As the use of radar and jammers increases, a device is likely to face interference from or other devices. Traditional phase-coded pulse compression devices are widely used, but these tools struggle overcome jamming mutual interference. To solve this problem, we propose novel chaotic-encrypted signal based on identity (ID). Each has its own ID, which encrypted with different chaotic binary sequences in every period. The ambiguity function calculated for coded thumbtack-shaped, indicating that...

This paper considers the problem of target and jamming recognition for pulse Doppler radar fuze (PDRF). To solve problem, matched filter outputs PDRF under action are analyzed. Then, frequency entropy peak-to-peak ratio extracted from output PDRF, time-frequency joint feature is constructed. Based on feature, naive Bayesian classifier (NBC) with minimal risk established recognition. improve adaptability proposed method in complex environments, an online update process that adaptively...

Automatic modulation recognition (AMR) of radiation source signals is a research focus in the field cognitive radio. However, AMR at low SNRs still faces great challenge. Therefore, method based on two-dimensional data matrix and improved residual neural network proposed this paper. First, time series are reconstructed into matrix, which greatly simplifies signal preprocessing process. Second, depthwise convolution large-size convolutional kernels (DLRNet) to improve feature extraction...

The false target caused by interference obfuscates the real detection of radio frequency proximity sensor (RFPS). In this article, an adaptive false-target recognition method is proposed to classify echo and target. Two strategies are designed for targets different interference. first strategy, each RFPS assigned identity (ID) with chaotic encryption. For a better performance against barrage interference, joint features range profiles Fourier spectrum extracted in second strategy. Naïve...

Pulse Doppler (PD) fuze is widely used in current battlefield. However, with the threat of repeater jamming, especially digital radio frequency memory technology, deficiency anti-repeater jamming a traditional PD increasingly emerges. Therefore, suppression method for based on identity (ID) recognition and chaotic encryption proposed. Every has its own ID which encrypted different binary sequences every pulse period transmitted signal. The thumbtack-shaped ambiguity function shows good...

To solve the problem of low interference success rate air defense missile radio fuzes due to unified form traditional fuze system, an decision method based Q-learning algorithm is proposed. First, dividing distance between and target into multiple states increase quantity state spaces. Second, a multidimensional motion space utilized, search range which changes with projectile, select parameters minimize amount ineffective parameters. The effect determined by detecting whether signal...

The identification of intercepted radio fuze modulation types is a prerequisite for decision-making in interference systems. However, the electromagnetic environment modern battlefields complex, and signal-to-noise ratio (SNR) such environments usually low, which makes it difficult to implement accurate recognition fuzes. To solve above problem, automatic (AMR) method low-SNR proposed. First, an adaptive denoising algorithm based on data rearrangement two-dimensional (2D) fast Fourier...

Accurately estimating the modulation parameters of pseudorandom binary code–pulse amplitude (PRBC–PAM) signals damaged by strong noise poses a significant challenge in emitter identification and countermeasure. Traditionally, weak signal detection methods based on chaos theory can handle situations with low signal-to-noise ratio, but most them are developed for simple sin/cos waveform cannot face PRBC–PAM commonly used ultra-low altitude performance equipment. To address issue, this article...

Abstract The proximity pulse Doppler radar (PPDR) possesses high-range resolution and has been widely used in short-range detection. Unfortunately, the detection performance is seriously deteriorated by interference. Therefore, a dynamic interference suppression method (DISM) based on game model proposed. In DISM, three strategies are proposed for different strategies. first strategy deceptive via identity recognition of PPDR. second barrage strategy, which realized time-frequency joint...

TD-LTE technology can be introduced to improve the performance of military wireless communication system greatly for its better capability broadband transmission while existing network cannot meet with increase and further requirements task types. The technical characteristics advantages are analyzed, problem security, anti-jamming mobility which solved if applied in mainly studied, solutions given.

BATAMAN (Better Approach to Mobile Ad-hoc Networking) is a new wireless Mesh network protocol. The algorithm of BATMAN protocol was analyzed, the designed based embedded Linux and realized on self-developed node mounting multiple Wi-Fi modules. pragmatic performance test in multi-hop prototype network. result shows that: characteristics throughput latency which lightweight, rapid convergence efficient can meet real-time broadband transmission requirement

Channel assignment strategy is a key factor for building robust and high performance wireless Mesh network. A new channel algorithm called TriCA which considers data traffic interference proposed, the model constructed idea, computing method program process are discussed deeply. The simulation result shows that can minimize link effectively, its better than popular MesTic due to property of fast convergence linearization.

PMP-AODV routing protocol which introduces priority setting, multi-point relay and path stability is proposed. The algorithm message format discussed, the MPR selection elaborated, measurement of designed, working flow analyzed. simulation result shows that less packet loss rate lower end-to-end delay than original AODV under large wireless Mesh network.

A Wireless Broadband Communication System has been made up based on OFDMA and AMC technologies. The system structure working pattern is introduced, the allocation model, MIMO scheme are present, parameter such as transmitting power, receiver sensitivity, antenna gain receiving designed. enables high quality wireless broadband communication. As a supplement with wired communication systems, could fulfill requirement of recovery local rapidly when some accidents take place.

The interrupted-sampling repeater jamming (ISRJ) can cause false targets to the radio-frequency proximity sensors (RFPSs), resulting in a serious decline target detection capability of RFPS. This article proposes recognition method for RFPSs identify caused by ISRJ. proposed is realized assigning unique identity (ID) each RFPS, and ID periodically chaotically encrypted every pulse period. processing technique received signal divided into ranging decryption. In part, high-resolution range...