Single-pulse phase discrimination method based on parabola fitting

Abstract

The invention provides a single-pulse phase discrimination method based on parabola fitting. The single-phase phase discrimination method comprises the steps of measuring a pulse label and located channel of an intermediate frequency corresponding to a main antenna of an interferometer, performing matching delay alignment on the intermediate frequency of the main antenna of the interferometer to be tested and a pulse label outputted by digital channelization, the input is performed in a four-phase manner, and a 512 point FFT operation is completed by using two paths of 128 point series complexnumber FFT; solving a search range of an FFT maximum value according to a channel number of the intermediate frequency, solving a maximum value corresponding to the FFT, left and right secondary maximum values and corresponding serial numbers thereof within the search range; performing fitting on the maximum value and the left and right secondary maximum values to solve the offset Delta; performing single-point DFT on two points near the offset Delta, and solving a secondary fitted value Deltb; performing a 512 point single-point DFT operation on the intermediate frequencies corresponding tofour antennas by using the secondary fitting result Deltb; and carrying out an anti-tangent operation on a four-path single-point DFT operation result to obtain the phase of the intermediate frequencies of the four paths, obtaining three phase differences according to baseline relation, and meanwhile, solving a frequency value according to the fitted value Deltb, the maximum value serial number and the sampling rate.

Description

technical field [0001] The invention relates to an electronic reconnaissance technology, in particular to a single-pulse phase detection method based on parabola fitting. Background technique [0002] In modern electronic warfare countermeasures, electronic reconnaissance and positioning are undoubtedly the most basic and important. The passive positioning method adopted by it only receives signals from unknown target radiation sources to determine the enemy's true position, and gets rid of the enemy's The party's reconnaissance of you shows excellent concealment, which improves the survival probability of the reconnaissance system in a real information warfare environment. Angle measurement or time difference measurement is a traditional method for passive positioning of radiation sources. Using time difference positioning requires multiple stations, and the cost is relatively high. Moreover, the large amount of data between stations needs to be transmitted synchronously, w...

AI Technical Summary

Problems solved by technology

The traditional phase difference measurement method has always been difficult to take into account the phase detection accuracy and real-time performance, and it does not have good adaptability to the situation of high pulse density, multi-signal, and complex electromagnetic environment

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