Method and system for hybrid modulation and demodulation

A hybrid modulation method, comprising:

• inputting a hybrid signal of a space-ground link system (SGLS), the hybrid signal including a first component and a second component;
• performing a double sideband (DSB) modulation on the first component of the hybrid signal utilizing a carrier frequency to obtain a first waveform;
• performing a single sideband (SSB) modulation on the second component of the hybrid signal utilizing the carrier frequency to obtain a second waveform;
• mixing the first waveform with double sidebands and the second waveform with a single sideband to generate a hybrid waveform with mixed double sidebands and single sideband;
• and
• transmitting the hybrid waveform for the SGLS with reduced bandwidth and improved spectrum efficiency.

A hybrid demodulation method, comprising:

• receiving a hybrid waveform of a space-ground link system (SGLS);
• determining a carrier frequency of the hybrid waveform;
• obtaining a first waveform by passing the received hybrid waveform through a first bandpass filter and a second waveform by passing the received hybrid waveform through a second bandpass filter, wherein the first waveform includes a command signal and the second waveform includes a telemetry signal and a ranging signal;
• performing, based on the carrier frequency, a double sideband (DSB) demodulation on the first waveform to obtain a first demodulated signal;
• and
• performing, based on the carrier frequency, a single sideband (SSB) demodulation on the second waveform to obtain a second demodulated signal.