An apparatus, comprising: a housing including a first downhole component variably, rotationally coupled to a second downhole component, wherein the first downhole component comprises a first spatial orientation package and the second downhole component comprises a second spatial orientation package, wherein the first and second spatial orientation packages (SO1, SO2) provide an absolute reference for the spatial orientations of the first downhole component and the second downhole component; at least one tilted transmitter (T x) attached to the first downhole component and at least one tilted receiver (R x) attached to the second downhole component; and a processor housed by the housing, the processor configured to: determine spatial orientations of the at least one tilted receiver relative to the at least one tilted transmitter, at common points in time during rotation of the first and the second downhole components using the first and second spatial orientation packages; derive rotational speed of the first and the second downhole components from the spatial orientations; and transform raw measurements of transmitter signals provided by the at least one tilted receiver into calibrated measurements based on the spatial orientations and the rotational speeds of the first and the second downhole components at the common points in time. a housing including a first downhole component variably, rotationally coupled to a second downhole component, wherein the first downhole component comprises a first spatial orientation package and the second downhole component comprises a second spatial orientation package, wherein the first and second spatial orientation packages (SO1, SO2) provide an absolute reference for the spatial orientations of the first downhole component and the second downhole component; at least one tilted transmitter (T x) attached to the first downhole component and at least one tilted receiver (R x) attached to the second downhole component; and a processor housed by the housing, the processor configured to: determine spatial orientations of the at least one tilted receiver relative to the at least one tilted transmitter, at common points in time during rotation of the first and the second downhole components using the first and second spatial orientation packages; derive rotational speed of the first and the second downhole components from the spatial orientations; and transform raw measurements of transmitter signals provided by the at least one tilted receiver into calibrated measurements based on the spatial orientations and the rotational speeds of the first and the second downhole components at the common points in time. determine spatial orientations of the at least one tilted receiver relative to the at least one tilted transmitter, at common points in time during rotation of the first and the second downhole components using the first and second spatial orientation packages; derive rotational speed of the first and the second downhole components from the spatial orientations; and transform raw measurements of transmitter signals provided by the at least one tilted receiver into calibrated measurements based on the spatial orientations and the rotational speeds of the first and the second downhole components at the common points in time.