Pulse wave radar device

• US 7,012,562 B2
• Filed: 11/22/2004
• Issued: 03/14/2006
• Est. Priority Date: 12/22/2003
• Status: Expired due to Fees

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Ikeda, Hiroshi
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US10/992,724
• Publication Number:
  US 20050134502A1
• Time in Patent Office: 477 Days
• Field of Search: 342 13- 20, 342/27, 342/28, 342 42- 45, 342/60, 342/61, 342 70- 72, 342 89-103, 342/118, 342/127, 342128-146, 342/159, 342165-175, 342/195
• US Class Current: 342/159
• CPC Class Codes: G01S 13/284 using coded pulses
• CPC Class Codes: G01S 13/931 of land vehicles
• CPC Class Codes: G01S 2013/93185 Controlling the brakes
• CPC Class Codes: G01S 2013/9325 for inter-vehicle distance regulation, e.g. navigating in platoons
• CPC Class Codes: G01S 2013/93271 in the front of the vehicles
• CPC Class Codes: G01S 2013/93275 in the bumper area
• CPC Class Codes: G01S 7/003 Transmission of data between radar, sonar or lidar systems and remote stations
• CPC Class Codes: G01S 7/023 Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36
• CPC Class Codes: G01S 7/0234 Avoidance by code multiplex

Abstract

A pulse wave radar device transmits at a constant period a transmitting signal in which identification data for identifying of pulse wave radar devices is added to a distance-measuring signal so that any other pulse wave radar device can identify a receiving wave reflected by a target owing to a transmitting wave that itself has transmitted.

Claims

1. A pulse wave radar device comprising:

a transmitting signal generation circuit for generating a transmitting signal in which a distance-measuring signal and a user data signal are multiplexed one on the other;

an RZ code conversion circuit for generating an RZ propagation signal obtained by RZ-converting the transmitting signal from the transmitting signal generation circuit into a RZ code having a predetermined pulse width;

a transmitting circuit for transmitting a transmitting wave obtained by intensity-modulating the RZ propagation signal from the RZ code conversion circuit at a local oscillation frequency;

a transmitting antenna for emitting the transmitting wave sent from the transmitting circuit;

a receiving antenna for receiving a receiving wave reflected by a target; and

a receiving circuit for intensity-demodulating the receiving wave into RZ propagation signal by detecting the receiving wave from the receiving antenna.

2. The pulse wave radar device according to claim 1, further comprising a signal separation circuit for separating the RZ propagation signal from the receiving circuit into the distance-measuring signal and the user data signal.

3. The pulse wave radar device according to claim 1 or 2, further comprising a time calculation circuit for detecting a lapse of time that has elapsed from a moment of emission of the transmitting wave to a moment of reception of the receiving signal to thereby calculate a reciprocating propagation time to the target.

4. The pulse wave radar device according to claim 1 or 2, wherein the user data signal includes identification data for identifying the pulse wave radar device.

5. The pulse wave radar device according to claim 4, further comprising a determination circuit for deciding a reciprocating propagation time calculated by the time calculation circuit to be valid if identification data separated by the signal separation circuit coincides with identification data multiplexed by the transmitting signal generation circuit.

6. The pulse wave radar device according to claim 5, wherein if the determination circuit determines that identification data separated by the signal separation circuit does not coincide with identification data multiplexed by the transmitting signal generation circuit, the time calculation circuit sustains a reciprocating propagation time determined by the determination circuit to be valid because of coincidence before.

7. The pulse wave radar device according to claim 1 or 2, wherein the user data signal includes communication information to be transferred to an outside of the pulse wave radar device.

8. The pulse wave radar device according to claim 1 or 2, wherein a clock cycle of a transmitting signal transmitted by the transmitting signal generation circuit is 10 MHz or less.

9. The pulse wave radar device according to claim 1 or 2, wherein a pulse width of a code of an RZ propagation signal generated by the RZ code conversion circuit is 2 nsec or less.