Method for obtaining ASF(TOA), combined ASF(TD) and ASF(TOA) measurement

Abstract

The method includes steps: first, measuring obtains ASF(TOA) of single long wave station, and data of ASF(TD) between the station and other stations so as to obtain correcting data of ASF(TOA) for all stations; since ASF(TOA) value in each wave path is a constant in sea area (far apart from coastal effect affected zone), thus, ASF(TOA) measured value of each point on sea route is applicable to entire sea area of wave path except coastal effect affected zone so as to obtain correcting data of ASF(TOA) in sector sea area surrounded by two radials between station and starting point / ending point;further, obtaining correcting data of ASF(TOA) of the said sectors covered by each station. The invention can obtain ASF (TOA) data of more areas and more stations from ASF(TOA) measured data of single station as well as between the station and other stations so as to reduce difficulty and workload for measuring ASF(TOA) data.

Description

technical field [0001] The invention belongs to the technical field of radio wave propagation measurement, and relates to a method for measuring long-wave propagation delay correction at sea, in particular to ASF (TOA) measurement data of signals transmitted by a single long-wave station, and ASF (TD) measurement data of station chains , a method to obtain ASF(TOA) data from more stations in a larger area. Background technique [0002] Long-wave signals have outstanding advantages such as large coverage, all-weather, low cost, strong anti-interference ability, high reliability, good stability, and unlimited number of users. They are often used in radio navigation and positioning systems and timing systems, but their propagation delay and propagation path. There are large prediction errors, which limit the accuracy of long-wave navigation and positioning systems and timing systems. In order to improve the accuracy of long-wave navigation, positioning and timing systems, it i...

AI Technical Summary

Problems solved by technology

[0002] Long-wave signals have outstanding advantages such as large coverage, all-weather, low cost, strong anti-interference ability, high reliability, good stability, and unlimited number of users. They are often used in radio navigation and positioning systems and timing systems, but their propagation delay and propagation path It is related to the terrain, surface objects, atmospheric environment and other factors on the ground, and there is a large prediction error, which limits the accuracy of the long-wave navigation and positioning system and the timing system.

Images