Patent ID: 6380887
Filing Date: 2002-04-30
Classification: G01S

Abstract:
A radar system for detecting a target object, which comprises:a transmitter for generating a pulsed radar signal composed of a series of pulses spaced at a predetermined pulse repetition interval PRI; an antenna for emitting the pulsed radar signal from the transmitter into the ether, and in the event of the emitted radar signal meets the target object, picking up the echoed radar signal; a receiver for receiving the echoed radar signal picked up by the antenna and performing a preliminary signal processing procedure on the echoed radar signal; an analog processor, coupled to the receiver, for processing the output signal of the receiver and thereby generating a video frequency signal; a digital signal processor coupled to the analog processor, which is capable of digitally filtering out the clutter and mutual interference in the output video frequency signal from the analog processor to thereby generate a radar display signal comprising: a clutter canceller, receiving the output signal of the analog processor, for filtering out the clutter in the output signal of the analog processor; an integration processor, receiving the output signal of the clutter canceller, for converting the output signal of the clutter canceller into a Range-Doppler Domain representation having a number of range cells and a number of Doppler cells; a Mutual Interference Detector (MID) unit, coupled to the integration processor, for detecting whether the output signal from the integration processor contains mutual interference and thereby produce an output signal indicative of the detected result; a Constant False Alarm Ratio (CFAR) selector, coupled to the MID unit, which is capable of selecting a suited method for the computation of CFAR background value based on the output signal of the MID; a CFAR detector, coupled to the integration processor and the CFAR selector, for generating an output signal indicative of the CFAR background value through the use of the method selected by the CFAR selector; a target-detection logic circuit, coupled to the CFAR detector, for converting the output signal of the CFAR detector into an output signal indicative of the radar information about the target object and which is substantially free of clutter and mutual interference; an Range Ambiguous Resolver (RAR), coupled to the target detection circuit, for performing a range ambiguous resolving process on the output signal of the target detection circuit; a digital scanning converter coupled to the RAR, whose output signal serving as the radar display signal; and a radar display unit, which is driven by the radar display signal from the digital signal processor, for displaying the radar information about the target object.