# US 10,502,822 B2 · Wind turbine rejection in non-scanning radar > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,822 B2 - Document ID: US10502822B2 - Status: Granted - Kind: B2 - Application number: 14/757,498 - Filed: 2015-12-23 - Published: 2016-06-23 - Granted: 2019-12-10 - Earliest claimed: 2014-12-23 - Assignees: Thales Holdings UK PLC - Applicants: Thales Holdings UK Plc - Inventors: Andrew Gerald Stove - Web page: https://patentgrep.com/patent/US10502822B2 ## CPC - G01S 13/003: {Bistatic radar systems; Multistatic radar systems} - G01S 7/41: using analysis of echo signal for target characterisation; Target signature; Target cross-section - G01S 13/52: Discriminating between fixed and moving objects or between objects moving at different speeds - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract A signal detector for detecting an information component of a passive radar detection signal, comprises a sampler operable to obtain a sample segment, in time domain, of a radar detection signal, a signal processor operable to identify a relatively high power periodic component of the sample segment signal spectrum in contrast to a relatively low power information component of the sample segment signal spectrum, and a signal rejector operable to window the detection signal with respect to the identified periodic component, to retain parts of the signal not interfered by said periodic component. ## Claims ### Claim 1 A signal detector for detecting an information component of a non-scanning radar detection signal, comprising: a sampler operable to obtain a sample segment, in time domain, of a radar detection signal; a signal processor including a blade flash detector operable to identify a first component of the sample segment signal spectrum, the first component having a relatively high power and short duration in contrast to a second component of the sample segment signal spectrum, the first component being defined by an envelope of relatively high power, low frequency periodic pulses compared with an information component of the detection signal; and a signal rejector operable to attune to the frequency of the pulses detected by the blade flash detector and to apply a rejection function to the detection signal, so as to reject the detected pulses, the rejection function being in period with the detected pulses, wherein the signal rejector is operable to window the detection signal with respect to the identified first component to suppress the signal in its entirety during one or more time periods of the signal coincident with the first component and to retain parts of the signal not interfered by said first component. ### Claim 2 (depends on 1) A signal detector in accordance with claim 1, wherein the signal processor is operable to identify a periodic nature of the first component, and wherein the signal rejector is operable to window the detection signal with respect to the periodic nature of the first component. ### Claim 3 (depends on 2) A signal detector in accordance with claim 2, wherein the signal processor includes a filter for filtering the radar detection signal to obtain a filtered signal in which the duration of the first component is reduced. ### Claim 4 (depends on 1) A signal detector in accordance with claim 1, further comprising a signal interpolator operable to introduce a replacement signal component to replace a signal component rejected by the signal rejector. ### Claim 5 (depends on 4) A signal detector in accordance with claim 4, wherein the signal interpolator is operable to interpolate in the time domain. ### Claim 6 (depends on 4) A signal detector in accordance with claim 4, wherein the signal interpolator is operable to interpolate in the frequency domain. ### Claim 7 A signal detector for detecting an information component of a passive radar detection signal, comprising: a blade flash detector for detecting a signal component defined by an envelope of relatively high power, low frequency periodic pulses compared with an information component of the detection signal; and a rejector operable to attune to the frequency of the pulses detected by the blade flash detector and to apply a rejection function to the detection signal, so as to reject the detected pulses, the rejection function being in period with the detected pulses. ### Claim 8 A method of detecting an information component of a passive radar detection signal, comprising: obtaining a sample segment, in time domain, of a radar detection signal; identifying, by a blade flash detector, a relatively high power periodic component of the sample segment signal spectrum in contrast to a relatively low power information component of the sample segment signal spectrum, the first component being defined by an envelope of relatively high power, low frequency periodic pulses compared with an information component of the detection signal; attuning, by a rejector, to the frequency of the detected pulses; and applying, by the rejector, a rejection function to the detection signal so as to reject the detected pulses, the rejection function being in period with the detected pulses, wherein the detection signal is windowed with respect to the identified periodic component to suppress the signal in its entirety during one or more time periods of the signal coincident with the relatively high power periodic component and to retain parts of the signal not interfered by said periodic component. ### Claim 9 A method of detecting an information component of a passive radar detection signal, comprising: detecting, by a blade flash detector, a signal component defined by an envelope of relatively high power, low frequency periodic pulses compared with an information component of the detection signal; attuning, by a rejector, to the frequency of the detected pulses; and applying, by the rejector, a rejection function to the detection signal so as to reject the detected pulses, the rejection function being in period with the detected pulses.