The invention provides a communication
signal modulating and identifying method based on generalized S transformation. The communication
signal modulating and identifying method comprises the following steps of: (1) carrying out
analytic signal configuration on an input modulating
signal according to the characteristic of an input
signal to noise ratio modulating signal to obtain an
analytic signal to be used as a signal for carrying out generalized S transformation; (2) configuring a
Gaussian window function needed by the generalized S transformation; (3) determining a
Gaussian window width factor sigma according to an expression formula of the generalized S transformation; carrying out the generalized S transformation on an input modulation signal by combining short-time Fourier transformation and the
Gaussian window function to obtain time-frequency
energy distribution images of the modulation signal; and (4) comparing energy images of all modulation signals according to the time-frequency
energy distribution images obtained by the step (3) to find out a difference between the time-frequency
energy distribution images of all modulation signals which are subjected to the generalized S transformation; selecting a frequency strip quantity with concentrated energy, a maximum value ratio of high-frequency component energy to low-frequency component energy, energy
time domain distribution, high-frequency and low-frequency component extreme value
time domain distribution and high-frequency component extreme value distribution so as to identify all modulation signals. According to the invention, a high
identification rate is achieved under the condition of a low
signal to noise ratio, and the method is suitable for modulating and identifying communication signals under a heavy
clutter environment.