CN104683036B - A kind of many source laser binary phase modulation and demodulation device and methods - Google Patents

Abstract

The invention discloses a multi-source laser binary phase modulation and demodulation device and method, wherein the device includes a binary phase modulation transmitting device and a binary phase demodulation receiving device, and the binary phase modulation transmitting device includes two The above laser light source and the information modulation main controller connected with the laser light source to control the laser light source for each instant light combination, the binary phase demodulation receiving device includes a laser sensitive unit and connected with the laser sensitive unit for identifying the laser sensitive The information received by the unit from the combination of laser light and light is demodulated by the main controller. In the present invention, the signal representation unit compares the collected information flow with the data set, and provides the combination of the correspondingly modulated light source for transient information representation. At the same time, the receiving unit passes the preset information through the receiving and judging steps through the laser information sending unit. It is transmitted to the subsequent signal processing unit, so as to realize the multi-source binary phase modulation and demodulation of the signal.

Description

A multi-source laser binary phase modulation and demodulation device and method

technical field

The invention relates to the technical field of laser transmission binary phase modulation and demodulation devices, in particular to an efficient extended binary phase modulation and demodulation device and method.

Background technique

The mode of signal modulation and demodulation is related to the efficiency of information transmission in the medium. The current research mainly focuses on ultra-wideband and MIMO (multiple transmission and multiple reception systems). The main means is to achieve efficient signal transmission through radio or laser. To transmit information quickly and effectively, reduce the resources used for information transmission, and make full use of limited bandwidth resources. However, the research and development of efficient modulation methods and devices for short-distance laser information transmission is still a blank, special test environment and equipment Detection and information exchange in the operating environment are necessary links for safe production and rescue. Reducing the impact of any transmission process on other transmission processes has important economic and technical effects.

With the development and application of sensor technology, from the initial single-channel sensor to modern multi-channel optical, electrical, acoustic and other sensors, the corresponding amount of information transmission has also increased accordingly. However, any high-efficiency information modulation and demodulation technology has its accuracy and measurement limitations, and the signal is subject to environmental interference. For many different signal generators and sensors from the same scene, due to the type and measurement principle of the signal generator and sensor Similarly, even if there is interference, the degree of difference in the information obtained is relatively large.

Contents of the invention

The primary purpose of the present invention is to provide a multi-source laser binary phase modulation and demodulation device and method including multiple laser light sources, multiple photosensitive receiving units.

To achieve the above object, the present invention adopts the following technical solutions:

A multi-source laser binary phase modulation and demodulation device, including a binary phase modulation transmitter and a binary phase demodulation receiver, characterized in that: the binary phase modulation transmitter includes more than two A laser light source and an information modulation main controller connected to the laser light source for controlling each momentary combination of light from the laser light source, the binary phase demodulation receiving device includes more than two groups for receiving the light from the laser light source A combined laser sensitive unit and an information demodulation master controller connected to the laser sensitive unit for identifying the combination of light emitted by the laser light source received by the laser sensitive unit.

The laser sensitive unit is located on the receiving surface of a receiving unit body, a narrow-band filter is arranged in front of the laser sensitive unit, and the information demodulation main controller includes a unit controller and a signal discrimination detector, and the laser sensitive unit The output end of the unit is connected with the input end of the signal discrimination detector through the unit controller.

The laser generating source unit adopts LD laser light source.

The laser sensitive unit is a photodiode.

A multi-source laser binary phase modulation and demodulation method is characterized in that: it includes a phase modulation step and a phase demodulation step, and in the phase modulation step, the main controller of the signal modulation compares the collected information flow with the data set to give The corresponding modulated laser light source luminescence combination is displayed to represent the transient information; the phase demodulation step judges the laser light source luminescence combination received by the laser sensitive unit through the information demodulation master controller to realize signal demodulation.

The specific method of the signal demodulation step is:

1), the main controller of signal modulation calculates the emission configuration scheme of the instantaneous multi-source laser light source according to the information flow and EBPSK modulation mode;

2) The main controller of signal modulation transmits signals to the multi-source laser emitting group according to the configuration plan, specifically for each laser light source, judges whether the light source is emitted at this moment according to the configuration plan, and if the judgment result is yes, then starts the laser light source ; otherwise do nothing.

The specific method of the phase demodulation step is as follows: the laser sensitive unit judges whether the corresponding wavelength in the emitting device has emitted laser light instantaneously, if the judgment result is yes, then the output voltage of the signal discrimination detector changes, if the judgment result is no, Then keep the output voltage of the discriminant detector unchanged; the main controller of information demodulation makes instantaneous optical judgment according to the variation of the output voltage of the discriminant detector, and converts the instantaneous optical judgment result into information combination.

Compared with the prior art, the present invention adopts the modulation master controller to arrange and combine N laser light sources. If N light sources are used, each laser light source has two states of emitting and not emitting, and there are 2 ^N configuration modes in total. , indicating the information represented by a modulated pulse. EBPSK modulation has the characteristics of ultra-narrow band, and the multi-source method can increase the amount of information transmitted under the condition that the maximum modulation rate of the small laser light source remains unchanged.

The invention adopts the modulation and demodulation design, and has the advantages of light weight, high information transmission efficiency, small volume and portability.

Description of drawings

Fig. 1 is a schematic diagram of the device of the present invention;

Fig. 2 is a schematic diagram of the device of the present invention;

Fig. 3 is a schematic diagram of multi-source laser light source information modulation;

Fig. 4 is a schematic diagram corresponding to multi-source laser light source information;

Fig. 5 is a schematic diagram of the operation flow of the present invention.

detailed description

A multi-source laser binary phase modulation and demodulation device and method, including a phase modulation transmitting device 1 and a phase demodulation receiving device 2, see FIG. 1 . The modulation emission device includes a plurality of laser sources with different wavelengths. These emission sources are arranged at intervals at multiple uniformly distributed positions of the emission device. The input is a signal flow, which is connected to the laser generation source through a signal representation unit. The wavelength includes 532nm, 650nm, 1064nm, 780nm, etc.

The receiving unit body is located on the receiving surface to install multiple laser sensitive units. Each laser sensitive unit has a narrow-band filter in front of it. The output end of the laser sensitive unit is connected to the input end of the signal discrimination detector through the unit controller. The signal discrimination detector The output terminal is connected with the signal processing terminal through the interface.

The laser source unit adopts LD laser light source. The laser sensitive unit uses a photodiode.

In the multi-source laser binary phase modulation method, in the present invention, the signal representation unit compares the collected information flow with the data set, and provides the combination of correspondingly modulated light sources for transient information representation. At the same time, the receiving unit transmits the laser information in advance The set information is transmitted to the subsequent signal processing unit through the steps of receiving and judging, so as to realize the multi-source binary phase modulation and demodulation of the signal.

The multi-source lasers are independent of each other and all work in EBPSK modulation mode.

The extended binary phase shift keying (EBPSK: Extended Binary Phase Shift Keying) modulation of each light source is defined as follows:

g ₀ (t)＝Asin2πf _c t, 0≤t＜T

Among them, g ₀ (t) and g ₁ (t) represent the modulation waveforms of symbols "0" and "1"respectively; the symbol period T=N/f _c lasts for N≥1 carrier period, and the "1" code The modulation time length of the element τ=K/f _c lasts for K<N carrier cycles; the carrier modulation varies with the modulation time width, τ:T=K:N can be called "modulation duty cycle". Except for the short-term inversion and amplitude A+B jump at the beginning of the data "1", the EBPSK modulation signal is a continuous sine wave, which helps to concentrate its energy at the carrier frequency.

Modulate the main controller to arrange and combine multiple laser light sources, if 10

The light source is:

Among them, 10 means 10 laser light sources, 2 means that each laser light source has two states of emitting and not emitting, 1024 means that there are 1024 configuration modes, and means the information represented by a modulation pulse. The combination is shown in Figure 3, and the light sources represented by A, B, C, D, E, F, G, H, I, J are shown in Figure 4.

As shown in Figure 5, the multi-source laser binary phase modulation and demodulation device and method, the system includes the following sequential steps:

The first step is power-on initialization;

In the second step, the main controller calculates the instantaneous multi-source laser emission configuration scheme according to the information flow and EBPSK modulation mode.

The third step is that the main controller transmits signals to the multi-source laser emitting group according to the configuration plan, specifically for each laser light source, and judges whether the light source is emitted at this moment according to the configuration plan, and if the judgment result is yes, then start the laser light source; otherwise do nothing;

The fourth step is in the demodulation receiving device, the photosensitive diode behind the filter judges whether the corresponding wavelength in the transmitting device has emitted laser light at this moment, if the judgment result is yes, the corresponding current and voltage will change, and the demodulation master controller receives After the sensitive judgment of each wavelength signal, carry out information judgment. If the judgment result of the photosensitive diode behind the filter is negative, the original current and voltage will remain unchanged, and the demodulation master controller will also obtain the judgment of the laser light source by the photosensitive diode of each wavelength.

In short, the present invention arranges and combines multiple laser light sources with different wavelengths to emit light under the instruction of the modulation main control unit, and then demodulates the information carried by the light sensor. The combination of light sources represents the relationship, and the demodulation algorithm will be given to make judgment decisions in the demodulation main control unit. The invention adopts simple design, small volume and easy to carry.

Claims (6)

1. a kind of phase-modulation and demodulation method based on many source laser binary phase modulation and demodulation devices, wherein many source lasers Binary phase modulation and demodulation device includes binary phase modulate emission device and binary phase demodulation reception device, the binary Phase-modulation emitter includes more than two LASER Light Sources of different wave length and is connected to control with the LASER Light Source Modulates information master controller of the LASER Light Source per luminescent composition in a flash is made, the binary phase demodulation reception device includes The more than two laser-sensitive unit for being used to receive the LASER Light Source luminescent composition and connect with the laser-sensitive unit Connect for recognizing that the information for the LASER Light Source luminescent composition that the laser-sensitive unit is received demodulates master controller, its feature exists In：Including phase-modulating step and phase demodulating step, the phase-modulating step is by signal modulation master controller by collection Information flow is contrasted with data set, provides the LASER Light Source luminescent composition of corresponding modulating, carries out transient state information expression；The phase solution Pacing is rapid to demodulate the LASER Light Source luminescent composition progress judgement realization letter that master controller is received to laser-sensitive unit by information Number demodulation.

2. according to the method described in claim 1, it is characterised in that：The signal demodulation step specific method is：

1）, signal modulation master controller the hair for obtaining moment multi-source LASER Light Source is calculated according to information flow and EBPSK modulation systems Penetrate allocation plan；

2）, signal modulation master controller according to allocation plan to multi-source Laser emission group carry out signal transmission, specific to it is each swash Radiant, judges whether enter line light source transmitting in this moment according to allocation plan, if the determination result is YES, then starts laser light Source；Otherwise any operation is not done.

3. according to the method described in claim 1, it is characterised in that：The phase demodulating step specific method is：Laser-sensitive Whether corresponding wavelength is in this instantaneous transmission laser in unit judges emitter, and if the determination result is YES, then signal differentiates The output voltage of detector changes, if judged result is no, maintains to differentiate that the output voltage of detector is constant；Information solution Adjust master controller to carry out transient optical judgement according to the situation of change for differentiating detector output voltage, and transient optical is judged into knot Fruit is converted into information combination.

4. according to the method described in claim 1, it is characterised in that：The laser-sensitive unit is located at a receiving unit body On receiving surface, narrow band filter slice is provided with front of the laser-sensitive unit, described information demodulation master controller includes unit control Device and signal processed differentiate detector, and the output end of the laser-sensitive unit differentiates detector by cell controller and signal Input is connected.

5. according to the method described in claim 1, it is characterised in that：The LASER Light Source uses LD LASER Light Sources.

6. according to the method described in claim 1, it is characterised in that：The laser-sensitive unit is photodiode.