CN114170750A

CN114170750A - Intrusion alarm system and method based on P-S wave detection

Info

Publication number: CN114170750A
Application number: CN202111532776.4A
Authority: CN
Inventors: 姚珍栋; 王东华; 郭文峰; 马思凯
Original assignee: Guangzhou Hongxinda Technology Co ltd
Current assignee: Guangzhou Hongxinda Technology Co ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-03-11

Abstract

The invention discloses an intrusion alarm system and method based on P-S wave detection, and belongs to the technical field of alarm devices. The system comprises 3 detectors and a receiving alarm, and is characterized in that the detectors are used for receiving P wave and S wave signals and comprise probes, filtering detectors, analog-to-digital converters and Beidou positioning modules; the receiving alarm is connected with the 3 detectors through data lines and used for ranging and positioning the P-S wave signals, sending out alarm sound or vibration and displaying the invasion direction. The method comprises the following specific steps: the detector receives the P-S wave signal and sends the P-S wave signal to the receiving alarm, the receiving alarm carries out distance measurement and positioning on the P-S wave signal, alarm sound or vibration is emitted, and the invasion direction is displayed. The system and the method are used for finding danger in advance when the system and the method are used for field camping or camping.

Description

Intrusion alarm system and method based on P-S wave detection

Technical Field

The invention particularly relates to an intrusion alarm system and method based on P-S wave detection, and belongs to the technical field of alarm devices.

Background

With the improvement of living standard of people, the field camping becomes an increasingly common living mode, but the accompanying dangerous accidents in the camping also increase year by year, and the attack events of lawless persons or beasts occur occasionally during the field camping, which becomes the volatile psychological shadow of some people during the field camping.

Similarly, when soldiers camp in the field, sentry guard standing needs to be issued to prevent attacks by enemies or wild animals, but due to fierce battlefield confrontation, fatigue is inevitably generated when the soldiers stand at night, wrong condition and leakage are easy to occur, enemies can be given the opportunity to live, and particularly when a single soldier camps, under the condition of not using other tools, sufficient rest and high guard are often not obtained at the same time, which is very dangerous for the soldiers.

Therefore, there is a need for an anti-intrusion alarm device that can provide safe driving and protection for camping enthusiasts to a certain extent, and reduce the risk. The night guard can assist soldiers to stand at night for warning, discover possible dangers in advance and strive for time for reasonable countermeasures.

Disclosure of Invention

Therefore, aiming at the defects in the prior art, the invention provides an intrusion alarm system and method based on P-S wave detection

The specific technical scheme is as follows:

an intrusion alarm system based on P-S wave detection comprises 3 detectors and a receiving alarm, and is characterized in that the detectors are used for receiving P wave and S wave signals and comprise probes, filtering detectors, analog-to-digital converters and Beidou positioning modules; the receiving alarm is connected with the 3 detectors through data lines and used for ranging and positioning the P-S wave signals, sending out alarm sound or vibration and displaying the invasion direction.

Furthermore, the filter detector is positioned at the upper end of the probe and used for filtering the received vibration waves and detecting useful signals; the analog-to-digital converter is integrated with the filter detector and is used for performing analog-to-digital conversion on a useful signal in the detector; and the Beidou positioning module and the filter detector are integrally installed and are used for carrying out time synchronization on the 3 detectors and the receiving alarm.

Further, the receiving alarm is a mobile phone provided with a special APP.

On the other hand, the invention also provides an intrusion alarm method based on P-S wave detection, which specifically comprises the following steps: the detector receives the P-S wave signal and sends the P-S wave signal to the receiving alarm, the receiving alarm carries out distance measurement and positioning on the P-S wave signal, alarm sound or vibration is emitted, and the invasion direction is displayed.

Further, the method that the detector receives the P-S wave signal and sends the P-S wave signal to the receiving alarm specifically comprises the following steps: the sensor in the shallow ground receives the vibration sent by people, vehicles or animals, and the vibration is converted into a digital signal after being filtered and detected, and is accessed into a receiving alarm through a data line.

Further, the ranging and positioning method specifically comprises: measuring the distance of the vibration source according to the time difference between the P wave and the S wave; and forming 2 half-hyperbolic curves by using 3 detectors, solving the intersection point of the 2 half-hyperbolic curves, and determining the position of the vibration.

Further, in the method, a threshold value is set by a receiving alarm.

The invention has the beneficial effects that: compared with the prior art, the intrusion alarm system and the method based on P-S wave detection have the following advantages that:

1. the enemy can be forecasted in advance under the condition that the enemy is not aware of the enemy, and time is strived for adopting a countermeasure.

2. And the connection is realized in a wired mode, so that electromagnetic radiation is avoided.

3. The receiver of the device can be replaced by a mobile phone, and other components can be accommodated into a cigarette box, so that the cigarette box is small in size, light in weight, small in size and convenient to carry.

4. The guard is far away, and the guard distance can reach more than 1000 meters theoretically.

5. The warning range is wide, and the omnidirectional warning can be carried out on the camping place.

6. The sensitivity is adjustable as required, and the method can be suitable for different environments to meet the requirements of different warning distances.

7. The alarm does not need to be set far away from the camp, and the setting method is simple.

Drawings

FIG. 1 is a schematic diagram of the components of an intrusion alarm system based on P-S wave detection;

FIG. 2 is a schematic diagram of the operation of the detector and the receiving alarm;

fig. 3 is a time difference positioning geometry diagram.

Detailed Description

The following description of the embodiments of the present invention is provided with reference to the accompanying drawings:

system components

The system mainly comprises 3 detectors, 1 receiving alarm, and corresponding data lines and interfaces.

As shown in fig. 1;

and (I) 3 detectors which are positioned around the camp. When the device works, the device is inserted into the superficial ground and is used for receiving P wave and S wave signals. The device comprises a probe, a filter detector, an analog-to-digital converter and a Beidou positioning module. The filtering wave detector is positioned at the upper end of the probe and is used for filtering the received vibration waves and detecting a useful signal; the analog-to-digital converter and the filter detector are integrally installed. The useful signal in the detector is subjected to analog-to-digital conversion, so that the useful signal can be conveniently transmitted to a receiving alarm. And the Beidou positioning module and the filter detector are integrally installed. For time synchronization of the three detectors with the receiving alarm.

And (II) a receiving alarm connected with the 3 detectors by data lines. A special receiving alarm can be arranged or replaced by a mobile phone provided with a special APP, and the method is mainly used for measuring and positioning the distance of the P-S wave signal. And (5) giving out alarm sound or vibration and displaying the invasion direction.

The working process is as follows:

the sensor located in the shallow ground receives vibration sent by people, vehicles or animals, the vibration is converted into a digital signal after filtering and detection, the receiving alarm is connected through a data line and carries out direction finding and positioning and judges possible invasion directions and distances, a certain threshold value can be set by the receiving alarm, the vibration in a certain distance is shielded, and false alarm is prevented. As shown in fig. 2.

The realization principle is as follows:

when people, vehicles, animals and the like move around a camp, certain vibration is generated on the ground, the vibration waves are mainly transmitted in a P wave and S wave mode, the system can measure the distance of a vibration source according to the time difference of the P wave and the S wave, a certain distance (for example, 50 meters) can be set, the vibration in the distance is shielded, and the alarm caused by the actions of the user or other nearby teammates is prevented. Secondly, the direction finding and positioning are carried out according to the time difference of the P wave reaching the three detectors, and the approximate direction of the invasion is obtained.

Principle of distance measurement

V_PV_SP-wave and S-wave velocities, respectively, are empirical values. T is P-S wave time difference which can be measured according to P-S wave arrival time difference, and R is the distance from the vibration point to the detection point according to the formula:

R/V_S-R/V_P＝T

the distance R can be obtained.

Principle of direction finding

In a two-dimensional plane, the time difference of arrival of the P-wave signal at the 2 detectors is a half-hyperbolic curve with the 2 detector positions as the focal points. And 3 detectors are utilized to form 2 half-side hyperbolas, and the intersection point of the 2 half-side hyperbolas is solved, so that the position of the vibration can be determined. The 3 detector positions A (main), B (right), C (left) and T (seismic source) are shown in FIG. 3.

The three detector coordinate positions shown in fig. 3 are:

in the formula: i is 1, 2; c is 6000 m/s; tau is_i0Representing the time difference between the P-wave signal to the left (right) detector and the main detector, as measured by the time difference.

The positions of the 3 detectors can be known through Beidou positioning, and the position of the seismic source can be obtained through a formula.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An intrusion alarm system based on P-S wave detection comprises 3 detectors and a receiving alarm, and is characterized in that the detectors are used for receiving P wave and S wave signals and comprise probes, filtering detectors, analog-to-digital converters and Beidou positioning modules; the receiving alarm is connected with the 3 detectors through data lines and used for ranging and positioning the P-S wave signals, sending out alarm sound or vibration and displaying the invasion direction.

2. The P-S wave detection based intrusion alarm system according to claim 1, wherein the filter detector is located at an upper end of the probe for detecting the useful signal after filtering the received vibration wave; the analog-to-digital converter is integrated with the filter detector and is used for performing analog-to-digital conversion on a useful signal in the detector; and the Beidou positioning module and the filter detector are integrally installed and are used for carrying out time synchronization on the 3 detectors and the receiving alarm.

3. The P-S wave detection based intrusion alarm system according to claim 1, wherein the receiving alarm is a mobile phone installed with a dedicated APP.

4. An intrusion alarm method based on P-S wave detection implemented by the intrusion alarm system based on P-S wave detection according to any one of claims 1 to 3, the method comprising: the detector receives the P-S wave signal and sends the P-S wave signal to the receiving alarm, the receiving alarm carries out distance measurement and positioning on the P-S wave signal, alarm sound or vibration is emitted, and the invasion direction is displayed.

5. The intrusion alarm method based on P-S wave detection according to claim 4, wherein the method for receiving the P-S wave signal and sending the P-S wave signal to the receiving alarm by the detector is specifically as follows: the sensor in the shallow ground receives the vibration sent by people, vehicles or animals, and the vibration is converted into a digital signal after being filtered and detected, and is accessed into a receiving alarm through a data line.

6. The intrusion alarm method based on P-S wave detection according to claim 4, wherein the distance measurement and positioning in the method specifically comprises: measuring the distance of the vibration source according to the time difference between the P wave and the S wave; and forming 2 half-hyperbolic curves by using 3 detectors, solving the intersection point of the 2 half-hyperbolic curves, and determining the position of the vibration.

7. The P-S wave detection based intrusion alert method according to claim 4, wherein a receiving alarm sets a threshold value.