Abstract: A multistatic radar surveillance system includes transmitter elements and receiver elements arranged according to a zone to be monitored, and a command and control unit that configures the elements and collects information relating to objects detected by the receiver elements. Each transmitter element transmits a signal, the bandwidth of which is substantially equal to the totality of a frequency band B allocated to the system. Each transmitter element transmits a common waveform to all of the transmitter elements, and the waveform is modulated by a binary signal specific to the element in question, this signal allowing each of the receiver elements receiving a signal to identify the transmitter element at the source of this signal. The coding applied to the waveform is defined so that the spread spectrum caused to the signal transmitted by the latter does not exceed the frequency band B allocated to the system.

Abstract: The invention relates to the general field of the detection, notably the radar detection, of mobile or fixed targets. It consists of a method making it possible mainly to qualify the blips supplied by the processing subsystem of the detection system before the latter are analyzed to generate tracks, each track being assumed to represent the trajectory of a moving object that has been detected. According to the invention, an analysis duration is considered, and all of the blips detected during this period are considered. These blips are divided up into subsets, each subset corresponding to the blips that, during the analysis duration, have been detected in one and the same analysis channel defined by an initial position and a speed vector. The subsets formed in this way are then grouped together, one and the same group combining the subsets comprising blips for which the combined assertion of a plurality of attributes is verified.

Abstract: In the field of the radar monitoring of airspace zones, and more particularly to the low altitude air surveillance of zones that are more or less densely populated with fixed objects comprising moving parts, such as wind turbines for example, two processing modules are applied to the raw signal Sb(t) received by the radar. The first module carries out the recognition in the signal Sb(t) of a signal reflected by a wind turbine, the recognition being performed by detecting an evolution in the course of time of the amplitude of the signal received Sb(t), characteristic of this type of signal. The first module also formulates a spurious-signal model either directly on the basis of the signal Sb(t) or on the basis of external real-time information relating to the operating state of the wind turbine whose signal has been detected. The second module executes the filtering proper of the signal Sb(t), this filtering consisting in subtracting the spurious-signal model s(t) from the signal Sb(t).

Abstract: A multistatic radar surveillance system includes transmitter elements and receiver elements arranged according to a zone to be monitored, and a command and control unit that configures the elements and collects information relating to objects detected by the receiver elements. Each transmitter element transmits a signal, the bandwidth of which is substantially equal to the totality of a frequency band B allocated to the system. Each transmitter element transmits a common waveform to all of the transmitter elements, and the waveform is modulated by a binary signal specific to the element in question, this signal allowing each of the receiver elements receiving a signal to identify the transmitter element at the source of this signal. The coding applied to the waveform is defined so that the spread spectrum caused to the signal transmitted by the latter does not exceed the frequency band B allocated to the system.

Abstract: The invention relates to the general field of the detection, notably the radar detection, of mobile or fixed targets. It consists of a method making it possible mainly to qualify the blips supplied by the processing subsystem of the detection system before the latter are analysed to generate tracks, each track being assumed to represent the trajectory of a moving object that has been detected. According to the invention, an analysis duration is considered, and all of the blips detected during this period are considered. These blips are divided up into subsets, each subset corresponding to the blips that, during the analysis duration, have been detected in one and the same analysis channel defined by an initial position and a speed vector. The subsets formed in this way are then grouped together, one and the same group combining the subsets comprising blips for which the combined assertion of a plurality of attributes is verified.

Abstract: A process for modelling of ground clutter received by a radar, starting from a meshed numerical terrain model, including identifying cells from the meshed numerical terrain model which comprise elements having a height greater than a resolution of the model; determining, for relevant cells, an average height of the elements; sectioning the relevant cells into height-wise slices; and calculating power backscattered by each of the relevant cells by representing contents thereof with elementary reflectors distributed over an entire height thereof as a function of adjoining cells and a profile of terrain situated between the radar and a relevant cell.