Line spectrum feature enhancement method and system based on phase gradient error estimation technology

The invention discloses a line spectrum feature enhancement method and system based on a phase gradient error estimation technology. The method comprises the following steps: 1, obtaining an observation array signal; 2, roughly estimating a target orientation based on ideal array beam forming; 3, performing conventional beam forming processing based on the estimated target azimuth to obtain tracking beam data of the target direction, estimating a broadband continuous spectrum based on the data, and performing background equalization processing on the tracking beam data; 4, detecting L strong line spectrums of the target signal based on a threshold technology; and 5, eliminating linear time delay. And 6, estimating secondary and high-order time delay gradients between adjacent array elements based on the strong line spectrum after cyclic shift. And 7, carrying out gradient integration on the estimated time delay to obtain time delay estimation of each array element relative to the reference array element. And