A lidar system comprising a laser assembly comprising at least one laser source (2, 3, 21), and an optical detecting system for detecting radiation emitted by the laser assembly and reflected by a scene to be observed, said system being configured such that: - the laser assembly is configured to emit a first beam having a first comb of separate wavelengths λ i, i∈[1;m] and a second beam having a second comb of separate wavelengths λ j, jE[n;p] different from those of the first comb; - the lidar system also comprises a first diffractive optical component configured to direct the first beam toward the scene to be observed in a plurality of different directions θ i ∈[1;n] for each wavelength λ i of the first comb, said directions being located in one and the same xz plane, called an azimuthal plane, the laser radiation obtained after diffraction of the first beam by the first diffractive optical component being called the first diffracted radiation; - said lidar system further comprises a second diffractive optical component configured to direct the second beam toward the scene to be observed in a plurality of different directions φ j ∈[n;p] for each wavelength λ j of the second comb, said directions being located in one and the same yz plane, called an elevation plane, which is not parallel to the azimuthal xz plane, the laser radiation obtained after diffraction of the second beam by the second diffractive optical component being called the second diffracted laser radiation; - the optical detecting system comprises at least one photodiode arranged so as to detect a portion of the first diffracted radiation reflected by the scene to be observed, called the first reflected portion, and a portion of the second diffracted radiation reflected by the scene to be observed, called the second reflected portion, the photodiode being configured to generate a signal comprising the beats of each wavelength λ i of the first reflected portion with each wavelength λ j of the second reflected portion; and - the lidar system further comprises a processing unit for processing the signal generated by the photodiode, which is configured to determine the position and/or the radial speed of objects present in the scene to be observed, on the basis, at least, of one or more frequencies of said beats comprised in said signal. - the laser assembly is configured to emit a first beam having a first comb of separate wavelengths λ i, i∈[1;m] and a second beam having a second comb of separate wavelengths λ j, jE[n;p] different from those of the first comb; - the lidar system also comprises a first diffractive optical component configured to direct the first beam toward the scene to be observed in a plurality of different directions θ i ∈[1;n] for each wavelength λ i of the first comb, said directions being located in one and the same xz plane, called an azimuthal plane, the laser radiation obtained after diffraction of the first beam by the first diffractive optical component being called the first diffracted radiation; - said lidar system further comprises a second diffractive optical component configured to direct the second beam toward the scene to be observed in a plurality of different directions φ j ∈[n;p] for each wavelength λ j of the second comb, said directions being located in one and the same yz plane, called an elevation plane, which is not parallel to the azimuthal xz plane, the laser radiation obtained after diffraction of the second beam by the second diffractive optical component being called the second diffracted laser radiation; - the optical detecting system comprises at least one photodiode arranged so as to detect a portion of the first diffracted radiation reflected by the scene to be observed, called the first reflected portion, and a portion of the second diffracted radiation reflected by the scene to be observed, called the second reflected portion, the photodiode being configured to generate a signal comprising the beats of each wavelength λ i of the first reflected portion with each wavelength λ j of the second reflected portion; and - the lidar system further comprises a processing unit for processing the signal generated by the photodiode, which is configured to determine the position and/or the radial speed of objects present in the scene to be observed, on the basis, at least, of one or more frequencies of said beats comprised in said signal.