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Phase monopulse radar system and target detecting method

A monopulse radar, phase technology, applied in the field of target detection, can solve the problems of mutual interference, inability to operate correctly, and wrong detection of the target position, and achieve the effect of improving accuracy

Inactive Publication Date: 2015-02-25
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, as the distance between the reflection point and the radar system (i.e., the receiving antenna) changes, the reflected waves from two or more reflection points may interfere with each other; in this case, due to the interference of the reflected waves, see A reflected wave that appears to originate from the receiving antenna side appears to be reflected or transmitted from a point whose azimuth is substantially different from that of the midpoint between two or more reflection points
In this case, the position of the target may be misdetected, and the follow-up operation cannot be performed correctly

Method used

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  • Phase monopulse radar system and target detecting method

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no. 1 example

[0027] figure 1 It is a block diagram of the phase monopulse radar system 10 as the first embodiment of the present invention. The phase monopulse radar system 10 of the present invention is mounted on, for example, a vehicle, and is operable to detect the distance between the vehicle and an object (target) existing around the vehicle (for example, located in front of, behind, or to the side of the vehicle), and the distance of the object Azimuth (angle) θ. The phase monopulse radar system 10 is applied to, for example, an FM-CW type millimeter-wave radar system, which detects the position (distance and orientation) of a target relative to a vehicle.

[0028] Such as figure 1 As shown, the phase monopulse radar system 10 includes a transmitting antenna 12 that transmits a transmission signal, and two receiving antennas 14-1, 14-2 that receive reflected waves of the transmission signal as received signals. The signal generating circuit 18 is connected to the transmission antenna ...

no. 2 example

[0063] In the first embodiment described above, it depends on whether the amount of change in the phase difference Δφ of the received signal near the peak frequency fr is equal to or greater than a given value (more specifically, the maximum value Δφmax and the minimum value of the phase difference Δφ of the received signal Whether the difference between Δφmin is equal to or greater than a given threshold), determine whether phase inversion occurs in any of the received signals received by the two receiving antennas 14-1 and 14-2. In the second embodiment of the present invention, on the other hand, the occurrence of the above phase inversion is judged by another method.

[0064] Figure 8 It is a block diagram of the phase monopulse radar system 100 according to the second embodiment of the present invention. in Figure 8 In, and figure 1 The same reference numerals in the reference numerals refer to those with figure 1 The same or corresponding parts or units will not be explai...

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Abstract

A phase monopulse radar system includes a transmitting antenna that transmits a transmission signal, a plurality of receiving antennas that receive reflected waves of the transmission signal as received signals, a target azimuth detecting unit that detects an azimuth of a target based on a phase difference of the received signals received by the receiving antennas, a phase inversion determining unit that determines whether a phase inversion occurs to any one of the received signals, at around a peak frequency of a frequency spectrum of the received signal, and a detection object excluding unit that does not use an azimuth based on the phase difference as a target azimuth, when the phase inversion determining unit determines that the phase inversion occurs.

Description

Technical field [0001] The present invention generally relates to a phase monopulse radar system and a target detection method. In particular, the present invention relates to a phase monopulse radar system adapted to detect the azimuth of a target based on the phase difference of received signals respectively received by two or more receiving antennas, and a target detection method. Background technique [0002] Such a phase monopulse radar system is known: it includes a transmission antenna that transmits a transmission signal, and two or more receiving antennas that receive the reflected wave of the transmission signal reflected by the target (see, for example, Japanese Patent Application Publication No. 2003-248054 (JP 2003-248054)). The phase monopulse radar system uses the two or more receiving antennas to receive the reflected wave of the transmission signal, and calculates the phase difference between the received signals received by the two or more receiving antennas, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/44
CPCG01S13/4454G01S2007/356G01S2007/358G01S13/931G01S7/358G01S7/356G01S7/28G01S13/02
Inventor 佐藤洋柳内昭宏永宫清美西田一道山田隆志小川胜
Owner TOYOTA JIDOSHA KK