CN-122024431-A - Method and system for modulating and decoding multiband infrared signal

CN122024431ACN 122024431 ACN122024431 ACN 122024431ACN-122024431-A

Abstract

The invention relates to the field of optical control, in particular to a method and a system for modulating and decoding multiband infrared signals, which are used for carrying out frequency synchronization processing on infrared signals of all groups of infrared correlation detectors through a preset communication protocol, distributing corresponding signal communication frequencies for all groups of infrared correlation detectors, generating corresponding infrared signals based on the signal communication frequencies, carrying out compound modulation on the infrared signals according to a preset compound modulation algorithm, transmitting compound modulation signals through a transmitter of the infrared correlation detectors, receiving the infrared signals through a receiver of the infrared correlation detectors, and carrying out signal decoding on the compound modulation signals through a corresponding demodulation algorithm.

Inventors

XU YOUHUA
LIU JIAN

Assignees

精华隆智慧感知科技（深圳）股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (10)

1. A method for modulating and decoding a multi-band infrared signal, comprising: Carrying out frequency synchronization processing of infrared signals on each group of infrared correlation detectors through a preset communication protocol so as to allocate corresponding signal communication frequencies for each group of infrared correlation detectors; generating a corresponding infrared signal based on the signal communication frequency, and performing composite modulation on the infrared signal to emit a composite modulation signal through a transmitter of the infrared correlation detector; and receiving the infrared signal through a receiver of the infrared correlation detector, and performing signal decoding on the composite modulation signal by a corresponding demodulation algorithm.
2. The method of modulating and decoding a multi-band infrared signal according to claim 1, wherein the step of performing the frequency synchronization processing of the infrared signal on each set of infrared correlation detectors through a preset communication protocol to assign a corresponding signal communication frequency to each set of infrared correlation detectors comprises: Generating expected signal frequency adjustment time and corresponding signal communication frequency for each group of infrared correlation detectors through a preset communication protocol; The method comprises the steps of carrying out cooperative communication of signal frequency adjustment time on each group of infrared correlation detectors so as to synchronously correct the signal frequency adjustment time of each group of infrared correlation detectors; And when the time accords with the signal frequency adjustment time, adjusting the transmitter and the receiver to the signal communication frequency through a frequency adjustment module arranged in the transmitter and the receiver.
3. The method of modulating and decoding a multi-band infrared signal according to claim 2, wherein the constructing step of the communication protocol comprises: acquiring relative setting information of each group of infrared correlation detectors to construct a digital layout model of each group of infrared correlation detectors; according to the selectable frequency channel range of each group of infrared correlation detectors, deploying a plurality of frequency modes to be selected for each group of infrared correlation detectors in the digital layout model; Performing adjacent beam interference simulation on various frequency forms to be selected of each group of infrared correlation detectors based on the digital layout model to obtain interference characteristics among the various frequency forms to be selected of each group of infrared correlation detectors; and taking interference characteristics among various frequency forms to be selected of each group of infrared correlation detectors as a value evaluation basis of cooperative work of each group of infrared correlation detectors, and constructing the communication protocol.
4. The method of modulating and decoding the multi-band infrared signal according to claim 3, wherein the communication protocol further comprises an ambient light element, the ambient light element is introduced into the communication protocol by sensing the ambient light condition to generate a corresponding ambient light element, and the communication protocol is caused to analyze interference characteristics between various alternative frequency forms of each group of infrared correlation detectors under the current ambient light condition according to the ambient light element to determine signal communication frequencies allocated to each group of infrared correlation detectors; When the communication protocol contains an ambient light element, various ambient light conditions need to be introduced when adjacent light beam interference simulation is executed in constructing the communication protocol, so that adjacent light beam interference simulation under various ambient light conditions is performed on each group of infrared correlation detectors.
5. The method of modulating and decoding a multi-band infrared signal according to claim 1, wherein the infrared signal is complex modulated by the complex modulation algorithm, and the complex modulation algorithm complex modulates the infrared signal including pulse width modulation implemented by a preset pulse width sequence and phase modulation implemented by a preset phase change law.
6. The method of claim 5, further comprising continuously sensing information about a working environment in which each group of infrared correlation detectors is located, so as to obtain an ambient light intensity feature and a temperature variation trend feature, performing time sequence arrangement and vectorization expression on the ambient light intensity feature and the temperature variation trend feature of each time node to generate an ambient sensing feature matrix, performing cluster analysis and correlation analysis based on the ambient sensing feature matrix, so as to generate an ambient influence element according to an analysis result, and substituting the ambient influence element into the complex modulation algorithm, so as to correspondingly adjust complex modulation of the infrared signals.
7. A system for modulating and decoding a multi-band infrared signal, for implementing a method for modulating and decoding a multi-band infrared signal as defined in any one of claims 1-6, the system comprising a plurality of sets of infrared correlation detectors, each set of infrared correlation detectors comprising a transmitter and a receiver.
8. The system of claim 7, wherein the light receiving end of the receiver is provided with a composite filter assembly, the composite filter assembly comprises a filter housing, a filter lens and a filter receiving tube which are sequentially overlapped, the filter housing is made of a material capable of blocking visible light and ultraviolet light and is used for filtering interference of the visible light and the ultraviolet light, the filter lens is made of a material capable of only passing high transmittance of infrared light and is used for further screening the required infrared light, and the filter receiving tube is made of a material capable of aiming at high transmittance of infrared light with a specific wavelength and high blocking light with other wavelengths and is used for further screening the required infrared light.
9. The system of claim 7, wherein the light receiving ends of the transmitter and the receiver of the transmitter are each provided with a large-sized lens made of an optical PMMA material, the diameter of the lens is 51mm, and the curvature of the lens is of an aspheric structure for reducing the beam angle to within 5 ° so as to stabilize the light receiving.
10. The system of claim 7, wherein the transmitter has an infrared transmitting tube with a chip size greater than 24 mils and a transmit power greater than 250mW, and the receiver has an infrared receiving tube with a chip size greater than 90 PD.

Description

Method and system for modulating and decoding multiband infrared signal Technical Field The invention relates to the field of optical control, in particular to a method and a system for modulating and decoding multiband infrared signals. Background The infrared correlation detector is used as core equipment for perimeter security, and the basic working principle is that intrusion detection is realized through an infrared beam barrier formed between a transmitter and a receiver. The typical structure comprises transmitters and receivers which are arranged in pairs, the transmitters continuously transmit infrared beams, the receivers monitor the on-off states of the beams in real time, and when the beams are shielded, alarm signals are triggered, so that the infrared beams are widely applied to illegal intrusion detection of scenes such as the periphery of a building, enclosing walls, doors and windows. The prior art has formed the mainstream scheme of fixed frequency, multi-beam collaborative detection. For example, a series of products which are launched by the sea Conway are designed by four light beams, a three-dimensional protective net is formed by a plurality of infrared light beams, and a series of products of the Ottas are in a composite mode of an upper detection area and a lower detection area, and only when the two areas are triggered simultaneously, an alarm is generated, so that false alarms caused by small animals or single light source interference are reduced. In order to improve the anti-interference capability, the industry generally adopts modulation technology improvement, eliminates external noise interference such as sunlight, vehicle light and the like through specific frequency pulse modulation, and utilizes a special conductive filter to block stray light and radio frequency interference so as to specially optimize the false alarm problem of scenes such as automobile headlight reflection and the like. However, the existing infrared correlation products still have a plurality of problems in practical application, which seriously affect the monitoring precision and reliability, and are specifically as follows: 1. the single filter material is adopted, so that most of other light sources cannot be blocked and isolated, and the light receiver is easily affected by external stray light to generate false alarm; 2. the lens with small size is equipped, the light condensing and receiving effects are poor, the light receiver receives unstable light, the beam angle is too large, and the light receiver is easily interfered by non-target objects; 3. the low-power infrared emission and the infrared receiving tube are used, the emission power is low, the anti-interference capability is poor in severe environments such as fog, rain, sand dust and the like, and the signal transmission is easy to break; 4. The fixed frequency is adopted, so that the conditions of multi-beam adjacent interference and ambient light co-frequency interference cannot be processed, and the working stability of equipment is reduced; 5. By using a single modulation mode, the modulated waveform and the ambient light waveform have the risk of overlapping, and the possibility of false alarm is further increased. Disclosure of Invention The invention aims to provide a method and a system for modulating and decoding multi-band infrared signals, which can solve the problems in the prior art. The invention provides a method for modulating and decoding multi-band infrared signals, which comprises the following steps: Carrying out frequency synchronization processing of infrared signals on each group of infrared correlation detectors through a preset communication protocol so as to allocate corresponding signal communication frequencies for each group of infrared correlation detectors; generating a corresponding infrared signal based on the signal communication frequency, and performing composite modulation on the infrared signal to emit a composite modulation signal through a transmitter of the infrared correlation detector; and receiving the infrared signal through a receiver of the infrared correlation detector, and performing signal decoding on the composite modulation signal by a corresponding demodulation algorithm. The invention provides a system for modulating and decoding a multiband infrared signal, which is used for realizing the method for modulating and decoding the multiband infrared signal according to any one of the first aspect, wherein the system is composed of a plurality of groups of infrared correlation detectors, and each group of infrared correlation detectors comprises a transmitter and a receiver. In summary, the beneficial effects of the invention are as follows: 1. The composite filter component remarkably improves the blocking capability of interference to other light sources and reduces false alarm of a light receiver through a plurality of layers of filters with different functions. 2. The large-size opt