A receiver that selectively samples a received signal in order to suppress an interference component of the signal while recovering a desired component. The selective sampling may be accomplished by low cost, low complex analog or digital circuitry. The receiver includes a first input that receives
A receiver that selectively samples a received signal in order to suppress an interference component of the signal while recovering a desired component. The selective sampling may be accomplished by low cost, low complex analog or digital circuitry. The receiver includes a first input that receives a first signal, including a desired signal component and an interference signal component and a second input that receives a second signal including the interference component only. The first and second signals are then provided to the sampling circuitry. First, the phase of the interference component of the both the first and second signals is aligned. Next, the points in a wave cycle that the second signal is at a power minimum are detected. Finally, first signal is sampled close to the point when the second signal is at the power minimum to recover the desired signal component and suppress the interference component.
대표청구항▼
What is claimed is: 1. A receiver system for selectively sampling a signal with two or more signal components, the receiver comprising: a first receive input for accessing a first signal, the first signal comprising a first desired signal component and an interference signal component; a second rec
What is claimed is: 1. A receiver system for selectively sampling a signal with two or more signal components, the receiver comprising: a first receive input for accessing a first signal, the first signal comprising a first desired signal component and an interference signal component; a second receive input for accessing a second signal, the second signal composed of the interference signal component; sampling circuitry coupled to the first and second receive inputs; wherein the sampling circuitry selectively samples the first signal by: aligning the phase of the interference components of the first and second signals; detecting when the interference component of the second signal is at a power minimum during a wave cycle; and sampling the first signal close to the points when the second signal is at a power minimum so as to recover the first desired signal component and suppress the interference signal component. 2. A receiver system in accordance with claim 1 further comprising: at least two antenna elements configured to measure a desired signal and an interference signal; a beam steering network configured to steer the desired signal near bore-site and the interference signal off bore-site; and a beam-forming network coupled to the beam steering network configured to produce a first signal comprising the sum of the desired signal and the interference signal, thereby producing a first signal with a desired and interference component, and a second signal comprising the difference of the interference signal and the desired signal, wherein at bore-site the desired signal is phased out leaving only the interference component, and configured to provide the first and second signals to the receiver system. 3. A receiver system in accordance with claim 1 further comprising: sampling circuitry configured to produce a quadrature signal; and a quadrature downconverter coupled to the sampling circuitry configured to down covert an in-phase and quadrature signal. 4. A receiver system in accordance with claim 1, wherein the first and second signals are one of a sine wave, a square wave, a triangular wave, a pulse, or any periodic waveform. 5. A receiver system in accordance with claim 1, wherein the sampling circuitry includes analog zero-crossing detectors, inverters, amplifiers, diodes, resistors and filters. 6. A receiver system in accordance with claim 1, wherein the sampling circuitry is comprised of digital circuit components. 7. A receiver system in accordance with claim 1 further comprising: a third receiver input for accessing the first signal; a fourth receive input for accessing a third signal, the third signal comprising an interference signal having a different phase than the second signal; sampling circuitry coupled to the third and fourth receive inputs; wherein the sampling circuitry selectively samples the first signal by: aligning the phase of the interference component of the first and third signals; detecting when the third signal is at a power minimum during a wave cycle; and sampling the first signal close to the points when the third signal is at a power minimum so as to recover the desired signal component and suppress the interference signal component of the first signal so as to increase the field of view that may be monitored by the receiver system. 8. A receiver system in accordance with claim 1, wherein the receiver system is used in a counter-counter measure system to block electronic counter measures. This includes any form of jamming whether accidental or intentional. 9. A receiver system in accordance with claim 1, wherein the receiver system is used in a tracking system to suppress decoy signals. 10. A receiver system in accordance with claim 1, wherein a squelch region is produced when the second signal is greater than the first signal. 11. A method for a receiver system to selectively sample a signal so as to suppress an interference component of the signal, the method comprising; accessing a first signal, wherein the first signal comprises a desired signal component and an interference signal component; accessing a second signal, either from an external source or from an internal source, wherein the second signal is comprised of only an interference component; aligning the phase of the interference components of both the first and second signals; determining when the interference component of the second signal is at a power minimum during a wave cycle; and sampling the first signal close to the points when the second signal is at a power minimum so as to recover the desired signal component and suppress the interference signal component. 12. A method in accordance with claim 11 further comprising: measuring a desired signal and an interference signal; beam steering the desired signal near bore-site and the interference signal to off bore-site; beam-forming the desired signal and the interference to produce a first signal comprising the sum of the desired signal and the interference signal, thereby producing a first signal with a desired and interference component, and a second signal comprising the difference of the interference signal and the desired signal, wherein at bore-site the desired signal is phased out leaving only the interference component; and providing the first and second signals to the receiver system. 13. A method in accordance with claim 11, wherein the first and second signals are one of a sine wave, a square wave, a triangular wave, a pulse, or any periodic waveform. 14. A method in accordance with claim 11, wherein sampling is accomplished by analog circuitry. 15. A method in accordance with claim 11, wherein sampling is accomplished by digital circuitry or algorithms. 16. A method in accordance with claim 11, wherein an algorithm is used. 17. A method in accordance with claim 11, wherein the receiver system adjusts in real time to changes in an interference environment. 18. A method in accordance with claim 11, wherein sampling is performed at least at the Nyquist sampling rate. 19. A method in accordance with claim 11, wherein the sampling method is used in a counter-counter measure system to block electronic counter measures or in a tracking system to suppress decoy signals. 20. A method in accordance with claim 11, wherein the selective sampling receiver is used in medical applications including an ultrasound, a hearing aid, and a magnetic resonance imaging (MRI) device. 21. A method in accordance with claim 11, wherein the selective sampling receiver is used in communication applications. 22. In a receiver system including a first signal, wherein the first signal comprises a desired signal component and an interference signal component, and a second signal, wherein the second signal is comprised of an interference signal component, a method for the receiver system to selectively-sample the first signal so as to suppress the interference signal component and recover the desired signal component, the method comprising; a step for selectively-sampling the first signal. 23. A method in accordance with claim 22, wherein the step for selectively sampling the first signal comprises the following: aligning the phase of the interference component of both the first and second signals; determining when the interference component of the second signal is at a power minimum during a wave cycle; and using the power minimum points of the second signal to trigger sampling of the first signal.
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이 특허에 인용된 특허 (3)
Hansen James P. (Fairfax VA), Coherent receiver phase and amplitude alignment circuit.
Kruys, Johannes; Rangarajan, Hari Narayanan; Rangarajan, Raghuram; Meil, Christopher, Adaptive sampling of radio frequency channels for radar detection.
Shirai, Hideki; Yamano, Chiharu; Natsume, Kazuma; Watanabe, Yuu; Sakamoto, Mai, Radar apparatus enabling simplified suppression of interference signal components which result from reception of directly transmitted radar waves from another radar apparatus.
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