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公开(公告)号：US11156647B1
公开(公告)日：2021-10-26
申请号：US16894285
申请日：2020-06-05
发明人： Masoud Farshchian
IPC分类号： G01R29/027
摘要： Techniques, systems, architectures, and methods for estimating the rise time of a pulse for multi-channel and signal channel cases involving an optimization system and method that can be solved iteratively based on sparse priors for a wide span of signal-to-noise ratios.
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2.发明授权公开(公告)号：US11982698B2
公开(公告)日：2024-05-14
申请号：US17128825
申请日：2020-12-21
发明人： Masoud Farshchian
IPC分类号： G01S7/28 , G01R29/02 , G01R29/033 , G01S5/02 , G01S7/36 , G01S13/02 , G01S13/76 , G01R29/027 , G06F17/14 , G06F17/16
CPC分类号： G01R29/023 , G01R29/033 , G01S5/0278 , G01S7/36 , G01R29/027 , G01S13/762 , G06F17/14 , G06F17/16
摘要： A feature detection system, the system comprising: at least one processor in operative communication with a signal source, said processor further comprising at least one non-transitory storage medium, wherein at least one non-transitory storage medium contains instructions configured to cause the processor to: apply a joint group sparse denoising and delay estimation approach to a signal received from said signal source; and output statistics regarding the signal, wherein the joint group sparse denoising and delay estimation approach comprises; using the following equation:
{
x
*
,
τ
*
}
=
argmin
x
,
τ
{
1
2
∑
j
=
1
M
y
j
-
x
2
2
+
∑
i
=
0
N
λ
i
φ
i
(
D
i
l
i
x
)
}
where: ϕi are regularization functions; ∥y−x∥22 is a data-fidelity term and, in embodiments, is chosen as the least-square term; li are real numbers; Di are operators, which may be linear filters that can be written in matrix form; λi are regularization parameters; and x*,τ* represent estimates of at least one transmitted pulse and associated delay, and solving the equation for multiple values of ϵ; choosing a vector, x, such that a cost function comprising the data fidelity term and regularization function is minimized; determining the ϵ that corresponds to the x that minimizes the cost function; and calculating the pulse width of the received signal, which corresponds to the desired estimate of the vector, x.-
公开(公告)号：US11088877B1
公开(公告)日：2021-08-10
申请号：US16865639
申请日：2020-05-04
摘要： Techniques, systems, architectures, and methods for providing improved feature detection of signals, especially those in relatively high interference regions, thereby allowing for earlier and longer range detection of communications and radar signals are herein provided. The techniques utilize a general framework of total variation denoising, where signals are assumed to be sparse in a combination of their first or higher order derivatives, to increase signal-to-interference ratio, which is followed by cyclostationarity detection, which is used to estimate signal features, including the period of the signals of interest and their modulation type.
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4.发明申请公开(公告)号：US20220196793A1
公开(公告)日：2022-06-23
申请号：US17128825
申请日：2020-12-21
发明人： Masoud Farshchian
摘要： A feature detection system, the system comprising: at least one processor in operative communication with a signal source, said processor further comprising at least one non-transitory storage medium, wherein at least one non-transitory storage medium contains instructions configured to cause the processor to: apply a joint group sparse denoising and delay estimation approach to a signal received from said signal source; and output statistics regarding the signal, wherein the joint group sparse denoising and delay estimation approach comprises; using the following equation: { x * , τ * } = argmin x , τ { 1 2 ∑ j = 1 M y j - x 2 2 + ∑ i = 0 N λ i φ i ( D i l i x ) } where: ϕi are regularization functions; ∥y−x∥22 is a data-fidelity term and, in embodiments, is chosen as the least-square term; li are real numbers; Di are operators, which may be linear filters that can be written in matrix form; λi are regularization parameters; and x*,τ* represent estimates of at least one transmitted pulse and associated delay, and solving the equation for multiple values of ϵ; choosing a vector, x, such that a cost function comprising the data fidelity term and regularization function is minimized; determining the ϵ that corresponds to the x that minimizes the cost function; and calculating the pulse width of the received signal, which corresponds to the desired estimate of the vector, x.
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公开(公告)号：US20220034994A1
公开(公告)日：2022-02-03
申请号：US16943002
申请日：2020-07-30
发明人： Masoud Farshchian
摘要： Techniques, systems, architectures, and methods for estimating the time difference of arrival (TDOA) based on a joint-optimization formulation, the method comprising providing at least two noisy signals, y1 and y2, where the signals are measured across different antenna elements and where one signal is a delayed amplitude, scaled version of the other signal; and estimating the TDOA using an optimization formulation.
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