关键词: 时频分析, 反辐射导弹, Chirplet变换, 信号检测, 时频原子

Abstract: Based on the characteristics of Anti-Radiation-Missile (ARM) echo wave, 3 parameters Chirplet Transform (CT) was proposed from the perspective of parameterized Time-Frequency (TF) analysis, which combining 3 kinds of affine TF transform to be a kind of TF atom. What's more, based on the time-shift feature of ARM and aircraft echo wave's 3 parameters CT, a new method of ARM detection which can be implemented fast by Fast Fourier Transform (FFT) algorithm was proposed, considering the difference of the 3 parameters CT's modulus between the received signal and its delay signal as the detectable quantity. Aircraft echo interference could be counteracted effectively, while ARM echo energy could be saved without much attenuation. Therefore, the detection system was simplified. Computer simulation results show that ARM can be detected fast and precisely by this way in the surrounding of high aircraft echo interference and low Signal to Noise Ratio (SNR), so that a reliable early warning of ARM launching can be achieved.

Key words: Time-Frequency Analysis, Anti-Radio Missile (ARM), Chirplet Transform, Signal Detection, Time-Frequency Atom