38results about How to "Increase inversion speed" patented technology

The invention discloses a method for increasing the inversion speed of concentration of a greenhouse-gas vertical column. The method increases the inversion speed of concentration of the greenhouse-gas vertical column through two ways of increasing a spectrum modeling speed and a continuous calculation speed for the concentration of vertical column. In the spectrum modeling process, the modeling speed is increased by ignoring the influence of some weak interference factors and discretized radiative transfer equations. In the continuous inversion process of concentration of the greenhouse-gas vertical column, a table look-up method is adopted to increase the calculation speed of the concentration of the greenhouse-gas vertical column: the solar normalized radial brightness and weighting function of all possible scenes are simulated firstly, correction factors are counted when all spectra adopt the value of simulation of one specific scene for inversion fitting, and a correction chart is made; during follow-up data processing, the measurement spectra of all scenes can adopt the value of simulation of the specific scene for fitting, only the fitting result multiplies by corresponding correction factors in the chart, and the measurement spectra of all scenes do not need modeling.

The invention discloses a microearthquake inversion algorithm which is a combined inversion positioning method based on grid search and Newton iteration. The algorithm is roughly divided into two parts, according to the first part, grid division is performed in the area where a microearthquake event happens, and the rough position where the microearthquake event happens is obtained through the grid search method; the second part is the Newton method, and the initial iteration value during Newton method inversion is the result of the grid search method in the first part. The defect that the Newton iteration method excessively depends on the initial iteration value is overcome, the number of iterations is reduced, and a target function can be well converged close to a theoretical true value finally.

The invention discloses a fast microwave imaging method. In each iteration of the DBIM algorithm, the inversion speed is improved by calling this efficient direct problem solver to calculate the direct problem. At the same time, in order to make the whole inversion algorithm perform iterative inversion stably, the truncated singular value decomposition (TSVD) technique is adopted, which avoids a large number of numerical tests to determine the regularization term. In order to further reduce the amount of calculation, in the cost function of the inversion algorithm, the incident field is used instead of the total field. Therefore, the invention can perform inversion quickly and stably, ensuring the image inversion speed and quality.

The invention relates to a method for accurately detecting the earth gravity field, in particular to a method which includes: based on the load error analysis theory, accurately building the distance error between satellites of a K wave band distance meter, the satellite orbit position error and the orbital velocity error of a global positioning system (GPS) receiver and an error model in which accumulative geoid accuracy is affected by the nonconservative force error coalition of a satellite-bone accelerometer, and further accurately and rapidly inversing the earth gravity field. The method is high in inversion accuracy of the earth gravity field, simple in satellite gravity inversion process, low in performance requirements of a computer and definite in physical meanings of a satellite observation equation, and effectively improves inversion speed on the premise of ensuring calculation accuracy. The satellite gravity inversion method based on the load error analysis theory is an effective method for calculating the earth gravity field which is high in accuracy and spatial resolution.

The invention discloses a fast two-dimensional density inversion method based on a physical property function. The method comprises the following steps of: S1, collecting gravity data by field actual measurement; S2, determining the physical property function order of an inversion area according to the gravity data or the existing data; S3, transversely subdividing the inversion area in the underground half space according to the distribution of the physical property function; S4, establishing a corresponding kernel function matrix; and S5, performing forward modeling on the parameter inversion result, and checking the inversion fitting degree. The fast two-dimensional density inversion method introduces the physical property function, reduces the memory occupation during operation and improves the operation speed; a construction mode of an underground half-space density model when a physical property function is introduced; the inversion speed is improved; and less memory space is occupied in the calculation process.

The invention relates to a gravity satellite formation orbital stability optimization design and an earth gravity field precision inversion method on the basis of disturbing inter-satellite distance principle, in particular to an orbital stability optimization design method for a four-satellite system (FSS). In order to guarantee the stability of the four-satellite system, the quantity of satellite orbits is optimally designed, orbital semi-major axes, orbital eccentricities, orbital inclinations and right ascensions of ascending nodes keep unchanged, the difference of arguments of perigees each pair of satellites and the difference of mean anomalies of the pair of satellites are 180 degrees respectively, an initial argument of perigee of each satellite is arranged at the equator, an initial mean anomaly of each satellite is arranged at a pole, and the ratio of the semi-major axis of each elliptical orbit of the four-satellite system to a semi-minor axis of the elliptical orbit of the four-satellite system is 2:1. The gravity satellite formation orbital stability optimization design and the earth gravity field precision inversion method have the advantages that an earth gravity field is precisely and quickly inverted on the basis of a disturbing inter-satellite distance process; and the orbits are high in stability owing to the method, the earth gravity field computation precision is effectively improved, the gravity field inversion speed is increased to a great extent, and requirements on the performance of a computer are low.