A background suppression sensor (1) comprising: - an electromagnetic radiation transmitter (4) adapted to emit a pulse train (T1) of electromagnetic radiation towards an object (O) which reflects the emitted pulse train, thereby producing a reflected pulse train electromagnetic radiation (T2) is generated; A receiver of electromagnetic radiation (6) comprising a matrix (13) of pixels (14) sensitive to the electromagnetic radiation, the matrix having maximum dimensions of 10x10 pixels, the receiver (6) being fitted to receive the reflected pulse train of electromagnetic radiation (T2), and wherein each pixel of the array is adapted to output an output signal determined by the detected reflected pulse train; A first processor circuit (8) adapted to process the output signals originating from the pixels of the matrix (13) so as to calculate an average distance (dbcalculated) to the object (O) which is at the average of based on the pixels (14), wherein the average distance is calculated based on measurements of the transit time (TOF) between the emitted pulse train (T1) and the detected reflected pulse train (T2), the first processor circuit (8) at the output outputs an average distance signal that is proportional to the average distance (dberechnet); A second processor circuit (9) adapted to compare the averaged distance signal (dbc), or a function thereof, to a first threshold distance value (dthreshold1, tthreshold2) and to output a signal depending on the result of the comparison indicates the presence / absence of the object (O) within or outside a space of the same extent as the first threshold distance.
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