Unifying the Nepal height system and China height system based on gravity frequency shift approach  

作　　者：K.C.Shanker Ziyu Shen Wenbin Shen 

机构地区：[1]Time and Frequency Observation Center,Department of Geophysics,School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China [2]School of Resource,Environmental Science and Engineering,Hubei University of Science and Technology,Xianning 437100,China [3]Geodetic Survey Division,Survey Department,Government of Nepal,Kathmandu,Nepal [4]State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China

出　　处：《Geodesy and Geodynamics》2025年第2期193-202,共10页大地测量与地球动力学(英文版)

基　　金：the National Natural Science Foundation of China(NSFC)(Grant Nos.42030105,42274011,42074019,41974034,42204006)。

摘　　要：Highly accurate international height reference frames with long-term stability,global consistency,and homogeneity are crucial for monitoring sea level variations,understanding climate change,managing disasters,and supporting other applications that benefit scientific research and societal well-being.Currently,there are over 100 local height reference systems worldwide.Unifying these systems is a pivotal step toward constructing international height reference frames.The method introduced in this study-the gravity frequency shift via Satellite Frequency Signal Transfer(SFST)-represents a groundbreaking relativistic geodetic approach,demonstrating its potential to surpass the constraints of conventional techniques.The advent of high-precision optical atomic clocks(OAC)with an accuracy level of 1×10^(-18) has facilitated this method's implementation.The International Association of Geodesy(IAG)has established the International Height Reference System(IHRS)and its practical realization,the International Height Reference Frame(IHRF).Our study focuses on two neighbouring height systems:the China Height System(CHS)and the Nepal Height System(NHS),separated by the Himalayas and the Xizang plateau.We aim to unify these two systems by determining the geopotential and orthometric height differences between their respective height datum stations:the Qingdao Height Datum Station(QHDS)and the Madar Height Datum Station(MHDS)using a simulation experiment with the method mentioned above.Using an OAC with an accuracy of 1×10^(-18),we identified a geopotential difference of-8.348±0.464 m^(2)s^(-2) and an orthometric height difference of 0.786±0.047 m between QHDS and MHDS.These results suggest that the introduced method could unify any two height systems with fewcentimeter-level precision,emphasizing its significance in contributing to the construction of the IHRS/IHRF with today's required precision.In summary,the SFST technique is a novel geodetic method that offers an alternative for height system unification,delivering cent

关 键 词：Vertical reference system Gravity frequency shift SFST IHRF Height system unification 

分 类 号：P223[天文地球—大地测量学与测量工程]