Communications: directive radio wave systems and devices (e.g. – Testing or calibrating of radar system – By monitoring
Reexamination Certificate
2005-06-15
2008-09-30
Pihulic, Dan (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Testing or calibrating of radar system
By monitoring
C342S173000
Reexamination Certificate
active
07429947
ABSTRACT:
A radar apparatus includes a plurality of receiver circuit systems to correspond with a plurality of receiving antennas. Channel signals having the same characteristics are generated by the switching operation of a second switch from a received channel signal received by an antenna selected by a first switch, and the thus generated signals are input to the respective receiver circuit systems. Any change in characteristic is detected by comparing signal level and phase between the channel signals converted from analog to digital. The characteristic of each receiver circuit system or the characteristic of each A-D converted output signal is corrected based on the result of the detection of each receiver circuit system. Any change detected in the characteristic of a receiver circuit system is corrected during normal operation, and any change occurring in the characteristic due to aging or temperature variations in the operating environment is corrected as needed.
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Fogg & Powers LLC
Fujitsu Ten Limited
Pihulic Dan
Taylor Gregory M.
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