Phase-type laser radar ranging device based on pulse position modulation

Abstract

The invention discloses a phase-type laser radar ranging device based on pulse position modulation, and the device comprises a control module which is used for generating a sinusoidal continuous signal as a modulation signal, generating a modulation pulse sequence composed of continuous modulation pulses according to the modulation signal; a laser used for generating a laser pulse optical signal according to the modulation pulse sequence; a coupler, used for dividing the laser pulse optical signal into a detection optical signal and a reference optical signal; a transmitting optical system, used for transmitting a detection optical signal; a receiving optical system, used for receiving echo optical signals; a first photoelectric detector, used for detecting a reference light signal; a second photoelectric detector, used for detecting an echo light signal; a first pulse recording module, used for recording each pulse moment of the reference optical signal; a second pulse recording module, used for recording each pulse moment of the echo optical signal; and a signal processing module, used for calculating the distance value of the measured target. According to the invention, high measurement precision and large measurement range can be obtained, the measurement time is shortened, and the complexity is reduced.

Description

technical field [0001] The invention relates to the technical field of radar distance measurement, in particular to a pulse position modulation-based phase laser radar distance measurement device. Background technique [0002] Laser ranging is the earliest applied and most mature technology in laser radar. With the development of laser technology and electronic technology, it is currently developing in the direction of high precision and large range. It is bound to be more widely used in many fields in the future. Applications. Depending on the state of the emitted light, laser ranging technology is usually divided into pulsed laser ranging and continuous wave laser ranging. Pulse laser ranging measures the distance by directly measuring the round-trip flight time of the laser pulse, while continuous wave laser ranging emits a continuous wave signal, and determines the distance by detecting the phase delay between the echo signal and the transmitted signal. Comparing the t...

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Problems solved by technology

[0004] However, the above improved pulse laser ranging method increases the detection time and is suitable for the measurement of short-distance static targets, while the time discrimination technology and time interval measurement technology need to be further researched and developed; the improvement of phase laser ranging, in addition to the need To identify the pulse time, the signal processing part also needs an additional frequency mixing circuit and digital phase detection circuit, and the implementation method is relatively complicated

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