Transmit method based on satellite massive mimo integrated sensing and communication

A transmit method based on satellite massive Multiple-Input Multiple-Output (MIMO) integrated sensing and communication, characterized in that, a satellite end is equipped with a massive MIMO antenna array which simultaneously serves multiple users and detects multiple targets, wherein communication and sensing use the same spectrum resources and the same hardware platform, and integrated sensing and communication is implemented by transmitting a signal to focus on communication or sensing;

• the satellite end estimates statistical status information of electromagnetic wave propagation according to received uplink and downlink pilot signals, wherein for a communication process, the statistical status information of electromagnetic wave propagation is a channel gain and a channel direction vector between the satellite end and user terminals;
• and for a sensing process, the statistical status information of electromagnetic wave propagation is angles of departure of the targets;
• according to the statistical status information of electromagnetic wave propagation, the satellite end transmits a directional beam to a detection target and a downlink signal to each user terminal by means of integrated sensing and communication precoding;
• and during the dynamic movement of the satellite and the user terminals as well as the targets, with the change in the statistical status information of electromagnetic wave propagation between the satellite and the user terminals as well as the targets, the integrated sensing and communication precoding is updated.