US 2004/0164892 A1Published application

Monopulse radar system

AssigneeHitachi, Ltd.

InventorsHiroshi Shinoda, Hiroshi Kondoh

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Abstract

To realize a monopulse radar system wherein the velocity of a mobile body, distance between an obstacle and the mobile body and relative velocity can be detected and simultaneously, the direction of the obstacle can be detected, in a monopulse radar system wherein an azimuth is detected depending upon amplitude difference or phase difference between signals respectively received by plural receiving antennas, an array antenna composed of plural antenna elements is used for each transmitting antenna and each receiving antenna, at least one of the transmitting antenna and the receiving antenna is provided with an antenna switch for switching an antenna beam shape to a short angle/long distance or a wide angle/short distance and a switch control device that controls the switching of the antenna switch is provided.

Claims20

Dependent claims

A monopulse radar system to detect an azimuth depending upon amplitude difference or phase difference between signals respectively received by a plurality of receiving antennas, the monopulse radar system comprising:

a transmitting array antenna including a plurality of antenna elements forming an antenna train;
a receiving array antenna including a plurality of antenna elements forming an antenna train;
the receiving array antenna being used for one of the plurality of receiving antennas;
at least one antenna switch disposed among the plurality of antenna elements of at least one of the transmitting array antenna and the receiving array antenna;
and
a switch controller for turning ON/OFF said antenna switch to selectively activate said antenna elements so as to change an aperture length of at least one of the transmitting array antenna and the receiving array antenna thereby changing a beam shape of said at least one of the transmitting array antenna and the receiving array antenna,
wherein said plurality of antenna elements of the transmitting array antenna and the receiving array antenna are formed on a dielectric substrate, and
wherein a dielectric length between the antenna train formed by the plurality of antenna elements and the antenna switch included in at least one of the transmitting array antenna and the receiving array antenna is ½ dielectric wavelength.

5 more elements

A monopulse radar system for a land transportation vehicle to detect an azimuth depending upon amplitude difference or phase difference between signals respectively received by a plurality of receiving antennas, the monopulse radar system comprising:

a transmitting array antenna including a plurality of antenna elements forming an antenna train;
a receiving array antenna including a plurality of antenna elements forming an antenna train;
the receiving array antenna being used for one of the plurality of receiving antennas;
at least one antenna switch disposed among the plurality of antenna elements of at least one of the transmitting array antenna and the receiving array antenna;
and
a switch controller for turning ON/OFF said antenna switch based upon position information obtained by a position information retrieval system mounted on the vehicle,
wherein said antenna switch is turned ON/OFF to selectively activate said antenna elements so as to change an aperture length of at least one of the transmitting array antenna and the receiving array antenna thereby changing a beam shape of said at least one of the transmitting array antenna and the receiving array antenna,
wherein said a plurality of antenna elements of the transmitting array antenna and the receiving array antenna are formed on a dielectric substrate, and
wherein a dielectric length between the antenna train formed by the plurality of antenna elements and the antenna switch included in at least one of the transmitting array antenna and the receiving array antenna is ½ dielectric wavelength.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/788,354Filed 1 Mar 2004
Priority: JP 2001-38402118 Dec 2001
Published: 26 Aug 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H01Q 25/002
Antennas or antenna systems providing at least two radiating patterns: providing at least two patterns of different beamwidth; Variable beamwidth…
G01S 13/4463
Monopulse radar, i.e. simultaneous lobing: using phased arrays
H01Q 1/3233
Characterised by the application wherein the antenna is used: particular used as part of a sensor or in a security system, e.g. for automotive…
H01Q 3/2605
Varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of…

Family

Application10/083,339Continuation in part · filed 27 Feb 2002
Application10/385,617Continuation · filed 12 Mar 2003
Application10/385,617Continuation in part · filed 12 Mar 2003
Application10/788,354Continuation · filed 1 Mar 2004
US 2003/0112172 A1Published application
US 2003/0164791 A1Published application
US 6,750,810 B2Related patent
US 6,853,329 B2Related patent
US 2004/0164892 A1This patent

From the US filing history. Foreign family members aren’t listed.