30 results about "Ionospheric electron density" patented technology

The invention belongs to the field of signal and information processing, and specifically relates to an ionospheric electron density inversion method, system, and device based on the CLEAN algorithm, aiming at solving the large amount of calculation of incoherent scattered plasma spectral lines and the insufficient accuracy of electron density profile inversion The problem. The method of this system includes: obtaining the IQ digital signal; extracting and deleting the signal part collected during the pulse transmission in the IQ digital signal, and constructing a two-dimensional matrix; decoding and calculating the signal power spectrum of each range gate height through the frequency domain FFT algorithm; iteratively obtaining each distance Accumulate the power spectrum data of the gate height, and denoise through the system frequency response function; deconvolute the denoised power spectrum data based on the CLEAN algorithm; obtain the plasma spectral line of the entire height profile by the spline interpolation method, and The ionospheric electron density profile was obtained by fitting the Langmuir dispersion relation. The invention improves the real-time calculation of plasma spectral lines and the precision of electronic density profile inversion.

The invention discloses an integrated real-time correction system for atmosphere convection layer and ionized layer radio wave refraction errors, which comprises a microwave radiometer, a single-station GPS (Global Positioning System) and an integrated real-time correction unit, wherein the microwave radiometer is used for detecting a convection layer refractivity profile; the single-station GPS is used for detecting an ionized layer electron density profile in real time; and the integrated real-time correction unit is used for calculating radio wave refraction error corrections in real time by adopting a ray tracing method based on the convection layer refractivity profile, the ionized layer electron density profile and the apparent distance and the apparent elevation angle parameter of a detection target, wherein the radio wave refraction error corrections comprise a distance error correction, an elevation angle error correction and a speed error correction. The integrated real-time correction device for atmosphere convection layer and ionized layer radio wave refraction errors overcomes the defect that the parameters of a convection layer and an ionized layer cannot be simultaneously detected by adopting the traditional method, realizes the real-time correction of the radio wave refraction errors of the convection layer and the ionized layer, has the advantages of high accuracy, good real-time performance, unattended operation, strong mobility, low cost, simplicity in operation and the like, and provides a technical support for improving the accuracy of systems for aerial survey, deep-space survey, ballistic trajectory measurement and the like in China.

The invention discloses an ionospheric tomography technology based on multi-scale subdivision and an ionospheric delay correction method. The three-dimensional space of the regional ionosphere is subdivided according to different "pixel" scales, thereby obtaining multiple different The single-scale ionospheric tomography model, the unknown variables of these models are uniformly solved, and according to different weight factors, finally weighted to obtain the solution of the multi-scale tomography model, the ionospheric electron density distribution in the region is reconstructed, and the regional ionospheric electron density distribution is obtained. Ionospheric delay. The ionospheric space activity law reconstructed by the invention has a high degree of fitting, strong timeliness, and is convenient to use; the regional ionospheric delay amount calculation result obtained according to the invention has high accuracy, which expands the application range of CORS measurement results. After analyzing the application results of a large number of engineering examples, the ionospheric electron density distribution reconstructed by the invention is smoother and more reasonable than the traditional single-scale ionospheric tomography model, and the accuracy of ionospheric delay correction is increased by 30% on average.

The present invention provides a GNSS occultation ionospheric residual correction method and system based on ionospheric electron density. The method includes: preprocessing GNSS occultation raw observation data and ionospheric vTEC maps data, and obtaining GNSS occultation geometric data and ionospheric data; based on GNSS occultation geometric data, ionospheric data and three-dimensional NeUoG ionospheric model, calculate the electron density profile of the ionospheric puncture point on the "incoming ray" and "outgoing ray" sides; based on GNSS occultation geometric data and the electron density profile to calculate the curved angle ionospheric residual profile. The GNSS occultation ionospheric residual correction method and system of the present invention can be used in the inversion of atmospheric parameters of a single GNSS occultation event to weaken the influence of ionospheric residuals, thereby obtaining a higher-precision GNSS occultation bending angle profile, Efficient and reliable.

The invention discloses an ionospheric occultation inversion method based on double-parameter mixed regularization, which is characterized in that it includes: (1) preprocessing satellite observation data to obtain observation values; (2) using GPS precise ephemeris Interpolate the satellite coordinates at the desired moment; (3) utilize GPS dual-frequency observations to calculate the TEC on the propagation path; (4) double-parameter hybrid regularization method to invert ionospheric electron density; the present invention improves the calculation of ionospheric electron density. The accuracy of the density can greatly reduce the influence of measurement errors, thereby improving the inversion accuracy of the electron density.

The invention discloses a GNSS ionosphere delayed three-dimensional modeling method suitable for a global area. The GNSS ionosphere delayed three-dimensional modeling method comprises the steps of acquiring an empirical orthogonal function which is used for representing vertical distribution of ionosphere electrons, establishing an ionosphere model based on a spheric harmonics function and the empirical orthogonal function by means of an ionosphere TEC observation amount which has been accurately estimated, and constructing an accurate three-dimensional modeling method which is suitable for ionosphere delay of the global area. Compared with an existing method, the GNSS ionosphere delayed three-dimensional modeling method is advantageous in that the empirical orthogonal function is used for representing vertical density distribution of the ionosphere electrons; not only is limitation of an ionosphere delay two-dimensional model overcome, but also change information of ionosphere large-scale structure (such as equator abnormity, midlatitude trough and different ionosphere disturbance) can be effectively monitored; and furthermore the GNSS ionosphere delayed three-dimensional modeling method has important scientific meaning and application value in monitoring and researching different scale inhomogeneities, ionosphere environment, ionosphere temporal and spatial variation and monitoring the ionosphere in a global range.

The invention discloses a detection method for the electron density of an ionization layer based on radar echoes. The method is realized by the following steps that (1) original data is collected and stored; (2) non-coherent scattering echoes are extracted from the ionization layer; and (3) the electron density of the ionization layer is calculated. The disclosed detection method has great significance in radar wave environment adaptation and space environment monitoring and early-warning domestically; and compared with a present special-purposed electron density detection method for the ionization layer, the method of the invention is simple and economic. The method of the invention is also high in compatibility and transplantability, and is suitable for most space monitoring radars, and the radars need only to provide signal interfaces of original echo signals, emission pulse signals, main pulse signals and sampling clock and the like.