A system for verifying the time precision of a tb timestamp recording device and a method thereof

Abstract

The application discloses a system for verifying the time precision of a TB time stamp recording device and a method thereof, which comprises a GPS antenna, a GPS receiver module, a microprocessor and a NAND gate; the GPS antenna is used for receiving signals transmitted by GPS satellites and transmitting the signals to the GPS receiver module; the GPS receiver module is used for outputting time service second pulses to the microprocessor and the NAND gate respectively after receiving the signals transmitted by the GPS antenna; the microprocessor is used for outputting a pulse control signal to the NAND gate according to a time information control instruction after receiving the time service second pulses transmitted by the GPS receiver module; and the NAND gate is used for outputting corresponding second pulses to the TB time stamp recording device for recording according to the received pulse control signal. The application is used for solving the technical problem that the precision of the TB time stamp recording device cannot be verified, so as to achieve the purpose of ensuring the precision of the TB time stamp recording device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of equipment precision verification, and in particular to a system and method for verifying time precision of a TB time stamp recording device. BACKGROUND

[0002] In recent years, China's seismic data acquisition technology is gradually maturing, and production equipment integrating modern technology has been widely used in the oil exploration industry. At present, there are millions of land node acquisition devices in use in the world, and they have been deeply involved in the oil exploration industry all over the world, greatly improving the efficiency of oil exploitation, reducing the investment of oil exploration period funds, and new seismic acquisition technology can also provide one-time acquisition equipment for places with very complex detection environment. In recent years, various new types of land seismic data acquisition node devices have been constantly updated and replaced, which are quietly changing the market competition pattern of China's oil exploration industry.

[0003] The most obvious feature of the new data acquisition device compared with the traditional data acquisition device is that the new acquisition device no longer needs a cable for data transmission, and the new device is equipped with a GPS positioning system and its attached functional components, so as to realize the timely automatic recording of the collected data, and use the device networking to obtain the actual time, and then mark the collected data with time through the internal program of the system, so as to realize the data staging and nodalization, which is convenient for subsequent information calling and processing. The collected data can be processed by the GPS positioning system, and the underground oil distribution situation can be fully reflected by the point graph through the arrangement and analysis of the collected data information by big data.

[0004] With the development and popularization of seismic data acquisition node instruments, supporting equipment has gradually improved, and the TB time stamp recording device is one of the main supporting equipment. The TB time stamp recording device is used to reflect the time synchronization precision of seismic exploration.

[0005] However, the TB time stamp recording devices produced by different manufacturers do not have unified technical indicators, so that users cannot determine whether the precision of the TB time stamp recording devices of different manufacturers can meet the actual needs when using them. SUMMARY

[0006] In order to overcome the shortcomings of the prior art, the present application provides a system and method for verifying the time precision of a TB time stamp recording device, which solves the technical problem that the precision of the TB time stamp recording device cannot be verified, so as to achieve the purpose of ensuring the precision of the TB time stamp recording device.

[0007] To solve the above problems, the technical scheme adopted by the present application is as follows:

[0008] A system for verifying the time precision of a TB time stamp recording device, comprising:

[0009] a GPS antenna for receiving signals transmitted by GPS satellites and transmitting the signals to a GPS receiver module;

[0010] a GPS receiver module for outputting a time service second pulse to a microprocessor and a NAND gate, respectively, after receiving the signals transmitted by the GPS antenna;

[0011] a microprocessor for outputting a pulse control signal to the NAND gate according to a time information control instruction after receiving the time service second pulse transmitted by the GPS receiver module;

[0012] a NAND gate for outputting a corresponding second pulse to the TB time stamp recording device according to the pulse control signal.

[0013] As a preferred embodiment of the present application, the NAND gate comprises a first input end, a second input end and an output end;

[0014] the first input end is used for receiving the time service second pulse, the second input end is used for receiving the time information control instruction, and the output end is used for outputting the second pulse according to the pulse control signal.

[0015] As a preferred embodiment of the present application, the microprocessor comprises an external microcomputer interface, which is used for connecting with an external microcomputer and receiving a time information control instruction transmitted by a serial port helper of the external microcomputer;

[0016] wherein the time information control instruction is used for controlling the time and the number of the second pulses output by the system.

[0017] As a preferred embodiment of the present application, the GPS receiver module starts searching for a satellite after the system is started and outputs a stable time service second pulse after the satellite is locked.

[0018] A method for verifying the time precision of a TB time stamp recording device, comprising the following steps:

[0019] receiving signals transmitted by GPS satellites through a GPS antenna and transmitting the signals to a GPS receiver module;

[0020] the GPS receiver module searching for a satellite according to the transmitted signals and outputting a stable time service second pulse to a microprocessor and a NAND gate, respectively, after the satellite is locked;

[0021] inputting a predetermined second pulse output time and the number of second pulses by a serial port helper of an external microcomputer to form a time information control instruction and transmitting the time information control instruction to the microprocessor;

[0022] The microprocessor outputs a pulse control signal to the NAND gate according to the received time information and the time signal;

[0023] The NAND gate outputs a corresponding second pulse to the TB time stamp recording device according to the pulse control signal and the time signal;

[0024] The TB time stamp recording device records the output time of the second pulse to obtain an actual second pulse output time;

[0025] The predetermined second pulse output time is compared with the actual second pulse output time to obtain a difference value, and it is determined whether the difference value is less than a threshold value, if yes, it is considered that the accuracy of the TB time stamp recording device meets the requirements.

[0026] As a preferred embodiment of the present application, when the GPS receiver module searches for a satellite according to the transmitted signal, it comprises:

[0027] The azimuth and elevation of the target satellite are obtained according to the latitude and longitude information of the place where the GPS antenna is located;

[0028] The azimuth and elevation of the reflecting surface of the GPS antenna are preset according to the azimuth and elevation of the target satellite, respectively obtaining a preset reflecting surface azimuth and a preset elevation angle;

[0029] A search space is determined with the preset reflecting surface azimuth as the center, and the search space is divided into a plurality of search regions, and a search order is set for the plurality of search regions;

[0030] The plurality of search regions are searched one by one according to the search order by using an alternating search method, and the reflecting surface azimuth and elevation angle with the largest signal are locked.

[0031] As a preferred embodiment of the present application, when the search space is divided into a plurality of search regions, it comprises:

[0032] A search range is determined with the preset reflecting surface azimuth as the center;

[0033] The search range is divided into a positive search angle and a negative search angle;

[0034] A positive search space is obtained according to the positive search angle, and a negative search space is obtained according to the negative search angle;

[0035] A division value is determined, and the positive search space and the negative search space are divided according to the division value, respectively, to obtain the plurality of search regions.

[0036] As a preferred embodiment of the present application, when setting a search order for the several search areas, it comprises:

[0037] A spiral marking step is performed on the several search areas to obtain the search order, and the spiral marking step comprises:

[0038] The search area closest to the orientation of the preset reflecting surface in the positive search space is marked as the first search area;

[0039] The search area closest to the orientation of the preset reflecting surface in the negative search space is marked as the second search area;

[0040] The search area second closest to the orientation of the preset reflecting surface in the positive search space is marked as the third search area;

[0041] The search area second closest to the orientation of the preset reflecting surface in the negative search space is marked as the fourth search area;

[0042] The above steps are repeatedly performed until the several search areas are all marked.

[0043] As a preferred embodiment of the present application, when searching the several search areas one by one by using the alternating search method, it comprises:

[0044] According to the search order, the first search area is searched first, and it is determined whether there is a signal maximum value; if not, the second search area is searched, and it is determined whether there is a signal maximum value; if not, the next area is continuously searched until the search area where the signal maximum value is located is determined.

[0045] As a preferred embodiment of the present application, when obtaining the azimuth angle and the elevation angle of the target satellite according to the longitude and latitude information of the place where the GPS antenna is located, it comprises:

[0046] The longitude of the target satellite and the longitude and latitude of the place where the GPS antenna is located are obtained, and the azimuth angle and the elevation angle of the target satellite are obtained according to the obtained information, which are specifically shown in formula 1 and formula 2:

[0047]

[0048]

[0049] In the formula, λ D is the longitude of the target satellite, λ T is the longitude of the place where the GPS antenna is located, and φ T is the latitude of the place where the GPS antenna is located.

[0050] Compared with the prior art, the present application has the beneficial effects that:

[0051] (1)GPS is a global satellite clock synchronization system with time accuracy of nanosecond level, and the application directly compares the time recorded by the TB time stamp recording device with the GPS time based on the GPS time, so as to accurately evaluate the accuracy of the TB time stamp recording device;

[0052] (2)The application can check the time error of the TB time stamp recording device, and calibrate the time according to the time error, so as to achieve the purpose of time synchronization of the seismic signal excitation device and the acquisition instrument.

[0053] The application will be further described in detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 - is a system schematic diagram for verifying the time accuracy of the TB time stamp recording device of the embodiment of the application;

[0055] Figure 2 - is an external microcomputer serial port assistant interface diagram of the embodiment of the application;

[0056] Figure 3 - is a method step diagram for verifying the time accuracy of the TB time stamp recording device of the embodiment of the application.

[0057] Explanation of reference numerals: 1, GPS antenna; 2, GPS receiver module; 3, microprocessor; 4, NAND gate; 5, external microcomputer interface; 6, external power supply interface; 7, first input end; 8, second input end; 9, output end; 10, working state indicator lamp. DETAILED DESCRIPTION

[0058] The system for verifying the time accuracy of the TB time stamp recording device provided by the application, as shown in Figure 1 , comprises: a GPS antenna 1, a GPS receiver module 2, a microprocessor 3, and a NAND gate 4. The GPS antenna 1 is used to receive the signal transmitted by the GPS satellite and transmit it to the GPS receiver module 2. The GPS receiver module 2 is used to output a time service second pulse to the microprocessor 3 and the NAND gate 4 respectively after receiving the signal transmitted by the GPS antenna 1. The microprocessor 3 is used to output a pulse control signal to the NAND gate 4 according to the time information control instruction received after receiving the time service second pulse transmitted by the GPS receiver module 2. The NAND gate 4 is used to output a corresponding second pulse to the TB time stamp recording device for recording according to the received pulse control signal.

[0059] Preferably, the GPS antenna 1 is a dual-frequency GPS antenna.

[0060] Preferably, the microprocessor 3MCU is an STM32L471VET6 microprocessor.

[0061] Further, the AND gate 4 includes a first input end 7, a second input end 8 and an output end 9. The first input end 7 is used for receiving the timing second pulse, the second input end 8 is used for receiving the time information control instruction, and the output end 9 is used for outputting the second pulse according to the received pulse control signal.

[0062] Further, the microprocessor 3 includes an external microcomputer interface 5, which is used for connecting with the external microcomputer and receiving the time information control instruction sent by the external microcomputer serial port helper. The time information control instruction is used for controlling the time and number of the system output second pulse.

[0063] Further, the microprocessor 3 further includes an external power supply interface 6, which is used for connecting with the external power supply to supply power for the microprocessor 3.

[0064] Further, the GPS receiver module 2 starts to search for stars after the system is powered on, and outputs stable timing second pulse after locking the stars.

[0065] Further, the GPS receiver module 2 is connected with a working state indicating lamp 10, which is used for indicating whether the system is in normal working state.

[0066] Specifically, as shown in Figure 3 the actual use process of the above system is as follows:

[0067] GPS receiver module 2 is connected with GPS antenna 1, receives the signal transmitted by GPS satellite, and outputs time service second pulse PPS, which is taken as one input (first input end 7) of NAND gate 4. Microprocessor 3 MCU receives the time service second pulse PPS of GPS receiver module 2, and outputs a positive / negative pulse control signal according to the time information control command sent by the serial port assistant of notebook computer, which is taken as another input (second input end) of NAND gate 4. The second pulse output end of NAND gate 4 is connected with the input cable of TB time stamp recording device; the maximum absolute time error of the output second pulse signal is less than 20 ns. In addition, GPS receiver module 2 is connected with working state indicator lamp 10, after the system is started, the red light of working state indicator lamp 10 flashes, GPS receiver module 2 starts to search for stars, and after the stars are locked within about 30 seconds, the time service second pulse PPS is stable, the green light of working state indicator lamp 10 flashes, and it is indicated that the system can work normally. Microprocessor 3 MCU is connected with the serial port assistant of notebook computer, after the verification system and the TB time stamp recording device enter the normal working state, the predetermined second pulse output time and the number of second pulses are input through the serial port assistant of notebook computer, a time information control command is formed and sent to microprocessor 3 MCU, and the feedback information can be seen through the serial port assistant, as shown in Figure 2 The predetermined time and the recorded TB time are compared, and the difference between them is the absolute TB error of the TB time stamp recording device. If the difference is less than the threshold value, it is considered that the precision of the TB time stamp recording device can meet the requirements.

[0068] The method for verifying the time precision of the TB time stamp recording device provided by the application, as shown in Figure 3 The method for verifying the time precision of the TB time stamp recording device provided by the application, as shown in

[0069] Step S1: receiving the signal transmitted by GPS satellite through GPS antenna 1 and transmitting the signal to GPS receiver module 2;

[0070] Step S2: searching for stars by GPS receiver module 2 according to the transmitted signal, and outputting stable time service second pulse to microprocessor 3 and NAND gate 4 after the stars are locked;

[0071] Step S3: inputting the predetermined second pulse output time and the number of second pulses through the serial port assistant of external microcomputer, forming a time information control command, and sending the time information control command to microprocessor 3;

[0072] Step S4: outputting a pulse control signal to NAND gate 4 by microprocessor 3 according to the received time service second pulse and the time information control command;

[0073] Step S5: the NOT gate 4 outputs a corresponding second pulse to the TB time stamp recording device according to the pulse control signal and the timing second pulse;

[0074] Step S6: the TB time stamp recording device records the output time of the second pulse to obtain an actual second pulse output time;

[0075] Step S7: comparing the predetermined second pulse output time with the actual second pulse output time to obtain a difference value, and judging whether the difference value is less than a threshold value, if yes, it is considered that the precision of the TB time stamp recording device reaches the requirement.

[0076] In the above step S7, the threshold value can be set by the user according to the actual requirement. If it is judged that the difference value is greater than or equal to the threshold value, the time calibration is performed on the excitation device and the collection instrument.

[0077] In the above step S2, when the GPS receiver module 2 searches for a satellite according to the transmitted signal, it includes:

[0078] According to the longitude and latitude information of the place where the GPS antenna 1 is located, the azimuth and elevation angles of the target satellite are obtained;

[0079] According to the azimuth and elevation angles of the target satellite, the azimuth and elevation angles of the reflecting surface of the GPS antenna 1 are preset to obtain a preset reflecting surface azimuth and a preset elevation angle, respectively;

[0080] Taking the preset reflecting surface azimuth as the center, a search space is determined, and the search space is divided into a plurality of search regions, and a search order is set for the plurality of search regions;

[0081] According to the search order, an alternating search method is used to search the plurality of search regions one by one, and the reflecting surface azimuth and elevation angle with the largest signal are locked.

[0082] Further, when the search space is divided into a plurality of search regions, it includes:

[0083] Taking the preset reflecting surface azimuth as the center, a search range is determined;

[0084] And the search range is divided into a positive search angle and a negative search angle;

[0085] According to the positive search angle, a positive search space is obtained, and according to the negative search angle, a negative search space is obtained;

[0086] A division value is determined, and the positive search space and the negative search space are divided according to the division value to obtain a plurality of search regions.

[0087] Further, when a search order is set for the plurality of search regions, it includes:

[0088] The spiral marking step is performed on several search areas to obtain a search order, and the spiral marking step comprises: marking a search area closest to the preset reflector orientation in the positive search space as a first search area; marking a search area closest to the preset reflector orientation in the negative search space as a second search area; marking a search area second closest to the preset reflector orientation in the positive search space as a third search area; marking a search area second closest to the preset reflector orientation in the negative search space as a fourth search area; and repeatedly performing the above steps until the several search areas are all marked.

[0089] Further, when the several search areas are searched one by one by using the alternate search method, the method comprises:

[0090] According to the search order, the first search area is searched first, and it is determined whether there is a signal maximum value; if not, the second search area is searched, and it is determined whether there is a signal maximum value; if not, the next area is continuously searched until the search area where the signal maximum value is located is determined.

[0091] Specifically, since the probability of obtaining a signal maximum value is greater in the search area closer to the preset reflector orientation, the search of the several search areas by using the alternate search method of the application can effectively save the search time. In addition, the alternate search method is performed in a spiral manner from the center outward, so that when the reflector orientation of the GPS antenna 1 changes, the elevation angle of the GPS antenna 1 also changes at the same time, so that the reflector orientation and the elevation angle of the GPS antenna 1 can change at the same time.

[0092] Further, when the azimuth angle and the elevation angle of the target satellite are obtained according to the longitude and latitude information of the place where the GPS antenna 1 is located, the method comprises:

[0093] The longitude of the target satellite and the longitude and latitude of the place where the GPS antenna 1 is located are obtained, and the azimuth angle and the elevation angle of the target satellite are obtained according to the obtained information, and the specific formulae are shown in formula 1 and formula 2:

[0094]

[0095]

[0096] In the formula, λ D is the longitude of the target satellite, λ T is the longitude of the place where the GPS antenna is located, and φ T is the latitude of the place where the GPS antenna is located.

[0097] Compared with the prior art, the application has the beneficial effects that:

[0098] (1) The GPS is a global satellite clock synchronization system with time precision of nanosecond level, and the time recorded by the TB time stamp recording device is directly compared with the GPS time based on the GPS time, so that the precision of the TB time stamp recording device is accurately evaluated;

[0099] (2) The time error of the TB time stamp recording device can be tested, and the time is calibrated according to the time error, so that the time synchronization of the seismic signal excitation device and the acquisition instrument is achieved.

[0100] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the protection scope of the present application.

Claims

1. A system for verifying TB timestamp logging device time precision, characterized in that, The system comprises: a GPS antenna for receiving signals transmitted by GPS satellites and transmitting the signals to a GPS receiver module; the GPS receiver module for outputting a time-second pulse to a microprocessor and a NAND gate respectively after receiving the signals transmitted by the GPS antenna; the microprocessor for outputting a pulse control signal to the NAND gate according to a time information control instruction after receiving the time-second pulse transmitted by the GPS receiver module; the NAND gate for outputting a corresponding time-second pulse to a TB time stamp recording device according to the pulse control signal; the TB time stamp recording device for recording an output time of the time-second pulse to obtain an actual output time of the time-second pulse; comparing the predetermined output time of the time-second pulse with the actual output time of the time-second pulse to obtain a difference between the two, and judging whether the difference is less than a threshold value, if yes, it is considered that the precision of the TB time stamp recording device reaches a requirement.

2. The system for verifying the TB timestamp logging device time precision according to claim 1, wherein, The NAND gate comprises a first input end, a second input end and an output end; the first input end is used for receiving the time-second pulse, the second input end is used for receiving the time information control instruction, and the output end is used for outputting the time-second pulse according to the pulse control signal.

3. The system for verifying the TB timestamp logging device time precision of claim 1, wherein, The microprocessor comprises an external microcomputer interface, which is used for connecting with an external microcomputer and receiving the time information control instruction sent by a serial port helper of the external microcomputer; wherein, the time information control instruction is used for controlling an output time and a number of time-second pulses of the system.

4. The system for verifying TB timestamp logging device time precision of claim 1, wherein, The GPS receiver module starts searching for a satellite after the system is started, and outputs a stable time-second pulse after locking the satellite.

5. A method for verifying the time precision of a TB time stamping recording device, characterized in that, The system comprises the following steps: receiving signals transmitted by GPS satellites through a GPS antenna and transmitting the signals to a GPS receiver module; the GPS receiver module searches for a satellite according to the transmitted signals, and outputs a stable time-second pulse to a microprocessor and a NAND gate respectively after locking the satellite; an external microcomputer inputs a predetermined output time of a time-second pulse and a number of time-second pulses through a serial port helper to form a time information control instruction and sends the time information control instruction to the microprocessor; the microprocessor outputs a pulse control signal to the NAND gate according to the time-second pulse and the time information control instruction; the NAND gate outputs a corresponding time-second pulse to a TB time stamp recording device according to the pulse control signal and the time-second pulse; the TB time stamp recording device records an output time of the time-second pulse to obtain an actual output time of the time-second pulse; comparing the predetermined output time of the time-second pulse with the actual output time of the time-second pulse to obtain a difference between the two, and judging whether the difference is less than a threshold value, if yes, it is considered that the precision of the TB time stamp recording device reaches a requirement.

6. The method for verifying TB timestamp logging device time precision according to claim 5, characterized in that, When the GPS receiver module searches for a satellite according to the transmitted signals, it comprises: obtaining an azimuth angle and a pitch angle of a target satellite according to longitude and latitude information of a place where the GPS antenna is located; presetting an azimuth and a pitch angle of a reflecting surface of the GPS antenna according to the azimuth angle and the pitch angle of the target satellite to obtain a preset azimuth of the reflecting surface and a preset pitch angle respectively; A search space is determined with the preset reflector orientation as the center, and the search space is divided into a plurality of search areas, and a search order is set for the plurality of search areas; The plurality of search areas are searched one by one according to the search order by using an alternating search method, and the reflector orientation and the elevation angle with the largest signal are locked.

7. The method for verifying TB timestamp logging device time precision according to claim 6, characterized in that, When the search space is divided into a plurality of search areas, the following steps are included: A search range is determined with the preset reflector orientation as the center; The search range is divided into a positive search angle and a negative search angle; A positive search space is obtained according to the positive search angle, and a negative search space is obtained according to the negative search angle; A division value is determined, and the positive search space and the negative search space are divided according to the division value, respectively, to obtain the plurality of search areas.

8. The method for verifying TB timestamp logging device time precision according to claim 7, characterized in that, When a search order is set for the plurality of search areas, the following steps are included: A spiral marking step is performed on the plurality of search areas to obtain the search order, and the spiral marking step includes: A first search area close to the preset reflector orientation in the positive search space is marked as a first search area; A second search area close to the preset reflector orientation in the negative search space is marked as a second search area; A third search area close to the preset reflector orientation in the positive search space is marked as a third search area; A fourth search area close to the preset reflector orientation in the negative search space is marked as a fourth search area; The above steps are repeatedly performed until the plurality of search areas are all marked.

9. The method for verifying TB timestamp logging device time precision according to claim 8, characterized in that, When the plurality of search areas are searched one by one by using the alternating search method, the following steps are included: According to the search order, the first search area is searched first, and it is determined whether there is a signal maximum value, if not, the second search area is searched, and it is determined whether there is a signal maximum value, if not, the next area is continuously searched until the search area where the signal maximum value is located is determined.

10. The method for verifying TB timestamp logging device time precision according to claim 6, wherein, When the azimuth and the elevation angle of the target satellite are obtained according to the longitude and latitude information of the place where the GPS antenna is located, the following steps are included: The longitude of the target satellite and the longitude and latitude of the place where the GPS antenna is located are obtained, and the azimuth and the elevation angle of the target satellite are obtained according to the obtained information, specifically as shown in formula 1 and formula 2: （1）； （2）； wherein is the longitude of the target satellite, is the longitude of the location where the GPS antenna is located, is the latitude of the location where the GPS antenna is located.

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