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An inexpensive surveillance radar apparatus capable of identifying the kind of an object by using a monopulse radar that performs wide-angle two-dimensional surveillance. The radar apparatus receives reflected waves from a plurality of points on a moving object within a monitoring area, using a mono

An inexpensive surveillance radar apparatus capable of identifying the kind of an object by using a monopulse radar that performs wide-angle two-dimensional surveillance. The radar apparatus receives reflected waves from a plurality of points on a moving object within a monitoring area, using a monopulse radar apparatus for measuring of angles, and determines the reflection point for each reflected wave, and then calculates the position and the width in the measuring angle of the surveillance radar of a moving object.

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What is claimed is: 1. A radar apparatus that transmits a radiowave toward a monitoring area and receives a reflected wave from a moving object, detects said moving object based on said reflected wave, and determines a position of a reflection point on said detected moving object, said radar appara

What is claimed is: 1. A radar apparatus that transmits a radiowave toward a monitoring area and receives a reflected wave from a moving object, detects said moving object based on said reflected wave, and determines a position of a reflection point on said detected moving object, said radar apparatus comprising: a detected object measuring unit configured to determine positions of a plurality of reflection points on said moving object; and a width calculating unit configures to calculate a spatial width of said moving object based on distribution of measured positions, wherein said plurality of reflection points for determining the position are selected based on values of a plurality of Doppler frequencies developed due to a difference in relative velocity to said radar apparatus for each reflection point on a detected moving object. 2. The radar apparatus according to claim 1, further comprising a width calculating unit that calculates a scattering measure in an azimuthal direction of said determined plurality of reflection points, and calculates a spatial width in an azimuthal direction of the detected moving object. 3. The radar apparatus according to claim 2, wherein said width calculating unit further calculates a value obtained by multiplying a tangent of said scattering measure with a distance to the detected moving object, and further multiplying with a predetermined proportional coefficient, as the spatial with in the azimuthal direction of the detected moving object. 4. The radar apparatus according to claim 2, wherein said scattering measure is a standard deviation of the azimuthal positions of determined plurality of reflection points. 5. The radar apparatus according to claim 1, wherein said radar apparatus determines the azimuthal position of a reflection point on the detected moving object by means of monopulse angle measuring techniques. 6. The radar apparatus according to claim 1, further comprising a detected object identify unit that identifies a kind of said moving object based on the value calculated as the spatial width in the azimuthal direction of the detected moving object. 7. The radar apparatus according to claim 6, wherein said detected object identify unit judges that, when a value calculated as the spatial width in the azimuthal direction of the detected moving object is within a predetermined range, said moving object is a human. 8. The radar apparatus according to claim 6, wherein said detected object identify unit judges that, when a value calculated as a spatial width in the azimuthal direction of the detected moving object is within a predetermined range, said moving object is a vehicle. 9. The radar apparatus according to claim 1, wherein said radar apparatus is installed at a predetermined place inside or outside of a room, wherein said radar apparatus further comprises a memory unit in which a monitoring area is pre-stored, and wherein said radar apparatus detects a moving object within said monitoring area. 10. The radar apparatus according to claim 1, wherein said radar apparatus is installed on a vehicle, and wherein said radar apparatus further comprises a width calculating unit configured to calculate the width of a detected object. 11. The radar apparatus according to claim 1, wherein said radar apparatus is installed on a vehicle, and wherein said radar apparatus further comprises a detected object identify unit that judges whether or not said object blocks traveling of said vehicle, based on positional and spatial width information on a detected object. 12. The radar apparatus according to claim 1, wherein said detected object measuring unit measures a distance to and an azimuth of a plurality of reflection points on the detected moving object. 13. The radar apparatus according to claim 1, further comprising: a memory unit configured to store a value calculated as the spatial width in the azimuthal direction of the detected moving object; and a width correction unit that corrects the value of said spatial width of said moving object based on information stored in a memory unit, wherein said width correction unit, when the value of a spatial width in the azimuthal direction of said moving object stored in said memory unit is different from a current value of the spatial width in the azimuthal direction calculated by said radar apparatus, corrects the value of the spatial width in the azimuthal direction based on the information stored in said memory unit. 14. The radar apparatus according to claim 1, further comprising a width correction unit that outputs information indicating that, when the detected moving object is located in a vicinity of a border between a detectable azimuthal area and an undetectable azimuthal area of said radar apparatus, a value output as the spatial width in the azimuthal direction is a lower limit value of a spatial width in the azimuthal direction of said moving object. 15. A radar apparatus that transmits a radiowave toward a monitoring area and receives a reflected wave from a moving object, detects said moving object based on said reflected wave, and determines a position of a reflection point on said detected moving object, said radar apparatus comprising: a detected object measuring unit configured to determine positions of a plurality of reflection points on said moving object; a width calculating unit configured to calculate a spatial width of said moving object based on distribution of measured positions; and a width calculating unit that calculates a scattering measure in an azimuthal direction of said determined plurality of reflection points, and calculates a spatial width in an azimuthal direction of a detected moving object, wherein said detected object measuring unit measures a distance to and an azimuth of a plurality of reflection points on the detected moving object, and wherein said width calculating unit further calculates a value obtained by multiplying a tangent of said scattering measure with a distance to the detected moving object, and further multiplying with a predetermined proportional coefficient, as the spatial with in the azimuthal direction of the detected moving object. 16. A radar apparatus that transmits a radiowave toward a monitoring area and receives a reflected wave from a moving object, detects said moving object based on said reflected wave, and determines a position of a reflection point on said detected moving object, said radar apparatus comprising: a detected object measuring unit configured to determine positions of a plurality of reflection points on said moving object; a width calculating unit configured to calculate a spatial width of said moving object based on distribution of measured positions; and a width calculating unit that calculates a scattering measure in an azimuthal direction of said determined plurality of reflection points, and calculates a spatial width in an azimuthal direction of a detected moving object, wherein said detected object measuring unit measures a distance to and an azimuth of a plurality of reflection points on the detected moving object, and wherein said scattering measure is a standard deviation of the azimuthal positions of determined plurality of reflection points. 17. A radar apparatus that transmits a radiowave toward a monitoring area and receives a reflected wave from a moving object, detects said moving object based on said reflected wave, and determines a position of a reflection point on said detected moving object, said radar apparatus comprising: a detected object measuring unit configured to determine positions of a plurality of reflection points on said moving object; a width calculating unit configured to calculate a spatial width of said moving object based on distribution of measured positions; a memory unit configured to store a value calculated as a spatial width in an azimuthal direction of a detected moving object; a width correction unit that corrects the value of said spatial width of said moving object based on the information stored in a memory unit, wherein said detected object measuring unit measures a distance to and an azimuth of the plurality of reflection points on the detected moving object, and wherein said width correction unit, when the value of a spatial width in the azimuthal direction of said moving object stored in said memory unit is different from a current value of a spatial width in the azimuthal direction calculated by said radar apparatus, corrects the value of a spatial width in the azimuthal direction, based on the information stored in said memory unit. 18. A radar apparatus that transmits a radiowave toward a monitoring area and receives a reflected wave from a moving object, detects said moving object based on said reflected wave, and determines a position of a reflection point on said detected moving object, said radar apparatus comprising: a detected object measuring unit configured to determine positions of a plurality of reflection points on said moving object; a width calculating unit to calculate a spatial width of said moving object based on distribution of measured positions; and a width correction unit that outputs information indicating that, when a detected moving object is located in a vicinity of a border between a detectable azimuthal area and an undetectable azimuthal area of said radar apparatus, a value output as a spatial width in an azimuthal direction is a lower limit value of a spatial width in an azimuthal direction of said moving object, wherein said detected object measuring unit measures a distance to and an azimuth of a plurality of reflection points on the detected moving object. 19. A radar apparatus that radiates a wave toward a monitoring area and receives the reflected wave from a moving object, detects said moving object based on the reflected wave, and determines a position of a reflection point on said detected moving object, said radar apparatus comprising: an analogue circuit having a transmitting antenna and a receiving antenna and outputting a signal that has been converted to a digital signal by an A/D converter; and a signal processing unit that process the signal from said analogue circuit, wherein said signal processing unit includes: an FFT processing unit that performs an FFT processing on an input signal; a peak extraction unit that extracts signal power peaks from a frequency spectrum based on a signal-to-noise ratio; a detected object measuring unit that calculates a distant from the radar apparatus and an azimuth of the position of the reflection point on said moving object; and a width calculating unit that calculates a spatial width of said moving object from the distance from the radar apparatus and the azimuth of the position of a reflection point on a moving object to be input from said detected object measuring unit. 20. The radar apparatus according to claim 19, wherein said signal processing unit further includes: a memory unit that stores a signal-to-noise ratio which is a threshold level for extracting a signal power peak on a frequency spectrum; a positional correction unit that corrects a position calculated by said detected object measuring unit based on past measurement information stored in said memory unit; and a width correction unit that corrects a width calculated by said width calculating unit based on the past measurement information stored in said memory unit. 21. The radar apparatus according to claim 19, wherein said signal processing unit further includes a detected object identify unit that identifies a kind of said moving object based on the moving velocity, distance, azimuthal position, and width in the azimuthal direction of said moving object. 22. The radar apparatus according to claim 19, wherein measuring of the distance to the reflection point on said moving object is performed by a two-frequency CW modulation technique.