Method and apparatus for radar measurement of ball in play
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01S-013/38
G01S-005/06
출원번호
US-0747380
(1991-08-20)
발명자
/ 주소
Nuttall Jerry A. (Midvale UT)
출원인 / 주소
Matrix Engineering, Inc. (Midvale UT 02)
인용정보
피인용 횟수 :
64인용 특허 :
0
초록▼
A system for continuously and precisely measuring the positions of a generally symmetrical object, e.g., a tennis ball, in motion in a predefined three-dimensional region, e.g., a tennis court, which transmits multiple radar signals from first, second, and third, spaced antenna devices, respectively
A system for continuously and precisely measuring the positions of a generally symmetrical object, e.g., a tennis ball, in motion in a predefined three-dimensional region, e.g., a tennis court, which transmits multiple radar signals from first, second, and third, spaced antenna devices, respectively, into the three-dimensional region. Multiple return signals are sensed and are compared with the transmitted signals to determine the phases of the return signals, to thereby obtain ambiguous ranges of the object. Ambiguities are removed by using the Chinese Remainder Theorem to obtain less-ambiguous ranges. Time-of-arrival range information is used in conjuction with the less-ambiguous ranges to provide unambiguous ranges over the range of interest. The unambiguous ranges are used to compute three-dimensional coordinates of the object that are accurate to within approximately 0.1 inches. A mathematical model defining boundaries of the three-dimensional region is completed by placing signal reflector devices on various boundary points of the three-dimensional region, and transmitting the radar signals when the object is not in the three-dimensional region. Coordinates of a projected trajectory are computed and compared with the actual coordinatres of the object, and certain characteristics are computed therefrom. Calibration of the system is maintained by placing signal reflector devices at various fixed locations within the region of interest and the return signals are processed to obtain an initial survey of the region and then to periodically resurvey the region.
대표청구항▼
A method of precisely measuring the positions of a generally symmetrical object in motion, in a predefined three-dimensional region, comprising the steps of: (a) transmitting multiple radar signals from each of first, second, and third spaced antenna devices, respectively, into the three-dimensional
A method of precisely measuring the positions of a generally symmetrical object in motion, in a predefined three-dimensional region, comprising the steps of: (a) transmitting multiple radar signals from each of first, second, and third spaced antenna devices, respectively, into the three-dimensional region, the object reflecting multiple return signals corresponding to the multiple radar signals, respectively; (b) sensing the return signals by means of receivers connected to the first, second, and third antenna devices, respectively; (c) comparing the return signals with the corresponding transmitted multiple radar signals, respectively, to determine phases of the return signals relative to phases of the corresponding transmitted multiple radar signals, respectively, to obtain ambiguous representations of first, second, and third ranges of the object relative to the first, second, and third antenna devices, respectively; (d) removing ambiguities of the first, second, and third ranges using modular arithmetic to obtain first, second, and third less-ambiguous ranges or unambiguous ranges of the object relative to the first, second, and third antenna devices, respectively; (e) if the ambiguities removed in step (d) do not result in an unambiguous region sufficiently large to define first, second, and third unambiguous ranges of the object, using first, second, and third time of arrival range information and/or a priori information in conjunction with the first, second, and third less ambiguous ranges to obtain the first, second, and third unambiguous ranges of the object; and (f) computing three-dimensional coordinates of the object using the first, second, and third unambiguous ranges and the coordinates of the first, second, and third antenna devices.
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