Multi-pulse delay integral shaping method capable of achieving range gating space energy envelope

Abstract

The invention discloses a multi-pulse delay integral shaping method capable of achieving range gating space energy envelope. In one frame of exposure time of a gating image device, laser pulses and gating pulses form M pulse pairs, gating delay coded modulation is carried out on the M pulse pairs according to target range gating space energy envelope geometric features so that subspace sampling areas at different distances can be sampled, intra-frame delay integral of M subgraphs is achieved in one frame of the exposure time of the gating image device, and ultimately one frame of a range gating slide image having the target range gating space energy envelope geometric features can be output. The method is good in adaptability and high on flexibility; the problem that it is difficult for a laser device with a pulse width non-adjustable to achieve energy envelope of range gating spaces of different shapes can be solved; the problem that due to the fact that rectangular square wave laser pulses are difficult to obtain, the range gating space energy envelope is hard to achieve can be solved; the selection range of pulse lasers used for three-dimensional imaging through range gating super-resolution is greatly widened.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional imaging, and in particular relates to a multi-pulse time-delay integral shaping method of a range-gated space energy envelope. Background technique [0002] Range-gated super-resolution 3D imaging is a new staring 3D imaging technology. It has the characteristics of long working distance, high pixel count (up to 1000×1000 pixels), large depth of field and high range resolution. It has broad application prospects in target detection in complex environments, hidden / occluded target detection, terrain mapping, obstacle avoidance navigation, intelligent monitoring and other fields. [0003] The range-gated super-resolution 3D imaging technology was proposed by Martin Laurenzis et al. in 2007 (Martin Laurenzis, Frank Christnach x r, and David Monnin, Long-range three-dimensional active imaging with superresolution depth mapping, Opt.Lett., 2007, Vol.32(21), 3146-3148), this technology control...

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Problems solved by technology

At present, the gate width of the gate imaging devices used for range gate three-dimensional imaging can be adjusted, but the pulse width of pulsed lasers is mostly not adjustable or can only be fine-tuned, such as 532nm solid-state lasers, which can only be adjusted by adjusting the gate width. To match the laser pulse width to achieve 3D imaging with a specific depth of field, which greatly limits the flexibility of imaging depth of field. In other words, the depth of field of the distance-gated spatial energy envelope cannot be flexibly adjusted

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