摘要:
A method provides space-time adaptive processing (STAP) for target detection using adaptive matched filters (AMF). A generalized likelihood ratio test (GLRT) is determined where spatial and temporal correlation matrices Q and A are assumed. Then, the correlation matrices A and Q are replaced with maximum likelihood (ML) estimates obtained only from training signals subject to a persymmetric constraint.
摘要:
A method for detecting a target in a non-homogeneous environment using a space-time adaptive processing of a radar signal includes normalizing training data of the non-homogeneous environment to produce normalized training data; determining a normalized sample covariance matrix representing the normalized training data; tracking a subspace represented by the normalized sample covariance matrix to produce a clutter subspace matrix; determining a test statistic representing a likelihood of a presence of the target in the radar signal based on the clutter subspace matrix and a steering vector; and comparing the test statistic with a threshold to detect the target.
摘要:
A method for detecting a target in a non-homogeneous environment using a space-time adaptive processing of a radar signal includes normalizing training data of the non-homogeneous environment to produce normalized training data; determining a normalized sample covariance matrix representing the normalized training data; tracking a subspace represented by the normalized sample covariance matrix to produce a clutter subspace matrix; determining a test statistic representing a likelihood of a presence of the target in the radar signal based on the clutter subspace matrix and a steering vector; and comparing the test statistic with a threshold to detect the target.
摘要:
A method detects a target in a radar signal using space-time adaptive processing. A test statistic is T = max α max λ ∫ R f 1 ( x 0 , x 1 , … , x K ❘ α , λ , R ) p ( R ) ⅆ R max λ ∫ R f 0 ( x 0 , x 1 , … , x K ❘ λ , R ) p ( R ) ⅆ R , where x0 is a test signal, xk are K training signals, α is an unknown amplitude of a target signal within the test signal, λ is a scaling factor, R is a covariance matrix of the training signals, and a function max returns a maximum values. The test statistic is compared to a threshold to determine whether the target is present, or not.
摘要翻译:一种方法使用空时自适应处理来检测雷达信号中的目标。 一个检验统计量是T = maxα最大λ∫∫R f 1(x 0,x 1,...,x K |α,λ,R)p(R) ∫R f 0(x 0,x 1,...,x K |λ,R)p(R)ⅆR,其中x0是测试信号,xk是K个训练信号,α是 在测试信号内的目标信号的未知振幅,λ是比例因子,R是训练信号的协方差矩阵,函数max返回最大值。 将测试统计量与阈值进行比较,以确定目标是否存在。
摘要:
A method provides space-time adaptive processing (STAP) for target detection using adaptive matched filters (AMF). A generalized likelihood ratio test (GLRT) is determined where spatial and temporal correlation matrices Q and A are assumed. Then, the correlation matrices A and Q are replaced with maximum likelihood (ML) estimates obtained only from training signals subject to a persymmetric constraint.
摘要:
A method detects a target in a radar signal using space-time adaptive processing. A test statistic is T = max α max λ ∫ R f 1 ( x 0 , x 1 , … , x K α , λ , R ) p ( R ) R max λ ∫ R f 0 ( x 0 , x 1 , … , x K λ , R ) p ( R ) R , where x0 is a test signal, xk are K training signals, α is an unknown amplitude of a target signal within the test signal, λ is a scaling factor, R is a covariance matrix of the training signals, and a function max returns a maximum values. The test statistic is compared to a threshold to determine whether the target is present, or not.
摘要翻译:一种方法使用空时自适应处理来检测雷达信号中的目标。 一个测试统计量是T = max(α,max,λ)∫R f f 1(x 0,x 1,...,x Kα,λ,R) R 0 f(x 0,x 1,...,x Kλ,R)p R(R)其中x0是测试信号,xk是K个训练信号,α是未知振幅 的测试信号内的目标信号,λ是缩放因子,R是训练信号的协方差矩阵,函数max返回最大值。 将测试统计量与阈值进行比较,以确定目标是否存在。
摘要:
A photoacoustic catheter includes an elongated catheter body and a housing positioned near a distal end of the elongated catheter body. A length of multimode fiber extends through the elongated catheter body and has a distal end that is beveled at about 45° relative to a longitudinal axis of the multimode fiber and is positioned in the housing. An ultrasonic transducer, electrically connected to an electrical wire extending along the elongated catheter body, is positioned within the housing. A mirror element is also positioned within the housing and includes a mirror surface beveled at about 45° relative to the longitudinal axis of the multimode fiber. The catheter is operable to deliver an optical wave through the multimode fiber and to deliver an ultrasonic wave collinearly from the housing and out of an aperture of the housing to obtain optical data and ultrasonic data within a mammalian luminal organ.
摘要:
A method for switching video resolution includes: confirming that a video sender and a video receiver have established a video communication connection, and obtaining an initial resolution of the video sender; confirming that bandwidth of the video communication connection and hardware of the video sender meet preset conditions, and switching the initial resolution of the video sender to a target resolution, in which the target resolution is higher than the initial resolution. After establishing video communication connections between terminals, when there are available bandwidth and hardware of the terminal using video communication, the resolution of terminal may be switched to provide a more clear video communication for terminal user, and guarantee smooth switching of resolution.
摘要:
The present invention relates to a peptide derivative represented by the general formula (I) or a salt thereof: Z-(CH2)n—CO—NH-Leu-Ile-Gly-AA1-AA2-CO—R (I) wherein Z represents an aryl group which may or may not have a substituent or a heteroaryl group which may or may not have a substituent; n represents 0, 1 or 2: AA1-AA2 represents Lys-Val or Arg-Leu; and R represents —OH or —NH2, and relates to a pharmaceutical composition comprising a peptide derivative represented by the general formula (I) or a salt thereof, and a pharmaceutically acceptable carrier thereof. The peptide derivative is useful as a prophylactic and therapeutic agent of dysfunction of masticatory, dysphagia, dysgeusia, ozostomia, intra-oral cavity dysphoria, intra-oral cavity infections, intra-oral cavity inflammations, dry eye, ectocornea detachment, keratitis, corneal ulcer, conjunctivitis, stomach ulcer, duodenal ulcer, gastritis, diarrhea, enteritis or Sjogren's syndrome.
摘要:
A method for switching video resolution includes: confirming that a video sender and a video receiver have established a video communication connection, and obtaining an initial resolution of the video sender; confirming that bandwidth of the video communication connection and hardware of the video sender meet preset conditions, and switching the initial resolution of the video sender to a target resolution, in which the target resolution is higher than the initial resolution. After establishing video communication connections between terminals, when there are available bandwidth and hardware of the terminal using video communication, the resolution of terminal may be switched to provide a more clear video communication for terminal user, and guarantee smooth switching of resolution.