Time delay correction method, time delay correction apparatus and time delay correction system

The invention provides a time delay correction method, a time delay correction apparatus and a time delay correction system. The time delay correction apparatus comprises a first transmit-receive interface which is used for communication of a transceiver; a second transmit-receive interface which is used for communicating with an antenna group; a radio frequency unit which is used for coupling a first radio frequency signals sent by any transmission channel of the transceiver and received by the first transmit-receive interface to the second transmit-receive interface to make the first radio frequency signals sent to the antenna group, and which is used for frequency mixing of the first radio frequency signals received by the second transmit-receive interface and returned by the antenna group, and coupling obtained second radio frequency signals to the first transmit-receive interface to make the second radio frequency signals sent to at least two receiving channels of the transceiver respectively through the first transmit-receive interface. The embodiments of the invention increase time delay accuracy of the obtained at least two receiving channels and at least two sending channels, improve the time delay correction accuracy, and meet the time delay error requirements of MIMO closed rings.