Monopulse radar apparatus and antenna switch
AssigneeFujitsu Ten Limited
InventorsKanako Honda, Kenji Oka, Kimihisa Yoneda
Life of this patent
Estimating the term…
Abstract
An antenna system is effectively formed in a limited space, to make a configuration of the antenna system a simple mechanism. In a monopulse radar apparatus, an antenna unit includes an array antenna (a wide-beam array antenna) formed by a part of antenna elements that are constituent elements of the antenna unit (an area K1), and a plurality of narrow-beam array antennas formed as array antennas having a narrower beam width than the array antenna. A monopulse process is performed based on an output of a predetermined pair of array antennas (areas K2 and K3) from among the array antennas formed as the narrow-beam array antennas.
Claims39
-25. (canceled)
A monopulse radar apparatus comprising:
- a transmitter that generates a transmission signal to detect a target, and outputs generated transmission signal;
- an antenna unit including
- at least one transmission antenna;
- and
- a plurality of reception antennas;
- a receiver that detects information including azimuth information for the target, based on an output from the antenna unit;
- and
- an antenna switching unit that switches a connection between the transmitter and the transmission antenna and a connection between the reception antenna and the receiver,
- said antenna unit includes
- a wide-beam array antenna and plural of narrow-beam array antennas having a narrower beam width than said wide-beam array antenna, and
- a monopulse process is performed based on an output of a pair of said narrow-beam array antennas.
A monopulse radar apparatus comprising:
- a transmitter that generates a transmission signal to detect a target, and outputs generated transmission signal;
- an antenna unit including
- at least one transmission antenna;
- and
- a plurality of reception antennas;
- a receiver that detects information including azimuth information for the target, based on an output from the antenna unit;
- and
- an antenna switching unit that switches a connection between the transmitter and the transmission antenna and a connection between the reception antenna and the receiver,
- said antenna unit includes
- at least three array antennas composed of the antenna elements, and
- a monopulse process is performed based on outputs of at least thee sets of a pair of array antennas with different distances between elements.
A monopulse radar apparatus comprising:
- a transmitter that generates a transmission signal to detect a target, and outputs generated transmission signal;
- an antenna unit including
- at least one transmission antenna;
- and
- a plurality of reception antennas;
- a receiver that detects information including azimuth information for the target, based on an output from the antenna unit;
- and
- an antenna switching unit that switches a connection between the transmitter and the transmission antenna and a connection between the reception antenna and the receiver, wherein
- said antenna unit including
- at least three array antennas composed of the antenna elements,
- the azimuth angle of the target is calculated for each phase difference detected based on outputs of at least two sets of a pair of array antennas having different distances between elements, and
- targets of a same speed and a same distance are selected from calculated azimuth angles.
An antenna switch that selectively connects a plurality of antennas to either a transmitter or a receiver, the antenna switch comprising:
- a first amplifier that amplifies a transmission signal from the transmitter, and supplies amplified transmission signal to one antenna;
- a second amplifier that amplifies a reception signal of the one antenna;
- a plurality of third amplifiers that amplify reception signals of other antennas, respectively;
- and
- a first switch that selects one of an output of said second amplifier and outputs of said third amplifiers, and supplies selected output to the receiver.
Dependencies are inferred from the claim text.