Dual-wavelength dual-pulse unambiguous laser ranging device

Abstract

The invention discloses a dual-wavelength dipulse non-fuzzy laser ranging device. According to the basic principle, two laser pulses with two wavelengths are emitted, time intervals of the two laser pulses are sequentially encoded, a receiving channel receives laser back waves with two wavelengths with a wavelength beam splitting method and transmits the laser back waves to two detectors respectively, and time measurement is conducted on the laser back waves; back wave time difference between the pulses with the two wavelengths is calculated, the time difference of the starting pulse corresponding to the current laser back wave is accurately decoded, and the distance of a target is calculated. The dual-wavelength dipulse non-fuzzy laser ranging device has the advantages that the two pulses with the two wavelengths and encoded time intervals are adopted for ranging, and remote high-repetition-frequency non-fuzzy laser ranging can be achieved.

Description

technical field

[0001] The invention relates to a laser radar and a laser three-dimensional scanner, in particular to a dual-wavelength and double-pulse non-ambiguous laser ranging device, which can realize high repetition frequency, long-distance, and non-ambiguous laser ranging. Background technique

[0002] In the field of laser radar and laser 3D scanner, the commonly used laser ranging methods mainly include time-of-flight pulse direct ranging method and phase measurement method. Phase measurements are often used for close-range measurements because the emitted laser power is low. For non-cooperative targets beyond 200 meters, the pulse time-of-flight ranging method is usually used. The distance ambiguity problem exists in the pulse time-of-flight method. In order to obtain accurate distance information, the product of the ranging distance and the laser repetition frequency must be less than half of the speed of light. For LiDAR for long-distance measurement, it is of...

Examples

Embodiment

[0032] The two different wavelength laser sources 3 are composed of a short-wavelength 1530nm fiber laser 3-1 and a short-wavelength 1560nm fiber laser 3-2, which can receive pulse trigger electrical signals and generate corresponding pulse laser output.

[0033] The wavelength beam combiner 4 is a wavelength cut-off plate for long-wave reflection and short-wave transmission, with a cut-off wavelength of 1545 nm, which combines two laser beams with different wavelengths and different optical paths into the same optical path.

[0034] The receiving telescope 5 is a transmissive focusing lens, which converges the laser echo to the detector.

[0035] The wavelength beam splitter 6 is a wavelength cut-off plate with long-wave reflection and short-wave transmission, and the cut-off wavelength is 1545nm, which divides the two wavelength lasers in the same laser echo into two optical paths.

[0036] Described bandpass filter 7 is made up of the bandpass filter 7-2 that two passband c...

technical field

[0001] The invention relates to a laser radar and a laser three-dimensional scanner, in particular to a dual-wavelength and double-pulse non-ambiguous laser ranging device, which can realize high repetition frequency, long-distance, and non-ambiguous laser ranging. Background technique

[0002] In the field of laser radar and laser 3D scanner, the commonly used laser ranging methods mainly include time-of-flight pulse direct ranging method and phase measurement method. Phase measurements are often used for close-range measurements because the emitted laser power is low. For non-cooperative targets beyond 200 meters, the pulse time-of-flight ranging method is usually used. The distance ambiguity problem exists in the pulse time-of-flight method. In order to obtain accurate distance information, the product of the ranging distance and the laser repetition frequency must be less than half of the speed of light. For LiDAR for long-distance measurement, it is of...

Examples

Embodiment

[0032] The two different wavelength laser sources 3 are composed of a short-wavelength 1530nm fiber laser 3-1 and a short-wavelength 1560nm fiber laser 3-2, which can receive pulse trigger electrical signals and generate corresponding pulse laser output.

[0033] The wavelength beam combiner 4 is a wavelength cut-off plate for long-wave reflection and short-wave transmission, with a cut-off wavelength of 1545 nm, which combines two laser beams with different wavelengths and different optical paths into the same optical path.

[0034] The receiving telescope 5 is a transmissive focusing lens, which converges the laser echo to the detector.

[0035] The wavelength beam splitter 6 is a wavelength cut-off plate with long-wave reflection and short-wave transmission, and the cut-off wavelength is 1545nm, which divides the two wavelength lasers in the same laser echo into two optical paths.

[0036] Described bandpass filter 7 is made up of the bandpass filter 7-2 that two passband c...

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