| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a radar system which solves problems of measurement errors due to processing in two systems and due to differences of path lengths and can measure an azimuth of an object accurately, and to provide a high-frequency module used therefor. <P>SOLUTION: The radar system comprises: a first antenna for receiving a signal; a second antenna for receiving the signal at a position differing from that of the first antenna; aΣΔcoupler which outputs a summation signal of a signal from the first antenna and a signal from the second antenna, and outputs a difference signal of the signal from the first antenna and the signal from the second antenna; a 90-degree phase shifter which shifts either the summation signal or the difference signal from theΣΔcoupler by 90 degrees and outputs it; and a selecting switch which selects either a signal from the 90-degree phase shifter or the other signal from theΣΔcoupler and outputs it. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
