A digital signal amplitude and phase calibration method and system

Abstract

The invention provides a digital signal amplitude and phase calibration method and a digital signal amplitude and phase calibration system. First, mixing and low-pass filtering of acquired A / D data are performed; then, a calibration value sequence group is calculated, and the calibration value sequence group is filtered smoothly; and finally, the Nth value of each calibration value sequence after smooth filtering is taken, the result of smooth filtering is searched adaptively, the final calibration factor meeting the requirements is found out, the calibration factor is sent to a single chip microcomputer, and when calibration is needed, the single chip microcomputer sends an array to a calibration module of an FPGA, and the calibration module calibrates the amplitude and phase of a digital signal. The obtained calibration value can contain the amplitude error and phase error of an analog channel more accurately. In addition, as data is stored in the single chip microcomputer, the amount of stored and transmitted data is reduced greatly.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a digital signal amplitude and phase calibration method and system. Background technique [0002] The satellite navigation system has the ability of large-scale, all-weather, all-day high-precision positioning, speed measurement and providing timing services, and has been widely used in various fields of national defense and national economy. Competition in the field of satellite navigation is bound to intensify as civilian and military operations become more dependent on satellite navigation systems. Due to the reason of the analog channel itself, the same signal will have different amplitude and phase after passing through different analog channels, which will bring great inconvenience to the subsequent digital signal processing and greatly reduce the digital signal The results of the processing do not reflect the actual situation. [0003] In order to effecti...

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Problems solved by technology

[0004] However, under the condition of very high precision, it is necessary to strictly calibrate the channel with high precision. However, the traditional method not only consumes a lot of storage in the calibration process, but also the calibration effect cannot meet the high precision requirements.

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