Apparatus and method for attenuating close-range radar signals with balancing for dual-frequency difference in radar signals in an automotive radar sensor
First Claim
1. A radar system, comprising:
- a radar signal transmitter for transmitting transmitted radar signals into a region, a first transmitted radar signal having a first frequency and a second transmitted radar signal having a second frequency different from the first frequency;
a receiver for receiving reflected radar signals generated by reflection of the transmitted radar signals and generating receive signals indicative of the reflected radar signals, a first receive signal being indicative of a first reflected radar signal generated by reflection of the first transmitted radar signal, and a second receive signal being indicative of a second reflected radar signal generated by reflection of the second transmitted radar signal; and
a processor configured to;
(a) receive the first and second receive signals, (b) compute a difference between the first and second receive signals to generate a difference signal, (c) process the difference signal to provide radar information for the region, and adjust at least one of amplitude and phase of at least one of the first and second receive signals such that the difference is optimized at a preselected range from the receiver.
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Accused Products
Abstract
A radar signal transmitter transmits first and second radar signals at different first and second frequencies. A radar receiver receives reflected radar signals and generates receive signals indicative of the reflected radar signals. A first receive signal is indicative of a first reflected radar signal generated by reflection of the first transmitted radar signal, and a second receive signal is indicative of a second reflected radar signal generated by reflection of the second transmitted radar signal. A processor receives the first and second receive signals and computes a difference between the first and second receive signals to generate a difference signal. The processor processes the difference signal to provide radar information for the region, the processor adjusting at least one of amplitude and phase of at least one of the first and second receive signals such that the difference is optimized at a preselected range from the receiver.
13 Citations
32 Claims
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1. A radar system, comprising:
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a radar signal transmitter for transmitting transmitted radar signals into a region, a first transmitted radar signal having a first frequency and a second transmitted radar signal having a second frequency different from the first frequency; a receiver for receiving reflected radar signals generated by reflection of the transmitted radar signals and generating receive signals indicative of the reflected radar signals, a first receive signal being indicative of a first reflected radar signal generated by reflection of the first transmitted radar signal, and a second receive signal being indicative of a second reflected radar signal generated by reflection of the second transmitted radar signal; and a processor configured to;
(a) receive the first and second receive signals, (b) compute a difference between the first and second receive signals to generate a difference signal, (c) process the difference signal to provide radar information for the region, and adjust at least one of amplitude and phase of at least one of the first and second receive signals such that the difference is optimized at a preselected range from the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A radar processing method, comprising:
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transmitting radar signals into a region, a first transmitted radar signal having a first frequency and a second transmitted radar signal having a second frequency different from the first frequency; receiving reflected radar signals generated by reflection of the transmitted radar signals and generating receive signals indicative of the reflected radar signals, a first receive signal being indicative of a first reflected radar signal generated by reflection of the first transmitted radar signal, and a second receive signal being indicative of a second reflected radar signal generated by reflection of the second transmitted radar signal; and processing the first and second receive signals, said processing comprising;
(a) receiving the first and second receive signals, (b) computing a difference between the first and second receive signals to generate a difference signal, (c) processing the difference signal to provide radar information for the region, and adjusting at least one of amplitude and phase of at least one of the first and second receive signals such that the difference is optimized at a preselected range from the receiver. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification