Radar apparatus
DCFirst Claim
1. A radar apparatus comprising:
- a coordinate converter that converts detected data at each sample point obtained in a polar coordinate system into a rectangular coordinate system;
a detected image data generator that generates a pixel of detected image data based on each point of the converted detected data;
an image memory that stores the generated pixels of detected image data;
a data shifter that shifts detected image data input from the detected image data generator with predetermined timing and outputs the shifted detected image data; and
an azimuth direction detected image data corrector that compares generated pixels of detected image data of a current sweep with shifted detected image data of a previous sweep at the same position in a sweep distance direction, and outputs a maximum value of pieces of detected image data as detected image data of the current sweep.
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Accused Products
Abstract
A radar apparatus where the rate of writing detected image data into an image memory does not decrease, irrespective of an enlarged amount of the detected image data. When an azimuth direction enlargement section of a W data generator receives detected image data of a sweep, it outputs the data to an image memory, and delays the data, depending on a cycle of an azimuth direction shift timing signal. When detected image data of a next sweep is drawn into a pixel adjacent in a sweep moving direction to a pixel into which previous detected image data has been drawn and is located at the same distance in a sweep distance direction, the delayed data is compared with new data, and the greater data is drawn into the new pixel. When the delayed data is greater, this detected image data is enlarged in the azimuth direction.
5 Citations
10 Claims
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1. A radar apparatus comprising:
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a coordinate converter that converts detected data at each sample point obtained in a polar coordinate system into a rectangular coordinate system; a detected image data generator that generates a pixel of detected image data based on each point of the converted detected data; an image memory that stores the generated pixels of detected image data; a data shifter that shifts detected image data input from the detected image data generator with predetermined timing and outputs the shifted detected image data; and an azimuth direction detected image data corrector that compares generated pixels of detected image data of a current sweep with shifted detected image data of a previous sweep at the same position in a sweep distance direction, and outputs a maximum value of pieces of detected image data as detected image data of the current sweep. - View Dependent Claims (2, 3, 4, 5)
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6. A method of generating image data from radar detection data, the method comprising:
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converting detected data at each sample point obtained in a polar coordinate system into a rectangular coordinate system; generating a pixel of detected image data based on each point of the converted detected data; storing the generated pixels of detected image data; shifting the generated detected image data with predetermined timing; outputting the shifted detected image data; comparing generated pixels of detected image data of a current sweep with shifted detected image data of a previous sweep at the same position in a sweep distance direction; and outputting a maximum value of pieces of detected image data as detected image data of the current sweep. - View Dependent Claims (7, 8, 9, 10)
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Specification