| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress the deterioration of an estimation precision for the arrival angle of a target by properly correcting in real time the quantity of phase deviation incurred between an I signal and a Q signal after the quadrature detection of a signal reflected by the target. <P>SOLUTION: A high frequency transmission signal is transmitted from a transmit antenna in a predetermined transmission period, and the signal of a reflection wave reflected by a target is received by a receive antenna. First and second sub code sequences have a sub code length obtained by dividing a code sequence of a predetermined code length, and third, fourth, fifth and sixth sub code sequences are obtained by multiplying each of the first and second sub code sequences by two kinds of different coefficients. During the first transmission period, a first transmission signal is produced by modulating a code obtained by concatenating the third sub code sequence and the fourth sub code sequence. During a second transmission period, a second transmission signal is produced by concatenating the fourth sub code sequence and the fifth sub code sequence. The produced first and second transmission signals are converted into high frequency transmission signals and transmitted from the transmit antenna. <P>COPYRIGHT: (C)2012,JPO&INPIT |
