The proliferation of massive polarimetric Synthetic Aperture Radar (SAR) data helps promote the development SAR image interpretation. Due to advantages powerful feature extraction capability and strong adaptability for different tasks, deep learning has been adopted in work interpretation achieved good results. However, most methods only employ single-polarization images ignore water features embedded multi-polarization images. To fully exploit dual-polarization multi-scale images, an...

The rapid development of wireless communication technology has led to an increasing number internet thing (IoT) devices, and the demand for spectrum these devices their related applications is also increasing. However, scarcity become increasingly serious problem. Therefore, we introduce a collaborative sensing (CSS) framework in this paper identify available resources so that IoT can access them and, meanwhile, avoid causing harmful interference normal primary user (PU). process PUs signal...

ABSTRACT A multifunction radar (MFR) can operate in multiple modes and perform various tasks such as surveillance, detection, fire control, search tracking. Recognising an MFR's operating mode is critical electronic warfare intelligence reconnaissance, aiding practical threat assessment countermeasure tasks. However, current recognition methods face challenges overlapping parameters among working suboptimal accuracy under conditions with parameter errors, missing pulses false pulses. Spurred...

Nyquist folding receiver (NYFR) is a novel ultra-wideband architecture which can realize wideband receiving with small amount of equipment. Linear frequency modulated/binary phase shift keying (LFM/BPSK) hybrid modulated signal kind low probability interception wide bandwidth. The NYFR an effective to intercept the LFM/BPSK and intercepted by will add local oscillator modulation. A parameter estimation algorithm for output proposed. According prior information, chirp singular value ratio...

This paper focuses on the modified Cramer-Rao bounds (MCRBs) related to estimating parameters of a noisy hybrid modulated signal which combines pseudo-random binary codes (PRBC) phase modulation and linear frequency (LFM) gives theoretical performance for estimators. The be estimated PRBC-LFM include amplitude, carrier phase, frequency, chirp rate symbol width. are interference make analytical calculation real CRBs difficult. MCRB single parameter while treating others as unwanted was...

Nyquist folding receiver (NYFR) can realize the wideband receiving with a small amount of equipment. As tradeoff between equipment and complexity signal processing, NYFR output is usually hybrid modulated signal. Therefore, it necessary to investigate parameter estimation method intercepted by NYFR. Binary phase shift keying (BPSK) typical low probability intercept radar authors focus on BPSK Firstly, matching component function proposed obtain zone (NZ) index. Then, Hankel-singular value...

The electromagnetic environment is becoming increasingly complex and the non-cooperative radar receiver will intercept multiple concurrent signals. binary phase shift keying/linear frequency modulated (BPSK/LFM) hybrid signal a novel kind of low probability (LPI) signal. In this paper, new parameter estimation method proposed for BPSK/LFM squaring process fractional Fourier transform are used to estimate chirp rate. Then, output interference plus noise ratio (SINR) analyzed. Finally, code...

The frequency space of modern radar system has been extended to a wide range. To intercept the signals with high interception probability, wideband receiving is significance reconnaissance receiver. Nyquist folding receiver (NYFR) novel ultra-wideband architecture, which requires small amount equipment. Because mono-pulse signal widely used in systems, multiple will be intercepted by NYFR. parameter estimation simultaneous arrival NYFR using periodic chirp local oscillator considered....

The static and dynamic characteristics for various electromagnets are computed by means of a 2-D or 3-D finite element method. software has good, general pre- postprocessing functions runs on microcomputers. Color graphical input output used extensively. Optimization can be done combining the program with orthogonal experiment design method, so CAD electromagnets.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Frequency shift keying (FSK) signal has been widely used in modern radar systems. To intercept the FSK with a high interception probability, reconnaissance receiver should have an ultra-wideband receiving ability. The Nyquist folding (NYFR) is novel non-cooperative and it requires small amount of equipment. When intercepted by NYFR, corresponding output hybrid modulation signal. Therefore, necessary to investigate parameter estimation NYFR. Herein, based on NYFR using sinusoidal frequency...

Nyquist folding receiver (NYFR) is a novel reconnaissance receiving architecture and it can realize wideband with small amount of equipment. As tradeoff non-cooperative receiving, the NYFR output will add an unknown key parameter that called zone (NZ) index. In this letter, we concentrate on NZ index estimation output. Focusing basic pulse radar signals, constant frequency signal, binary phase coded signal linear modulation are considered. The matching component function proposed to estimate...

The Wuhan Ionospheric Oblique Backscatter Sounding System (WIOBSS) was applied as a bistatic radar to record the ionospheric E-region responses solar eclipse on 22 July 2009. transmitter located in and receiver Huaian. observed anomalous echoes with larger Doppler shifts at farther ranges compared reflected by Es. According simulated ray propagation paths of scattered waves, we considered that were field-aligned irregularities (FAIs). locations FAIs recorded WIOBSS estimated International...

Publicly available ionograms are often in the form of pictures. This paper proposes a novel algorithm for extracting and repairing F layer traces from pictorial ionograms. Extensive efforts have been invested ionogram autoscaling critical parameter identification to improve efficiency scaling algorithms. To obtain parameters automatically, it is necessary accurately extract trace. However, research on trace extraction with repair relatively limited. The method employed this study makes full...

Nyquist folding receiver (NYFR) is a novel ultra-wideband which can use small amount of equipment to realize wideband receiving. The NYFR an effective architecture intercept the LFM signal and intercepted by will be added with zone (NZ) information. Based on prior information, NZ information estimation algorithm proposed using matching component function. Then, parameters are estimated. simulation results demonstrate that estimate accurately when SNR greater than −4dB.

Abstract The modulated sampling scheme can intercept noncooperative signals distributed in a wide frequency band by using single receiving channel, which is an efficient architecture many radar and communication applications. employs non-uniform sample pulse train to fold the intercepted signal prior quantization/digitization local oscillator (LO) that contains certain modulation type. Since mono-pulse are widely used systems, will receive multiple simultaneously dense environment, folded...

Adaptive multilooking is a critical processing step in multi-temporal interferometric synthetic aperture radar (InSAR) measurement, especially small temporal baseline subsets. Various amplitude-based adaptive multilook approaches have been proposed for the improvement of processing. However, phase signal, which fundamental systems, typically ignored these methods. To fully exploit information complex SAR images, nonlocal based on covariance matrix this work. The signal here exploited...

The Nyquist folding receiver (NYFR) is a novel analog-to-information architecture, which can achieve wideband receiving with small amount of system resource. NYFR uses radio frequency (RF) non-uniform sampling to realize receiving, and the practical RF sample pulse train usually contains an aperture. Therefore, it necessary investigate aperture impact on output. In this letter, based output signal noise ratio (SNR), analyzed. Focusing impact, corresponding power are given firstly. Then,...

This paper presents the analytical resistance–capacitance–inductance–conductance (RLCG) model of on-chip interconnect line (IL) based on its structure, and proposed can be used to design IL analyze delay characteristics. Using electromagnetic (EM) simulation, relations between inductance, quality factor width, length are obtained, which verifies RLCG IL. The is derived verified with respect effects [Formula: see text] by provide benefit for true-time (TTDL) using work proposes experiments...