System for remote transmission of data and compensation of drifts

Claim 2

A telemetering system having at least one interrogatorreceiver station and at least one transponder station, comprising at said transponder station a generator for producing a linearly rising voltage, means for forming 2 n pulses which define in pairs n time intervals representing respectively a reference quantity and n-1 measured quantities, and further comprising at the interrogator-receiver station a direct current voltage linear integrator which operates during said n time intervals, a voltage comparator which measures the difference between the voltage corresponding to the reference quantity and a local standard reference voltage at the end of the fist time interval, said integrator being controlled by the comparator during the others of said intervals for correction of the integrations during said other n-1 time intervals.

Claim 3

A telemetering system as claimed in claim 1, wherein the pulses emitted by the transponder station or stations are modulated by different frequencies.

Claim 4

A telemetering system as claimed in claim 1, wherein each moving transponder station comprises an integrating amplifier, four threshold circuits coupled to said integrator, a logic and shaping device which receives the voltages produced by the threshold circuits, a monostable multivibrator driven by the logic device and a low-frequency oscillator whose coupling with the modulating stage of the transponder station is controlled by the monostable multivibrator.

Claim 5

A telemetering system as claimed in claim 3, wherein the interrogator-receiver station comprises an alternating-current amplifier, a direct current voltage source, an automatic changeover switch, the amplifier being connected to the source through the changeover switch, an integrating capacitor and a first automatic break switch which are associated in parallel with the amplifier, an automatic two-position changeover switch, a first memory capacitor connected to said second changeover switch, a second memory capacitor connected to a second position of the changeover switch, a second break switch connected in shunt across the second memory capacitor, a differential amplifier, an auxiliary reference voltage source, the differential amplifier being adapted to compare the voltage which is stored in the second memory capacitor with said auxiliary reference voltage, an amplifier, a third break switch as well as a resistor constituting a feedback channel for coupling said differential amplifier to the input of the alternating-current amplifier, the two changeover switches and the three break switches being actuated by he pulses emitted by the transponder station with which a communication is established.