A system for measuring axial shift and radial gap of rotating components of gas turbine engines, the system comprising: a processor; and a tangible, non-transitory memory configured to communicate with the processor, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the processor, cause the processor to perform operations comprising: receiving, by the processor, a first time variant voltage signal (904") from a first blade tip clearance sensor, wherein in response to an axial shift in a rotating component the first blade tip clearance sensor is configured to generate a position variant response in the first time variant voltage signal (904"); and wherein the system is characterised by the operations further comprising: receiving, by the processor, a second time variant voltage signal (906") from a second blade tip clearance sensor, wherein in response to an axial shift in a rotating component the second blade tip clearance sensor is configured to generate a relatively steady state response in the second time variant voltage signal (906"); and determining, by the processor, the axial position of the rotating target based on a voltage variance between the first time variant voltage signal (904") and the second time variant voltage signal (906"), wherein the voltage variance with respect to time is relatively steady state for each of the first time variant voltage signal (904") and the second time variant voltage signal (906"). a processor; and a tangible, non-transitory memory configured to communicate with the processor, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the processor, cause the processor to perform operations comprising: receiving, by the processor, a first time variant voltage signal (904") from a first blade tip clearance sensor, wherein in response to an axial shift in a rotating component the first blade tip clearance sensor is configured to generate a position variant response in the first time variant voltage signal (904"); and wherein the system is characterised by the operations further comprising: receiving, by the processor, a second time variant voltage signal (906") from a second blade tip clearance sensor, wherein in response to an axial shift in a rotating component the second blade tip clearance sensor is configured to generate a relatively steady state response in the second time variant voltage signal (906"); and determining, by the processor, the axial position of the rotating target based on a voltage variance between the first time variant voltage signal (904") and the second time variant voltage signal (906"), wherein the voltage variance with respect to time is relatively steady state for each of the first time variant voltage signal (904") and the second time variant voltage signal (906"). receiving, by the processor, a first time variant voltage signal (904") from a first blade tip clearance sensor, wherein in response to an axial shift in a rotating component the first blade tip clearance sensor is configured to generate a position variant response in the first time variant voltage signal (904"); and wherein the system is characterised by the operations further comprising: receiving, by the processor, a second time variant voltage signal (906") from a second blade tip clearance sensor, wherein in response to an axial shift in a rotating component the second blade tip clearance sensor is configured to generate a relatively steady state response in the second time variant voltage signal (906"); and determining, by the processor, the axial position of the rotating target based on a voltage variance between the first time variant voltage signal (904") and the second time variant voltage signal (906"), wherein the voltage variance with respect to time is relatively steady state for each of the first time variant voltage signal (904") and the second time variant voltage signal (906"). receiving, by the processor, a second time variant voltage signal (906") from a second blade tip clearance sensor, wherein in response to an axial shift in a rotating component the second blade tip clearance sensor is configured to generate a relatively steady state response in the second time variant voltage signal (906"); and determining, by the processor, the axial position of the rotating target based on a voltage variance between the first time variant voltage signal (904") and the second time variant voltage signal (906"), wherein the voltage variance with respect to time is relatively steady state for each of the first time variant voltage signal (904") and the second time variant voltage signal (906").