Title:
DISTANCE MEASUREMENT SIGNAL PROCESSING CIRCUIT AND DISTANCE MEASURING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2012/121337
Kind Code:
A1
Abstract:
A signal processing circuit (20) comprises a multistage amplifying circuit (30), N comparing circuits (40), N time measuring circuits (50) and a TOF estimating circuit (70). The second to N-th stage amplifying circuits (A(2) to A(N)) in the multistage amplifying circuit (30) are non-inverting amplifying circuits. The TOF estimating circuit (70) calculates delay time differences {Tm(n) - Tm(n + 1)} from measured times Tm(n) and Tm(n + 1) measured by the time measuring circuits (50), then estimates the magnitudes of measured signal current (Ip) on the basis of the delay time differences, thereafter estimates, on the basis of the magnitudes of the measured signal currents (Ip), delay times Td(n) included in the measured times Tm(n), and subtracts the delay times Td(n) from the measured times Tm(n), thereby calculating a flight time TTOF. In this way, a wide distance range can be measured and the TOF can be measured with high precision.
Inventors:
KAWAHITO SHOJI (JP)
OGAWA HIROKI (JP)
SUZUKI TAKASHI (JP)
OGAWA HIROKI (JP)
SUZUKI TAKASHI (JP)
Application Number:
PCT/JP2012/055986
Publication Date:
September 13, 2012
Filing Date:
March 08, 2012
Export Citation:
Assignee:
UNIV SHIZUOKA NAT UNIV CORP (JP)
HAMAMATSU PHOTONICS KK (JP)
KAWAHITO SHOJI (JP)
OGAWA HIROKI (JP)
SUZUKI TAKASHI (JP)
HAMAMATSU PHOTONICS KK (JP)
KAWAHITO SHOJI (JP)
OGAWA HIROKI (JP)
SUZUKI TAKASHI (JP)
International Classes:
G01S17/10; G01S7/4865
Foreign References:
| JPH0365678A | 1991-03-20 | |||
| JPH0735859A | 1995-02-07 | |||
| JPH11142519A | 1999-05-28 | |||
| JP2008076145A | 2008-04-03 | |||
| JP2003075534A | 2003-03-12 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
Yoshiki Hasegawa (JP)
Yoshiki Hasegawa (JP)
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Claims: