CN112650046B

CN112650046B - Logging GPS time service method and system

Info

Publication number: CN112650046B
Application number: CN201910960278.6A
Authority: CN
Inventors: 贺跃宏; 金晓雷
Original assignee: China Petroleum and Chemical Corp; Sinopec Geophysical Research Institute
Current assignee: China Petroleum and Chemical Corp; Sinopec Geophysical Research Institute
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2022-05-13
Anticipated expiration: 2039-10-10
Also published as: CN112650046A

Abstract

A logging GPS time service method and system are disclosed. The method can comprise the following steps: acquiring initial GPS time according to the ignition command; separating time classes for initial GPS time; converting aiming at the time grade to obtain UTC time; and writing the UTC time into SEG-Y data and outputting. The invention provides accurate time service through the GPS, receives the PPS time of the satellite, improves the accuracy to 10ns, effectively solves the problems that a logging instrument has no synchronous system and the synchronous accuracy is too low, and improves the fracturing detection and exploration accuracy.

Description

Logging GPS time service method and system

Technical Field

The invention relates to the field of seismic exploration, in particular to a logging GPS time service method and system.

Background

When the microseism monitoring data is collected, the ground instrument WAVELAB system uses the clock of a notebook computer as a synchronous signal, the precision is low, the influence of the temperature and the quality of the notebook computer is great, and a large system synchronous time difference exists when a plurality of instruments are jointly collected. Therefore, it is necessary to develop a method and system for logging GPS time service.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention provides a logging GPS time service method and system, which can provide accurate time service through a GPS, receive the PPS time of a satellite, improve the precision to 10ns, effectively solve the problems that a logging instrument has no synchronous system and the synchronous precision is too low, and improve the precision of fracturing detection and exploration.

According to one aspect of the invention, a logging GPS time service method is provided. The method may include: acquiring initial GPS time according to the ignition command; separating time classes for the initial GPS time; converting the time grade to obtain UTC time; and writing the UTC time into SEG-Y data and outputting.

Preferably, separating the time classes for the initial GPS time comprises: for the initial GPS time, de-encode the $ GPGGA byte, separate the time level.

Preferably, the method further comprises the following steps: for the initial GPS time, the $ GPGGA byte is de-encoded for the NMEA-0183 protocol.

Preferably, the time scale includes hour, minute, second, nanosecond.

Preferably, the UTC time is written into 167-172 bytes of SEG-Y data.

According to another aspect of the invention, a logging GPS time service system is provided, which is characterized by comprising: the GPS system acquires initial GPS time; the seismic data acquisition equipment is used for acquiring and storing SEG-Y data; a clock board performing the steps of: acquiring initial GPS time according to the ignition command; separating time classes for the initial GPS time; converting the time grade to obtain UTC time; and writing the UTC time into SEG-Y data and outputting the SEG-Y data to the seismic data acquisition equipment.

Preferably, the time scale includes hour, minute, second, nanosecond.

Preferably, the UTC time is written to 167-172 bytes of SEG-Y data.

The method and apparatus of the present invention have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.

FIG. 1 shows a flow chart of the steps of a logging GPS time service method according to the invention.

FIG. 2 shows a schematic diagram of a logging GPS time service system according to one embodiment of the invention.

Description of reference numerals:

1. a GPS system; 2. a clock board; 3. seismic data acquisition equipment.

Detailed Description

The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In this embodiment, the logging GPS time service method according to the present invention may include: step 101, obtaining initial GPS time according to an ignition command; step 102, separating time grades aiming at initial GPS time; step 103, converting the time grade to obtain UTC time; and 104, writing the UTC time into SEG-Y data and outputting the SEG-Y data.

In one example, separating the time classes for the initial GPS time includes: for initial GPS time, $ GPGGA bytes are de-encoded, separating time levels.

In one example, further comprising: for initial GPS time, the $ GPGGA byte is de-encoded for the NMEA-0183 protocol.

In one example, the time scale includes hours, minutes, seconds, nanoseconds.

In one example, UTC time is written to 167- "172 bytes of SEG-Y data.

Specifically, the logging GPS time service method according to the invention can comprise the following steps:

acquiring initial GPS time according to the ignition command; for the initial GPS time, decoding and encoding a $ GPGGA byte for an NMEA-0183 protocol, and separating time levels, wherein the time levels comprise time, minutes, seconds and nanoseconds; performing decimal conversion aiming at the time grade to obtain UTC time; the UTC time is written into 167 and 172 bytes of the SEG-Y data and output.

The method provides accurate time service through the GPS, receives the PPS time of the satellite, improves the accuracy to 10ns, effectively solves the problems that a logging instrument has no synchronous system and the synchronous accuracy is too low, and improves the fracturing detection and exploration accuracy.

According to an embodiment of the invention, a logging GPS time service system is provided, which is characterized by comprising: the GPS system acquires initial GPS time; the seismic data acquisition equipment is used for acquiring and storing SEG-Y data; a clock board performing the steps of: acquiring initial GPS time according to the ignition command; for the initial GPS time, decoding and encoding a $ GPGGA byte for an NMEA-0183 protocol, and separating time levels, wherein the time levels comprise time, minutes, seconds and nanoseconds; performing decimal conversion aiming at the time grade to obtain UTC time; and writing the UTC time into 167-172 bytes of the SEG-Y data and outputting the UTC time to the seismic data acquisition equipment.

When the plurality of seismic data acquisition devices comprise the logging GPS time service system, the GPS time can be acquired simultaneously, synchronization is carried out according to the GPS time, and the synchronization precision is improved.

The system provides accurate time service through the GPS, receives the PPS time of the satellite, improves the precision to 10ns, effectively solves the problems that a logging instrument has no synchronous system and the synchronous precision is too low, and improves the precision of fracturing detection and exploration.

Application examples

To facilitate understanding of the solution of the embodiments of the present invention and the effects thereof, a specific application example is given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.

The logging GPS time service system comprises: the GPS system 1 acquires initial GPS time; the seismic data acquisition equipment 3 is used for acquiring and storing SEG-Y data; the clock board 2, carry out the following steps: acquiring initial GPS time according to the ignition command; for the initial GPS time, decoding a protocol NMEA-0183 for $ GPGGA bytes, and separating time levels, wherein the time levels comprise time, minute, second and nanosecond; performing decimal conversion aiming at the time grade to obtain UTC time; the UTC time is written into 167-172 bytes of the SEG-Y data and output to the seismic data acquisition equipment 3.

In conclusion, the invention provides accurate time service through the GPS, receives the PPS time of the satellite, improves the precision to 10ns, effectively solves the problems that a logging instrument has no synchronous system and the synchronous precision is too low, and improves the precision of fracturing detection and exploration.

It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A logging GPS time service method is characterized by comprising the following steps:

acquiring initial GPS time according to the ignition command;

separating a time scale for the initial GPS time;

converting the time grade to obtain UTC time;

writing the UTC time into SEG-Y data and outputting;

wherein separating the temporal levels for the initial GPS time comprises:

for the initial GPS time, de-encode the $ GPGGA byte, separate the time level.

2. The well logging GPS time service method according to claim 1, further comprising: for the initial GPS time, the $ GPGGA byte is de-encoded for the NMEA-0183 protocol.

3. The well logging GPS time service method of claim 1, wherein said time scale includes time, minutes, seconds, nanoseconds.

4. The method as claimed in claim 1, wherein the UTC time is written into 167-172 bytes of SEG-Y data.

5. A logging GPS time service system is characterized by comprising:

the GPS system acquires initial GPS time;

the seismic data acquisition equipment is used for acquiring and storing SEG-Y data;

a clock board performing the steps of:

acquiring initial GPS time according to the ignition command;

separating time classes for the initial GPS time;

converting the time grade to obtain UTC time;

writing the UTC time into SEG-Y data and outputting the SEG-Y data to the seismic data acquisition equipment;

wherein separating the time class for the initial GPS time comprises:

for the initial GPS time, de-encode the $ GPGGA byte, separate the time level.

6. The well logging GPS time service system of claim 5, further comprising: for the initial GPS time, the $ GPGGA byte is de-encoded for the NMEA-0183 protocol.

7. The well logging GPS time service system of claim 5, wherein said time scale includes time, minutes, seconds, nanoseconds.

8. The logging GPS time service system of claim 5, wherein the UTC time is written into 167-172 bytes of SEG-Y data.