# US 12,009,915 B2 · Compact receiver system with antijam and antispoof capability > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,915 B2 - Document ID: US12009915B2 - Status: Granted - Kind: B2 - Application number: 17/590,903 - Filed: 2022-02-02 - Published: 2022-08-04 - Granted: 2024-06-11 - Earliest claimed: 2021-01-29 - Assignees: Eagle Technology, LLC - Applicants: Eagle Technology, LLC - Inventors: Francis E. Parsche; Kenneth J. Hendrickson - Web page: https://patentgrep.com/patent/US12009915B2 ## CPC - H04K 3/22: {including jamming detection and monitoring} - H04K 3/228: {Elimination in the received signal of jamming or of data corrupted by jamming (interference suppression in receivers H04B1/10)} - H04K 3/65: {using deceptive jamming or spoofing, e.g. transmission of false signals for premature triggering of RCIED, for forced connection or disconnection to/from a network or for generation of dummy target signal} - H04K 3/90: {related to allowing or preventing navigation or positioning, e.g. GPS} - H04K 2203/32: including a particular configuration of antennas - H04K: SECRET COMMUNICATION; JAMMING OF COMMUNICATION ## Abstract A signal-of-interest is received by using a first and second planar electrically conductive disc to define an antenna. The antenna produces RF signal outputs at three output ports Ex, Ey and Ez, each having a different associated gain pattern and polarization response. At least one null is automatically asserted in a pattern defined by the antenna in a specified direction by selectively weighting a gain and a phase of the RF signals respectively produced from the three output ports and then combining the RF signals to produce a first receiver signal output. ## Claims ### Claim 1 A method for selectively receiving a signal-of-interest, comprising: using a first planar electrically conductive disc and a second planar electrically conductive disc concentric to and spaced apart from the first planar electrically conductive disc, to define an antenna which produces RF signal outputs at three output ports Ex, Ey and Ez, each having a different associated gain pattern and polarization response; automatically asserting at least one null in a pattern defined by the antenna in a specified direction by selectively modifying a gain and a phase of the RF signals respectively produced from the three output ports in accordance with a first set of weighting parameters to obtain a first plurality of weighted RF signals, and then combining the first plurality of weighted RF signals to produce a first receiver signal output. ### Claim 2 (depends on 1) The method of claim 1, wherein the specified direction of the null is automatically calculated based on a determination that a signal source aligned in the specified direction is a jammer or spoofer. ### Claim 3 (depends on 2) The method of claim 2, wherein the determination that the signal source aligned in the specified direction is a jammer is based on a relative magnitude of a received signal level as compared to a noise floor. ### Claim 4 (depends on 2) The method of claim 2, further comprising communicating the first receiver signal output to a primary receiver system which is configured to process precision navigation and timing (PNT) signals. ### Claim 5 (depends on 2) The method of claim 2, further comprising automatically asserting at least one antenna pattern beam defined by the antenna in the specified direction by selectively modifying a gain and a phase of the RF signals output from the three output ports in accordance with a second set of weighting parameters to produce second plurality of weighted RF signals, and then combining the second plurality of weighted RF signals to produce a second receiver signal output. ### Claim 6 (depends on 5) The method of claim 5, wherein the specified direction is automatically calculated based on a preliminary determination that a signal source aligned in the specified direction is a jammer or spoofer. ### Claim 7 (depends on 5) The method of claim 5, further comprising communicating the second receiver signal output to a secondary receiver system which is configured to process PNT signals. ### Claim 8 (depends on 7) The method of claim 7, further comprising adding a noise signal to the second receiver signal output that is communicated to the secondary receiver system to increase a signal-to-noise ratio. ### Claim 9 (depends on 7) The method of claim 7, further comprising classifying the second receiver signal output as a jammer signal if it cannot be demodulated by the secondary receiver system. ### Claim 10 (depends on 7) The method of claim 7, further comprising using the secondary receiver system to determine an identity of a specified satellite which is the purported source of the second receiver signal. ### Claim 11 (depends on 10) The method of claim 10, further comprising using the identity of the specified satellite to determine an expected angle-of-arrival at the antenna of signals from the specified satellite. ### Claim 12 (depends on 11) The method of claim 11, further comprising comparing the expected angle-of-arrival to a measured or estimated angle-of-arrival of received RF signals comprising the second receiver signal. ### Claim 13 An antijam antispoofing precision timing and navigation (PNT) system, comprising: an antenna including a first planar electrically conductive disc and a second planar electrically conductive disc concentric to and spaced apart from the first planar electrically conductive disc, the antenna including three output ports Ex, Ey and Ez each having a different associated gain pattern and polarization response; a signal processing system coupled to the antenna configured to assert at least one null in a pattern defined by the antenna in a specified direction by selectively modifying a gain and a phase of RF signals respectively produced from the three output ports in accordance with a first set of weighting parameters to produce a first plurality of weighted RF signals, and combining the first plurality of weighted RF signals to produce a first receiver signal output. ### Claim 14 (depends on 13) The system of claim 13, wherein the signal processing system is configured to automatically calculate the specified direction of the null based on a determination that a signal source aligned in the specified direction is a jammer or spoofer. ### Claim 15 (depends on 14) The system of claim 14, wherein signal processing system is configured to determine that the signal source aligned in the specified direction is a jammer based on a relative magnitude of a received signal level as compared to a noise floor. ### Claim 16 (depends on 14) The system of claim 14, wherein the first receiver signal output is coupled to a primary receiver system which is configured to process precision navigation and timing (PNT) signals. ### Claim 17 (depends on 14) The system of claim 14, wherein the signal processing system is configured to automatically assert at least one antenna pattern beam defined by the antenna in the specified direction by selectively modifying a gain and a phase of the RF signals output from the three output ports in accordance with a second set of weighting parameters to produce second plurality of weighted RF signals, and then combine the second plurality of weighted RF signals to produce a second receiver signal output. ### Claim 18 (depends on 17) The system of claim 17, wherein the signal processing system is configured to automatically calculate the specified direction based on a preliminary determination that a signal source aligned in the specified direction is a jammer or spoofer. ### Claim 19 (depends on 17) The system of claim 17, wherein the second receiver signal output is coupled to a secondary receiver system which is configured to process PNT signals. ### Claim 20 (depends on 19) The system of claim 19, wherein the signal processing system is configured to add a noise signal to the second receiver signal output that is coupled to the secondary receiver system to increase a signal-to-noise ratio. ### Claim 21 (depends on 19) The system of claim 19, wherein the signal processing system is configured to automatically classify the second receiver signal output as a jammer signal if the second receiver signal output cannot be demodulated by the secondary receiver system. ### Claim 22 (depends on 19) The system of claim 19, wherein the signal processing system is configured to use the secondary receiver system to determine an identity of a specified satellite which is the purported source of the second receiver signal. ### Claim 23 (depends on 22) The system of claim 22, wherein the signal processing system is configured to use the identity of the specified satellite to determine an expected angle-of-arrival at the antenna of signals from the specified satellite. ### Claim 24 (depends on 23) The system of claim 23, wherein the signal processing system is configured to compare the expected angle-of-arrival to a measured or estimated angle-of-arrival of received RF signals comprising the second receiver signal.