In order to achieve weak target detection, the range migration and Doppler frequency spread induced by motion within coherent processing interval should be compensated focus energy in a certain range-Doppler cell. This article proposes new integration method based on non-uniform Keystone transform fast Fourier (NUFFT) for random pulse repetition (PRI) radar. this method, is applied correct linear migration. After that, acceleration estimated dechirp process compensated. Finally, accumulated...

Adaptive pulse compression (APC) has been proposed based on the minimum mean square error (MMSE) criterion to effectively suppress range sidelobes of strong targets and retrieve all in multi-target scenarios. However, MMSE-based algorithms suffer from deteriorated performance presence with range-straddling due modelling mismatch. This degradation can be partially compensated by modified algorithms. To further when straddling occurs, we propose a APC algorithm robust range-straddling, namely...

The streak tube imaging lidar (STIL) system is a new 3D technology that can obtain complete frame image of the target with only one laser pulse and it has many advantages such as high rate, big field view so on over scanning-mechanism system. principle experiment will be introduced firstly pre-process data simply discussed, correction distortion, noise filter enhancement, segmentation on. All methods to above are specially adopted for STIL range target, time photoelectron flight phosphor...

This paper focus on the involved theoretical characteristics, modeling of radar target especially near field considering influence JEM (jet engine modulation) and implementation HWIL (hardware-in-the-loop) simulation system proposes a new method based multi-scattering centers. Multi-scattering centers is decomposition components target. effect caused by rotating-blades aircraft can greatly disturb useful signals scattered target's body, therefore it must be considered in like jet aircraft....

The influence of channels' amplitude and phase errors on target position precision was simulated analyzed based the principle binary array orientation. We calculated ratios electric field intensity corresponding to different positions. An iterative algorithm which used in channel calibration four-element-array simulator is designed. Experimental results prove that it can satisfy requirements high accuracy, applicable a lot simulation systems.

A Microstrip-fed quasi-Yagi phased array antenna at Ka-band is designed. This linear constituted by 8 microstrip patch unit based on low-temperature co-fired-ceramic (LTCC) substrate(FerroA6M), it has several advantages, e.g., strong direction, broad bandwidth, easy-integration with LTCC circuit systems. 3D EM simulator was utilized to analyse the simulation of array. Simulation results indicate that proposed 16dB gain 35GHz and 2G bandwidth less than −14 dB return loss, meanwhile, achieves...

In this paper, we propose a two-step detector consisting of the cascade adaptive matched filter and generalized likelihood ratio test, which is used to deal with problem detecting distributed target in interference noise. We derive theoretical expression for probability false alarm (P <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">fa</sub> ) proposed detector. For given P , there are various threshold pairs select, so that robustness or...

In this letter, we propose a novel constant envelope precoding (CEP) design for multi-user multi-input single-output (MU-MISO) downlink, where exploit the extra degrees of freedom (DoFs) by allowing individual rotation and scaling each constellation point. By jointly optimizing transmitting signal matrix complex factors, signal-to-interference-and-noise-ratio (SINR) at receiver is maximized. The formulated optimization problem divided into two sub-problems solved alternating approach. We...

Fuze digital model was established based on characteristics of RF devices and target scattering properties calculating. On the basis this model, a simulation method proposed to replace simplified such as antenna pattern. Results show that can realize nonlinearity signal level for fuze system with good generality, have high applied value in fuze-warhead design.

In a novel infrared/microwave co-aperture simulator design, tetrad of antenna array was adapted to synthesize the microwave target or interference signal. Based on analysis influence channels amplitude and phase errors simulation precision position, feed network its control process put forward. process, four signals fed kept constant while adjusting amplitude. To guarantee position accuracy, unbalance measured revised in advanced an iterative algorithm designed improve accuracy at same time.

The existing iterative adaptive filtering algorithms based on the minimum mean square error (MMSE) criterion can effectively suppress range-Doppler sidelobes of targets and unveil in multi-target scenarios. However, these suffer from deteriorated performance presence with range-Doppler-straddling when using linear frequency modulation (LFM) waveforms. To straddling occurs, this paper presents a robust pulse compression algorithm straddling- self-calibration (SR-SCIAF). received signal model...

Wideband radar systems have excellent target imaging and recognition performance because of high range resolution. However, migration occurred in long-time coherent processing range-Doppler sidelobes may deteriorate the wideband seriously, especially multi-target scenarios. To address two problems above, a fast iterative adaptive approach based on integration outputs is proposed for imaging. The algorithm first correct by Keystone transform then suppress targets within small window around...

This paper investigates cross-polarization interference cancellation (XPIC) techniques in satellite communication systems. The LMS, DD-LMS, and CMA algorithms are studied for mitigating polarization interference. Simulations conducted under different environmental conditions, including open urban environments. Results show that XPIC provides significant performance improvements, with a 5dB gain bit error rate compared to systems without cancellation. research highlights the relevance of complex

A design scheme and implementation of a Ku-Band Frequency Modulated Continuous Wave (FMCW) frequency source for THz is introduced in the paper. After program analysis, hybrid system DDS PLL formed, using phase-locked loop (PLL) chip HMC703 AD9910. Through debugging system, output power above 12 dBm, with spurious signals suppression -45dBc flatness ±1dB. In addition, signal can be from minimum 17.1GHz to maximum 19.1GHz.

The range migration (RM) and Doppler frequency (DFM) caused by the target motion would degrade coherent integration performance significantly. To address this problem, a fast parameter estimation algorithm based on time reversing transform (TRT), dechrip process (DP) Radon-Fourier (RFT), i.e., TRT-DP-RFT, is proposed. In algorithm, TRT firstly applied to remove influence of RM. Then, DP used compensate phase fluctuation induced target's acceleration achieve integration. can be estimated DP....