Portable FM-CW radar device with frequency conversion by first and second frequencies
First Claim
1. A portable FM-CW radar device with transmit and receive antennas, comprising:
- a transmitting oscillator operatively coupled to the transmit antenna to transmit a modulated high frequency transmit signal at a first frequency from the transmit antenna in range of a target object so that a reflected signal is reflected by the target object;
modulation signal generating means for generating a second frequency which is far lower than the first frequency and twice as much as a Doppler frequency generated by a sum or difference of a relative velocity of the reflected signal and the transmit signal and a beat frequency generated by a sum or difference of the propagation delay time of the reflected signal and the transmit signal;
a modulator operatively connected between said transmitting oscillator and the transmit antenna to modulate the transmit signal;
first frequency converting means for frequency modulating the reflected signal reflected by the target object with the first frequency; and
second frequency converting means for frequency modulating the reflected signal with the second frequency.
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Accused Products
Abstract
A FM-CW radar device is provided for frequency-modulating a high frequency signal with a modulation signal, transmitting the modulated high frequency signal, receiving a signal reflected by a target object and frequency-modulating the reflection signal with a signal generated by a local oscillator signal source provided by branching a portion of the transmitting signal. A modulator is disposed between a radar transmitting section and a transmitting antenna. The modulator modulates the transmitting signal with a second frequency which is far lower than the radar transmitting frequency and twice as much as the sum or the difference of a Doppler frequency generated by a relative propagation velocity and a beat frequency generated by a propagation delay time. A first frequency converter frequency modulates the received signal reflected by the target object with the local oscillator. A second frequency converter frequency modulates the received signal with the second frequency, the second frequency being far lower than the radar transmitting frequency and twice as much as the sum or the difference of a Doppler frequency generated by a relative propagation velocity and a beat frequency generated by a propagation delay time.
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Citations
32 Claims
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1. A portable FM-CW radar device with transmit and receive antennas, comprising:
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a transmitting oscillator operatively coupled to the transmit antenna to transmit a modulated high frequency transmit signal at a first frequency from the transmit antenna in range of a target object so that a reflected signal is reflected by the target object; modulation signal generating means for generating a second frequency which is far lower than the first frequency and twice as much as a Doppler frequency generated by a sum or difference of a relative velocity of the reflected signal and the transmit signal and a beat frequency generated by a sum or difference of the propagation delay time of the reflected signal and the transmit signal; a modulator operatively connected between said transmitting oscillator and the transmit antenna to modulate the transmit signal; first frequency converting means for frequency modulating the reflected signal reflected by the target object with the first frequency; and second frequency converting means for frequency modulating the reflected signal with the second frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 32)
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13. A portable FM-CW radar device with transmit and receive antennas, comprising:
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a transmitting oscillator operatively coupled to the transmit antenna to transmit a modulated high frequency transmit signal at a first frequency from the transmit antenna in range of a target object so that a reflected signal is reflected by the target object; modulation signal generating means for generating a second frequency which is far lower than the first frequency and a twice as much as a Doppler frequency generated by a sum or difference of a relative velocity of the reflected signal and the transmit signal and a beat frequency generated by a sum or difference of the propagation delay time of the reflected signal and the transmit signal; a modulator operatively coupled to the receive antenna to modulate the reflected signal to produce a modulated reflected signal; first frequency converting means for frequency modulating the modulated reflected signal with the first frequency; and second frequency converting means for frequency modulating the modulated reflected signal with the second frequency.
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22. A portable FM-CW radar device with transmit and receive antennas, comprising:
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a transmitting oscillator operatively coupled to the transmit antenna to transmit a modulated high frequency transmit signal at a first frequency from the transmit antenna in range of a target object so that a reflected signal is reflected by the target object; modulation signal generating means for generating a second frequency which is far lower than the first frequency and twice as much as a Doppler frequency generated by a sum or difference of a relative velocity of the reflected signal and the transmit signal and a beat frequency generated by a sum or difference of the propagation delay time of the reflected signal and the transmit signal; a modulator operatively connected between said transmitting oscillator and the transmit antenna to modulate the transmit signal a switching circuit operatively coupled to the receive antenna to switch the reflected signal to produce a modulated reflected signal; first frequency converting means for frequency modulating the modulated reflected signal reflected by the target object with the first frequency; and second frequency converting means for frequency modulating the modulated reflected signal with the second frequency. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification