshold, a hit rate threshold, a time of last detection; and receiving, for one of the plurality of cells corresponding to the object, a measured signal strength, a measured hit rate and a time of measurement. The object is identified as clutter if the measured hit rate is greater than the hit rate threshold, and the measured signal strength is less than signal strength threshold. The signal strength threshold is above a conventional CFAR signal threshold. Measured Doppler strength may also be used to identify clutter. Identification can be determined using Doppler-polarity-specific data values. The hit rate and the mean Doppler speed of the one of the plurality of cells can be updated using a running average.
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公开(公告)号：US20190219670A1
公开(公告)日：2019-07-18
申请号：US16209469
申请日：2018-12-04
申请人： SRC, Inc.
CPC分类号： G01S7/2813 , G01S13/68 , H01Q21/0025 , H01Q21/061
摘要： A transmit-receive radar system having multiple sub-apertures aligned in an offset, off-centered cross pattern that allows for searching of a sub-aperture pattern for the peak response without having to retransmit beams. The placement of the physical apertures combined with the use of MIMO operations provides a non-uniform distribution of virtual sub-apertures that suppresses ambiguous grading lobes and maintains angle resolution in a manner equivalent to that of non-MIMO approaches. As a result, target detection is enabled within a significantly larger angular area than in a non-MIMO configuration.
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