Embodiments of the application disclose a method, an apparatus, and a system. The method includes: taking a first receiving and sending channel as a reference correction channel in a first radio frequency module, correcting a channel response ratio of each receiving and sending channel in the first radio frequency module, so that the channel response ratio of each receiving and sending channel in the first radio frequency module is consistent with a channel response ratio of the first receiving and sending channel; taking the first receiving and sending channel and a second receiving and sending channel as correction channels of the first radio frequency module and a second radio frequency module, correcting a channel response ratio of the second receiving and sending channel, so that the channel response ratio of the second receiving and sending channel is consistent with the channel response ratio of the first receiving and sending channel.