Characteristics of the signals detection of imitoprotection modes identification system

The main purpose military identification systems in the control of airspace and air traffic control is guaranteed recognition of friendly sites. When organizing suppression means identification system Mark XIIA, definition used in the system identification mode can be carried out by interception of signals circulating. Requires an assessment of the efficiency of detection interrogations at the organization suppression defendants. In situations of armed conflict may be used by the adversary imitoprotection identification mode.

Analysis interrogations shows that they are composed of a support group consisting of several pulses of the preamble and the pulse sidelobe suppression, and pulse information group. Since the direction of arrival of AP is unknown a priori and cryptographic protection significantly complicates the decryption information group, means for electronic intelligence is important the fact of radiation in-terrogations imitoprotection mode, which is determined by analysis of the reference group. Sidelobe suppression pulse thus may be included in or excluded from processing it. Preamble detection or support group for further identification interrogations reduced to detec-tion based on the sign of the test statistic counts modulating function nonparametric sign detector with a fixed set of samples.

The article deals with the correlator detector preamble and support groups. In the detector provides the processing logic pulses in cells at several time positions. It is shown that the false alarm rate and detection threshold generated in this detector are given a choice of matching the number of cells of the correlator. The mathematical expression for calculating the characteristics of the detection of the preamble and the support group.

Set forth in Article approach to assessing the effectiveness of detection interrogations imitoprotection modes of identification system Mark XIIA can be used to define the requirements and recommendations in the selection, development or modernization of electronic intelligence.