Digital mixing-free orthogonal demodulation method, device and system

The invention relates to a digital mixing-free orthogonal demodulation method, device and system, and the method comprises the steps: obtaining a low-frequency signal from a high-frequency signal through high local oscillator down-conversion at a transmitting end of a radar system, and converting a multi-frequency intermediate-frequency collection signal into a baseband I signal and a baseband Q signal at a receiving end through employing a same set of digital mixing-free orthogonal demodulation correction symbols; according to the method and the device, the mixing and digital mixing-free orthogonal demodulation principles are utilized, the same set of program is adopted to realize digital mixing-free orthogonal demodulation of signals of different frequency bands, a digital mixing-free orthogonal demodulation program and a subsequent data processing program are simplified, and the method and the device can be widely applied to ground station systems, optimization systems and single-machine design. 本申请涉及一种数字免