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Aviation communications navigation jamming analysis

Time：

2023-12-28 11:06

Human interference is the main source of signal interference in aviation communication navigation. The classification of aviation communication navigation interference types is mainly divided into intermodulation interference, out-of-band interference, and same-frequency interference.
(A) intermodulation thousand interference. Intermodulation interference is a type of interference that occurs in more situations in aviation communications. Intermodulation interference refers to the transmission of multiple frequency signals, due to the nonlinear modulation of the transmitter resulting in the generation of new unwanted frequencies, the formation of interference to the equipment receiving the signal, affecting the reception of data. In order to reduce intermodulation interference and guarantee the effective dissemination of information. Firstly, the transmitter and receiver should be isolated to avoid signal interference, and after isolation, filtering equipment should also be added to ensure that the signals do not affect each other. Secondly, try to avoid the same frequency or similar frequency synchronous use, scientific optimisation of the combination of frequencies to achieve the purpose of information dissemination.
(ii) Out-of-band interference. Out-of-band interference is divided into the launch of out-of-band interference and receiving out-of-band interference, specifically refers to the launch or reception of radio, due to radio radiation on the launch of the receiving work caused by the interference. Radio transmission process, the use of oscillators to obtain frequency stability, resulting in a large number of harmonics, interference with the same frequency of the receiving work. In the radio reception process, in addition to the effective information reception, will also receive other frequencies of the radio, the reception of other radio frequencies is the main cause of out-of-band interference, affecting the reception of the correct information, resulting in loss of information. In order to reduce the occurrence of this situation, the relevant departments of our country on a variety of radio transmitter radiation value have certain boundaries, to prevent radiation on the surrounding receiver
Receiver to prevent radiation from causing a greater impact.
(c) Co-frequency interference. Co-frequency interference refers to the frequency of the signal is similar, in the process of receiving the useful signal useless signal unified reception, resulting in information confusion. Co-frequency interference is still part of the reason for the formation of intermodulation interference, affecting the signal transmission and reception, at the same time, to reduce co-frequency interference can be prevented from receiving the work of out-of-band interference.

Types of civil aviation communication, navigation and surveillance equipment

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Types of civil aviation communication, navigation and surveillance equipment

Aviation communications navigation jamming analysis

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