RADAR DEVICE

PROBLEM TO BE SOLVED: To solve problems in a method for disposing antenna elements close to each other so as not to develop a grating lobe causing uncertainty of angle information that disposition developing no grating lobe is not actualized since antenna element sizes have limits and the total numb...

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Bibliographische Detailangaben
1. Verfasser:	FUKAI KAZUO
Format:	Patent
Sprache:	eng
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To solve problems in a method for disposing antenna elements close to each other so as not to develop a grating lobe causing uncertainty of angle information that disposition developing no grating lobe is not actualized since antenna element sizes have limits and the total number of antenna elements gets vast even if the antenna elements can be disposed close to each other. SOLUTION: This radar device emits transmission signals of frequency f1 and subsequently of frequency f2 at the same angle of direction. When detecting a reflected wave of the frequency f2 after detecting a reflected wave of the frequency f1, the reflected wave of the frequency f1 is determined to be a reflected wave caused by the radiation pattern of a main beam. When the reflected wave of the frequency f2 is not detected, the reflected wave of the frequency f1 is determined to be a reflected wave caused by a grating lobe, thus removing uncertainty of angle information. COPYRIGHT: (C)2005,JPO&NCIPI