Method and device for continuous wave radar measurements
First Claim
1. A method for determining at least one of a distance and a relative velocity by means of continuous wave radar measurements, comprising:
- generating a measurement signal in the form of a continuous wave radar signal;
transmitting the measurement signal by means of an antenna;
reflecting the measurement signal by means of a reflector, thereby providing a desired reflected measurement signal;
receiving the desired reflected measurement signal; and
determining at least one of a distance and a relative velocity between the antenna and the reflector by means of the desired reflected measurement signal,whereinsaid reflecting the measurement signal comprising asymmetrically modulating the measurement signal at the reflector, comprising applying a modulation signal which alternates between a first state and a second state, the first state having a first duration, and the second state having a second duration, the first duration differing from the second duration;
said determining at least one of a distance and a relative velocity comprising identifying the desired reflected measurement signal, among several received reflections of the measurement signal, by means of the asymmetric modulation; and
said determining at least one of a distance and a relative velocity comprising detecting and sampling the desired reflective measurement signal in a way that generates samples which generally follow two sinusoidal curves, one for each of said first and second states, determining which sinusoidal curve represents which state by means of the first and second durations, choosing one of the sinusoidal curves for the determination of at least one of a distance and a velocity, and using information from several consecutive periods of the sinusoidal curve and knowledge about which state it represents for that determination.
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Accused Products
Abstract
This invention relates to a method for determining at least one of a distance and a relative velocity by means of continuous wave radar measurements. The method includes generating a measurement signal in the form of a continuous wave radar signal; transmitting the measurement signal by means of an antenna (112); reflecting the measurement signal by means of a reflector (118), thereby providing a desired reflected measurement signal; receiving the desired reflected measurement signal; and determining at least one of a distance and a relative velocity between the antenna and the reflector by means of the desired reflected measurement signal. The reflection of the measurement signal involves asymmetrically modulating the measurement signal at the reflector. The determination of at least one of a distance and a relative velocity includes detecting the desired reflected measurement signal among several received reflections of the measurement signal, by means of information added by the asymmetric modulation.
41 Citations
12 Claims
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1. A method for determining at least one of a distance and a relative velocity by means of continuous wave radar measurements, comprising:
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generating a measurement signal in the form of a continuous wave radar signal; transmitting the measurement signal by means of an antenna; reflecting the measurement signal by means of a reflector, thereby providing a desired reflected measurement signal; receiving the desired reflected measurement signal; and determining at least one of a distance and a relative velocity between the antenna and the reflector by means of the desired reflected measurement signal, wherein said reflecting the measurement signal comprising asymmetrically modulating the measurement signal at the reflector, comprising applying a modulation signal which alternates between a first state and a second state, the first state having a first duration, and the second state having a second duration, the first duration differing from the second duration; said determining at least one of a distance and a relative velocity comprising identifying the desired reflected measurement signal, among several received reflections of the measurement signal, by means of the asymmetric modulation; and said determining at least one of a distance and a relative velocity comprising detecting and sampling the desired reflective measurement signal in a way that generates samples which generally follow two sinusoidal curves, one for each of said first and second states, determining which sinusoidal curve represents which state by means of the first and second durations, choosing one of the sinusoidal curves for the determination of at least one of a distance and a velocity, and using information from several consecutive periods of the sinusoidal curve and knowledge about which state it represents for that determination. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for determining at least one of a distance and a relative velocity by means of continuous wave radar measurements, comprising a transceiver device and a reflector device, wherein the transceiver device comprises:
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a measurement signal generator, arranged to generate a measurement signal in the form of a continuous wave radar signal; and a transmitter, arranged to transmit the measurement signal, wherein the reflector device comprises; a reflector, arranged to reflect the transmitted measurement signal; and a modulator for modulating the measurement signal in conjunction with reflecting it, thereby providing a desired reflected measurement signal, wherein the transceiver device further comprises; a receiver, arranged to receive the desired reflected measurement signal; and a controller, arranged to determine at least one of a distance and a relative velocity between the transmitter and the reflector, wherein; the modulator is arranged to asymmetrically modulate the measurement signal, wherein the reflector device comprises a modulator controller arranged to switch the modulator between a first state and a second state, the first state having a first duration, and the second state having a second duration, the first duration differing from the second duration; the controller is arranged to identify the desired reflected measurement signal, among several received reflections of the measurement signal, by means of the asymmetric modulation; the transceiver device further comprises a detector connected with the controller, wherein the detector is arranged to detect and sample the desired reflected measurement signal in a way that generates samples which generally follow two sinusoidal curves, one for each of said first and second states; and wherein the controller is arranged to determine which sinusoidal curve represents which state by means of the first and second durations, to choose one of the sinusoidal curves for the determination of at least one of a distance and a velocity, and to use information from several consecutive periods of the sinusoidal curve and knowledge about which state it represents for that determination. - View Dependent Claims (9, 10, 11, 12)
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Specification