Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation
Reexamination Certificate
2005-02-22
2005-02-22
Lobo, Ian J. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With frequency modulation
C342S107000, C342S109000, C342S374000
Reexamination Certificate
active
06859168
ABSTRACT:
Disclosed is a radar apparatus which receives a transmitted signal reflected from an object by switching between a plurality of antennas, wherein the plurality of antennas are divided into a plurality of groups, and at least one of the plurality of antennas contained in each of the groups is a common antenna. The radar apparatus comprises: a selector switch section having a plurality of selector switches each for sequentially and selectively switching output terminals of the plurality of antennas and the common antenna contained in a corresponding one of the groups for connection to an input terminal; a plurality of channels each having an A/D converter and a downconverting section for downconverting a received signal that has been input from each of the antennas to the input terminal via a corresponding one of the plurality of selector switches; and a digital signal processing section for receiving an output from the A/D converter of each of the channels, wherein the digital signal processing section applies prescribed processing to detect the distance to or the relative velocity of the object.
REFERENCES:
patent: 4184154 (1980-01-01), Albanese et al.
patent: 5955991 (1999-09-01), Kawakubo
patent: 6445339 (2002-09-01), Yamada
patent: 6573859 (2003-06-01), Tokoro
patent: 20040164892 (2004-08-01), Shinoda et al.
patent: 0 919 828 (1999-06-01), None
patent: 1 076 244 (2001-02-01), None
patent: 11-160423 (1999-06-01), None
Search Report of Corresponding European Application No. 04251455.4, dated Jul. 15, 2004.
Christie Parker and Hale, LLP
Fujitsu Ten Limited
Lobo Ian J.
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