Radar apparatus with a simplified construction
First Claim
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1. A radar apparatus, comprising:
- an oscillator that generates a frequency modulated signal;
a reception mixer, coupled to said oscillator, that generates an IF signal by mixing the frequency modulated signal and a received signal formed by the frequency modulated signal reflected from a target, the IF signal indicating a distance to the target and a relative speed of the target; and
an antenna that alternatingly transmits the frequency modulated signal in a transmission mode and receives the received signal in a reception mode, said antenna alternating between the transmission mode and the reception mode in accordance with a drive signal.
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Abstract
A single antenna is used so that time-division transmission and reception is carried out in a radar apparatus for obtaining a distance and a relative speed with respect to a target object based on a beat signal obtained by transmitting a frequency modulated signal and mixing a received signal reflected by said target object with the frequency modulated signal that is transmitted.
89 Citations
16 Claims
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1. A radar apparatus, comprising:
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an oscillator that generates a frequency modulated signal; a reception mixer, coupled to said oscillator, that generates an IF signal by mixing the frequency modulated signal and a received signal formed by the frequency modulated signal reflected from a target, the IF signal indicating a distance to the target and a relative speed of the target; and an antenna that alternatingly transmits the frequency modulated signal in a transmission mode and receives the received signal in a reception mode, said antenna alternating between the transmission mode and the reception mode in accordance with a drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radar apparatus, comprising:
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an oscillator that generates a frequency modulated signal; a reception mixer, coupled to said oscillator, that generates an IF signal by mixing the frequency modulated signal and a received signal formed by the frequency modulated signal reflected from a target, the IF signal indicating a distance to the target and a relative speed of the target; a second mixer that generates a beat signal in accordance with a drive signal and the IF signal; and an antenna that alternatingly transmits the frequency modulated signal in a transmission mode and receives the received signal in a reception mode, said antenna alternating between the transmission mode and the reception mode in accordance with the drive signal. - View Dependent Claims (11, 12)
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13. A radar apparatus, comprising:
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an oscillator that generates a frequency modulated signal; a reception mixer, coupled to said oscillator, that generates an IF signal by mixing the frequency modulated signal and a received signal formed by the frequency modulated signal reflected from a target, the IF signal indicating a distance to the target and a relative speed of the target; an antenna that alternatingly transmits the frequency modulated signal in a transmission mode and receives the received signal in a reception mode, said antenna alternating between the transmission mode and the reception mode in accordance with a drive signal; and an interference detection unit, coupled to said reception mixer, that detects in the received signal an interfering signal received from another radar apparatus. - View Dependent Claims (14)
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15. A radar apparatus comprising:
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an oscillator that generates a frequency modulated signal; a reception mixer, coupled to said oscillator, that generates an IF signal by mixing the frequency modulated signal and a received signal reflected from a target, the IF signal indicating a distance to the target and a relative speed of the target; an interference detection unit, coupled to said reception mixer, that detects in the received signal an interfering signal received from another radar apparatus; a first antenna that transmits the frequency modulated signal; and a second antenna that receives the received signal.
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16. A speed and range detecting method, comprising the steps of:
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alternatingly transmitting a frequency modulated signal and receiving, as a received signal, the frequency modulated signal reflected from a target; and mixing the frequency modulated signal and the received signal to generate an IF signal indicating a distance to the target and a relative speed of the target.
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Specification