A large field of view laser warning method and system

Abstract

The invention discloses a laser alarming method and system for a large field of view. The laser alarming method comprises the detailed steps that an optical signal from the large field of view is received and converted into an electrical signal; the electrical signal is converted into a first pulse signal, and a second pulse signal is obtained by preprocessing P data from every P cycle of the first pulse signal, that is, after maximum M data and minimum N data in the P data are removed and then an average value is extracted to obtain a dynamic threshold D1; a first average value D2 is obtainedthrough extraction of maximum Q data and the average value; when the first average value D2 is less than the dynamic threshold D1 of S times of a first reference value, the fact that a laser signal is not included in the P data is confirmed, and the second pulse signal is not transmitted; a value, below the dynamic threshold D1, in the P data of the first pulse signal is set to be zero to obtaina second pulse signal; and the second pulse signal with the pulse width exceeding a first preset threshold T1 is decoded and output, and thus a false alarming rate of the laser alarming method for thelarge field of view is lowered.

Description

technical field [0001] The invention belongs to the field of lasers, and in particular relates to a large field of view laser warning method and system. Background technique [0002] The core of a laser-guided weapon is a laser semi-active guidance system, which consists of a laser seeker on the bomb and a laser target indicator outside the bomb. The laser target indicator emits a laser coded signal to the target and relies on the diffuse reflection signal of the target to guide the guidance. The weapon attacks the target. In order to ensure that the guided weapon can correctly identify the target indicated by its own side in a complex battlefield environment, the guidance signal emitted by the indicator is coded according to the preset code of the system. [0003] As an important part of the field of photoelectric countermeasures, the laser warning device directly affects the battlefield survival of the protected target. When the laser-guided weapon strikes an important tar...

AI Technical Summary

Problems solved by technology

[0004] The traditional scattering and interception laser warning device adopts the method of improving the sensitivity of the photoelectric conversion module. The photoelectric conversion module adopts the method of signal amplification and comparator threshold value judgment. The comparator threshold value is greater than the voltage value of the noise signal. The noise is mainly composed of two parts: one is Circuit noise, the second is background light noise, circuit noise includes photodetector noise, dark current noise, etc., the circuit noise can be reduced as much as possible by optimizing devices and optimizing circuit layout; but the background light noise is the noise of solar radiation, the more sunlight Stronger, the closer the incident angle is to 90°, the greater the optical noise. Therefore, when the laser warning field of view is larger, the optical noise is also stronger, and the false alarm rate is also increased. Sensitivity improvement is limited

At the same time, there are two main ways to improve the sensitivity of traditional photoelectric conversion modules: 1. Use laser detectors with better performance. If imported devices are used, the cost will be higher; The laser signal output by the device is amplified multiple times (generally three levels), so that the signal amplitude exceeds the threshold circuit, and then transmitted to the signal processing circuit; therefore, the noise signal is also amplified while the laser signal is amplified, causing the threshold circuit to set the amplitude If it is too high, it will not improve the sensitivity

At the same time, since the field of view of the collected laser light becomes larger and has a converging effect, it is equivalent to increasing the energy of the incident laser light, but at the same time the background interference (sunlight interference) is also enhanced. Since the inherent electrical noise of the circuit has not changed, therefore, at night and at noon When under strong sunlight, the range of sunlight interference noise becomes wider, and the method of using a fixed threshold is no longer applicable

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