Research on the Sequential Difference Histogram Failure Principle Applied to the Signal Design of Radio Frequency Stealth Radar

Abstract

As electronic warfare becomes the core of modern warfare, radio frequency (RF) stealth radar is becoming the focus of modern electronic warfare. The anti-sorting strategy of RF stealth radar is a new effective method of the anti-enemy electronic reconnaissance system. Hence, research on the failure mechanism of sorting algorithms has become the cornerstone of anti-sorting technology. In this paper, the mechanism of algorithm failure is studied because the SDIF algorithm is widely used in engineering practice throughout the whole workflow of the sequential difference histogram (SDIF) algorithm, from the estimation of pulse repetition interval (PRI) destroyed by the algorithm and algorithm analysis to the staggered signal. Firstly, the working steps of the SDIF histogram sorting algorithm are considered. Key steps of signal sorting by the algorithm are analyzed, and the failure principle of the sorting algorithm is proposed. It is pointed out that if the PRI signal center value of the two groups of radars is within the tolerance range of the sorting algorithm, when the two signal center values are not of the same order of magnitude, the difference is more than 10 times, and the signal variation is less than 30% of the center value, the sorting error of the algorithm for the radar signal is at least 25%. The sorting algorithm fails to sort signals. At the same time, for the sorting failure of the staggered signal, the sub-PRI design formula of the staggered signal is proposed, and the staggered signal satisfying the design formula can make the sorting algorithm invalid. Finally, the correctness of the SDIF failure principle is further verified by formula derivation, signal design simulation and experiment. The principle of sorting failure provides theoretical support and foundation for the design of anti-sorting RF stealth signal. The principle of sorting failure makes up for the shortcomings of random signal design and improves the design efficiency of RF stealth signal.

An Algorithm for Sorting Staggered PRI Signals Based on the Congruence Transform

“…Sorting radar emitting signal is a continuous and difficult research point in the field of electronic warfare, which aims to separate different radar signals and lays the foundation for radar radiation source feature extraction and identification. Signal sorting usually contains pre-sorting based on radar waveform parameters and PRI (pulse repetition interval) sorting based on pulse sequence time of arrive (TOA) de-interleaving and PRI modulation pattern recognition [1][2][3][4][5]. With the continuous emergence of new radar system, the reconnaissance signal presents the characteristics of complex waveform parameter modulation and serious overlapping of waveform parameters among multiple emitters.…”

Design of Multi-Parameter Compound Modulated RF Stealth Anti-Sorting Signals Based on Hyperchaotic Interleaving Feedback

“…In the present complex radar electronic countermeasure environment, RF stealth radar has excellent development potential due to its excellent anti-interception and anti-sorting performance. Anti-sorting signal design is an important development direction for RF stealth radar [ 6 , 32 ]. In addition, anti-PRI sorting signal design requires the relevant theoretical basis for the signal design.…”

“…Therefore, to improve the survival rate of radars on the battlefield, RF stealth radars have become a research hotspot in the radar field. In accordance with the three detection stages of signal interception, sorting, and recognition of broadband real-time electronic reconnaissance equipment, such as radar alarm receivers, the corresponding radar RF stealth strategies mainly include anti-interception [ 3 , 4 , 5 ], anti-sorting [ 6 ], and anti-identification. Anti-interception is primarily achieved through RF stealth, including power control of the radiation source [ 7 , 8 ], directional antenna designs [ 9 ], and low-interception waveform designs [ 10 , 11 ].…”

Chaotic Mapping-Based Anti-Sorting Radio Frequency Stealth Signals and Compressed Sensing-Based Echo Signal Processing Technology

“…With the wide application of radar on the modern battlefield and the rapid development of signal processing technology, broadband real-time electronic reconnaissance equipment represented by radar warning receivers has rapidly improved the reconnaissance ability of radar; however, it greatly compresses the living space of radar on the battlefield and seriously affects the performance of radar [ 1 , 2 , 3 , 4 ]. Therefore, radio frequency (RF) stealth radar has become a research hotspot in the radar field.…”