On the basis of studying several existing evaluation criteria of electronic interference effects, the characteristics of each criterion are analyzed in depth, and the power criterion and information criterion are applied to the evaluation of suppressive interference and deceptive interference respectively, and the probability criterion is applied to a certain system. The evaluation of the anti-interference ability and the evaluation of the efficiency of the system are superior to the efficiency criteria.
Keywords electronic interference; effect evaluation; electronic countermeasure
In a complex electromagnetic environment, high-tech electronic warfare will become the mainstay of future wars. Jamming EffecTIveness assessment is the core issue of electronic countermeasures, and is also a key technology for electronic countermeasures research and development of electronic countermeasures equipment. It provides objective and accurate estimation of equipment operational effectiveness and improves its interference performance or anti-interference performance. Significance.
Interference effects in the field of electronic countermeasures refer to the combined effects of indirect or direct damage to electronic devices, electronic detection systems, and operators, after electronic interference with other electronic systems. Therefore, when electronic interference is performed on an electronic system, the interference effect can characterize the degree of damage, the degree of interference, and the degree of damage to the operator suffered by the interfered electronic system. In a given environment, reduce the locking probability of the other detecting device below the expected value, or make the expected tracking error threshold less than the actual device tracking error, or increase the actual device error rate to a given Above the threshold, this type of electronic interference is called EffecTIve Jamming. Effective interference can reflect whether the interference to an electronic system is effective.
In the evaluation of the effect of electronic interference, various interference effect evaluation criteria, such as power criterion, information criterion, probability criterion and efficiency criterion, have been proposed. These criteria are proposed according to the type of different interference signals and the electronic system to be interfered. specialty.
Some criteria are based on different interference measures, some are based on types of anti-interference measures, others are for engineering practicability, while others are theoretically strong, and some guidelines are proposed for the whole system. However, there are currently no standardized guidelines and no widely accepted evaluation criteria that can effectively achieve the desired goals in engineering practice. This is because the existing evaluation criteria are based on the attributes of the electronic countermeasures system, the purpose of the project, and the prior knowledge of the actual work. Therefore, each criterion has its own point of view.
Therefore, the paper analyzes and discusses each criterion in detail, clarifies its respective attributes, and the applicable environment, and provides an effective reference for selecting appropriate evaluation criteria for actual electronic countermeasures.
According to the efficiency of some anti-interference measures in electronic countermeasures systems, electronic countermeasures researchers have proposed power criteria and information standards. The specific performance is to effectively suppress the interference of an electronic countermeasure system, or the information obtained by the electronic countermeasure system that is suppressed from being interfered with contains a large amount of error information, or causes a large loss of information, and the effective information obtained is insufficient. These two criteria are usually reflected by the suppression coefficient, which is the ratio of the minimum interference signal power threshold to the power of the electronic countermeasure signal when the electronic countermeasure system receives the information.
When the interference signal interferes with the interfered electronic system, the effective information is largely lost. The main methods are: signal deviation, signal active simulation, disturbance segment signal transmission, and signal coverage. When the characteristics of the interfered system are consistent with the characteristics of the interference signal, the amount of information lost by the interfered system is large, and when the characteristics of the interfered system do not match the characteristics of the interfered signal, the amount of information lost by the interfered system is small, and even the interference is not effect. Therefore, whether effective interference has meaning is determined according to the specific type of electronic countermeasures.
The power criterion, also known as the dry-signal ratio criterion, is expressed by the suppression coefficient K, which characterizes the minimum interference power Pj required at the receiver input and the target echo signal power Ps at the input of the electronic countermeasure system when the electronic countermeasure system is disturbed. Ratio, ie
According to the analytical formula (1), when the same interference occurs, the larger the suppression coefficient Ks is, the larger the interference signal power Pj indicating the effective interference with the electronic countermeasure system is. On the contrary, the smaller the suppression coefficient Ks is, the effective interference with the electronic countermeasure system. The interference signal power Pj is smaller. Therefore, the suppression coefficient Ks can effectively reflect the anti-interference ability of the electronic countermeasure system, and it is suitable for the evaluation of the suppression type interference effect.
The power criterion is currently the most widely used method for evaluating anti-jamming effects. Its characteristics are as follows:
(1) The power criterion reflects the minimum interference to signal ratio when the interference effect on the interfered object reaches a certain level. If it is used to evaluate the interference effect on the interfered object, it is more abstract and unintuitive. Therefore, it is more suitable for evaluating the anti-interference ability of the interfered object.
(2) Accurate measurement of compression coefficient Ks in practical engineering applications is quite difficult. Therefore, in practical engineering applications, it is not appropriate to use power criterion evaluation. (3) Normal power criterion is applicable to the evaluation of suppressive interference effects of electronic countermeasure systems. .
Measuring the interference effect from the perspective of information loss is an information criterion. The basic idea is to evaluate the interference effect by using the change of the amount of target information contained in the electronic countermeasure signal before and after the interference. For example, the volumetric changes of the observation space before and after the interference are used to evaluate the interference effect. In some of the technical indicators of the electronic interference device, the interference effect is proposed by using the efficiency criterion.
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