Thomson-csf

U.S. Philips Corporation

Telecommunications Radioelectriques Et Telephoniques

Marc Chelouche

Jean-Luc De Gouy

Lionel Fousset

Roger P Alexis

Claude Pirolli

Francois Magne

Laurent Collin

Linearizing device for a frequency-modulation ramp and its application to a radio altimeter

Device for continuous phase modulation by frequency synthesizer with

An information transmission arrangement comprising transceiver units (1, 2) located in a propagation medium (10) whose attentuation varies as a function of frequency. At least one unit (1) comprise a meter (67) for measuring the level of the received signal in order to influence the frequency variation control (32) of the control oscillator (28) in the send circuit (26, 28) of the other unit (2). This arrangement profits from a monotonic attenuation gradient of the propagation medium (10) having a zone (Z1) in the 50-60 GHz band to control the send level in a simple and effective manner.

Transceiver arrangement for optimizing received signal levels

A control circuit (10) controls a voltage controlled oscillator (15) to cause the signal at the output of the oscillator to have slopes of frequency variation in accordance with biphase encoded data to be transmitted. The control circuit (10) limits abrupt frequency shifts in the oscillator output signal by inverting a sign multiplying the slope of frequency variation, utilizing an amplifier (50) with a controllable inversion state, in response to whether the state of the data to be transmitted, and a state, indicative of whether a frequency control voltage exceeds a zero threshold at sampling instants synchronous with the biphase data, are the same or different.

Information transmission arrangement using frequency modulation

Growing community of inventors

Sannois, France

Marc Chelouche