[특허]Distance measuring method and apparatus therefor

Distance measuring method and apparatus therefor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-009/00
출원번호	US-0307891 (1989-02-07)
우선권정보	JP-0026582 (1988-02-09); JP-0250784 (1988-10-06)
발명자 / 주소	Nagamune Akio (Tokyo JPX) Tezuka Koichi (Tokyo JPX) Kanao Yoshiyuki (Yokohama JPX)
출원인 / 주소	NKK Corporation (Tokyo JPX 03)
인용정보	피인용 횟수 : 39 인용 특허 : 0

초록 ▼

A distance measuring method and apparatus in which first and second pseudo random signals which are the same in pattern but slightly different in period are generated to obtain a correlation output of the first and second pseudo random signals before transmission thereof as a reference correlation output, and the first pseudo random signal is directly transmitted toward a target or alternatively a carrier wave is modulated by the first pseudo random signal and transmitted toward the target. A correlation output of the signal reflected and received from the target and the second pseudo random signal is detected and the distance to the target is measured from the time interval between the reference correlation output and the received correlation output. Alternatively, the modulated carrier wave reflected and received from the target and the second pseudo random signal are subjected to correlation processing to detect a correlative modulated carrier wave and the correlative modulated carrier wave is subjected to orthogonal detection by a reference carrier wave thereby obtaining a target detection output. Then, the distance to the target is measured from the time interval between the reference correlation output and the target detection output.

대표청구항 ▼

A distance measuring apparatus comprising: means for generating a first pseudo random signal having a clock frequency f1; means for transmitting an output of said first pseudo random signal generating means as an electromagnetic wave signal toward a target; receiving means for receiving a reflected signal from said target to obtain a received signal; means for generating a second pseudo random signal which is the same in pattern as said first pseudo random signal but having a clock frequency f2 which is slightly different from said clock frequency f1; a first multiplier for multiplying the output of said first pseudo random signal generating means by an output of said second pseudo random signal generating means; a second multiplier for multiplying an output of said receiving means by the output of said second pseudo random signal generating means; a first low pass filter for smoothing the output of said first multiplier and outputting a first smoothed signal; a second low pass filter for smoothing the output of said second multiplier and outputting a second smoothed signal; first pulse generating means for generating a pulse when the first smoothed signal from said first low pass filter reaches a maximum; second pulse generating means for generating a pulse when the second smoothed signal obtained from said second low pass filter reaches a maximum; measuring and calculating means for measuring the time interval between the point when said first pulse is generated and the point when said second pulse is generated, multiplying one half of said time interval by the propagation velocity of said electromagnetic wave to form a first operation value as the product of said multiplication, dividing the frequency difference between said clock frequencies f1 and f2 by said clock frequency f1 to form a second operation value as the quotient of said division and multiplying said first operation value by said second operation value to calculate the distance to said target as the product of said multiplication.

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