Photon counting apparatus-based optimal code quick generation and decoding method

Abstract

The invention discloses a photon counting apparatus-based optimal code quick generation and decoding method. The method comprises the steps of generating a random number through a linear congruence algorithm, and judging a modulation position; repeating the step till a set code length is obtained, and obtaining a complete multi-phase pseudorandom code; repeating the steps for multiple times to obtain an initial population of a particle swarm; calculating the fitness of each particle; evolving each particle and recording the particle with the highest fitness; and repeating the evolution step till a preset maximum evolution algebra or a stop criterion is met, and obtaining a transmitting code. A receiving code is obtained through a receiving system and then the transmitting code is related to the receiving code, thereby calculating out a target distance. The multi-phase pseudorandom code meeting the requirements of a photon counting apparatus is conveniently generated and the code performance is ensured to be excellent; the generation speed is much higher than that of a method for searching for an optimal code by directly using a heuristic algorithm; and the method has the advantagesof integer coding of a particle swarm algorithm, difficulty in generating an illegal solution and the like.

Description

technical field [0001] The invention belongs to the technical field of laser radar, in particular relates to the field of extremely weak light detection, and specifically relates to a method for quickly generating an optimal pseudo-random coding sequence suitable for extremely weak light detection and a method for quickly generating a pseudo-random coding sequence in extremely weak light detection. application in distance. Background technique [0002] Photon counting detection is a brand-new lidar detection method, which can improve the detection sensitivity to the quantum limit, and even the average single pulse echo energy is much smaller than a photon; it can achieve low power consumption and high-precision target three-dimensional information acquisition. Compared with traditional analog counting technology, photon counting technology has higher sensitivity, better stability and higher time resolution. [0003] In order to quickly obtain target information, photon coun...

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Problems solved by technology

[0010] The invention discloses a fast generation and decoding method of an optimal code based on a photon counting device to solve the problem that the traditional pseudo-random sequence is difficult to generate a sequence of a specific length, the code form is fixed, the frequency spectrum is not wide enough, the anti-interference ability is not strong, and it is not fully considered. The application environment of photon counting devices and other problems, at the same time, this method can also ensure that the obtained coding sequence has excellent performance

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