A Single Pulse Phase Detection Method Based on Parabolic Fitting

Abstract

The invention provides a single-pulse phase detection method based on parabola fitting. Measure the pulse mark and channel corresponding to the intermediate frequency of the main antenna of the interferometer, align the intermediate frequency of the main antenna to be tested with the pulse mark output by digital channelization, and divide the input into four phases, using two 128-point serial complex numbers FFT, to complete the 512-point FFT operation; according to the channel number where the intermediate frequency is located, find the search range of the FFT maximum value, and then find the corresponding maximum value and left and right sub-maximum values ​​and their corresponding serial numbers within the search range; for the maximum value and left and right Fit the second maximum value to obtain the offset Delta; do a single-point DFT on two points near Delta, and obtain the second fitting value Deltb; use the second fitting result Deltb to correspond to the 4 antennas Perform 512-point single-point DFT calculation on the intermediate frequency; perform arctangent calculation on the four-way single-point DFT calculation results to obtain the phase of the four-way intermediate frequency, and obtain three phase differences according to the baseline relationship. Find the frequency value.

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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