Robust prediction of citywide traffic flows at different time periods plays a crucial role in intelligent transportation systems. While previous work has made great efforts to model spatio-temporal correlations, existing methods still suffer from two key limitations: i) Most models collectively predict all regions' without accounting for spatial heterogeneity, i.e., regions may have skewed flow distributions. ii) These fail capture the temporal heterogeneity induced by time-varying patterns,...

With appropriate geometry configurations, bistatic synthetic aperture radar (SAR) can break through the limitations of monostatic SAR on forward-looking imaging. Thanks to such a capability, (BFSAR) has extensive potential applications, as self-navigation and self-landing. In mode BFSAR with stationary transmitter (ST-BFSAR), two-dimensional spatial variation makes it difficult use traditional data focusing algorithms. this letter, an imaging algorithm based keystone transform nonlinear...

With the geosynchronous synthetic aperture radar (SAR) satellite as transmitter, unmanned aerial vehicle (UAV) can passively receive echo within illuminated ground area and achieve 2-D imaging of interested target. This SAR system, known GEO-UAV bistatic SAR, is capable autonomously accomplishing mission in rough terrain environments by prespecifying a path for UAV receiver. In this paper, system first investigated. The practical advantages spatial resolution are then analyzed detail....

In synthetic aperture radar (SAR) imagery, images of ground moving targets (GMTs) are smeared, distorted, and shifted. Current GMT imaging methods mostly based on range-Doppler algorithms, which have two main drawbacks: 1) coupling between range cell migration correction (RCMC) Doppler parameter estimation 2) cross terms degrade the performance nonlinear methods. this paper, an optimal 2-D spectrum matching method for SAR is proposed. The innovation or advantage that problem transformed into...

Due to the division of transceiver, a bistatic synthetic aperture radar (SAR) gains many advantages, such as forward-looking imaging and powerful anti-interference capabilities. In meantime, information sharing (e.g., positions status) between transmitter receiver is required for SAR imaging. This article addresses co- use waveform design SAR-dual-functional communication (SAR-DFRC). To this end, we embed into time-frequency spectrum phase coded signal, which can be feasible solution...

With appropriate geometry configurations, bistatic synthetic aperture radar (SAR) can break through the limitations of monostatic SAR on forward-looking imaging. Thanks to such a capability, (BFSAR) has extensive potential applications. In this paper, we categorize various airborne and ground based BFSAR give their possible applications, challenges processing approaches. After that, gradient theory, analyze resolution performance different mode present intrinsic reasons why carry out

Geosynchronous synthetic aperture radar (GEO-SAR) offers new opportunities for continuous Earth observation missions with large coverage and short revisit cycle. The unique features of GEO-SAR present huge potentials bistatic applications. In this paper, the concept advantages GEO SAR (GEO-BiSAR) are first investigated. system consists a illuminator an airborne receiver, such as airplane or near-space vehicle. Compared monostatic system, configuration can provide finer spatial resolution...

Water scarcity may appear to be a simple concept, but it can difficult apply complex natural‐human systems. While aggregate indices are straightforward compute, they do not adequately represent the spatial and temporal variations in water that arise from systems interactions. The uncertain effects of future climate change on add need for clarity concept scarcity. Starting with robust definition—the marginal value unit we—highlight key aspects illustrate its many biophysical socioeconomic...

Bistatic forward-looking synthetic aperture radar (BFL-SAR) is a kind of bistatic SAR system that can image terrain in the flight direction an aircraft. Until now, BFL-SAR imaging theories and methods have been researched for stationary targets. Unlike target, motion ground-moving target (GMT) induces unknown range cell migration additional modulation azimuth signal. Thus, to finely GMT, one must obtain its velocity parameters accurately, but they are usually unknown. In this paper, novel...

Bistatic forward-looking synthetic aperture radar (BFSAR) is a kind of bistatic SAR system that can image terrain in the flight direction receiver. Current literature and reports about BFSAR mainly concentrate on stationary scene ground-moving target imaging. Unlike targets, translational rotational movements ship targets usually lead to complicated range cell migration (RCM) Doppler frequency (DFM). Moreover, characteristics RCM DFM for different scattering points are significantly...

Clutter suppression is a challenging task in synthetic aperture radar-ground moving target indication (SAR-GMTI). In general, sufficient secondary samples are not easily acquired due to the nonstationary and nonhomogeneous characteristics of bistatic SAR (BiSAR) clutter, resulting worse clutter results. Recently, space–time adaptive processing based on sparse recovery (SR-STAP) has been developed since its better performance with less samples. However, off-grid problem domain caused by...

Highly constrained multiobjective optimization problems (HCMOPs) refer to (CMOPs) with complex constraints and small feasible regions, which are commonly encountered in many real-world applications. Current constraint-handling techniques will face two difficulties when dealing HCMOPs: 1) solution is hard be found too much search effort spent locating the region 2) since total of an HCMOP can consist several disconnected subregions, process might stuck comparatively larger subregion, does not...

With appropriate geometry configurations, bistatic synthetic aperture radar (SAR) can break through the limitations of monostatic SAR on forward-looking imaging. Owing to such a capability, (BFSAR) has extensive potential applications. In BFSAR, compensation spatially variant motion errors is great significance get well-focused image. this paper, first, spatial-variance properties are analyzed analytically and quantitatively. Different from side-looking SAR, 2-D space-variant should be taken...

Due to left/right Doppler ambiguity, and the small difference in frequencies of adjacent points flight direction, conventional monostatic SAR can not be used for forward-looking imaging. Then bistatic with transmitter receiver mounted on different platforms is coming into eyes researchers. In this paper, feasibility imaging using airborne studied. Firstly, potential two-dimension resolution ability discussed from aspect iso-Doppler iso-range line. experiment a side-looking described,...

This article uses the 2007 Farm and Ranch Irrigation Survey database developed by U.S. Department of Agriculture to assess impact water scarcity climate on irrigation decisions for producers specialty crops, wheat, forage crops. We estimate an management model major crops in West Coast (California, Oregon, Washington), which includes a farm‐level equation irrigated share crop‐specific equations technology adoption application rate (orchard/vineyard, vegetable, alfalfa, hay, pasture). find...

In geosynchronous spaceborne-airborne bistatic synthetic aperture radar (GEO-BiSAR) system, the airborne platform achieves high-resolution imaging by passively receiving signal from interested scenario. this paper, Doppler characteristics of GEO-BiSAR and individual contribution transmitter receiver are first analyzed. The is found to be dominant contributor for total bandwidth, which will lead spectrum aliasing regarding low pulse repetition frequency (PRF) adopted GEO-SAR. order suppress...

Due to the high-altitude illumination and separation of receiver transmitter, geosynchronous (GEO) spaceborne-airborne bistatic synthetic aperture radar (BiSAR) is more flexible accessible in remote sensing applications. In this paper, Doppler characteristics GEO BiSAR with a squint are analyzed. It found that spectrum generally aliased regarding low pulse repetition frequency (PRF) adopted by SAR. order suppress ambiguity without adjusting PRF SAR, azimuth multichannel receiving technique...

Due to its flexibility and low cost, the bistatic forward-looking synthetic aperture radar (BFSAR) which employs side-looking transmitter receiver has been studied in recent years. Sparsity-based techniques have applied field of BFSAR imaging show great potential. In sparsity-based imaging, compensation motion errors is crucial get a well-focused image. For fields that admit sparse representation, we propose approach integrated with error estimation this paper. First, novel joint...

Due to its ability of forming continuous images for a ground scene interest, the video synthetic aperture radar (SAR) has been studied in recent years. However, as SAR needs reconstruct many frames, data are enormous amount and imaging process is large computational cost, which limits applications. In this article, we exploit redundancy property multiframe data, can be modeled low-rank tensor, formulate tensor recovery problem, solved by an efficient alternating minimization method. We...

Echoes of bistatic forward-looking synthetic aperture radar (BFSAR) disperse to multiple range cells and exist spatial frequency extension as well Doppler spectrum (i.e., namely space-time extension). Furthermore, the characteristics BFSAR clutter are strongly nonstationary variants. Because abovementioned issues, moving targets fully overlapped in initial 3-D space-time-range raw data domain, cannot be suppressed effectively. To solve this problem, a multipulse displaced phase center...

This article puts forward a BeiDou-based passive multistatic radar (PMR) maritime moving target (MMT) detection technique via space–time hybrid integration (STHI) processing. Compared with bistatic (PBR), the utilization of multiple satellites provides an improvement in MMT performance, together capabilities localization and velocity estimation. However, satellite transmitters cause differences principally range Doppler centroid (DC) MMT. To integrate PMR echoes, biggest challenge is...

Unauthorized light injection has always been a vital threat to the practical security of quantum-key-distribution (QKD) system. An optical-power limiter (OPL) based on thermo-optical defocusing effect proposed and implemented, limiting injected hacking light. As hardware countermeasure, performance OPL under various light-injection attacks will be tested clarify boundary before it is widely deployed. To investigate in quantum cryptography, we comprehensively test analyze behavior...

Forward-looking imaging and target detection are highly desirable in many military civilian fields, such as search rescue, sea surface surveillance, airport guidance. However, during the processing procedure, usually regarded two independent parts, which means that result will directly affect performance. In this paper, LRSD-ADMM-net is proposed to achieve simultaneous super-resolution for forward-looking scanning radar. Firstly, low-rank sparse constraints regularization norms incorporated...