Frequency and arrival angle joint estimation method based on undersampled signal

The invention discloses a frequency and arrival angle joint estimation method based on an undersampled signal, and belongs to the technical field of multi-parameter joint estimation in cognitive radio. The invention aims to solve the problem of high complexity of an undersampling structure of an existing modulation broadband converter. The method comprises the steps that firstly, an undersamplingstructure is constructed, original signals are collected through a sensor, an analog-digital converter conducts undersampling on signals transmitted by the sensor and signals obtained after time delaytau and then transmits the signals to a low-pass filter, and the low-pass filter outputs undersampling data; Fourier transform is performed on the original signal to obtain a transformed time domainsignal; the analog-to-digital converter performs low-speed sampling on the transmitted data and converts the data into a frequency spectrum to be output; a low-pass filter processes the frequency spectrum and converts the frequ