An integrated optical fiber type pseudo-random code amplitude modulation offset correcting device

Abstract

The invention relates to an integrated optical fiber type pseudo-random code amplitude modulation offset correcting device including a pseudo-random code generator, a laser, a branching unit, an optical circulator, a collimator, a single-photon detector A, a single-photon detector B and a time arrival recorder, wherein an output terminal A of the branching unit is connected to an input terminal of the single-photon detector A. An output terminal of the single-photon detector A is connected to an input port A of the time arrival recorder. An output terminal B of the branching unit is connected to a port A of the circulator. A port B of the circulator is connected to the collimator. A port C of the circulator is connected to an input terminal of the single-photon detector B. An output terminal of the single-photon detector B is connected to an input port B of the time arrival recorder. The advantages are as follows: 1) depth migration caused by the asynchronism of pulses is avoided; 2) integration of code pattern transmitting and receiving is realized; 3) a spread spectrum point spread function is obtained in real time; and 4) the depth migration is corrected in real time.

Description

technical field [0001] The invention relates to a depth measurement correction device, in particular to an integrated optical fiber type pseudo-random code amplitude modulation offset correction device, which belongs to the technical field of laser distance measurement. Background technique [0002] In recent years, research on time-correlated photon counting pseudo-random code spread spectrum systems has been widely carried out. First, the existing pseudo-random code lidar depth acquisition systems mostly use one channel to transmit pseudo-random codes and the other channel to generate synchronous high-level signals. The problem with this existing technology is that the high-level pulse cannot be completely synchronized with the time when the code starts to be sent, especially when sending a high bit stream rate, this asynchrony will cause code reconstruction problems Offset, resulting in the broadening of cross-correlation waveforms, depth accuracy and other issues; and so...

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