Title:
PHASED ARRAY RADAR DEVICE
Document Type and Number:
Japanese Patent JPH01153989
Kind Code:
A
Abstract:
PURPOSE:To improve detecting and tracking performance for a short-distance target by detecting and tracking targets at data rates matching with long- distance and short-distance targets. CONSTITUTION:A control signal from a control data memory 21 is sent to a transmission trigger generator 16 and a pulse width generator 14 through a PRF memory 17 and a pulse width memory 15. Further, the signal from the memory 21 is sent to an antenna 5 through a beam controller 8. A pulse signal outputted from the generator 14 is applied to a pulse modulator 13 and a high-frequency continuous wave from a coho is pulse-modulated into a high-frequency signal, which is mixed with a signal applied from a frequency converter 11 from a local oscillator 12 and radiated in the air through a transmitter 7, a transmission/reception separating circuit 6, and an antenna 5. The composite signal when received is sent to a receiver by the antenna through the circuit 6. Further, the output signal of the coho 10 is applied to a modulator 13 and a system clock generator 19 and counted down to become the system clock of the whole device.
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Inventors:
YOKOYAMA HIROSHI
Application Number:
JP31328987A
Publication Date:
June 16, 1989
Filing Date:
December 11, 1987
Export Citation:
Assignee:
NEC CORP
International Classes:
G01S7/02; G01S13/22; G01S13/42; H01Q3/30; G01S13/66; (IPC1-7): G01S7/02; G01S13/66; H01Q3/30
Attorney, Agent or Firm:
Yoshihiro Yawata