Weather permitting, the string of satellites will be quite the sight over Northern Ireland's night sky

A Non-terrestrial Network (NTN) comprising Low Earth Orbit (LEO) satellites can enable connectivity to underserved areas, thus complementing existing telecom networks. The high-speed satellite motion poses several challenges at the physical layer such as large Doppler frequency shifts. In this paper, an analytical framework is developed for statistical characterization of Doppler shift in an NTN where LEO satellites provide communication services to terrestrial users. Using tools from stochastic geometry, the users within a cell are grouped into disjoint clusters to limit the differential Doppler across users. Under some simplifying assumptions, the cumulative distribution function (CDF) and the probability density function are derived for the Doppler shift magnitude at a random user within a cluster. The CDFs are also provided for the minimum and the maximum Doppler shift magnitude within a cluster. Leveraging the analytical results, the interplay between key system parameters such as the cluster size and satellite altitude is examined. Numerical results validate the insights obtained from the analysis.

A rover processor determines position of a rover based upon the interaction between multiple antennas located at the rover and multiple antennas located at a base. The rover antennas may include a rover master antenna having a phase center located at the centroid of the antennas patterns of at least two auxiliary rover antennas. The rover processor may determine the position of the rover master antenna based upon the relative positions of at least two rover antennas (e.g., the rover master antenna and at least one rover auxiliary antenna, or at least two rover auxiliary antennas) with respect to at least two antennas of a base transceiver.

A new coded continuous phase modulation (CPM) scheme is proposed to enhance physical layer performance of the current DVB-RCS standard for a satellite communication system. The proposed CPM scheme uses a phase pulse design and combination of modulation parameters to shape the power spectrum of CPM signal in order to improve resilience to adjacent channel interference (ACI). Additionally, it uses a low complexity binary convolutional codes and S-random bit interleaving. Phase response using the proposed CPM scheme is a weighted average of the conventional rectangular and raised-cosine responses and provides optimum response to minimize frame error rate for a given data rate.

Techniques and mechanisms to provide a motor vehicle with connectivity for satellite communications. In an embodiment, a communication device is disposed between an exterior surface of the motor vehicle and an interior surface of the motor vehicle. An antenna panel, disposed in a housing of the communication device, may be configured to participate in satellite communication via a first side of the communication device. A configuration of the antenna panel, the housing or one or more hardware interfaces of the communication device may facilitate low profile solution for such communication with the satellite. In another embodiment, the one or more hardware interfaces are each disposed on a respective side of the housing other than the first side, the one or more hardware interfaces to couple the communication device to a power supply of a motor vehicle.

A flat antenna for satellite communication includes a radiating board. The radiating board includes at least one radiating line, and an adapter configured to modify the delay of the fields transmitted or received by the radiating line. The adapter includes a horn mobile in rotation between the two metal plates containing a sensor array. The horn is also mobile in rotation between at least one coaxial cable connected between at least one sensor of the network and the radiating line. The length of the coaxial cable is suitable for introducing a delay required to focus the wave radiated by the radiating line.

A flat antenna for satellite communication includes a radiating board. The radiating board includes at least one radiating line, and an adapter configured to modify the delay of the fields transmitted or received by the radiating line. The adapter includes a horn mobile in rotation between the two metal plates, and a multilayer power supply circuit. The first layer of the multilayer power supply circuit is formed at least one metal plate containing an array of slot sensors and the last layer of the multilayer power supply circuit is provided with at least one coupling slot connected to the radiating line. The first layer and the last layer is linked by at least one transmission line. The length of the transmission line is suitable for introducing a delay required to focus the wave radiated by the radiating line.

Mardi Lumsden has a passion for music that tells stories and come from the heart. Fortnightly you can hear her Saturday Breakfast segment 'Saturday tracks' with Phil Smith exploring Brisbane's indie music scene

Satellite images have captured a usually invisible phenomenon known as atmospheric gravity waves pulsing through clouds off Western Australia's north-west.

We’ve reported before on 3D printing technology being used to make parts for satellites and other spacecraft, and this trend looks set to continue in the future, with Thales Alenia Space being one of the major companies leading the way.

Australian scientists have weighed Greenland's ice cap melt using satellite technology and their findings are not good.

The head of the Murray-Darling Basin Authority apologises for mistakenly publishing a report that identified farms via satellite imagery, which is now subject to investigation.

Almost all of the world's cruise ships have formed ghost fleets with their crews trapped aboard

DAY 1 に申し込んでみた✋

In Special Relativity relativity of simultaneity is the fact that 2 simultaneous events occurring in a stationary frame does not appear simultaneous in a moving frame. For example, in Einstein’s train thought experiment 2 simultaneous flashes of light on the platform do not appear simultaneous for the observer in the train. But relativity of simultaneity...

Around the planet, a loosely knit but closely woven band of amateurs monitor the whereabouts of satellites — be they secretive spacecraft, rocket stages, orbital debris or lost space probes.

KIM JONG-UN is building a massive facility outside the capital Pyongyang, satellite images have shown, suggesting he is planning to beef up his stockpile of nuclear weapons.

On February 10, 2020, Express.co.uk published an article headlined "Coronavirus satellite image: Does THIS image show REAL scale of virus cremations?".

In this position you will be developing mechanical space flight hardware, from concept to test, in support of JPL planetary exploration programs at our Pasadena location and will involve interfacing with JPL staff. The candidate will work in teams to design, develop, and test of mechanical and/

One of the hardest tasks in Earth observation is tracking tiny changes in the shape of the ground.

1 June 2012 , Volume 68, Number 4

Eyes in the skies keeping watch on a planet under stress. Click on the PDF link to view the graphic

City planning -- Remote sensing.

The large volumes of Sentinel-1 data produced over Europe are being used to develop pan-national ground motion services. However, simple analysis techniques like thresholding cannot detect and classify complex deformation signals reliably making providing usable information to a broad range of non-expert stakeholders a challenge. Here we explore the applicability of deep learning approaches by adapting a pre-trained convolutional neural network (CNN) to detect deformation in a national-scale velocity field. For our proof-of-concept, we focus on the UK where previously identified deformation is associated with coal-mining, ground water withdrawal, landslides and tunnelling. The sparsity of measurement points and the presence of spike noise make this a challenging application for deep learning networks, which involve calculations of the spatial convolution between images. Moreover, insufficient ground truth data exists to construct a balanced training data set, and the deformation signals are slower and more localised than in previous applications. We propose three enhancement methods to tackle these problems: i) spatial interpolation with modified matrix completion, ii) a synthetic training dataset based on the characteristics of real UK velocity map, and iii) enhanced over-wrapping techniques. Using velocity maps spanning 2015-2019, our framework detects several areas of coal mining subsidence, uplift due to dewatering, slate quarries, landslides and tunnel engineering works. The results demonstrate the potential applicability of the proposed framework to the development of automated ground motion analysis systems.

The company's goal is to launch six to eight additional batches of satellites over the next months so that the broadband service has sufficient coverage for the US market.

Satellites could transfer data directly to Apple's devices and reduce dependency on wireless carriers, Bloomberg reports. It's another sign Apple wishes to replace most outside partners with in-house technologies in the next decade.

Actor Suraj Pancholi will next be seen in the film called Satellite Shankar. He talked to ABP News exclusively and revealed why his film is called Satellite Shankar. He said that the film builds on connections and that whole India is connected towards the end

The launching vehicle of GISAT 1 has evinced much interest before the launch of the mission. GSLV -F10 is a humongously tall vehicle - as tall as a Sixteen storey building, and weighing approximately 4,20,300 kilograms..

As the date of launch nears, Indian Space Research Organisation (ISRO) in a tweet has revealed what it’s geo Imaging Satellite, GISAT-1 can do

Special grade steel plates have been procured from the Bhilai plant of the Steel Authority of India Limited (SAIL) to be used in the launch vehicle.

First and foremost, through the recent COVID-19 crisis, satellite technology is found proving its utility for support.

Despite its proximity to the epicentre of the novel coronavirus pandemic, the company staff worked hard to ensure the success of the mission, state-run Xinhua news agency reported.

As part of its large-scale broadband internet connectivity project Starlink, the company has positioned many large satellites in the lower orbits of the Earth.

Japan will launch its first space operations unit within the Air Self-Defense Force on May 18 to monitor threats to Japanese satellites in outer space, ...

AI can check satellite images of the ocean and distinguish between floating materials such as seaweed or plastics, which could help clean-up efforts

Background

Fluid overload in patients undergoing hemodialysis contributes to cardiovascular morbidity and mortality. There is a global trend to lower dialysate sodium with the goal of reducing fluid overload.

An AI search engine takes one-tenth of a second to search more than 2 billion satellite images, identifying natural or built features that look alike, such as forests or military bases

AI can check satellite images of the ocean and distinguish between floating materials such as seaweed or plastics, which could help clean-up efforts

Huge constellations of satellites like SpaceX’s Starlink could make ground-based astronomy impossible, and we’re running out of time to deal with the problem

China has connected the world’s first portable ground station for quantum communication to the Mozi satellite, and has plans to launch another quantum satellite soon

The International Astronomical Union has concluded a review of satellite mega constellations such as SpaceX's Starlink satellites and found they will have a major impact on large telescopes, but not naked eye astronomy