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Data compensation system and method for multi-channel frequency conversion of solar radio observation system

An observation system and solar radio technology, applied in the field of data compensation, can solve the problems of receiver left and right rotation signal error, affecting the accuracy of polarization characteristic parameter measurement, receiver error, etc., so as to reduce non-uniform errors and improve measurement accuracy. performance, ensuring accuracy

Inactive Publication Date: 2018-11-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inconsistency of the amplitude-frequency characteristics and phase-frequency characteristics of each channel, there is a large error in the left-right rotation signal output by the receiver, and some of them will cause researchers to have completely different results.
These errors can be reduced by screening the component parameters of the frequency conversion circuit and modifying the circuit design, but it is also difficult to completely overcome the errors to achieve the ideal consistency between channels, and the cost will increase exponentially
[0008] To sum up, for the asymmetry of the frequency conversion circuit in the prior art, for the signal in the process of high-frequency bandwidth processing, the amplitude-frequency characteristics and phase-frequency characteristics of different frequency points of each channel are different, and the There are also inconsistencies in the amplitude-frequency characteristics and phase-frequency characteristics, which will cause a large error in the receiver, especially the channel difference affects the left-handed and right-handed signal size changes of the solar radio circular polarization synthesis output, and affects the measurement of polarization characteristic parameters The accuracy of the problem, there is still no effective solution

Method used

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  • Data compensation system and method for multi-channel frequency conversion of solar radio observation system
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  • Data compensation system and method for multi-channel frequency conversion of solar radio observation system

Examples

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Effect test

Embodiment 1

[0057] In a typical implementation of the present application, such as image 3 As shown, an FPGA-based solar radio observation system multi-channel frequency conversion data compensation system is provided, and the system includes a frequency conversion card, an ADC converter, a computer and an FPGA.

[0058] The ADC converter is connected with the frequency conversion card, and is configured to: receive the data of each channel of the frequency conversion card, convert it into digital data, and upload it to the FPG.

[0059] The FPGA is configured to: respectively perform FFT operation on the digital data of each channel to obtain the frequency domain data of each channel, and upload it to the computer; receive the correction coefficient issued by the computer, and perform an FFT operation on each frequency point of each channel The data is corrected.

[0060] The computer is configured to measure the error of the amplitude-frequency characteristic and the phase-frequency c...

Embodiment 2

[0066] Another typical implementation of the present application, such as Figure 4 As shown, a data compensation method for multi-channel frequency conversion of a solar radio observation system is provided, and the method includes the following steps:

[0067] Step 1: The ADC converter receives the data of each channel of the frequency conversion card and converts it into digital data.

[0068] Step 2: FPGS performs FFT operation on the digital data of each channel to obtain the frequency domain data of each channel.

[0069] The FFT operation is performed on the FPGA inside the board to transform the time-domain signal into a frequency-domain signal.

[0070] Step 3: Measure the error of the amplitude-frequency characteristics and phase-frequency characteristics between the channels of the frequency conversion card; calculate the correction coefficient of each frequency point.

[0071] The measuring method of the error of amplitude-frequency characteristic and phase-frequ...

Embodiment 3

[0090] A performance test example of the multi-channel frequency conversion data compensation method for the solar radio observation system proposed by the present invention is listed below.

[0091] After the AD conversion in the acquisition board, the FFT operation is performed and converted into frequency domain data. It is necessary to perform a circular polarization synthesis operation on each frequency point. The polarization synthesis principle is as follows: Figure 7 shown. The circularly polarized wave can be generated by the synthesis of two orthogonal components with a phase difference of 90 degrees. According to the rotation direction of the vector endpoints, the circularly polarized signal can be left-handed or right-handed. That is, the complex number of channel A plus the complex number of channel B multiplied by 90 is the left polarized output; similarly, the complex number of channel B plus the complex number of channel A multiplied by 90 is the right polariz...

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Abstract

The invention discloses an FPGA-based data compensation system and method for multi-channel frequency conversion of a solar radio observation system. Data of all channels of a frequency conversion card are received and the data are transformed into digital data; FFT operation is carried out on the digital data of each channel to obtain frequency domain data of each channel; errors of amplitude frequency characteristics and phase frequency characteristics among all channels of the frequency conversion card are measured, and a correction coefficient of each frequency point is calculated; and with the correction coefficients, all frequency point data of each channel are corrected. According to the invention, the differences of amplitude frequency characteristics and phase frequency characteristics of all channels of the mixer are measured and the FPGA compensates the amplitude frequency characteristics and phase frequency characteristics of all frequency points, so that non-uniform errorsof the amplitude frequency characteristics and phase frequency characteristics of all channels are reduced; the amplitude frequency characteristics of all frequency points are compensated to be an ideal consistent curve at the computer; and the measurement accuracy of the solar radio observation system is improved.

Description

technical field [0001] The invention relates to the field of data compensation, in particular to a multi-channel frequency conversion data compensation system and method for an FPGA-based solar radio observation system. Background technique [0002] The wavelength of solar radio radiation is usually in the decimeter - decimeter band (frequency MHz ~ GHz). The solar radio radiation in the decimeter-decameter wave band is characterized by a high dynamic range, and the signal will burst out randomly with solar activities, and has rich morphological manifestations on the spectrum. The relevant signals all originate from high-energy electrons accelerated by solar activities. The radiation mechanisms include plasma radiation, bremsstrahlung, gyrotron, and maser radiation, which are related to the flare-reconnection or coronal mass ejection-shock wave process. A large number of observatories have been built at home and abroad to observe solar radio, figure 1 Statistics of some lo...

Claims

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Application Information

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IPC IPC(8): G01R29/08
CPCG01R29/0857G01R29/0892
Inventor 杜清府李昕程仁君陈昌硕张巧曼张军蕊冯仕伟严发宝陈耀
Owner SHANDONG UNIV
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