RADAR INTERFERENCE WAVE ELIMINATION DEVICE

Japanese Patent JP2773550

B2

PURPOSE: To eliminate radar interference wave properly without being affected by deterioration in adaptive following characteristics of a digital transmission signal for eliminating interference wave when a radar wave where a CW wave signal is pulse-modulated interferes with digital transmission.
CONSTITUTION: In the title device with front and rear filters which are criterion feedback type equalizers, arbitrary taps of the front filter are correlated by a correlator 110, a tap correction circuit 111 corrects the tap coefficient of the front and rear filters by an adaptive algorithm when an amplitude η of the correlation value is equal to or more than a threshold γ and interrupts correction by the adaptive algorithm and then retains the tap coefficient before interruption when the amplitude η of the correlation value is smaller than γ. Adaptive following characteristics due to interruption of radar pulse do not deteriorate owing to a system without any interruption of tap correction even if the radar pulse period is higher than the adaptive speed of the criterion feedback type equalizers, thus eliminating the pulse-modulated radar interference wave whose D/U ratio is inverted.

JP4564418	Radar device
WO/2001/094975	SYSTEM AND METHOD FOR DETECTION AND TRACKING OF TARGETS

Ichiro Tsujimoto

JP17393192A

July 09, 1998

July 01, 1992

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NEC

G01S7/295; G01S7/285; G01S7/36; H03H17/00; H03H17/02; H03H21/00; H04B7/005; (IPC1-7): G01S7/36; G01S7/285; H03H17/02; H04B7/005

JP595298A
JP6367811A
JP3284014A
JP3284012A
JP831820B2

Ｌ．ＬＩ ＡＮＤ Ｌ．Ｂ．ＭＩＬＳＴＥＩＮ，”ＲＥＪＥＣＴＩＯＮ ＯＦ ＣＷ ＩＮＴＥＲＦＥＲＥＮＣＥ ＩＮ ＱＰＳＫ ＳＹＳＴＥＭＳ ＵＳＩＮＧ ＤＥＣＩＳＩＯＮ−ＦＥＥＤＢＡＣＫ ＦＩＬＴＥＲＳ”，ＩＥＥＥ ＴＲＡＮＳ． ＣＯＭＭＵＮ． ＶＯＬ．ＣＯＭ−３１，ＮＯ．４，ＰＰ．４７３−４８３，ＡＰＲ．１９８３

Naoki Kyomoto (2 outside)

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