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US 2003/0142007 A1Published application
Signal processing method for scanning radar
AssigneeFujitsu Tem Limited
InventorsDaisaku Ono, Masayuki Kishida
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AssigneeFujitsu Tem Limited
InventorsDaisaku Ono, Masayuki Kishida
Estimating the term…
A method that can locate the center of a target even when the target is a large vehicle, and that, when a plurality of beams are reflected, determines whether the reflected beams are from the same target or not, wherein, of peaks generated based on a radar signal reflected from the target, peaks whose frequencies are substantially the same and whose reception levels are not smaller than a predetermined value are selected and, when a plurality of such peaks are selected, a center angle between the angles of the leftmost and rightmost peaks is obtained, and the thus obtained center angle is taken as an angle representing the target. Further, the plurality of peaks are paired up to detect a distance, relative velocity, and displacement length for each of reflecting points on the target, and when the differences in these values are all within respectively predetermined values, the plurality of peaks are determined as being peaks representing the same target.
A signal processing method for a scanning radar wherein, of peaks generated based on a radar signal reflected from a target, peaks whose frequencies are substantially the same and whose reception levels are not smaller than a predetermined value are selected and, when a plurality of such peaks are selected, a center angle between the angles of the leftmost and rightmost peaks is obtained, and said obtained center angle is taken as an angle representing said target.
A signal processing method for a scanning radar wherein, of peaks generated based on a radar signal reflected from a target, a plurality of peaks whose frequencies are substantially the same are selected, and pairing is performed on said plurality of peaks to detect a distance, relative velocity, and displacement length for each of reflecting points on said target, and wherein when the differences in said detected distance, relative velocity, and displacement length, existing between said reflecting points, are all within respectively predetermined values, said plurality of peaks are determined as being peaks representing the same target.
A signal processing method for a scanning radar wherein, of peaks generated based on a radar signal reflected from a target, peak signals whose reception levels are the largest in rising and falling portions, respectively, of said radar signal are extracted for pairing therebetween, after which peak signals located at equivalent positions in terms of angle and frequency differences relative to the respective peak signals whose reception levels are the largest are extracted from said rising and falling portions, respectively, for pairing therebetween.
A signal processing method for a scanning radar wherein, of peaks generated based on a radar signal reflected from a target, peak signals whose reception levels are the largest in rising and falling portions, respectively, of said radar signal are extracted for pairing therebetween, a range R1 defined by predetermined frequency and angle ranges containing the frequency and angle of each of said largest peak signals and a range R2 wider than said range 1 are determined, and said ranges R1 and R2 are searched for peaks having substantially the same angle in said rising and falling portions, respectively and wherein, when said peaks are located in said range R1, said peaks are paired up if the difference in frequency between said peaks is within a first predetermined range, but when said peaks are located in said range R2, said peaks are paired up if the difference in frequency between said peaks is within a second predetermined range which is smaller than said first predetermined range.
Dependencies are inferred from the claim text.