A gnss single station displacement monitoring method
A displacement monitoring and single-station technology, applied in the field of measurement, can solve problems such as long initialization time, increased application cost, complex data processing process, etc., and achieve the effect of simple processing method
Active Publication Date: 2021-09-21
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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Problems solved by technology
[0009] The purpose of the present invention is to overcome the existing GNSS single-point positioning accuracy existing in the prior art at the meter level, which cannot meet the needs of work such as surveying and setting out; RTK accuracy is at the centimeter level, but at least one base station receiver and at least one base station receiver are required. A rover receiver needs to carry out a series of base station setting, calibration and other preparatory work before it can measure, so the application cost is increased and the work efficiency is low; the PPP accuracy is at the centimeter level, but it needs to receive precise ephemeris and is subject to many errors Influenced by various factors, the data processing process becomes relatively complicated, the fast fixation of ambiguity has not been well resolved, and the above-mentioned shortcomings of long initialization time provide a GNSS single-station displacement monitoring method
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[0055] Such as Figure 1-3 Shown, a kind of GNSS single-station displacement monitoring method based on U.S. GPS of the present invention comprises the following steps:
[0056] Step 1. Set up a GNSS receiver at point A, start the receiver for a few seconds of short-term observation, and the phase observation between point A and the observation satellite s can be expressed as:
[0057]
[0058] in, is the geometric distance from satellite s to point A, λ is the wavelength, is the electron content, is the tropospheric delay, is the radial component of the track error, dt A is the receiver clock error, is the integer ambiguity, ξ is the measurement noise and unmodeled error (in weeks);
[0059] Similarly, the phase observation equation between point A and the reference satellite r (the altitude angle of the reference satellite r is greater than the altitude angle of the observation satellite s) is:
[0060]
[0061] Step 2. Calculate the difference between the ...
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The invention discloses a GNSS single-station displacement monitoring method, which is suitable for using a single GNSS receiver to measure the relative positions of two points with relatively short spatial distances in a short time. Based on the strong correlation of tropospheric delay and other errors in a short period of time and the characteristics of fixed ambiguity when there is no cycle slip, a GNSS single-station displacement monitoring technology is proposed to study the processing of GNSS single-station data time series information, by weakening or Eliminate space-time correlation errors in observations, calculate the accurate baseline vector of single receiver displacement, and quickly measure the relative positional relationship between two points. The technology of the invention does not require base stations and communication equipment, does not rely on precise ephemeris, can achieve centimeter-level positioning accuracy by using a single receiver, has a simple processing method, saves equipment purchase costs and improves measurement production efficiency.
Description
technical field [0001] The invention relates to the technical field of measurement, in particular to a GNSS (Global Navigation Satellite System, Global Navigation Satellite System) single-station displacement monitoring method. Background technique [0002] In recent years, with the continuous development and progress of GNSS receiver performance and calculation technology, GNSS precise positioning methods have made a series of progress, and their application fields have also been greatly expanded. GNSS measurement technology can be roughly divided into two categories: static measurement and dynamic measurement. [0003] Static measurement requires long observation time and many synchronous observation receivers. Data processing requires special software for calculation and adjustment before it can be applied to work. It is mainly used in the field of high-precision control measurement. [0004] The observation time of dynamic measurement is short, and the measurement result...
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IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 周适周乐韬段太生郭平王靠省刘立正晏勇
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD