3results about How to "Reduce conversion error" patented technology

This invention discloses a pole-to-optical cable positioning method based on distributed optical fiber sensing and topology matching, relating to the field of power communication optical cable operation and maintenance technology. The method includes: acquiring Brillouin frequency shift signals, ambient temperature, and icing thickness to perform signal denoising; calibrating the denoised signal to obtain a calibrated frequency shift signal; extracting the optical position of the optical cable at the pole's suspension point using the signal abrupt change characteristics of the suspension point and constructing a suspension point feature set; calculating a dynamic sag correction coefficient based on ambient temperature, icing thickness, and optical cable stress to convert the optical length of the optical cable to its actual geographical length; and establishing a three-dimensional mapping relationship to complete the optical cable location. This invention relies on BOTDA / BOTDR distributed optical fiber sensing equipment and OTDR equipment, and through a process logic of data acquisition, signal processing, dynamic correction, topology mapping, and self-healing update, achieves the associated positioning of poles and optical cables, solving the problem of inaccurate correspondence between the optical cable's optical position and the pole, and improving the accuracy of pole attribution.

This invention discloses a pole-to-optical cable positioning method based on distributed optical fiber sensing and topology matching, relating to the field of power communication optical cable operation and maintenance technology. The method includes: acquiring Brillouin frequency shift signals, ambient temperature, and icing thickness to perform signal denoising; calibrating the denoised signal to obtain a calibrated frequency shift signal; extracting the optical position of the optical cable at the pole's suspension point using the signal abrupt change characteristics of the suspension point and constructing a suspension point feature set; calculating a dynamic sag correction coefficient based on ambient temperature, icing thickness, and optical cable stress to convert the optical length of the optical cable to its actual geographical length; and establishing a three-dimensional mapping relationship to complete the optical cable location. This invention relies on BOTDA / BOTDR distributed optical fiber sensing equipment and OTDR equipment, and through a process logic of data acquisition, signal processing, dynamic correction, topology mapping, and self-healing update, achieves the associated positioning of poles and optical cables, solving the problem of inaccurate correspondence between the optical cable's optical position and the pole, and improving the accuracy of pole attribution.

The application discloses a method for converting user precise point positioning results into CGCS2000 coordinates, comprising the following steps: based on the precise GNSS satellite orbit and clock error products provided by IGS, performing GNSS precise point positioning data processing on a user survey station and at least three IGS survey stations respectively to obtain respective precise point positioning results; according to the precise point positioning results of the IGS survey stations at the same ephemeris and the corresponding CGCS2000 coordinates, constructing an indirect adjustment error equation to solve the conversion parameters of the conversion of the precise point positioning results into the CGCS2000 coordinate system; and based on the conversion parameters, converting the precise point positioning results of the user survey station to obtain the CGCS2000 coordinates of the user survey station. The application provides a prerequisite basis for the high-precision measurement engineering coordinate conversion of precise point positioning results, so as to enhance the usability of the precise point positioning technology in actual engineering projects.