Radar system and the coherent integration method

摘要

PROBLEM TO BE SOLVED: To solve such a problem that a ratio of signal to noise power has not been improved enough, conventionally. ;SOLUTION: This radar device comprises a transmitter/receiver 1 for detecting a phase of a received signal which has been reflected from an observed object; A/D converting means 2 for converting the received signal into a digital signal; range gate means 3 for extracting a received signal of a time corresponding to a pulse width; data dividing means 6 for dividing the received signal into two data; FFT means 4a for transforming one of two data with fast Fourier transform; FFT means 4b for transforming the other data with fast Fourier transform; complex conjugate means 7 for taking complex conjugate of an output from the FFT means 4b; complex multiplication means 8 for carrying out complex multiplication of an output from the FFT means 4a by an output from the complex conjugate means 7 for every same Doppler frequency component; and complex addition means 9 for carrying out coherent addition of complex multiplication result the repetition number of times for the same Doppler frequency component. According to this constitution, a ratio of signal to noise power by carrying out coherent integration of a received signal both within a pulse and at an interval between pulses.;COPYRIGHT: (C)2001,JPO