EP0527443A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Portable FM-CW radar device
Assignee: Denso Ten Ltd
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Filing: 1992-08-07
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Granted: —
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Expires: 2012-08-07
Abstract
Abstract An FM-CW radar device 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, the FM-CW radar device including a modulation means (3) disposed between a radar transmitting section and a transmitting antenna (4), the modulation means (3) modulating 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 velocity and beat frequency generated by the propagation delay time. The modulation means (3) modulates the transmitting signal, and the received signal reflected by the target object is frequency-modulated by a first frequency converting means (7) with the local oscillator, and further the received signal is frequency-modulated by a second frequency converting means (8) with the second frequency.
Inventors
- 👤 Tamio c/o FUJITSU LIMITED Saito
- 👤 Teruhisa c/o FUJITSU LIMITED Ninomiya
- 👤 Yoji c/o FUJITSU LIMITED Ohashi
- 👤 Yoshihiro c/o FUJITSU LIMITED Kawasaki
- 👤 Naofumi c/o FUJITSU LIMITED Okubo
- 👤 Hiroshi c/o FUJITSU LIMITED Kurihara
- 👤 Osamu Isaji
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 16:54
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/345; G01S7/00; G01S7/02; G01S7/35
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
163 words
A portable FM-CW radar device 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 provided by branching a portion of the transmitting signal, said FM-CW radar device comprising: a modulation means disposed between a radar transmitting section and a transmitting antenna, said modulation means modulating 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 velocity and a beat frequency generated by the propagation delay time, wherein said modulation means modulates the transmitting signal, and the receiving signal reflected by the object is frequency-modulated by a first frequency converting means with the local oscillator and further the receiving signal is frequency-modulated by a second frequency converting means with said second frequency.
Claim 2
Dependent Claim
165 words
A portable FM-CW radar device for frequency-modulating a high frequency signal with a modulation signal, transmitting the modulated high frequency signal, receiving a signal reflected by an object, and frequency-modulating the reflection signal with a signal generated by a local oscillation signal source provided by branching a portion of the transmitting signal, said FM-CW radar device comprising: a modulation means disposed between a radar receiving section and a receiving antenna, said modulation means modulating 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 velocity and a beat frequency generated by the propagation delay time, wherein said modulation means modulates the transmitting signal, and a modulated output signal of the modulation means is frequency-modulated by a first frequency converting means with the local oscillator and further the received signal is frequency-modulated by a second frequency converting means with said second frequency.
Claim 3
Dependent Claim
211 words
A FM-CW radar device for frequency-modulating a high frequency signal with a modulation signal, transmitting the modulated high frequency signal, receiving a signal reflected by an object, and frequency-modulating the reflection signal with a signal generated by a local oscillation signal source provided by branching a portion of the transmitting signal, said FM-CW radar device comprising: a modulation means disposed between a radar transmitting section and a transmitting antenna, said modulation means modulating 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 velocity and a beat frequency generated by the propagation delay time, wherein said modulation means modulates the transmitting signal; and a switching means disposed between a radar receiving section and a receiving antenna, said switching means conducting a switching operation with the same frequency as the second frequency on the transmission side, wherein the received signal is subjected to gating by said switching means, and the output signal of said switching means subjected to gating is frequency-modulated by a first frequency converting means with the local oscillator and further the received signal is frequency-modulated by a second frequency converting means with said second frequency.
Claim 4
Dependent Claim
28 words
The FM-CW radar device according to any one of claim 1 to 3, wherein said modulation means is a switching means that is switched by said second frequency.
Claim 5
Dependent Claim
28 words
The FM-CW radar device according to any one of claims 1 to 3, wherein said modulation means is an phase-modulated means that is phase-modulated by said second frequency.
Claim 6
Dependent Claim
34 words
The FM-CW radar device according to any one of claims 1 to 3, wherein the second frequency of a rectangular wave of a duty factor of about 50% is used for a modulating signal.
Claim 7
Dependent Claim
23 words
The FM-CW radar device according to claim 1, wherein the second frequency of a rectangular frequency-modulated wave is used for a modulating signal.
Claim 8
Dependent Claim
25 words
The FM-CW radar device according to claim 6 or 7, wherein the period of the rectangular frequency-modulated wave used for the second frequency is variable.
Claim 9
Dependent Claim
53 words
The FM-CW radar device according to claim 1, wherein a band pass filter for passing said second frequency is inserted between a first frequency converting means for frequency-converting a receiving signal of a receiver by a local oscillator and a second frequency converting means for frequency-converting a received signal by said second frequency.
Claim 10
Dependent Claim
85 words
The FM-CW radar device according to claims 1 to 3, wherein a band pass filter for passing the second frequency is inserted between a modulation signal generation means for generating said second frequency that is far lower than the radar transmitting frequency and over twice as much as the sum or the difference of a Doppler frequency generated by a relative velocity and a beat frequency generated by the propagation delay time, and said second frequency converting means that performs frequency-conversion by said second frequency.
Claim 11
Dependent Claim
21 words
The FM-CW radar device according to claim 1, wherein an isolator is inserted between said modulation means and a transmitting unit.
Claim 12
Dependent Claim
23 words
The FM-CW radar device according to claim 2, wherein an isolator is inserted between said modulation means and said first frequency converting means.
Claim 13
Dependent Claim
23 words
The FM-CW radar device according to claim 3, wherein an isolator is inserted between said switching means and said first frequency converting means.
Claim 14
Dependent Claim
25 words
The FM-CW radar device according to any one of claim 3 to 5, wherein said switching means is constituted as a balanced type switching means.
Claim 15
Dependent Claim
23 words
The FM-CW radar device according to any one of claims 1 to 5, wherein a PIN diode is used for said switching means.
Claim 16
Dependent Claim
30 words
The FM-CW radar device according to any one of claims 1 to 3, wherein a relative velocity and a distance can be measured simultaneously with respect to a target object.
References Cited (Backward Citations)
No citation records indexed.
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