CALIBRATION DEVICE

摘要

PROBLEM TO BE SOLVED: To measure accurate delay characteristics and amplitude characteristics of a radio receiving part and a radio transmitting part by using a signal having the same band as a modulation signal that is actually is used for communication as a calibration signal and detecting a correlation output with which an output signal from each radio receiving part is subjected to correlation detection. SOLUTION: A calibration signal 101 is generated by a code generator 103, is demodulated by a demodulator circuit 102 and is inputted to a radio transmitting part 104. After a transmission signal is subjected to orthogonal modulation in the part 104, it is outputted from a transmitting terminal 105. Receive outputs of radio receiving parts 107 and 108 are respectively inputted to complex correlators 111 and 112 and the correlators 111 and 112 perform correlation detection in a timing adjusted by a timing control circuit 113 and output correlation outputs 114 and 115. A detection circuit 116 calculates delay characteristics (amplitude ratio and phase difference) 117 and 118 by respectively comparing receive signal points calculated from the outputs 114 and 115 with an identification point being a reference.