Abstract: A crystal oscillator compensation circuit (13) has an oscillator crystal (12) excited by a piezoelectric oscillator circuit (19), whereby the frequency (f) can be shifted in certain limits by means of a variable-capacity diode (14). The crystal temperature is measured by a temperature sensor (17) which retransmits a temperature signal by means of an analog/digital converter (22) to a microprocessor with a bus (24), and input/output port (15), a PROM (16) and a logic circuit (18). This microprocessor calculates, on the basis of the temperature signal allowing for a known regularity and characteristic numbers stored in the PROM memory for the crystal concerned, a temperature compensation signal which is transmitted by means of a D/A converter (21) to the variable-capacity diode. The temperature compensation signal (U.sub.

Abstract: The novel radar device (1) radiates triangularly frequency-modulated continuous-wave signals via two radiation patterns (3, 4). If an object (2) is detected by one radiation pattern at a time, relative velocity (V.sub.1, V.sub.2) and distance (r.sub.1, r.sub.2) are measured. The time between the measurements with signals received via the first and the second radiation pattern, respectively, is t. If the velocity of the object (2) relative to the radar device is V.sub.1 =0 when it is detected by the first radiation pattern, the associated distance is r.sub.10. The velocity of the object is determined either by the equation ##EQU1## or by either of the equations ##EQU2## A combination of V.sub.A and V.sub.B is also possible. If the object is so large in extent as to be detected by both radiation patterns simultaneously, switchover between the two radiation patterns is effected at a given clock rate.If no pairs of values are used at which V.sub.

Abstract: Light pulses periodically produced by a light source are each split into two pulses by an optical splitter and so introduced into a closed optical optical-fiber loop having at least one turn that they travel through the optical-fiber loop in opposite directions. After each circulation, a part of the pulses is extracted and fed to at least two adjacent optical/electrical transducers.The position of the interference pattern obtained by heterodyning is so controlled that an extreme value of the intensity distribution is present at the line of contact of the optical/electrical transducers. From the output signals of the optical/electrical transducers, a sum signal and a difference signal are formed. The sum signals are used to eliminate the amplitude dependence of the different signals. The rotation rate is determined from the difference between the difference signals assigned to two successive circulations around the optical-fiber loop.