Active cancellation stealth is a significant developing direction in modern stealth technology field. In this paper, according to characteristics of linear frequency modulated (LFM) signal and nonlinear frequency modulated (NLFM) signal, the cancellation signal was designed. An important parameter called cancellaty which is used to measure the effect of cancellation is proposed. The basic theor...

Digital pulse compression is the technique to convert short pulse to long pulse because energy content of long pulse with low peak power would be the same with short pulse having high peak power. In this paper pulse compression is performed by Matched Filter in signal processing environment. At some finite interval of time the high peak amplitude of signal with narrow bandwidth gives the energy...

As the useful time-frequency tool, the Fractional Fourier Transform (FRFT) and the Short Time Fourier Transform (STFT) have a great development of signal recognition. And the Reduced Fractional Fourier Transform (RFRFT) was recently proposed and has been used in the recognition and estimation of chirp signals. A new method based on STFT and RFRFT is presented for radar signals modulation recogn...

Amplitude modulation (AM) and frequency modulation (FM) in speech signals are believed to reflect various non-linear phenomena during the speech production process. In this paper, the amplitude and frequency modulation patterns are analyzed for the first three speech resonances in relation to the fundamental frequency (F0). The formant tracks are estimated, and the resonant signals are extracte...

-The Linear Frequency Modulation (LFM) waveform is the most commonly and extensively used signal in practical radar system. This paper introduces a new scheme of Piecewise Nonlinear Frequency Modulation (PNFM) for generating good code sets. Each code set has good autocorrelation with small peak sidelobes and cross-correlation. A weighting function is usually applied in order to reduce the sidel...

Abstract For purpose of solve the problem poor discrimination and robustness intra-pulse signal features extracted by traditional methods, this paper proposes a radar modulation type recognition algorithm based on improved residual network. Firstly, one-dimensional time-domain is converted into two-dimensional time-frequency image Smoothing Pseudo Wigner-Ville Distribution; Then preprocessed; R...

It is well known that using proper signal compression techniques, the range resolution of the radar systems can be enhanced without having to increase the peak transmits power. Whereby the range resolution is inverse proportional with the frequency band of the scanning signals, in the last period of time, in radar systems literature a lot of suitable wideband signals were designed and analyzed ...

The technique of estimating the complex frequency components a signal in presence noise based on assumptions about number is known as estimation. problem estimation appears when we receive from transmitter with frequency, and it often radar, sonar, etc. applications. This has been dealt by various techniques algorithms. research shows methods used researchers to estimate paper discusses between...