DETECTION METHOD FOR FAULT LOCATION OF PHASE SHIFTER FOR PHASED ARRAY ANTENNA AND DETECTION METHOD FOR PHASE ERROR OF FEEDING SYSTEM OF THE PHASED ARRAY ANTENNA

摘要

PROBLEM TO BE SOLVED: To locate a fault in a phase shifter by comparing a spectral signal of a harmonic component of a Fourier transformation output being reference data when each phase shifter is entirely normal with a measured spectral signal. ;SOLUTION: A monitor antenna 3 monitors a transmission signal from a phased array antenna 1 and a monitor detector 4 detects the phase. A Fourier transformation arithmetic section 10 applies Fourier transformation to part of monitor outputs received by a CPU 7 via an A/D converter 5 and an I/O device 6. Monitor outputs when each of phase shifters P1, P2,..., PN shifts a phase of an input sequentially one by one when all the phase shifters P1, P2,..., PN are normal are Fourier-transformed and stored in a reference data memory 11 of the CPU 7 as reference data. A comparison/discrimination section 12 compares the reference data read from the reference data memory 11 with a measured spectral signal of the monitor output so as to discriminate whether or not any phase shifter is faulty.;COPYRIGHT: (C)1997,JPO