PMCW—PMCW interference mitigation
First Claim
Patent Images
1. A radar sensing system for a vehicle, the radar sensing system comprising:
- a transmitter configured for installation and use on a vehicle, and configured to transmit radio signals on a selected carrier frequency, wherein the transmitted radio signals comprise phase modulated continuous wave radio signals;
a receiver configured for installation and use on the vehicle, and configured to receive radio signals that include transmitted radio signals transmitted by the transmitter and reflected from an object in an environment, wherein the receiver is further configured to correlate the received radio signals using a same spreading code as used by the transmitter;
a processor configured to control the transmitter to select a carrier frequency;
wherein the receiver is configured to receive interfering radio signals that include phase modulated radio signals transmitted by another radar sensing system, and wherein received interfering radio signals interfere with the received radio signals; and
wherein the processor is configured to control and alter, as necessary, the phase modulation of the transmitter such that the receiver avoids receiving the interfering radio signals.
1 Assignment
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Accused Products
Abstract
A radar sensing system for a vehicle includes a transmitter, a receiver, and a processor. The transmitter is configured to transmit a radio signal. The receiver is configured to receive a radio signal which includes the transmitted radio signal reflected from an object in the environment. The receiver is also configured to receive an interfering radio signal transmitted by a transmitter of another radar sensing system. The processor is configured to control the transmitter to mitigate or avoid interference from the other radar sensing system.
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Citations
28 Claims
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1. A radar sensing system for a vehicle, the radar sensing system comprising:
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a transmitter configured for installation and use on a vehicle, and configured to transmit radio signals on a selected carrier frequency, wherein the transmitted radio signals comprise phase modulated continuous wave radio signals; a receiver configured for installation and use on the vehicle, and configured to receive radio signals that include transmitted radio signals transmitted by the transmitter and reflected from an object in an environment, wherein the receiver is further configured to correlate the received radio signals using a same spreading code as used by the transmitter; a processor configured to control the transmitter to select a carrier frequency; wherein the receiver is configured to receive interfering radio signals that include phase modulated radio signals transmitted by another radar sensing system, and wherein received interfering radio signals interfere with the received radio signals; and wherein the processor is configured to control and alter, as necessary, the phase modulation of the transmitter such that the receiver avoids receiving the interfering radio signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17)
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15. A radar sensing system for a vehicle, the radar sensing system comprising:
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a transmitter configured for installation and use on a vehicle, and configured to transmit radio signals on a selected carrier frequency, wherein the transmitted radio signals are phase modulated continuous wave radio signals; a receiver configured for installation and use on the vehicle, and configured to receive radio signals that include transmitted radio signals transmitted by the transmitter and reflected from an object in an environment; a processor configured to control the transmitter to select a carrier frequency; wherein the receiver is configured to receive interfering radio signals that include radio signals transmitted by another radar sensing system, and wherein received interfering radio signals interfere with the received radio signals; wherein the processor is configured to control the transmitter such that the receiver avoids receiving the interfering radio signals; wherein the processor is configured to mitigate or avoid the interfering radio signals; and wherein the transmitter is further configured to phase modulate the radio signals for transmission according to a spreading code, and wherein the receiver is further configured to correlate the received radio signals using the same spreading code as used by the transmitter, and wherein the receiver is further configured to also correlate the received radio signals with a spreading code that is different from the spreading code used by the transmitter, such that the receiver determines correlation values for the received interfering radio signals without the received radio signal, and wherein the determined correlation values are processed by the processor to determine interference levels corresponding to each carrier frequency of the plurality of carrier frequencies.
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16. A radar sensing system for a vehicle, the radar sensing system comprising:
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a transmitter configured for installation and use on a vehicle, and configured to transmit radio signals on a selected carrier frequency, wherein the transmitted radio signals are phase modulated continuous wave radio signals; a receiver configured for installation and use on the vehicle, and configured to receive radio signals that include transmitted radio signals transmitted by the transmitter and reflected from an object in an environment; a processor configured to control the transmitter to select a carrier frequency; wherein the receiver is configured to receive interfering radio signals that include radio signals transmitted by another radar sensing system, and wherein received interfering radio signals interfere with the received radio signals; wherein the processor is configured to control the transmitter such that the receiver avoids receiving the interfering radio signals; wherein the processor is configured to mitigate or avoid the interfering radio signals; and wherein the transmitter is further configured to phase modulate the radio signals for transmission according to an aperiodic spreading code, and wherein the receiver is further configured to measure a noise floor of the received radio signals, and wherein the processor is further configured to switch the transmitter to a periodic spreading code when the noise floor increases above a threshold, and wherein both radar sensing systems have the same period.
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18. A radar sensing system for a vehicle, the radar sensing system comprising:
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a transmitter configured for installation and use on a vehicle, and configured to transmit radio signals, wherein the transmitted radio signals comprise phase modulated continuous wave radio signals, and wherein the transmitted radio signals are phase modulated according to a spreading code; a receiver configured for installation and use on the vehicle, and configured to receive radio signals that include transmitted radio signals transmitted by the transmitter and reflected from an object in an environment, wherein the receiver is further configured to correlate the received radio signals using the same spreading code as used by the transmitter; a processor configured to select the spreading code from a plurality of spreading codes; wherein the receiver is configured to receive interfering radio signals that include phase modulated radio signals transmitted by another radar sensing system, and wherein received interfering radio signals interfere with the received radio signals; and wherein the processor is configured to mitigate or avoid the interfering radio signals in part by selecting a particular spreading code for phase modulating the transmitted radio signals. - View Dependent Claims (19, 20, 21, 22, 24)
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23. A radar sensing system for a vehicle, the radar sensing system comprising:
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a transmitter configured for installation and use on a vehicle, and configured to transmit radio signals, wherein the transmitted radio signals are phase modulated continuous wave radio signals, and wherein the transmitted radio signals are phase modulated according to a spreading code; a receiver configured for installation and use on the vehicle, and configured to receive radio signals that include transmitted radio signals transmitted by the transmitter and reflected from an object in an environment; a processor configured to select the spreading code from a plurality of spreading codes; wherein the receiver is configured to receive interfering radio signals that include radio signals transmitted by another radar sensing system, and wherein received interfering radio signals interfere with the received radio signals; wherein the processor is configured to mitigate or avoid the interfering radio signals in part by selecting a particular spreading code; and wherein the receiver is further configured to correlate the received radio signals with a spreading code that is different from any spreading code that is used by the transmitter, such that the receiver determines correlation values for the received interfering radio signals without the received radio signals, and wherein the correlation values are measured by the processor to determine the interference levels.
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25. A method for mitigating interference in a radar sensing system comprising a transmitter configured for installation and use on a vehicle and a receiver configured for installation and use on the vehicle, the method comprising:
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selectively transmitting, with the transmitter, a radio signal, wherein the transmitted radio signal comprises a phase modulated continuous wave radio signal; receiving, with the receiver, a radio signal, wherein the received radio signal includes the transmitted radio signal transmitted by the transmitter and reflected from an object in an environment, and wherein the receiver correlates the received radio signals using a same spreading code as used by the transmitter; receiving, with the receiver, an interfering phase modulated radio signal transmitted by another radar sensing system, wherein the received interfering radio signal interferes with the received radio signal; and mitigating or avoiding the interfering radio signal by controlling the selective transmission of the transmitted radio signal, and by controlling and altering, as necessary, the phase modulation of the transmitted radio signal. - View Dependent Claims (26, 27, 28)
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Specification