Owing to the global coverage and high visibility of navigation satellite systems (GNSS), passive radar using GNSS satellites as transmitters opportunity has shown great potential for moving target detection, its possibility detect short-range maritime targets been verified. Nevertheless, existing methods always require tens seconds echo integration, which is not ideal detection with maneuverability. To solve this problem, a bistatic configuration BeiDou geostationary earth orbit (GEO)...

When mosaicking orthoimages, especially in urban areas with various obvious ground objects like buildings, roads, cars or trees, the detection of optimal seamlines is one key technologies for creating seamless and pleasant image mosaics. In this paper, we propose a new approach to detect orthoimage use deep convolutional neural network (CNN) graph cuts. Deep CNNs have been widely used many fields computer vision photogrammetry recent years, cuts most energy optimization frameworks. We first...

A new high-frequency backscatter radar (Wuhan Ionospheric Oblique Backscattering Sounding System) for ionospheric sensing and study has been developed. With the system design, oblique sounding can be achieved in this just through simply loading appropriate software. Furthermore, due to alternate transmission reception equal interval, detect state range of a few thousand kilometers achieve largest gain applied pseudorandom sequences. In addition, usually obtains 27-dB from phase coded pulse...

Egypt, a country with harsh natural environment and rapid population growth, is facing difficulty in ensuring its national food security. A novel model developed for assessing security which applies remote sensing techniques, presented. By extracting the gray-level co-occurrence matrix (GLCM) mean texture features from Sentinel-1 Landsat-7 images, arable land used to grow grain crops was first classified extracted using support vector machine. In terms of results, meteorological data,...

A power line is particularly vulnerable to wildfires in its vicinity, and various damage including tripping can be caused by wildfires. Using remote sensing techniques, a novel model developed assess the risk of wildfire occurrence high-voltage corridors presented. This mainly contains assessment for estimation probability when occurs corridors. For assessment, high-resolution satellite data, Moderate Resolution Imaging Spectroradiometer (MODIS) meteorological digital elevation (DEM) data...

The ionospheric laboratory of Wuhan University, Wuhan, China, has developed a new sounding system for about seven years. first is used oblique backscattering detection and called the (WIOBSS). WIOBSS portable monostatic backscatter ionosonde research high-frequency (HF) channel management, adopting alternate transmitting receiving patterns to transmit long coded pulse trains high pulse-compression gain. However, it difficult recognize echo path mode only with ionogram. Therefore, separate...

In this paper, a novel oblique-incidence ionosonde (Wuhan Ionospheric Oblique-Incidence Sounding System) and its new application in the localization of ionospheric irregularities are presented. Due to usage binary-phase-coded waveform, large signal processing gain, high Doppler range resolution, unambiguous detection can be achieved ionosonde. This also adopts peripheral component interconnect extensions for instruments (PXI) bus technology is designed as small-sized PXI-based system....

In this letter, a new high-frequency (HF) skywave multistatic radar that is used for ionospheric sensing and aircraft detection presented. With multiple receiving sites, can detect the in much larger surveillance with high probability obtain characteristics of many paths simultaneously. addition, adopts binary-phase-coded continuous waveform to achieve Doppler resolution, large signal processing gain, low interception. Details system configuration, ambiguity function sounding waveform,...

Wuhan ionospheric oblique backscattering sounding system (WIOBSS) is a low‐power high‐frequency monostatic radar used for sensing and aircraft detection. In this study, novel waveform combining the pseudo‐random binary phase coding (PRBPC) chirp modulation proposed radar. Furthermore, in terms of requirements, four subclasses are theoretically compared to determine which one them most suitable WIOBSS, including inter‐pulse PRBPC where width subpulse equal duration, period sequence...

Many spaceborne synthetic aperture radars (SARs), which operate separately in the X, C, and L bands, have been employed to monitor ultra-high-voltage (UHV) extra-high-voltage (EHV) power lines. However, a full interpretation of scattering characteristics these lines SAR images remains challenging task. A numerical simulation radar cross-section (RCS) UHV/EHV L, P bands over wide range incidence angles is presented this paper. physical model line first built. Here, two practical shapes are...

This paper presents an optimal seamline detection method for orthoimage mosaicking. To ensure that the detected seamlines avoid crossing many obvious objects, we first design a simple but effective criterion in gradient domain lieu of traditionally used intensity to measure visibility seam. Thereafter, fuse this new into graph cuts energy minimisation framework globally find last seamlines. Instead finding solutions overlap regions via among entire set pixels, them superpixels created from...

In this letter, a novel ionospheric oblique-incidence sounding network consisting of the oblique backscatter sounder and parasitic is presented. With new configuration, ionogram can be provided at same time. Due to usage waveform combining pseudorandom phase coding chirp modulation, about 130-dB signal processing gain usually obtained improve signal-to-noise ratio for low-power transmission. Furthermore, through choosing different types sequences each transmitter, many ionograms that depict...

This paper illustrates the processes carried out for application of biphase complete complementary code (CCC) ionospheric sounding to address coherent interference problem in multi-station sounding. An algorithm generate CCC is described, and detailed process waveform construction signal processing presented. Characteristics autocorrelation cross-correlation are analyzed through simulations, technical feasibility explored. Experiments with also implemented verify performance. Results...

The joint use of spaceborne microwave sensor data and Cyclone Global Navigation Satellite System (CYGNSS) to observe tropical cyclones (TCs) is presented in this paper. Soil Moisture Active Passive (SMAP) radiometer was taken as an example a sensor, its the CYGNSS were fused fix center TC measure maximum wind speed around inner core. This process included preprocessing, image fusion, determination position, estimation TC’s intensity. For all observed hurricanes, experimental results...

In this letter, a novel radar waveform is proposed for low-power high-frequency monostatic used ionospheric sensing and aircraft detection. waveform, hybrid modulation scheme adopted, where the pulse-to-pulse phase coded by WG sequence, frequency of each subpulse linearly modulated with fixed chirp rate. Compared conventional binary-phase-coded larger signal processing gain, higher range resolution, lower sidelobes can be simultaneously achieved waveform. Furthermore, it more insensitive to...

Egypt, a country with harsh natural environment and rapid population growth, has being plagued by the problem of food security. Application remote sensing techniques, original model for assessing security in Egypt is presented. By extracting gray-level co-occurrence matrix (GLCM) mean texture features, arable land used to grow grain crops was first classified extracted using Support Vector Machine. In terms results, meteorological data, NDVI CASA adopted compute annual net primary production...

A numerical simulation of the electromagnetic scattering characteristics ultra-high-voltage (UHV) power line at X-band over a wide range incidence angle is presented. The geometry and material properties UHV are first described, then high frequency method (HFM) used to analyze its X-band. Here, two shapes considered, including symmetrical parabola in case where adjacent pylons have same height, inclined catenary heights different. results show that influenced by angle, height difference...

With the continuous improvement of spatial resolution spaceborne synthetic aperture radar (SAR), detection ultra-high voltage (UHV) power transmission line in high-resolution SAR images has become possible. However, backscattering characteristics UHV a image are significantly influenced by several factors including span length and polarimetry. In this paper, effects polarimetry on analyzed using TerraSAR-X images. We first give brief introduction to imaging geometry line. Subsequently, for...