Pairing device for secondary radar channel signals

Abstract

The invention discloses a pairing device for secondary radar channel signals. A signal connection module is respectively connected with intermediate frequency signals of channels Sigma, Delta and Omega for sampling and analog-to-digital conversion to obtain discrete digital signals; an orthogonal decomposition module performs orthogonal decomposition on the discrete digital signals to respectively generate zero intermediate frequency I and Q signals of three channels; a sequence extraction module calculates amplitude sequences and phase sequences of the three channels; a sequence comparison module is used for respectively calculating amplitude sequence change values and phase sequence change values for the three channels, judging whether the amplitude sequence change values and the phase sequence change values are greater than an amplitude change threshold value or a phase change threshold value, marking a first characteristic value for the corresponding channel when any one is greater than the amplitude change threshold value, and otherwise, marking a second characteristic value; and a signal gating module cuts off the video signals of the three channels when the first feature values are marked on the three channels, and recovers the input of the video signals when the second feature values are marked on the three channels. According to the invention, the sources of the video signals of the Sigma, Delta and Omega 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

Images