CN112985508A

CN112985508A - Coding and communication method for multifunctional sensor output

Info

Publication number: CN112985508A
Application number: CN202110279169.5A
Authority: CN
Inventors: 陈俊宇; 张斐; 赵双; 杨海峰; 陈永; 方永红
Original assignee: Sichuan Communication Scientific Research Planning And Design Co ltd
Current assignee: Sichuan Communication Scientific Research Planning And Design Co ltd
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2021-06-18

Abstract

The invention relates to the technical field of signal processing, and provides a coding and communication method for multifunctional sensor output. The sensor can output more information, so that high-level data analysis is facilitated, and meanwhile, a single data line is used for transmission, so that the material cost is saved. The main scheme comprises the following steps: acquiring output signals of each sensor, and counting the output signals of each sensor to obtain the signal triggering times n of each sensor in a unit time period t; step 2: defining event types according to the signal triggering times n of each sensor in the unit time period t to obtain different event types; and step 3: and generating signal pulses with different pulse widths corresponding to the event types according to the event types.

Description

Coding and communication method for multifunctional sensor output

Technical Field

The invention relates to the technical field of signal processing, and provides a coding and communication method for multifunctional sensor output.

Background

The traditional security system mainly comprises various types of sensors and cameras with various working principles, and the basic working mode is that various sensors are used as trigger sources, only two state signals of 'presence' and 'absence' or alarms are generated, and then verification and confirmation are carried out through the cameras in a mechanical or manual mode. With the rise of artificial intelligence in recent years, the dependence of security systems on camera video information is gradually increased, and related technologies and products are continuously updated. Although the technology and equipment of the sensor are continuously improved, the more progress is to improve the perception precision and reduce the cost of the single sensing technology, the position of the sensor is still used as a trigger of the system, and the information generated by the sensor is not further mined and processed.

If data information generated by various sensors is mined and processed, on one hand, the information types output by the sensor information need to be increased to express more information content, and on the other hand, the cost in the actual use process needs to be considered, and the cost, namely the manufacturing cost of equipment and the construction use cost, cannot be obviously increased.

The existing sensor, no matter the working mode or the working principle, has two main modes for information output: a switched level output and a standard protocol interface output.

And (3) switching type level output: that is, whether information is output or not is indicated by the high and low of the level, for example, if the sensor is triggered, the output is expressed by the high level, for example, an electric signal of 3.3V is continuously output; if the sensor is not triggered, it is expressed as a low level, for example, an electric signal of 0V is continuously output. The output mode is simple in principle and low in implementation cost, and the common sound control lamp is implemented based on the sensor output. However, the disadvantage of the output mode is obvious, 1. the information is simple to express, only two states of '0' and '1', only 'none' and 'present' can be expressed, and more information cannot be expressed. In fact, the sensing device of the sensor can provide the strength information of the signal, such as the size of sound, the distance between objects, the moving speed, the vibration strength and the like. But these messages cannot be expressed in the binary state of only "0" and "1" so that much of the message is discarded.

And (3) outputting a standard protocol interface: various programmable microprocessors have rich interface output protocols, such as RS232 RS485 IIC, SPI and the like. The disadvantage that the switch type level output can not express a plurality of information can be solved. The problem of information transmission can be effectively solved. The disadvantage is that one interface can only connect one device, and the connection distance cannot be too long. However, in engineering use, the number of sensors is large, and if one interface is connected with only one device, the cost of the device is increased; in addition, the sensor equipment cannot be networked in a chain type cascade mode. The chain type cascade networking can save wires used for transmission. Therefore, although the standard protocol interface can solve the problem of small information expression quantity of the switch type level output mode, the cost is high, and the problem of engineering realization cannot be solved.

For example, patent 2017111435462 discloses an information fusion-based anti-theft system for motor vehicles, which discloses a microwave doppler sensor array, a vibration sensor array, etc., which only transmits the collected information of a single sensor to the post-processing stage, and does not perform fusion processing on the information collected by each sensor before processing, and requires multiple signal lines to process the collected information for the subsequent units.

Disclosure of Invention

The technical method mainly solves the problem of providing an output coding mode and a data transmission mechanism of the multifunctional sensor. The sensor can output more information, data analysis of a high layer is facilitated, meanwhile, transmission of a single data line is achieved, and material cost is saved.

In order to solve the technical problems, the invention adopts the following technical scheme.

A method of encoding and communicating a multifunction sensor output, comprising the steps of:

step 1: acquiring output signals of each sensor, and counting the output signals of each sensor to obtain the signal triggering times n of each sensor in a unit time period t;

step 2: defining event types according to the signal triggering times n of each sensor in the unit time period t to obtain different event types;

and step 3: generating signal pulses with different pulse widths corresponding to each event type according to the event type;

further, the pulse width refers to the time duration Tn during which the nV voltage is generated on the signal line.

Further, all sensors include microwave sensors and vibration sensors.

Further, the event type corresponds to the following decision conditions:

event type	Duration of signal pulse signal
		Microwave oven	T1
Strong microwave	T2
		Vibration	T3
Strong vibration	T4
		Microwave oven&Vibration	T5

The invention provides coding equipment which comprises a radio frequency antenna, an intermediate frequency signal filter, an amplifier, a comparator and a single chip microcomputer which are sequentially connected.

Because the invention adopts the technical scheme, the invention has the following beneficial effects:

in a standard protocol interface output mode, the RS485 cascade networking can effectively solve the problems and is closest to the technical method. Compared with RS485, the technical method can bear more information unlike RS485, but still has the advantages of economical construction materials and simple function realization:

RS485 uses 4 electric wires to communicate, 2 power cords, 2 data lines (data line is a sending and is received), and this technical scheme uses 3 electric wires, two power cords, 1 signal line of messenger. One wire is saved. The more sensors are deployed, the more significant the cost advantage.

Due to the chain type cascade, the RS485 adopts a polling mode, namely the system needs to run continuously. The technical method is controlled by an interrupt (a processing mode of a microprocessor), namely, the system works when needed and is in a silent idle state when not needed. The system can achieve low power consumption, and the code implementation logic is simpler.

RS485 needs microprocessor and special RS485 level conversion chip cooperation to realize, and this scheme only uses this microprocessor, does not need a level conversion device just can accomplish, has saved the device cost.

Under the condition of the same effect in certain specific application scenes, compared with RS485, the resource used and occupied by the technical method has obvious cost advantage. The method is suitable for certain projects which are sensitive to cost.

The technical method is applied to an outdoor security system which is customized and developed, and the capacity improvement of the sensing equipment in the security system can be realized through the technical method, so that the sensor can express more information instead of a simple trigger which only expresses 'existence' or 'nonexistence', and more detailed sensing information is provided for data analysis of an upper-layer system. Under the premise of not increasing the cost remarkably, the intelligent level and the accuracy degree of the security system are improved.

Drawings

Fig. 1 is a schematic diagram of output pulses.

Detailed Description

example 1

The technical concept disclosed by the invention is as follows: according to business needs, information sensed by the sensors is abstracted into different event types to obtain a set of information types so as to distinguish and transmit the information.

The sensor in the technical scheme comprises two sensing functions of microwave and vibration, and the microwave and the vibration are respectively in intensity, and according to the service requirement of an upper layer, the information of the sensor can be abstracted into different event types to form a set. For example: { microwave, vibration, microwave plus vibration, strong microwave, strong vibration }, thus completing the abstraction of information.

The method has the advantages that the microwave and vibration simulation information detected by the sensor is abstracted into event types, the complex simulation signals detected by the sensor are not required to be transmitted and output, the detected simulation signals are abstracted into a plurality of events, and more information is expressed through a plurality of event types compared with the traditional trigger type sensor, so that statistics and calculation are facilitated.

Furthermore, event types, namely conditions for occurrence of each event, are defined according to physical characteristics and business requirements of the sensors, and a corresponding relation between information detected by the sensors and the event types is obtained. For example, how a "microwave" event occurs is defined, how a "strong microwave" event is defined, or what conditions are considered to have occurred { microwave, vibration, microwave and vibration, strong microwave, strong vibration }. Can be defined as follows: for example, a sensor detecting 100 times of microwave information within 1 second is defined as a "microwave" event, and a sensor detecting 100 times of vibration information within 1 second is defined as a "vibration" event. Thus, the sensing information of the sensor is abstracted into event types. And statistics and analysis are facilitated. The definition of the event type is exemplified by the following table:

event type	Decision conditions	Duration of signal
			Microwave oven	Microwave information is detected for more than 100 times and less than 200 times within 1 second	T1
Strong microwave	Microwave information is detected for more than 200 times within 1 second	T2
			Vibration	Detecting information of more than 100 and less than secondary vibration within 1 second	T3
Strong vibration	More than 200 times of vibration information is detected in 1 second	T4
			Microwave oven&Vibration	Simultaneous detection of microwave and vibration events within 1 second	T5

The event decision of the invention is defined by adopting quantized parameters and algorithms, and event definitions can be added according to requirements. The flexibility or extensibility of the event definition is increased. And the adjustment is convenient according to the service requirement.

Furthermore, the abstraction and definition of the event are completed, namely how to output the information of the event type by using 3 wires. The three wires are a positive power line, a negative power line, and a signal line, respectively. The positive and negative power lines provide power, information cannot be carried, and only the signal line can carry information. The different event types are expressed by the voltage on the signal line and the duration of the voltage. As shown in fig. 1;

if the sensor judges that the occurrence condition of the microwave event is met, namely the microwave event is judged to occur, the nV voltage is generated on the signal wire (the voltage can be set by a person skilled in the art according to the requirement), and the duration is T1, and similarly, if the sensor judges that the vibration event occurs, the nV voltage is generated on the signal wire and the duration is T2. By analogy, different event types may be represented by different durations or levels. The goal of transmitting multiple event types has been achieved.

Information is transferred by means of a bus at different voltages and times. The number of wires required by information transmission is saved, and the cost is saved in system construction. Cascaded networking may be supported. That is, a plurality of devices share one signal line.

It is noted that, in light of the technical idea of the present invention, those skilled in the art can add the types of sensors and define more different types of events under the circumstances that the prior art can implement, and it can also be done by using one signal line to transmit the encoded signal to the post-stage processing.

Claims

1. A method of encoding and communicating a multifunction sensor output, comprising the steps of:

and step 3: and generating signal pulses with different pulse widths corresponding to the event types according to the event types.

2. The method of claim 1 for encoding and communicating the output of a multifunctional sensor, wherein: the pulse width is the duration Tn of the nV voltage generated on the signal line.

3. The method of claim 1 for encoding and communicating the output of a multifunctional sensor, wherein: all sensors include microwave sensors and vibration sensors.

4. The method of claim 1 for encoding and communicating the output of a multifunctional sensor, wherein: the event type corresponds to the following judgment conditions:

。

5. An encoding apparatus using the encoding and communication method of a multi-functional sensor output of claim 1, characterized in that: the device comprises a radio frequency antenna, an intermediate frequency signal filter, an amplifier, a comparator and a singlechip which are connected in sequence.