Radar device and processing method of the same

• US 7,612,709 B2
• Filed: 07/17/2008
• Issued: 11/03/2009
• Est. Priority Date: 01/17/2006
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kawano, Yoichi, Nakasha, Yasuhiro
• Primary Examiner(s): Sotomayor; John B
• Application Number:
  US12/175,081
• Publication Number:
  US 20090009384A1
• Time in Patent Office: 474 Days
• Field of Search: 342/195, 342/135
• US Class Current: 342/135
• CPC Class Codes: G01S 13/10 using transmission of interrupted, pulse modulated waves determination of distance by phase measurement G01S13/32
• CPC Class Codes: G01S 7/282 Transmitters

Abstract

A radar device has a clock generator (131) generating a base clock; a transmitter (121 to 125) transmitting transmission pulses as gradually increasing a displacement amount with respect to each edge of the base clock; and a receiver (101 to 106) receiving reflected waves of the transmitted transmission pulses in synchronization with the edges of the base clock.

Claims

1. A radar device comprising:

a clock generator generating a base clock;

a transmitter transmitting transmission pulses as gradually increasing a displacement amount with respect to each edge of the base clock; and

a receiver receiving reflected waves of the transmitted transmission pulses in synchronization with the edges of the base clock.

2. The radar device according to claim 1, wherein

said receiver comprises an extractor extracting a level of received signals in synchronization with a continuous clock.

3. The radar device according to claim 2, wherein

the extractor comprises a compound semiconductor element.

4. The radar device according to claim 3, wherein

the compound semiconductor element is a high electron mobility transistor or a hetero bipolar transistor.

5. The radar device according to claim 1, wherein

said receiver comprises an analog-digital converter converting a reception signal from analog to digital in synchronization with an intermittent clock.

6. The radar device according to claim 1, wherein

said receiver comprises an extractor extracting a level of received signals in synchronization with a continuous clock and an analog-digital converter converting the extracted level from analog to digital in synchronization with an intermittent clock.

7. The radar device according to claim 6, wherein

the extractor comprises a compound semiconductor element.

8. The radar device according to claim 7, wherein

the compound semiconductor element is a high electron mobility transistor or a hetero bipolar transistor.

9. A processing method of a radar device, comprising:

generating a base clock;

transmitting transmission pulses as gradually increasing a displacement amount with respect to each edge of the base clock; and

receiving reflected waves of the transmitted transmission pulses in synchronization with the base clock.

10. The processing method according to claim 9, wherein the displacement amount increases by a certain amount.

11. The processing method according to claim 9, wherein the transmission pulses are shifted earlier with respect to each edge of the base clock.