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Belligerent sides of current military conflicts are first and foremost counting on intelligence, air supremacy, and electromagnetic spectrum dominance. Actual concepts of conducting military operations can be characterised by the massive employment of air defence systems, radars, and electronic warfare systems. An approach is aimed to strengthen air‐defence potential by improving the resilience of pulse radar against electronic warfare threats, such as an electronic attack. To cope with the above‐mentioned situation, a radar intrapulse modulation was designed, where a combination of Costas codes and Walsh‐Hadamard codes is applied. Using a particular waveform together with the proposed model for radar signal processing results in increased resilience against an electronic attack, especially against repeater jamming methods. Furthermore, it is also possible to process radar echoes at low levels of Signal‐to‐Noise Ratio (SNR), which enhances radar electronic counter–countermeasure capability. The main scientific contribution of the paper is in the unique design of the Pulse Compression Filter for Combined Intrapulse Modulation (PCF‐CIM) and in its modelling. Based on the statistical evaluation of results, using the proposed radar waveform together with PCF‐CIM, it is possible to detect radar signals with combined intrapulse modulation in the case of SNR ≥ −14 dB with TPR ≥0.9999 and FPR ≤10−6, where SNR stands for Signal‐to‐Noise Ratio, TPR stands for True Positive Rate, and FPR stands for False Positive Rate.

No abstract

Intelligence as a warfighting function is a continuous process. It is carried out before planning the mission, during the preparation of the mission, and during its execution as well. The results of the intelligence warfighting function enable commanders to predict the course of action for potential threats and facilitate the commander´s decision-making process. If intelligence information is derived from foreign communication (Communication Intelligence) and noncommunication (Electronic Intelligence) electromagnetic radiations by other than intended recipients, we are speaking about Signals Intelligence. Communication and noncommunication foreign emitters might be also denoted as Radio-Electronic objects. This paper presents an algorithm for analysis of some relevant energetic proportions of a skywave propagation, with consideration of Electronic Intelligence in the high-frequency band. In terms of Electronic Intelligence, Radio-Electronic object is represented by the Over-The-Horizon radar.

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