A buried gas pipeline detection system and portable device based on Chirp signal

Abstract

The present invention relates to the technical field of gas pipeline position detection, and more specifically, to a buried gas pipeline detection system and portable device based on Chirp signals. It includes a signal transmitting end and a signal receiving end; the signal transmitting end includes a signal transmitting unit and a simulated receiving unit. The present invention detects the position of a non-metallic gas pipeline by using a Chirp audio signal as a signal source, and simulates reception and judgment of the emitted Chirp audio signal by a simulated receiving unit before detection to obtain the intensity of the Chirp audio signal emission, and feeds back the received Chirp audio signal intensity to the simulated receiving unit through the signal receiving end, so that the simulated receiving unit judges the signal intensity, and amplifies the signal according to the judgment result, so that the user can remotely detect the gas pipeline and detect the gas pipeline at a greater depth.

Description

Technical Field

[0001] The present invention relates to the technical field of gas pipeline position detection, and in particular to a buried gas pipeline detection system and a portable device based on Chirp signals. Background Art

[0002] Engineering surveys and gas company operation and maintenance management in cities cannot avoid the problem of gas pipeline detection. Judging from the current status of gas pipeline detection technology at home and abroad, the detection technology of metal gas pipelines has matured, but the detection of non-metallic gas pipelines is still a technical problem. Because non-metallic gas pipelines are neither conductive nor magnetic, they are basically insulated and cannot be detected by commonly used metal pipeline detectors. This brings great difficulties to determining the location and burial depth of underground PE pipelines, avoiding damage caused by construction excavation, and managing and maintaining pipeline safety.

[0003] The traditional method is to use a transmitter to transmit a sound wave signal of a specific frequency into the gas pipeline. The signal propagates directionally along the gas pipeline to the far end. While the sound wave signal propagates directionally in the pressurized gas in the gas pipeline, it propagates to the ground through the soil on the pipe wall. At this time, the receiver captures the sound wave signal on the ground, and determines the vertical disturbance range of the pipe through the received strong volume area, and then accurately locates it. However, this method has a limited transmission distance and is greatly affected by environmental noise. When the noise is close to the frequency of the transmitted signal, it is impossible to distinguish whether the received signal is a valid signal, which makes it impossible to accurately detect the location of the gas pipeline, so that the gas pipeline is easily damaged in later construction. Summary of the invention

[0004] The purpose of the present invention is to provide a buried gas pipeline detection system and a portable device based on Chirp signals to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, one of the objects of the present invention is to provide a buried gas pipeline detection system based on Chirp signal, including a signal transmitting end and a signal receiving end;

[0006] The signal transmitting end is used to send signals to the inside of the gas pipeline and simulate receiving the sent signals;

[0007] The signal transmitting end includes a signal transmitting unit and a simulated receiving unit;

[0008] The signal transmitting unit is used to generate a Chirp audio signal and send the Chirp audio signal to the inside of the gas pipeline;

[0009] The simulated receiving unit is used to simulate the signal sent by the receiving signal transmitting unit before detection, and determine whether the signal strength of the received data is qualified;

[0010] The signal receiving end is used to receive the signal sent to the gas pipeline by the signal transmitting end;

[0011] The signal receiving end includes a signal receiving unit and an audio playing unit;

[0012] The signal receiving unit is used to receive the signal sent by the signal transmitting unit;

[0013] The audio playing unit is used to play the signal received by the signal receiving unit.

[0014] As a further improvement of the technical solution, the signal transmitting unit includes a signal encoding module, a signal amplification module and a power amplification module;

[0015] The signal encoding module is used to encode the Chirp audio signal and determine the playing frequency of the Chirp audio signal;

[0016] The signal amplification module is used to amplify the Chirp audio signal encoded by the signal encoding module;

[0017] The power amplification module is used to amplify the power of signal transmission and send the amplified signal to the gas pipeline.

[0018] As a further improvement of the technical solution, the signal transmitting unit further includes an external noise collection module and a noise intensity offset judgment module;

[0019] The external noise collection module is used to receive the noise in the external environment and determine the sound level of the noise according to the received noise;

[0020] The noise intensity cancellation judgment module is used to judge the signal intensity of the Chirp audio signal sent by the signal amplification module according to the sound level of the noise judged by the external noise collection module.

[0021] As a further improvement of the technical solution, the signal encoding module expresses the Chirp audio signal as follows:

[0022]

[0023] Among them, t is time, f0 is the starting frequency, the starting frequency is 200Hz, and k is the modulation frequency.

[0024] As a further improvement of the technical solution, the simulated receiving unit includes an offset position acquisition module, a signal strength judgment module, and a signal enhancement control module;

[0025] The offset position acquisition module is used to collect sound waves at positions around where the signal transmitting unit transmits sound waves into the gas pipeline;

[0026] The signal strength judgment module is used to judge the signal strength of the signal collected by the offset position collection module;

[0027] The signal enhancement control module is used to receive the result determined by the signal strength determination module, and perform enhancement control simulation on the signal according to the result determined by the signal strength determination module.

[0028] As a further improvement of the technical solution, the signal receiving unit includes a vibration signal sensing module, an analog-to-digital conversion module, a time-frequency analysis module, a filtering processing module and a display module;

[0029] The vibration signal sensor module is used to receive weak vibration signals from the ground;

[0030] The analog-to-digital conversion module is used to perform analog-to-digital conversion on the weak ground vibration signal received by the vibration signal sensor module;

[0031] The time-frequency analysis module is used to perform time-frequency analysis on the received weak vibration signal;

[0032] The filtering processing module is used to filter the data analyzed by the time-frequency analysis module to remove the received signals except the Chirp audio signal;

[0033] The display module is used to display the signal filtered by the filtering processing module.

[0034] As a further improvement of the technical solution, the signal receiving unit further includes a signal strength feedback module, and the simulated receiving unit further includes a feedback data processing module;

[0035] The signal strength feedback module is used to receive the signal received by the vibration signal sensor module and feed the received signal back to the feedback data processing module;

[0036] The feedback data processing module is used to receive the signal from the signal strength feedback module, and transmit the received signal to the signal strength judgment module for strength judgment.

[0037] The second object of the present invention is to provide a portable device for carrying the buried gas pipeline detection system based on Chirp signal as described above, comprising the following method steps: comprising a sound pickup device, one end of the sound pickup device is connected to a signal analyzer, one end of the signal analyzer is connected to an earphone, one side of the sound pickup device is provided with a signal transmitting device used in conjunction with the signal analyzer and an audio oscillator connected to the signal transmitting device;

[0038] The signal encoding module, external noise collection module and noise intensity offset judgment module are arranged inside the signal transmitting device; the signal amplification module and power amplification module are arranged inside the audio oscillator, the vibration signal sensing module is arranged inside the sound pickup device, and the analog-to-digital conversion module, time-frequency analysis module, filtering processing module, signal strength feedback module and display module are all arranged inside the signal analyzer.

[0039] As a further improvement of the technical solution, the signal analyzer includes a display and handles fixed on both sides of the display for holding, an arc-shaped fixed baffle is fixed on one side of the display, and an arc-shaped movable plate is slidably provided on one side of the fixed baffle.

[0040] As a further improvement of the technical solution, the sound pickup device includes a pickup and a telescopic rod mounted on the pickup, an auxiliary device is installed at the bottom of the pickup, the auxiliary device includes a connector threadedly connected to the bottom of the pickup, a piercing rod is fixed to the bottom of the connector, a fitting plate is slidably arranged on the piercing rod, a spring is arranged between the fitting plate and the connector, and the connector and the fitting plate are connected by a plurality of hinge rods hinged in a ring arrangement.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. In the buried gas pipeline detection system and portable device based on Chirp signal, the position of the non-metallic gas pipeline is detected by using Chirp audio signal as the signal source, and before detection, the transmitted Chirp audio signal is simulated and received and judged by the intended receiving simulation unit to obtain the intensity of the Chirp audio signal emission, so as to ensure that within the specified range, the intensity of the Chirp audio signal received by the intended receiving simulation unit meets the judgment rule set by the intended receiving simulation unit, so as to ensure that during the inspection process of the operator, the signal receiving end can well receive the Chirp audio signal transmitted from the inside of the gas pipeline, thereby improving the accuracy of gas pipeline position detection and avoiding damage to the gas pipeline during construction later.

[0043] 2. In the buried gas pipeline detection system and portable device based on Chirp signal, the strength of the received Chirp audio signal is fed back to the intended receiving analog unit through the signal receiving end, so that the intended receiving analog unit judges the signal strength and amplifies the signal according to the judgment result. When the user performs remote detection of the gas pipeline, the signal transmitting end will automatically amplify the strength of the transmitted Chirp audio signal, so that the signal receiving end performing remote operation can receive the signal transmitted by the signal transmitting end, so as to improve the accuracy of long-distance detection of the gas pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is one of the overall flow charts of the present invention;

[0045] Figure 2 This is the second overall flow chart of the present invention;

[0046] Figure 3 is a block diagram of a signal transmitting unit of the present invention;

[0047] Figure 4 It is a block diagram of a simulated receiving unit of the present invention;

[0048] Figure 5 A block diagram of a signal receiving unit of the present invention;

[0049] Figure 6 It is a schematic diagram of the assembly structure of the overall device of the present invention;

[0050] Figure 7 It is a structural schematic diagram of a signal analyzer of the present invention;

[0051] Figure 8 It is a schematic diagram of the structure of the sound pickup device of the present invention;

[0052] Fig. 9 It is a schematic diagram of the structure of the auxiliary device of the present invention;

[0053] Fig.10 Schematic diagram of the pickup and tripod installation structure.

[0054] The meaning of each number in the figure is:

[0055] 1. Signal transmitting end; 11. Signal transmitting unit; 111. Signal encoding module; 112. Signal amplifying module; 113. Power amplifying module; 114. External noise collecting module; 115. Noise intensity offset judging module; 12. Simulated receiving unit; 121. Offset position collecting module; 122. Signal intensity judging module; 123. Signal enhancement control module; 124. Feedback data processing module;

[0056] 2. Signal receiving end; 21. Signal receiving unit; 211. Vibration signal sensing module; 212. Analog-to-digital conversion module; 213. Time-frequency analysis module; 214. Filter processing module; 215. Signal strength feedback module; 216. Display module; 22. Audio playback unit;

[0057] 3. Signal transmitting device; 4. Audio oscillator; 5. Signal analyzer; 51. Display; 52. Handle; 53. Fixed baffle; 54. Moving plate; 6. Sound pickup device; 61. Sound pickup; 62. Auxiliary device; 621. Connector; 622. Fitting plate; 623. Hinge rod; 624. Spring; 625. Insertion rod; 63. Telescopic rod; 7. Earphone. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] Example 1

[0062] See also Figure 1-Figure 5 As shown, one of the purposes of this embodiment is to provide a buried gas pipeline detection system based on Chirp signal, including a signal transmitting end 1 and a signal receiving end 2;

[0063] The signal transmitting end 1 is used to send a signal to the inside of the gas pipeline, and simulate the reception of the sent signal to determine whether the strength of the sent signal can be normally received, so as to ensure that the signal receiving end 2 can normally receive the information sent by the signal transmitting end 1;

[0064] The signal transmitting end 1 comprises a signal transmitting unit 11 and a simulated receiving unit 12;

[0065] The signal transmitting unit 11 is used to generate a Chirp audio signal and send the Chirp audio signal to the inside of the gas pipeline. The Chirp audio signal has a long transmission distance, good autocorrelation, and is easy to detect, so that the signal receiving end 2 can receive the Chirp audio signal at a long distance, which is convenient for the user to determine the location of the gas pipeline;

[0066] The signal transmitting unit 11 includes a signal encoding module 111, a signal amplifying module 112 and a power amplifying module 113;

[0067] The signal encoding module 111 is used to encode the Chirp audio signal and determine the playing frequency of the Chirp audio signal;

[0068] The expression formula of the signal encoding module 111 in encoding the Chirp audio signal is:

[0069]

[0070] Where, t is time, f0 is the starting frequency, the starting frequency is 200Hz, and k is the modulation frequency;

[0071] The signal amplification module 112 is used to amplify the Chirp audio signal encoded by the signal encoding module 111, so as to increase the transmission distance and strength of the Chirp audio signal in the gas pipeline, so that when the user detects the location of the gas pipeline, the location of the gas pipeline will not be misjudged due to the large blind area.

[0072] The power amplifier module 113 is used to amplify the power of the signal transmission and send the amplified signal to the gas pipeline to ensure that when the signal is transmitted to the gas pipeline, the gas pipeline detection distance is too long to receive the signal, so as to ensure the normal transmission of the Chirp audio signal in the gas pipeline and improve the accuracy of the gas pipeline position detection;

[0073] The signal transmitting unit 11 further includes an external noise collecting module 114 and a noise intensity cancellation judging module 115;

[0074] The external noise collection module 114 is used to receive the noise in the external environment and determine the sound level of the noise according to the received noise;

[0075] The noise intensity cancellation judgment module 115 is used to judge the signal strength of the Chirp audio signal sent by the signal amplification module 112 according to the sound shell size of the noise judged by the external noise collection module 114, so as to distinguish the frequency range of the Chirp audio signal and the noise signal, so as to facilitate the signal receiving end 2 to receive the Chirp audio signal;

[0076] The simulated receiving unit 12 is used to simulate the signal sent by the signal transmitting unit 11 before detection, and judge whether the signal strength of the received data is qualified, so as to measure the signal strength sent by the signal transmitting unit 11 according to the judgment result, so as to ensure that when detecting the position of the gas pipeline, the signal receiving end 2 can normally receive the signal sent by the signal transmitting unit 11. When judging the signal strength, the received signal is correlated with the transmitted signal, and it is judged to be qualified if the correlation coefficient is greater than 0.5;

[0077] The intended receiving simulation unit 12 includes an offset position acquisition module 121, a signal strength determination module 122, and a signal enhancement control module 123;

[0078] The offset position acquisition module 121 is used to collect sound waves at the surrounding positions where the signal transmitting unit 11 transmits sound waves into the gas pipeline;

[0079] The signal strength judgment module 122 is used to judge the signal strength of the signal collected by the offset position acquisition module 121 to determine whether the collected signal strength meets the requirements of limited number transmission, so as to ensure that the signal strength emitted by the signal transmitting unit 11 meets the requirements;

[0080] The signal enhancement control module 123 is used to receive the result of the judgment of the signal strength judgment module 122, and perform enhancement control simulation on the signal according to the result of the judgment of the signal strength judgment module 122 to form the strength of the Chirp audio signal emitted by the signal transmitting unit 11, so as to ensure that the Chirp audio signal emitted by the signal transmitting unit 11 can be easily captured by the signal receiving end 2.

[0081] The signal receiving end 2 is used to receive the signal sent to the gas pipeline by the signal transmitting end 1, so that the user can judge the position of the gas pipeline according to the signal strength received at different positions to obtain the approximate direction of the gas pipeline;

[0082] The signal receiving end 2 comprises a signal receiving unit 21 and an audio playing unit 22;

[0083] The signal receiving unit 21 is used to receive the signal sent by the signal transmitting unit 11, so that the user can determine the location of the gas pipeline according to the strength of the received signal;

[0084] The signal receiving unit 21 includes a vibration signal sensing module 211, an analog-to-digital conversion module 212, a time-frequency analysis module 213, a filtering processing module 214 and a display module 216;

[0085] The vibration signal sensor module 211 is used to receive weak vibration signals from the ground, and the vibration signals include chirp audio signals and noise near the ground;

[0086] The analog-to-digital conversion module 212 is used to perform analog-to-digital conversion on the weak ground vibration signal received by the vibration signal sensor module 211;

[0087] The time-frequency analysis module 213 is used to perform time-frequency analysis on the received weak vibration signal, so as to clearly describe the received Chirp audio signal and analyze the change of the signal frequency over time, so as not to miss the tiny signal during long-distance detection;

[0088] The filtering processing module 214 is used to filter the data analyzed by the time-frequency analysis module 213 to remove the received signals except the Chirp audio signal so that the system can clearly describe the signal;

[0089] The display module 216 is used to display the signal filtered by the filtering processing module 214 so that the user can clearly observe the signal data;

[0090] The audio playing unit 22 is used to play the signal received by the signal receiving unit 21 so that the user can hear the signal strength received by the signal transmitting unit 11, and the user can determine the location of the gas pipeline according to the signal strength received at different locations.

[0091] The signal receiving unit 21 further includes a signal strength feedback module 215, and the simulated receiving unit 12 further includes a feedback data processing module 124;

[0092] The signal strength feedback module 215 is used to receive the signal received by the vibration signal sensor module 211, and feed the received signal back to the feedback data processing module 124;

[0093] The feedback data processing module 124 is used to receive the signal from the signal strength feedback module 215 and transmit the received signal to the signal strength determination module 122 for strength determination.

[0094] When this embodiment is in use, the signal encoding module 111 encodes the Chirp audio signal and transmits the information to the signal amplifying module 112 after encoding. At the same time, the external noise collection module 114 collects the noise near the working position, and determines the sound wave intensity for canceling the noise through the noise intensity cancellation judgment module 115 to reduce the influence of the external noise on the Chirp audio signal, and sends the judgment result to the signal amplifying module 112. The signal amplifying module 112 amplifies the Chirp audio signal and amplifies the power through the power amplifying module 113. After the amplification is completed, the Chirp audio signal is sent to the gas pipeline. The Chirp audio signal sent to the gas pipeline is collected by the offset position collection module 121 set around the working position, and the signal strength is judged by the signal strength judgment module 122. When the signal strength meets the standard, the Chirp audio signal is not enhanced. When the signal strength judgment module 122 determines that the strength of the collected Chirp audio signal does not meet the standard, the signal strength judgment module 122 determines that the Chirp audio signal is not enhanced. The signal enhancement control module 123 formulates a signal for enhancing the Chirp audio signal, and transmits the enhanced signal to the signal amplification module 112 through the feedback data processing module 124, so that the signal amplification module 112 enhances the Chirp audio signal. The vibration signal sensing module 211 collects the Chirp audio signal in the gas pipeline, and processes the Chirp audio signal through the analog-to-digital conversion module 212, the time-frequency analysis module 213 and the filtering processing module 214, and displays the processed signal through the display module 216. At the same time, the signal strength feedback module 215 receives the signal of the vibration signal sensing module 211, and sends the received signal to the feedback data processing module 124, so that the feedback data processing module 124 sends the signal to the signal strength judgment module 122, and the signal strength judgment module 122 judges the strength of the Chirp audio signal, so that when performing long-distance detection, the signal receiving end 2 set at a distance can easily receive the signal sent by the signal transmitting end 1, so that the position of the gas pipeline can be accurately detected.

[0095] The second object of the present invention is to provide a portable device for carrying a buried gas pipeline detection system based on Chirp signal including any one of the above items, referring to Figure 6-Figure 7 , comprising a sound pickup device 6, one end of the sound pickup device 6 is connected to a signal analyzer 5, one end of the signal analyzer 5 is connected to an earphone 7, one side of the sound pickup device 6 is provided with a signal transmitter 3 used in conjunction with the signal analyzer 5 and an audio oscillator 4 connected to the signal transmitter 3;

[0096] The signal encoding module 111, the external noise collection module 114 and the noise intensity cancellation judgment module 115 are arranged inside the signal transmitting device 3; the signal amplification module 112 and the power amplification module 113 are arranged inside the audio oscillator 4, the vibration signal sensing module 211 is arranged inside the sound pickup device 6, and the analog-to-digital conversion module 212, the time-frequency analysis module 213, the filtering processing module 214, the signal strength feedback module 215 and the display module 216 are all arranged inside the signal analyzer 5.

[0097] In order to ensure that the displayed data can be clearly seen when the signal analyzer 5 is used in an environment with high light intensity, the signal analyzer 5 includes a display 51 and handles 52 fixed on both sides of the display 51 for holding. An arc-shaped fixed baffle 53 is fixed to one side of the display 51, and an arc-shaped movable plate 54 is slidably provided on one side of the fixed baffle 53. The movable plate 54 rotates on the fixed baffle 53 to block the display 51, so that the screen on the display 51 is displayed in the shadow formed by the fixed baffle 53 and the movable plate 54 blocking the sunlight, so that the user can observe the data on the display 51.

[0098] In order to prevent the sound pickup device 6 from contacting the soil during use, the sound pickup device 6 includes a sound pickup 61 and a telescopic rod 63 sleeved on the sound pickup 61, and an auxiliary device 62 is installed at the bottom of the sound pickup 61. The auxiliary device 62 includes a connector 621 threadedly connected to the bottom of the sound pickup 61;

[0099] refer to Fig.10 When performing sound pickup operation on a hard road surface, a tripod is installed on the pickup and placed on the ground to facilitate coupling between the pickup 61 and the ground.

[0100] refer to Figure 8-Figure 9 When performing sound pickup operation on a soft road surface, a piercing rod 625 is fixed to the bottom of the connecting head 621, and a fitting plate 622 is slidably arranged on the piercing rod 625. A spring 624 is arranged between the fitting plate 622 and the connecting head 621, and the connecting head 621 and the fitting plate 622 are connected by a plurality of hinge rods 623 hingedly arranged in a ring shape. When the auxiliary device 62 is in use, the piercing rod 625 pierces the ground, and the fitting plate 622 contacts the ground. The spring 624 elastically pushes the fitting plate 622 to make the fitting plate 622 fit closely to the ground, and controls the distance that the piercing rod 625 penetrates into the soil to avoid the soil and the pickup 61 from contacting due to the piercing rod 625 penetrating too deep into the soil, thereby affecting the ability of the pickup 61 to receive signals.

[0101] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A buried gas pipeline detection system based on Chirp signal, characterized in that: It comprises a signal transmitting end (1) and a signal receiving end (2); The signal transmitting end (1) is used to send a signal to the inside of the gas pipeline and simulate the reception of the sent signal; The signal transmitting end (1) comprises a signal transmitting unit (11) and a simulated receiving unit (12); The signal transmitting unit (11) is used to generate a Chirp audio signal and send the Chirp audio signal to the inside of the gas pipeline; The simulated receiving unit (12) is used to simulate the signal sent by the receiving signal transmitting unit (11) before detection, and to judge whether the signal strength of the received data is qualified; The signal receiving end (2) is used to receive the signal sent by the signal transmitting end (1) to the gas pipeline; The signal receiving end (2) comprises a signal receiving unit (21) and an audio playing unit (22); The signal receiving unit (21) is used to receive the signal sent by the signal transmitting unit (11); The audio playing unit (22) is used to play the signal received by the signal receiving unit (21); The signal transmitting unit (11) comprises a signal encoding module (111), a signal amplifying module (112) and a power amplifying module (113); The signal encoding module (111) is used to encode the Chirp audio signal and determine the playing frequency of the Chirp audio signal; The signal amplification module (112) is used to amplify the Chirp audio signal encoded by the signal encoding module (111); The power amplification module (113) is used to amplify the power of signal transmission and send the amplified signal to the gas pipeline; The signal transmitting unit (11) further comprises an external noise collecting module (114) and a noise intensity offset judging module (115); The external noise collection module (114) is used to receive noise in the external environment and determine the sound level of the noise based on the received noise; The noise intensity cancellation judgment module (115) is used to judge the signal intensity of the chirp audio signal sent by the signal amplification module (112) according to the sound level of the noise judged by the external noise collection module (114).

2. The buried gas pipeline detection system based on Chirp signal according to claim 1 is characterized in that: The signal encoding module (111) encodes the Chirp audio signal using the following expression: Among them, t is time, f0 is the starting frequency, the starting frequency is 200Hz, and k is the modulation frequency.

3. The buried gas pipeline detection system based on Chirp signal according to claim 1 is characterized in that: The simulated receiving unit (12) comprises an offset position acquisition module (121), a signal strength determination module (122), and a signal enhancement control module (123); The offset position acquisition module (121) is used to collect sound waves at positions around where the signal emission unit (11) emits sound waves into the gas pipeline; The signal strength judgment module (122) is used to judge the signal strength of the signal collected by the offset position collection module (121); The signal enhancement control module (123) is used to receive the result determined by the signal strength determination module (122), and perform enhancement control simulation on the signal according to the result determined by the signal strength determination module (122).

4. The buried gas pipeline detection system based on Chirp signal according to claim 1 is characterized in that: The signal receiving unit (21) comprises a vibration signal sensing module (211), an analog-to-digital conversion module (212), a time-frequency analysis module (213), a filtering processing module (214) and a display module (216); The vibration signal sensing module (211) is used to receive weak vibration signals from the ground; The analog-to-digital conversion module (212) is used to perform analog-to-digital conversion on the weak ground vibration signal received by the vibration signal sensor module (211); The time-frequency analysis module (213) is used to perform time-frequency analysis on the received weak vibration signal; The filtering processing module (214) is used to filter the data analyzed by the time-frequency analysis module (213) to remove the received signals except the Chirp audio signal; The display module (216) is used to display the signal filtered by the filtering processing module (214).

5. The buried gas pipeline detection system based on Chirp signal according to claim 4 is characterized in that: The signal receiving unit (21) further comprises a signal strength feedback module (215), and the simulated receiving unit (12) further comprises a feedback data processing module (124); The signal strength feedback module (215) is used to receive the signal received by the vibration signal sensing module (211), and feed the received signal back to the feedback data processing module (124); The feedback data processing module (124) is used to receive the signal from the signal strength feedback module (215), and transmit the received signal to the signal strength judgment module (122) for strength judgment.

6. A portable device for carrying the buried gas pipeline detection system based on Chirp signal according to any one of claims 1 to 5, characterized in that: The invention comprises a sound pickup device (6), one end of which is connected to a signal analyzer (5), one end of which is connected to an earphone (7), and one side of the sound pickup device (6) is provided with a signal transmitter (3) used in conjunction with the signal analyzer (5) and an audio oscillator (4) connected to the signal transmitter (3); The signal encoding module (111), the external noise collection module (114) and the noise intensity cancellation judgment module (115) are arranged inside the signal transmitting device (3); the signal amplification module (112) and the power amplification module (113) are arranged inside the audio oscillator (4); the vibration signal sensing module (211) is arranged inside the sound pickup device (6); the analog-to-digital conversion module (212), the time-frequency analysis module (213), the filtering processing module (214), the signal intensity feedback module (215) and the display module (216) are all arranged inside the signal analyzer (5).

7. The portable device for carrying the Chirp signal-based buried gas pipeline detection system according to claim 6, characterized in that: The signal analyzer (5) comprises a display (51) and grips (52) fixed on both sides of the display (51) for holding, a curved fixed baffle (53) being fixed on one side of the display (51), and a curved movable plate (54) being slidably provided on one side of the fixed baffle (53).

8. The portable device for carrying the Chirp signal-based buried gas pipeline detection system according to claim 6, characterized in that: The sound pickup device (6) comprises a sound pickup (61) and a telescopic rod (63) sleeved on the sound pickup (61); an auxiliary device (62) is installed at the bottom of the sound pickup (61); the auxiliary device (62) comprises a connector (621) threadedly connected to the bottom of the sound pickup (61); a piercing rod (625) is fixed at the bottom of the connector (621); a fitting plate (622) is slidably arranged on the piercing rod (625); a spring (624) is arranged between the fitting plate (622) and the connector (621); and the connector (621) and the fitting plate (622) are connected via a plurality of hinge rods (623) hingedly arranged in an annular manner.

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