The invention relates to a method for controlling the electromagnetic compatibility of a radar sensor having at least one transmitter edge pulse signal. The invention also relates to a radar sensor and an associated platform.
A platform is a hardware entity used especially in the military field. A ship, an aircraft, a land vehicle, an earth ground station or a space station are examples of such platforms.
The platforms are equipped with radar detectors and airborne radar.
radar detectors have the function of receiving and detecting the radar signals while airborne radars emit radar signals.
In some situations, the radar detector receives pulses from airborne radar.
Indeed, the study of the pulse received by a detector radar from an edge of radar shows that the received pulse, a direct component and the reflected components.
The direct component is due to the propagation of the pulse transmitted between the radar antenna and that the radar sensor, according to the shortest path. The direct component therefore arrives at the radar warning receiver delayed from the transmitted pulse, but first in relation to others that are reflected.
The reflected components are due to reflections of the transmitted pulse on all material objects reflecting the environment. Different types of objects reflectors can be distinguished according to their proximity to actors (antenna board radar antenna and the radar sensor). In the order of increasing distance, the first type corresponds to the reflective surfaces of the supporting platform in visibility of actors (for example a ship superstructures, a barrel), the second type corresponds to the earth's surface (primarily the sea or earth to a certain extent) serving continuously to the radio horizon, and the third type corresponds to the particular reflecting surfaces of finite dimension bounded in the direction of propagation,
Thus, the presence of airborne radar thus interfere with the operation of the radar warning receiver, either via the direct component and the reflected components of the first, second or third type.
It is therefore desirable that the operation of radar detectors is compatible with the airborne radar. This problem is usually called electromagnetic compatibility (EMC abbreviated with the acronym).
For this, it is known to use effective mitigation throughout the reception frequency band of the radar detector. Such attenuation is, for example, performed by a PIN diode (English Positive Intrinsic Negative) then serving switch.
However, such a mitigation involves cutting all the reception during discomfort phases, which reduces the probability of intercept radar warning on the radar signals of interest.
There is therefore a need, in the context of a platform equipped with a radar sensor and at least one emitter edge pulse signals, a method for control of electromagnetic compatibility ente the radar warning receiver and each emitter edge that is more efficient.
For this, the description discloses a method for controlling the electromagnetic compatibility of a radar sensor having at least one transmitter of edge pulse signals, the radar warning receiver and each transmitter board from the same platform by removing the clutter component in the signals received by the radar warning receiver, the method comprising a learning phase comprising, for each transmitter of a sub-board acquisition phase to obtain detected pulses, each pulse being characterized by characteristics, the characteristics comprising at least the date of arrival of the pulse in question and the carrier frequency of the pulse in question. The method comprises a sub-phase having the acquisition of signals from the pulses emitted by the
According to particular embodiments, the method comprises one or more of the following features, (s) alone or according to all technically possible combinations:
- the distribution is implemented using a histogram.
- the radar detector comprises an attenuator, elimination is implemented by use of the attenuator preventing detection of pulses belonging to the field of disposal.
- the radar detector comprises a computer, the elimination being implemented by the computer by removing the detected pulses belonging to the field of disposal.
- each transmitter edge is adapted to generate a synchronizing signal, learning and elimination phases being timed with the synchronization signal of each transmitter board.
- under-acquisition phase involves the formation and use of areas of acquisition.
- under-calculation phase is implemented twice, the distribution in the first implementation of the sub-phase calculation using raw features, the distribution in the second implementation of the sub-phase calculation using the second characteristic, the first and second characteristics and being distinct classes selected for the elimination phase being the classes selected for the first implementation of the calculation sub-stage and the selected classes in the second setting implementation of the sub-phase calculation.
pulse in question and the carrier frequency of the pulse in question. The method comprises a sub-phase having the acquisition of signals from the pulses emitted by the onboard transmitter considered and each corresponding to the clutter component to obtain the detected pulse, and the acquisition of pulse characteristics measurements detected, a subphase of calculation having the distribution of the detected pulses in classes with pulses where at least two features are of a common range of values, and selecting the class having a number of pulses greater than or equal to a predetermined threshold, to obtain the selected classes and an elimination phase comprising the construction of a field of elimination, a field of
The description also relates to a platform equipped with a radar detector.

WE CLAIMS

1. - A method of controlling the electromagnetic compatibility of a radar warning receiver (4) with at least one edge emitter (2) of pulse signals, the radar warning receiver (4) and each transmitter of edge (2) of the same platform, by removing the clutter component in the signals received by the radar warning receiver (4), the method comprising:
- a learning phase comprising, for each transmitter board (2):
- a sub-phase acquisition to obtain detected pulses, each pulse being characterized by features, the characteristics comprising at least the date of arrival of the pulse in question and the carrier frequency of the pulse in question, under the - phase comprising:
- acquisition of signals from the pulses emitted by the on-board transmitter (2) in question and each corresponding to the clutter component to obtain the detected pulses, and
- acquiring the pulses detected characteristics measurements,
- a sub-step of calculating comprising:
- the distribution of the detected pulses in classes with pulses where at least two features are of a common range of values, and
- selection of classes having a number of pulses greater than or equal to a predetermined threshold for the selected classes, and
- an elimination phase comprising:
- the construction of a field of elimination, a field of elimination being the set of pulses detected by the radar warning receiver (4) belonging to the selected class, and
- elimination in the signals received by the radar warning receiver (4) of pulses belonging to the field of disposal.
2. - Method according to claim 1, wherein the allocation is implemented using a histogram.
3. - Method according to claim 1 or 2, wherein the radar warning receiver (4) comprises an attenuator (1 1), the elimination is implemented by use of the attenuator (1 1) preventing the detection of pulses belonging to the field of disposal.
4. - Process according to any one of claims 1 to 3, wherein the radar sensor (4) comprises a computer (8), the removal being carried out by the computer (8) by removal of the detected pulses belonging to the field of disposal.
5. - Method according to any one of claims 1 to 4, wherein each transmitter board (2) is adapted to produce a synchronizing signal, learning and elimination phases being clocked with the signal synchronizing each transmitter board (2).
6. - Process according to any one of claims 1 to 5, wherein the sub-acquisition phase involves the formation and use of domain acquisition.
7. - Radar detector (4) comprising a receiver (6) of electromagnetic waves and a computer (8), the radar warning receiver (4) being configured to implement a control method of the electromagnetic compatibility of an radar warning receiver (4) with at least one edge emitter (2) of pulse signals, the radar warning receiver (4) and each transmitter of edge (2) belonging to the same platform, by removing the clutter component in the signals received by the radar warning receiver (4), the method comprising:
- a learning phase comprising, for each transmitter board (2):
- a sub-phase acquisition to obtain detected pulses, each pulse being characterized by features, the characteristics comprising at least the date of arrival of the pulse in question and the carrier frequency of the pulse in question, under the - phase comprising:
- acquisition of signals from the pulses emitted by the on-board transmitter (2) in question and each corresponding to the clutter component to obtain the detected pulses, and
- acquiring the pulses detected characteristics measurements,
- a sub-step of calculating comprising:
- the distribution of the detected pulses in classes with pulses where at least two features are of a common range of values, and
- selection of classes having a number of pulses greater than or equal to a predetermined threshold for the selected classes, and
- an elimination phase comprising:
- the construction of a field of elimination, a field of elimination being the set of pulses detected by the radar warning receiver (4) belonging to the selected class, and
- elimination in the signals received by the radar warning receiver (4) of pulses belonging to the field of disposal.
8. Platform equipped with a radar warning receiver (4) according to claim 7.