초록 ▼

Disclosed is a radar system capable of obviating a problem that a sufficient improvement of an S/N ratio could not be obtained in the prior art, and comprising a transmitter/receiver for detecting a phase of a receiving signal reflected from an observation target, an A/D converter for converting the

Disclosed is a radar system capable of obviating a problem that a sufficient improvement of an S/N ratio could not be obtained in the prior art, and comprising a transmitter/receiver for detecting a phase of a receiving signal reflected from an observation target, an A/D converter for converting the receiving signal into a digital signal, a range gate for extracting the receiving signal having a time corresponding to the predetermined pulse width, a data dividing unit for dividing the receiving signals in to two groups of data, an FFT unit for fast-Fourier-transforming one group of data of the two groups of data, an FFT unit for fast-Fourier-transforming the other group of data, a complex conjugating unit for taking a complex conjugate of an output of the FFT unit, a complex multiplying unit for performing a complex multiplication for the every same Doppler frequency component with respect to an output of the former FFT unit and an output of the complex conjugating unit, and a complex adder for executing a coherent addition of a result of the complex multiplication the same number of times as the repetitions with respect to the same Doppler frequency component. The receiving signals can be coherently integrated both in the pulse and between the pulses, and the S/N ratio can be improved.

대표청구항 ▼

1. A radar system comprising:a transmitter/receiver for transmitting repeatedly electromagnetic waves which are pulse-modulated with a predetermined pulse width at a predetermined pulse interval, and detecting a phase of a receiving signal reflected from an observation target; A/D converting means f

1. A radar system comprising:a transmitter/receiver for transmitting repeatedly electromagnetic waves which are pulse-modulated with a predetermined pulse width at a predetermined pulse interval, and detecting a phase of a receiving signal reflected from an observation target; A/D converting means for converting the receiving signal into a digital signal at a predetermined sampling interval; range gate means for extracting the receiving signal having a time corresponding to the predetermined pulse width at an interval of a delay time corresponding to a distance from the observation target; data dividing means for dividing the receiving signals into two groups of data, which come from the observation target located at the same distance; first Doppler FFT means for fast-Fourier-transforming one group of data of the two groups of divided data; second Doppler FFT means for fast-Fourier-transforming the other group of data of the two groups of divided data; complex conjugating means for taking a complex conjugate of an output of said second Doppler FFT means; complex multiplying means for performing a complex multiplication for the every same Doppler frequency component with respect to an output of said first Doppler FFT means and an output of said complex conjugating means; and complex adding means for repeating the observation and processing a plural number of times, and coherently adding an obtained result of the complex multiplication the same number of times as the repetitions with respect to the same Doppler frequency component.