Friend or foe identification signal code rate calculation method based on Haar transform

Abstract

The invention relates to a friend or foe identification signal code rate calculation method based on Haar transform. The method comprises the following steps: firstly sampling an intermediate frequency signal, then intercepting a burst IFF signal in real time by employing a channelization parallel detection technology, obtaining the accurate frequency of the IFF signal through an instantaneous phase difference frequency measurement technology, and therefore, calculating the optimal multi-resolution analysis scale factor of the IFF signal; performing Haar wavelet transform on the intercepted IFF signal under the optimal multi-resolution analysis scale factor to obtain a feature vector parameter of the IFF signal in a wavelet transform domain, then performing singular point domain separation and curve fitting on the feature vector parameter, and synchronously calculating a feature value of the feature vector parameter in real time; and establishing a feature vector space of a tree structure according to the feature value, and judging and calculating the accurate code rate of the IFF signal. According to the invention, the calculation amount and the calculation error of the identification friend or foe signal code rate can be effectively reduced.

Description

technical field [0001] The invention relates to the field of signal code rate calculation, in particular to a method for calculating the signal code rate of IFF based on Haar transformation. Background technique [0002] Mark XIIA IFF system is an upgraded version of Mark XII, adding Mode5 on the original basis. The Mode5 system adopts secure information format and data transmission technology, which improves the system's security, anti-interference and battlefield situation awareness capabilities, and can be used for air-to-ground, ground-to-air, air-to-air, sea-to-sea and other combat identification. At present, the military surveillance platforms of the U.S. military and NATO allies, such as E-3B AWACS, E-2C early warning aircraft, and Aegis combat systems have been equipped with Mode5 IFF systems, and the IFO systems of air, ground, and surface combat platforms are also being upgraded to Mode5 system [0003] One of the typical features of the Mode5 system is that all ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for calculating the code rate of the identification friend or foe signal based on Haar transform, to solve the problem that the existing calculation method for the code rate of the identification friend or foe signal has a large amount of calculation, and when the signal-to-noise ratio is unstable, the code rate The calculation error fluctuation is relatively large

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