Communications: directive radio wave systems and devices (e.g. – Determining velocity – Combined with determining direction
Patent
1994-04-25
1996-07-09
Pihulic, Daniel T.
Communications: directive radio wave systems and devices (e.g.,
Determining velocity
Combined with determining direction
G01S 1360
Patent
active
055348718
ABSTRACT:
A measuring apparatus is provided in one of two objects moving relatively to each other. The apparatus includes a circuit for effecting a direct spread modulation with respect to a transmission carrier signal using modulation codes; an antenna unit for transmitting the modulated carrier signal toward the other of the two objects and for receiving a reflection wave therefrom; a circuit for demodulating the received reflection wave signal using the transmission carrier signal; a circuit for making correlation between the demodulated output signal and a signal having the same code as that of the modulation code and having a phase delayed by a predetermined time; a unit for extracting a Doppler frequency component contained in a signal which has been propagated through a propagation path existing in a specified distance range; and a circuit for properly processing the extracted Doppler frequency component. By the constitution, it is possible to precisely measure a speed and/or direction angle of one object relative to the other of the two objects, without being subject to an influence by a reflection in the close neighborhood, or an influence by interference of a transmission signal or interference signal in a receiving channel of the apparatus.
REFERENCES:
patent: 4041488 (1977-08-01), Fishbein et al.
patent: 4115772 (1979-09-01), Valdes
patent: 4219812 (1980-08-01), Rittenbach
patent: 4241347 (1980-12-01), Albanese et al.
"Spread Spectrum Systems With Commercial Applications", Robert C. Dixon, Direct Sequence Systems, Third Edition, pp. 18-33, 62-85, 114-133, 158-193.
Hidaka Keiki
Suzuki Yoichiro
Mitsubishi Precision Co., Ltd.
Pihulic Daniel T.
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