Pseudo-random code modulation based intermediate and long-range high-frequency laser radar ranging blurring solution method

Abstract

The invention provides a pseudo-random code modulation based intermediate and long-range high-frequency laser radar ranging blurring solution method. The method comprises the steps of calculating a potential measurement distance section of a detection target and each section distribution probability preliminarily by using a BP neutral network and regarding the potential measurement distance section and each section distribution probability as initial calculation input; further calculating a measurement interval of echoes by using complexity and internal incidence relation of echo signals and continuity characteristics of ground features in the full waveform signals; modulating laser pulse transmission time by using a pseudo-random binary sequence, calculating an accurate echo detection section based on a criterion of noise energy minimization of echoes reflected by the sequential targets, determining a corresponding relationship between the echoes and seeds light, and accordingly calculating an accurate measuring distance. The pseudo-random code modulation based intermediate and long-range high-frequency laser radar ranging blurring solution method can solve the ranging blurring problem in a high-frequency laser radar efficiently and accurately, and can obtain relatively high measuring precision and accuracy at a remotely far measuring distance and a relatively dense measuringpoint in the high-frequency laser radar surveying.

Description

technical field [0001] The invention relates to the field of laser radar measurement, in particular to a fuzzy solution method for mid-range and high-frequency laser radar ranging based on pseudo-random code modulation. technical background [0002] Accuracy, density and efficiency are three important indicators to measure the capability of airborne lidar. With the application of full-waveform lidar technology, people put forward higher requirements for the measurement distance and laser footpoint density of airborne lidar. However, when a laser transmitter with a high repetition rate is applied to an airborne lidar, it inevitably brings about the problem of ambiguity in the relationship between the laser emission pulse and the echo signal, that is, in a high-frequency lidar, when the echo When the time interval between the receiving moment and the seed light emission time is more than one or even multiple pulse emission time intervals, it is impossible to directly determin...

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Problems solved by technology

However, when a laser transmitter with a high repetition rate is applied to an airborne lidar, it inevitably brings about the problem of ambiguity in the relationship between the laser emission pulse and the echo signal, that is, in a high-frequency lidar, when the echo When the time interval between the receiving moment and the seed light emission time is more than one or even multiple pulse emission time intervals, it is impossible to directly determine the correct correspondence between the echo signal and its seed light signal from the time signal sequence, resulting in the problem of ranging ambiguity

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