# US 10,313,220 B2 · System and method for emitter detection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,313,220 B2 - Document ID: US10313220B2 - Status: Granted - Kind: B2 - Application number: 15/212,792 - Filed: 2016-07-18 - Published: 2018-01-18 - Granted: 2019-06-04 - Earliest claimed: 2016-07-18 - Assignees: The Boeing Company - Applicants: Peter S. Wittenberg; Brian D. Cordill - Inventors: Peter S. Wittenberg; Brian D. Cordill - Web page: https://patentgrep.com/patent/US10313220B2 ## CPC - H04L 43/16: Threshold monitoring - G01S 7/021: {Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals} - H04L 43/022: by sampling - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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 receiver includes receive circuitry. The signal receiver further includes a processor coupled to the receive circuitry and configured to receive, from a filter, a stream of samples including a first set of samples. A data rate of an input of the filter may correspond to a data rate of an output of the filter. The first set of samples includes multiple samples. The processor is further configured to perform a detection operation on the first set of samples. The processor is further configured to detect a signal emitter based on the detection operation. ## Claims ### Claim 1 A signal receiver comprising: receive circuitry to receive a signal; a filter configured to generate sets of streaming output based on the signal, each set of streaming output comprising samples; and a processor coupled to the receive circuitry and configured to, for each set of streaming output: determine, based on in-phase and quadrature representations of each sample and an estimated system noise level of the receive circuitry, whether each sample satisfies a signal to noise threshold; detect a signal emitter based on at least a first number of samples in a particular number of consecutive samples satisfying the signal to noise threshold; and generate an indication of emitter detection based on detecting the signal emitter. ### Claim 2 (depends on 1) The signal receiver of claim 1, wherein the signal emitter corresponds to a device that generates and transmits an electromagnetic signal, and wherein detection of the signal emitter is indicative of whether a particular signal received at the receive circuitry is based at least in part on the electromagnetic signal. ### Claim 3 (depends on 1) The signal receiver of claim 1, wherein the signal emitter corresponds to a low probability of intercept (LPI) radio detection and ranging (RADAR) transmitter. ### Claim 4 (depends on 1) The signal receiver of claim 1, wherein the filter comprises an adaptive filter configured to perform a matching operation on the signal. ### Claim 5 (depends on 1) The signal receiver of claim 1, wherein the receive circuitry, the filter, and the processor are included on a single integrated circuit. ### Claim 6 (depends on 1) The signal receiver of claim 1, wherein the estimated system noise level is based on a thermal noise parameter associated with the receive circuitry. ### Claim 7 (depends on 1) The signal receiver of claim 1, wherein the estimated system noise level is based on a calibration measurement of noise from the receive circuitry without the receive circuitry receiving external stimulus. ### Claim 8 A signal receiver comprising: receive circuitry to receive a signal; a filter configured to generate sets of streaming output based on the signal, each set of streaming output comprising samples; and a processor coupled to the receive circuitry and configured to, for each set of streaming output: determine whether a signal to noise ratio for each sample satisfies a signal to noise threshold, the signal to noise ratio based on a magnitude of an in-phase and quadrature representation of each sample and based on an estimated system noise level of the receive circuitry; and detect a signal emitter based on at least a first number of samples in a particular number of consecutive samples satisfying the signal to noise threshold; and generate an indication of emitter detection based on detecting the signal emitter. ### Claim 9 (depends on 8) The signal receiver of claim 8, wherein the signal emitter corresponds to a device that generates and transmits an electromagnetic signal, and wherein detection of the signal emitter is indicative of whether a particular signal received by the receive circuitry is based at least in part on the electromagnetic signal. ### Claim 10 (depends on 8) The signal receiver of claim 8, wherein the signal emitter corresponds to a low probability of intercept (LPI) radio detection and ranging (RADAR) transmitter. ### Claim 11 (depends on 8) The signal receiver of claim 8, wherein the first number is less than half of the particular number. ### Claim 12 (depends on 8) The signal receiver of claim 8, wherein the receive circuitry, the filter, and the processor are included on a single integrated circuit. ### Claim 13 (depends on 8) The signal receiver of claim 8, wherein the estimated system noise level is based on a thermal noise parameter associated with the receive circuitry. ### Claim 14 (depends on 8) The signal receiver of claim 8, further comprising an antenna coupled to the receive circuitry. ### Claim 15 A method comprising: receiving, at a processor from a filter, sets of streaming output, each set of streaming output comprising samples; and for each set of samples: determining, at the processor, whether each sample satisfies a signal to noise threshold based on in-phase and quadrature representations of each sample and an estimated system noise level; detecting, at the processor, a signal emitter based on at least a first number of samples in a particular number of consecutive samples satisfying the signal to noise threshold; and generating, at the processor, an indication of emitter detection based on detecting the signal emitter. ### Claim 16 (depends on 15) The method of claim 15, wherein the signal emitter corresponds to a device that generates and transmits an electromagnetic signal. ### Claim 17 (depends on 16) The method of claim 16, wherein the signal emitter corresponds to a low probability of intercept (LPI) radio detection and ranging (RADAR) transmitter. ### Claim 18 (depends on 15) The method of claim 15, wherein the estimated system noise level is based on a thermal noise parameter associated with receive circuitry that provides a signal to the filter, wherein the filter generates the sets of streaming output based on the signal. ### Claim 19 (depends on 15) The method of claim 15, further comprising sending the indication to at least one of an alert system, a display system, and a remote processing center. ### Claim 20 (depends on 19) The method of claim 19, wherein the first number is less than half of the particular number.