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An improved synchronous disturbance stochastic approximation algorithm for atmospheric parameters

An atmospheric parameter, random approximation technology, applied in the field of GPS meteorology, can solve the problems of difficult design of tangent linear operator and adjoint operator, increase algorithm complexity, etc., to improve the global search ability, avoid tangent linear operator and adjoint Operators, the effect of improving efficiency and feasibility

Active Publication Date: 2019-01-04
HEFEI UNIV OF TECH
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Problems solved by technology

This process greatly increases the complexity of the algorithm, and the design of the tangent linear operator and the adjoint operator is a difficult point

Method used

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  • An improved synchronous disturbance stochastic approximation algorithm for atmospheric parameters
  • An improved synchronous disturbance stochastic approximation algorithm for atmospheric parameters
  • An improved synchronous disturbance stochastic approximation algorithm for atmospheric parameters

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Embodiment Construction

[0049] In this embodiment, the principle of occultation data assimilation is as follows: figure 2 As shown, the carrier signals of the two bands L1 and L2 continuously transmitted by the GPS navigation satellite pass through the atmosphere and are delayed and bent, and then received by the satellite receiver on the low-orbit satellite. The signal receiving end can calculate the transmission delay and bending angle profile of the carrier signal caused by the neutral atmosphere, and further obtain the atmospheric refractive index profile. By assimilating the occultation data such as bending angle and atmospheric refractivity into the numerical weather prediction model, the parameter vector of atmospheric parameters can be solved. Such as image 3 As shown, a method of solving atmospheric parameters of an improved synchronous disturbance random approximation algorithm is carried out as follows:

[0050] Step 1. The current operational system used in numerical weather predictio...

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Abstract

The invention discloses a method for solving atmospheric parameters of an improved synchronous disturbance random approximation algorithm, which is characterized in that the method is carried out according to the following steps: firstly, a cost function for solving atmospheric parameters assimilated by occultation data is established; then the synchronous perturbation stochastic approximation algorithm is used to solve the optimal solution of the cost function, and the approximate gradient of the cost function is used to guide the search process of the algorithm, thus avoiding the complex cost function gradient solution. In the process of solving the problem, the global searching ability of the algorithm can be improved by mesh partition of the search space. At the same time, the adaptiveimprovement of the initial step size can improve the convergence rate of the algorithm. The invention simplifies the solution of the cost function in the occultation data assimilation technology, improves the efficiency and feasibility of solving the atmospheric parameter vector, and has a broad application prospect.

Description

technical field [0001] The invention belongs to the field of GPS meteorology, in particular to a method for solving atmospheric parameters of an improved synchronous disturbance random approximation algorithm. Background technique [0002] Radio occultation observation technology is an important subject of GPS meteorology, which uses signal delay and bending to analyze atmospheric parameters. GPS navigation satellites continuously transmit carrier signals in two bands, L1 and L2. When the carrier signal passes through the atmosphere, it will be delayed and bent, and it will be picked up by the satellite receiver on the low-orbit satellite. At the signal receiving end, the linear combination of the carrier signals of the two bands can eliminate the influence of the ionosphere, and calculate the signal transmission delay and signal bending angle profile caused by the neutral atmosphere; further, the atmospheric refraction can be obtained through Abel integral transformation ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/11G06F17/16G01W1/00
CPCG06F17/11G06F17/16G01W1/00Y02A90/10
Inventor 杜华争田杰洪韵晴夏娜陈国烨许保殿
Owner HEFEI UNIV OF TECH
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