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86 results about "Loading factor" patented technology

Low consumption dielectric material high temperature complex dielectric constant test device and method

The invention discloses a device and a method for testing high-temperature complex permittivityes of low-loss dielectric materials, which belongs to the micro-wave, millimeter wave low-loss dielectric materials complex permittivityes testing technique. The testing device comprises a micro wave signal source, a cylinder type high Q resonant cavity, a scalar network analyzer, and a vacuum high-temperature furnace, wherein the cylinder type high Q resonant cavity comprises a cylinder cavity tube, an upper end cover, a lower end cover, and a connecting wave guide, whole resonant cavity adopts thin-wall precious metals to form a cavity, and adopts high-temperature resisting material to form a supporting body. Adoption of the testing device comprises testing a resonating frequency rate of an empty cavity f0 and a non-loading quality factor Q0, and testing the resonating frequency rate f0 epsilon and the non-loading factor Q0 epsilon of a rear resonating cavity of a testing sample of a loading low-loss dielectric under the same high temperature, and calculating out the high-temperature complex permittivityes of the low-loss dielectric materials. The invention has the advantages of wide applying frequency range, high testing temperature, low cost, convenient testing, and little testing error, and is applicable to high temperature tests of the complex permittivityes of the low-loss dielectric materials in each microwave, millimeter wave frequency band range.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Target detection method based on two-dimensional sliding window robust space-time self-adaptive processing

The invention provides a target detection method based on two-dimensional sliding window robust space-time self-adaptive processing, which can increase the accuracy of target detection. The target detection method comprises the steps of : step 1, receiving echo data through an airborne radar; step 2, carrying out space-time sliding window processing on the echo data; step 3, establishing a target apparent steering vector error boundary matrix; step 4, calculating an autocorrelation matrix of projectional component of the echo data after space-time sliding window processing on an orthogonal complementary space of a subspace formed by the target; step 5, calculating a correlation matrix after diagonal loading of the autocorrelation matrix; step 6, solving a weight vector; step 7, judging whether a module value of a column vector obtained through multiplying a conjugate transpose matrix of the boundary matrix by the weight vector is less than 1, if so, increasing loading factors and then executing step 5 and step 6, otherwise, regarding the weight vector as the optimal weight vector; and step 8, constructing a filter by utilizing the optimal weight vector so as to filter the echo data after space-time sliding window processing, and acquiring target echo data.
Owner:XIDIAN UNIV
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