A pairing device for secondary radar channel signals

Abstract

The invention discloses a pairing device for secondary radar channel signals. The signal connection module connects the intermediate frequency signals of Σ, Δ, and Ω channels respectively, performs sampling and analog-to-digital conversion, and obtains discrete digital signals; the orthogonal decomposition module performs orthogonal decomposition on discrete digital signals to generate three channels of zero intermediate frequency I, Q signal; the sequence extraction module calculates the amplitude sequence and phase sequence of the three channels; the sequence comparison module calculates the amplitude sequence change value and the phase sequence change value respectively for the three channels, and judges whether it is greater than the amplitude change threshold or whether it is greater than Phase change threshold value, when any one is greater than, mark the first eigenvalue for the corresponding channel, otherwise mark the second eigenvalue; when the signal gating module has marked the first eigenvalue in the three channels, cut off the three channels When the video signal is marked with the second eigenvalue, restore the video signal input. The invention can ensure that the sources of the video signals of the Σ, Δ and Ω channels are the same.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a secondary radar channel signal pairing device. Background technique [0002] The Secondary Surveillance Radar (SSR) realizes the positioning of the target by processing the response signal of the flying target in the air, and provides the airspace traffic situation information for the controller. [0003] The principle block diagram of the secondary radar signal processing system is as follows: figure 1 As shown in the figure, the antenna 101 has three signal channels, which are respectively Σ, Δ, and Ω channels. The secondary radar receives the secondary radar echo signal of the airborne target through its antenna 101, and the signal passes through the mixer 102 and the filter. 103. After processing by the intermediate frequency logarithmic amplifier 104, the intermediate frequency signals of the Σ, Δ, and Ω channels are obtained. The intermediate frequency si...

AI Technical Summary

Problems solved by technology

The superposition of interference signals will cause the input signals of the Σ, Δ, and Ω channels to be different, and the RSLS processing unit 106, the OBA calculation unit 107 and the SSR decoding unit 108 process according to the relative relationship between the amplitudes of the video signals of the Σ, Δ, and Ω channels. Therefore, when there is multipath, same-frequency signal interference or multi-target signal superposition caused by environmental reflections, the signal amplitudes of the three channels deviate from the real situation, resulting in RSLS processing unit 106, OBA calculation unit 107 and SSR decoding Unit 108 handles exceptions

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