US Pat. No. 9,520,654

SOURCE FOR PARABOLIC ANTENNA

ZODIAC DATA SYSTEMS, Les...

1. source for parabolic antenna, comprising:
a sigma radiating assembly adapted to generate the sigma channel comprising a sigma radiating element positioned on a main
transmission/reception axis of the source, and a sigma supply circuit for supplying the sigma radiating element, and

a delta radiating assembly adapted to generate the delta channel comprising eight delta radiating elements arranged about
the main transmission/reception axis of the source, and a delta supply circuit,

wherein the delta radiating elements are arranged on a circle centred on the main transmission/reception axis of the source
and the delta radiating elements are arranged with angular spacing of 45 degrees between two successive delta elements.

US Pat. No. 9,786,988

MULTIBAND SOURCE WITH COAXIAL HORN HAVING MONOPULSE TRACKING SYSTEMS FOR A REFLECTOR ANTENNA

Zodiac Data Systems, (FR...

1. A source for a reflector antenna, comprising:
a pseudo-cavity,
a first sigma excitation device for exciting the pseudo-cavity according to two orthogonal TE11 modes so as to generate a sum channel signal via a coaxial waveguide,

a second excitation device for exciting the pseudo-cavity according to two TE21 modes so as to generate a difference channel signal by quadrature combination of the two TE21 modes, the second device comprising eight probes distributed angularly around a main transmission axis of the source, and
a difference feed circuit for feeding the eight excitation probes according to the two TE21 modes,

wherein the difference feed circuit comprises four feed lines each feeding two probes diametrically opposite, each feed line
comprising a common feed branch and two terminal feed branches each connected on the one hand to the common feed branch at
a junction point and on the other hand to a respective excitation probe at an excitation point of the probe,

and wherein the terminal branches are dimensioned so that coupling of the sum channel signal with the eight excitation probes
of the difference channel generates a standing wave on the terminal feed branches,

the standing wave having an electrical field node at the junction point and a magnetic field node at each of the excitation
points of the probes.

US Pat. No. 10,716,081

SYSTEM FOR PROCESSING SIGNALS FROM AN EMITTER FOR THE PURPOSE OF DATING THE SIGNALS AND LOCATING THE EMITTER, AND ASSOCIATED RECEIVING STATION

Zodiac Data Systems, (FR...

1. Receiver station of a system for processing signals coming from a transmitter to be located, the receiving station being configured for acquiring signals coming from the transmitted to be located and signals coming from at least one a satellite navigation system said receiver station, comprising:a local clock generating a local time base;
a first receiver configured to acquire signals coming from a transmitter to be located;
a second receiver configured to acquire signals coming from a satellite navigation system;
wherein the first receiver and the second receiver are synchronised by the local clock, the acquired signals being dated by said time base.

US Pat. No. 10,382,116

RADIO COMMUNICATION RECEIVER CANCELLING OUT THE CROSS POLARISATION OF A RECEIVED SIGNAL

Zodiac Data Systems, (FR...

1. A radio communications receiver receiving a radio signal comprising a main polarisation and a secondary polarisation orthogonal to the main polarisation, the receiver comprising:a receiving unit for receiving the main polarisation and for receiving the secondary polarisation of the received signal, synchronized as carrier frequency on the main polarisation;
a cancellation unit for canceling the secondary polarisation synchronized on the main polarisation (and configured to cancel, from the received signal, interference due to the secondary polarisation, the cancellation unit comprising a filtering unit receiving at input the main polarisation and the secondary polarisation to:
filter the components in phase of the secondary polarisation contributing to interference of the main polarisation, for its components in phase and in quadrature;
filter the components in quadrature of the secondary polarisation contributing to interference of the main polarisation, for its components in phase and quadrature; and
add the components filtered in this way to the components in phase and in quadrature of the main polarisation such that the filtered signal coming from the filtering unit deletes the contribution of the secondary polarisation on the main polarisation, the filtered signal coming from the filtering unit comprising only the contribution of the main polarisation; and
a demodulation unit for demodulation of the filtered signal, located downstream of the cancellation unit and configured to:
calculate a carrier frequency error information;
calculate offset information of the rhythm symbol; and
communicate, by retroaction to the upstream receiving unit, said calculated carrier frequency error information and said offset information of the rhythm symbol, to synchronize in frequency and rhythm said receiving unit so that the main polarisation and the secondary polarisation are synchronized in frequency and rhythm.

US Pat. No. 10,700,407

ACQUISITION AID ANTENNA DEVICE AND ASSOCIATED ANTENNA SYSTEM FOR MONITORING A MOVING TARGET

Zodiac Data Systems, (FR...

1. An antenna system for monitoring a moving target, comprising: a main antenna device comprising:a parabolic reflector capable of reflecting radiation emitted by a target according to a first reception diagram having a first main reception lobe having a first aperture angle,
a main antenna source capable of receiving the radiation reflected by the parabolic reflector, and
an acquisition aid antenna device fixedly mounted relative to the main antenna device, comprising:
a multiband acquisition aid antenna source, capable of receiving radiation emitted by the target according to a second reception diagram having a second main reception lobe having a second aperture angle, and a lens disposed in the second main reception lobe of the acquisition aid antenna source for concentrating the radiation received from the target to the acquisition aid antenna source, so as to receive the radiation emitted by the target according to a third reception diagram having a third main reception lobe having a third aperture angle less than the second aperture angle and greater than the first aperture angle.