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公开(公告)号：US10680669B2
公开(公告)日：2020-06-09
申请号：US15556769
申请日：2016-03-04
申请人： CRFS LIMITED
IPC分类号： H04B17/00 , H04B1/10 , H04B1/71 , G01R23/165 , H04B1/7156
摘要： A frequency discriminator is described. The frequency discriminator comprises a power splitter (2) for splitting a signal into a plurality of paths (40, 41, 42, . . . , 4n). At least two of the plurality of paths (41, 42, . . . , 4n) include respective filters (121; 122, . . . , 12n) having different frequency characteristics which are configured to provide respective filtered signals to respective power detectors (161, 162, . . . , 16n. The frequency discriminator comprises an analogue-to-digital conversion section (8) which is configured to receive values of measured powers from the power detectors, to generate digital values of measured powers and to provide the digital values of measured powers to a digital processing section (10). The digital processing section is configured to estimate a value (11) of at least one frequency in the signal in dependence on the digital values, for example the ratio of the digital values, of measured powers and on frequency responses (201, 202, . . . , 20n; FIG. 2) of the filters.
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公开(公告)号：US10571544B2
公开(公告)日：2020-02-25
申请号：US15548332
申请日：2016-02-01
申请人： CRFS LIMITED
摘要： A method of determining incident angles of Radio Frequency, RF, signals received by an antenna array comprising a plurality of antennae is described. The method comprises generating a plurality of direction finding, DF, signals based on antenna signals received from the antenna array, wherein each DF signal corresponds to a respective antenna array element and each antenna array element corresponds to one or more antennae. A plurality of DF spectra are then generated, each DF spectrum corresponding to a respective DF signal and comprising measured values of signal power at two or more given respective frequencies. An incident signal angle is calculated for each given frequency, based on the measured values of power at the frequency, the configuration of the antennae in the antenna array and antenna gain patterns corresponding to the antenna array elements.
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公开(公告)号：US20180062680A1
公开(公告)日：2018-03-01
申请号：US15556769
申请日：2016-03-04
申请人： CRFS LIMITED
IPC分类号： H04B1/10 , H04B1/7156 , G01R23/165
摘要： A frequency discriminator is described. The frequency discriminator comprises a power splitter (2) for splitting a signal into a plurality of paths (40, 41, 42, . . . , 4n). At least two of the plurality of paths (41, 42, . . . , 4n) include respective filters (121; 122, . . . , 12n) having different frequency characteristics which are configured to provide respective filtered signals to respective power detectors (161, 162, . . . , 16n. The frequency discriminator comprises an analogue-to-digital conversion section (8) which is configured to receive values of measured powers from the power detectors, to generate digital values of measured powers and to provide the digital values of measured powers to a digital processing section (10). The digital processing section is configured to estimate a value (11) of at least one frequency in the signal in dependence on the digital values, for example the ratio of the digital values, of measured powers and on frequency responses (201, 202, . . . , 20n; FIG. 2) of the filters.
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公开(公告)号：US09729363B2
公开(公告)日：2017-08-08
申请号：US14166618
申请日：2014-01-28
申请人： CRFS Limited
IPC分类号： H04L27/14 , G01S7/02 , G01R23/165 , G01S5/04 , G01S5/06
CPC分类号： H04L27/14 , G01R23/165 , G01S5/04 , G01S5/06 , G01S7/021
摘要： A frequency discriminator comprising a power splitter for splitting a signal into first and second paths, wherein the first path is configured to provide a first, straight-through signal and the second path includes a frequency-dependent element, such as low-pass filter, so as to provide a second signal. The frequency discriminator further comprises a circuit configured to compare the first and second signals and generate an instantaneous frequency signal in dependence thereon.
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