A signal determining method, comprising: receiving, by a signal receiving device, configuration information sent by a signal sending device, and determining a time alignment error, TAE, between at least two subcarriers used by the signal sending device to transmit a reference signal, wherein the signal receiving device is a to-be-positioned mobile terminal or a reference node, the signal sending device is a reference node if the signal receiving device is a to-be-positioned mobile terminal, or the signal sending device is a to-be-positioned mobile terminal if the signal receiving device is a reference node, the reference node is configured to position the to-be-positioned mobile terminal, and the configuration information comprises reference signal configuration information that is set for each of the at least two subcarriers; generating, by the signal receiving device, a reference signal on each of the at least two subcarriers according to the reference signal configuration information in the configuration information, and generating a first aggregated reference signal based on the generated reference signal and the determined TAE; and after receiving a signal, matching, by the signal receiving device, the signal against the first aggregated reference signal, and when the signal matches the first aggregated reference signal, determining that the signal is a second aggregated reference signal sent by the signal sending device, wherein the second aggregated reference signal is generated after the signal sending device performs carrier aggregation on the reference signal sent on each of the at least two subcarriers. receiving, by a signal receiving device, configuration information sent by a signal sending device, and determining a time alignment error, TAE, between at least two subcarriers used by the signal sending device to transmit a reference signal, wherein the signal receiving device is a to-be-positioned mobile terminal or a reference node, the signal sending device is a reference node if the signal receiving device is a to-be-positioned mobile terminal, or the signal sending device is a to-be-positioned mobile terminal if the signal receiving device is a reference node, the reference node is configured to position the to-be-positioned mobile terminal, and the configuration information comprises reference signal configuration information that is set for each of the at least two subcarriers; generating, by the signal receiving device, a reference signal on each of the at least two subcarriers according to the reference signal configuration information in the configuration information, and generating a first aggregated reference signal based on the generated reference signal and the determined TAE; and after receiving a signal, matching, by the signal receiving device, the signal against the first aggregated reference signal, and when the signal matches the first aggregated reference signal, determining that the signal is a second aggregated reference signal sent by the signal sending device, wherein the second aggregated reference signal is generated after the signal sending device performs carrier aggregation on the reference signal sent on each of the at least two subcarriers.