# US 10,481,273 B1 · Systems and methods for GNSS processing during interference suppression > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,273 B1 - Document ID: US10481273B1 - Status: Granted - Kind: B1 - Application number: 15/804,996 - Filed: 2017-11-06 - Granted: 2019-11-19 - Earliest claimed: 2017-11-06 - Assignees: Rockwell Collins, Inc. - Applicants: Rockwell Collins, Inc. - Inventors: Karl W. Ulmer - Web page: https://patentgrep.com/patent/US10481273B1 ## CPC - G01S 19/21: Interference related issues {; Issues related to cross-correlation, spoofing or other methods of denial of service} - H04B 1/711: the interference being multi-path interference - H04B 1/71: the interference being narrowband interference - H04B 2201/709718: Determine interference - 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 - H04B: TRANSMISSION ## Abstract A receiver device includes a radio frequency receiver and a processing circuit. The radio frequency receiver receives an incoming signal including a radio frequency satellite signal. The processing circuit is configured to generate a calibration signal, apply the calibration signal to the incoming signal to generate a calibrated incoming signal, execute an interference suppression algorithm on the calibrated incoming signal to generate a suppressed calibrated incoming signal, execute a tracking channel using the suppressed calibrated incoming signal to generate a suppressed calibrated pseudorange parameter, compare the suppressed calibrated pseudorange parameter to a predetermined calibrated pseudorange parameter to determine an interference suppression error, execute the interference suppression algorithm on the incoming signal to generate a suppressed incoming signal, execute a tracking channel using the suppressed incoming signal to generate a satellite pseudorange parameter, modify the satellite pseudorange parameter using the interference suppression error, and output a location of the receiver device. ## Claims ### Claim 1 A receiver device, comprising: a radio frequency receiver configured to receive an incoming signal, the incoming signal including a radio frequency (RF) satellite signal from a satellite vehicle; and a processing circuit configured to: generate a calibration signal; apply the calibration signal to the incoming signal to generate a calibrated incoming signal; execute an interference suppression algorithm on the calibrated incoming signal to generate a suppressed calibrated incoming signal; execute a first tracking channel using the suppressed calibrated incoming signal to generate a suppressed calibrated pseudorange parameter; compare the suppressed calibrated pseudorange parameter to a predetermined calibrated pseudorange parameter to determine an interference suppression error; execute the interference suppression algorithm on the incoming signal to generate a suppressed incoming signal; execute a second tracking channel corresponding to the satellite vehicle using the suppressed incoming signal to generate a satellite pseudorange parameter; modify the satellite pseudorange parameter using the interference suppression error; and output a location of the receiver device based on the modified satellite pseudorange parameter. ### Claim 2 (depends on 1) The receiver device of claim 1, wherein each pseudorange parameter includes at least one of a code position parameter or a carrier phase parameter. ### Claim 3 (depends on 1) The receiver device of claim 1, wherein the processing circuit is configured to determine the predetermined calibrated pseudorange parameter by executing a third tracking channel by correlating the calibrated incoming signal with a calibration code corresponding to the calibration signal. ### Claim 4 (depends on 1) The receiver device of claim 1, wherein the processing circuit is configured to execute the interference suppression algorithm to counteract jamming of the satellite signal. ### Claim 5 (depends on 4) The receiver device of claim 4, wherein the processing circuit is configured to execute the interference suppression algorithm using at least one of a frequency excision algorithm, time domain filtering, amplitude domain processing, wavelet domain excision, or space-time adaptive processing to suppress at least one of matched spectrum jammers, multiple narrow band jammers, partial band jammers, or swept jammers. ### Claim 6 (depends on 1) The receiver device of claim 1, wherein the pseudorange parameter includes a code position parameter, and executing the second tracking channel includes correlating the suppressed incoming signal with a local pseudo random noise code corresponding to the satellite vehicle. ### Claim 7 (depends on 1) The receiver device of claim 1, wherein modifying the satellite pseudorange parameter using the interference suppression error reduces an error of the satellite pseudorange parameter. ### Claim 8 (depends on 1) The receiver device of claim 1, wherein the calibration signal has a signal strength greater than a first threshold corresponding to a desired signal to noise ratio for the calibration signal and less than a second threshold associated with interference in correlating the satellite signal of the incoming signal with a local signal. ### Claim 9 (depends on 1) The receiver device of claim 1, wherein the calibration signal is spectrally similar to a global navigation and satellite system (GNSS) signal corresponding to the satellite vehicle. ### Claim 10 (depends on 1) The receiver device of claim 1, wherein the satellite vehicle is at least one of a global positioning system (GPS) vehicle or a global navigation satellite system (GNSS) vehicle. ### Claim 11 A method, comprising: receiving an incoming signal, the incoming signal including a radio frequency (RF) satellite signal from a satellite vehicle; generating a calibration signal; applying the calibration signal to the incoming signal to generate a calibrated incoming signal; executing an interference suppression algorithm on the calibrated incoming signal to generate a suppressed calibrated incoming signal; executing a first tracking channel using the suppressed calibrated incoming signal to generate a suppressed calibrated pseudorange parameter; comparing the suppressed calibrated pseudorange parameter to a predetermined calibrated pseudorange parameter to determine an interference suppression error; executing the interference suppression algorithm on the incoming signal to generate a suppressed incoming signal; executing a second tracking channel corresponding to the satellite vehicle using the suppressed incoming signal to generate a satellite pseudorange parameter; modifying the satellite pseudorange parameter using the interference suppression error; and outputting a location of a receiver device based on the modified satellite pseudorange parameter. ### Claim 12 (depends on 11) The method of claim 11, wherein each pseudorange parameter includes at least one of a code position parameter or a carrier phase parameter. ### Claim 13 (depends on 11) The method of claim 11, further comprising determining the predetermined calibrated pseudorange parameter by executing a third tracking channel using a calibration code corresponding to the calibration signal and the calibrated incoming signal. ### Claim 14 (depends on 11) The method of claim 11, wherein executing the interference suppression algorithm includes executing at least one of a frequency excision algorithm, time domain filtering, amplitude domain processing, wavelet domain excision, or space-time adaptive processing to suppress at least one of matched spectrum jammers, multiple narrow band jammers, partial band jammers, or swept jammers. ### Claim 15 (depends on 11) The method of claim 11, wherein the pseudorange parameter includes a code position parameter, and executing the second tracking channel includes correlating the suppressed incoming signal with a local pseudo random noise signal corresponding to the satellite vehicle. ### Claim 16 (depends on 11) The method of claim 11, wherein the calibration signal has a signal strength greater than a first threshold corresponding to a desired signal to noise ratio for the calibration signal and less than a second threshold associated with interference in correlating the satellite signal of the incoming signal with a local signal, the second threshold greater than the first threshold. ### Claim 17 An airborne platform, comprising: a satellite receiver associated with an antenna configured to receive an incoming signal, the incoming signal including a radio frequency (RF) satellite signal from a satellite vehicle, the satellite receiver including a processing circuit configured to: generate a calibration signal; apply the calibration signal to the incoming signal to generate a calibrated incoming signal; execute an interference suppression algorithm on the calibrated incoming signal to generate a suppressed calibrated incoming signal; execute a first tracking channel using the suppressed calibrated incoming signal to generate a suppressed calibrated pseudorange parameter; compare the suppressed calibrated pseudorange parameter to a predetermined calibrated pseudorange parameter to determine an interference suppression error; execute the interference suppression algorithm on the incoming signal to generate a suppressed incoming signal; execute a second tracking channel corresponding to the satellite vehicle using the suppressed incoming to generate a satellite pseudorange parameter; modify the satellite pseudorange parameter using the interference suppression error; and output a location of the satellite receiver based on the modified satellite pseudorange parameter. ### Claim 18 (depends on 17) The airborne platform of claim 17, further comprising a navigation system configured to receive the location of the satellite receiver and at least one of (1) display the location or (2) update navigation instructions based on the location. ### Claim 19 (depends on 17) The airborne platform of claim 17, wherein the satellite vehicle is at least one of a global positioning system (GPS) vehicle or a global navigation satellite system (GNSS) vehicle. ### Claim 20 (depends on 17) The airborne platform of claim 17, further comprising a targeting system configured to generate targeting instructions for movement of an object, wherein the targeting system updates the targeting instructions based on the location.