Although modern radar signal processing can provide both range and range-rate measurements, this measurement type is not always available in SSA. 
Most papers can be obtained for academic purpose via https://sci-hub.tw, see Several ways that shouldn't be used to download learning materials.
- Hyun Chul Ko, and Daniel J. Scheeres, “Maneuver Detection with Event Representation Using Thrust Fourier Coefficients”, Journal of Guidance, Control, and Dynamics, vol. 39, 2016, pp. 1080–1091. [Link].