Abstract: A radio navigation system including:a means to determine, at a point (M.sub.1) of the trajectory of a moving body to be localized, the speed vector of said moving body and, possible, the "n" order derivatives of said speed vector (with n>1),a means to perform at least three successive measurements of distance, respective between a geodesic point at the ground and three successive positions (M.sub.1, M.sub.2, M.sub.3) of said moving body,a means to computer the position (M.sub.3) of said moving body by resolving a system of equations from the results thus obtained, expressed in one and the same reference system.

Abstract: Laser telemetry and Doppler measurement apparatus using pulse compression has a transmitter for providing a periodic pulsed transmission laser wave having a pair of pulses, one pulse being frequency modulated on one side of a main frequency F.sub.E, and the other pulse being frequency modulated on the other side of the main frequency F.sub.E. The transmitter also provides a reference laser wave having a frequency F.sub.L. A photomixer is adapted for superheterodyne reception of the reference laser wave and a return laser signal which has been reflected from a target. The return laser signal has a Doppler shift frequency F.sub.D. The photomixer provides a beat signal having a frequency F.sub.I plus F.sub.D, where F.sub.I is an intermediate frequency. A Doppler aquisition loop transposes the beat signal frequency and provides a transposed signal to compensate for the Doppler shift. The Doppler acquisition loop provides a coarse compensation signal having a frequency near the frequency F.sub.D.