Link feasibility analysis for a satellite system operating at L-band integrated with the GSM network

2002 ◽  
Author(s):  
F. Delli Priscoli ◽  
F. Muratore
Keyword(s):  
Satellite System ◽  
Feasibility Analysis ◽  
Gsm Network ◽  
L Band ◽  
System Operating

A Hybrid System for World-wide Navigation

1970 ◽  
Vol 23 (1) ◽  
pp. 26-44 ◽  
Author(s):  
F. S. Stringer
Keyword(s):  
Navigation System ◽  
Short Range ◽  
World Wide ◽  
Dead Reckoning ◽  
Satellite System ◽  
System Study ◽  
Sources Of Information ◽  
Multiple Sensors ◽  
Omega System ◽  
System Operating

In 1963, in addition to examining the characteristics of the Omega system, we were also very concerned with a comprehensive navigation system study which was designed to examine all aspects of a world-wide navigation system operating in a B.O.A.C. type environment. This concerned a study of dead reckoning as well as externally referenced sources of information. You have the choice of an all dead reckoning system probably employing multiple sensors of the same type, triple IN is typical, or you could have a mixture of externally referenced and self-contained, in other words dead reckoning sensors. Occasional reference could be made to short-range aids or even a satellite system if available to increase the integrity of the position-fixing information. The inertial and computer aspects have been examined by the Avionics Department at R.A.E. whereas the radio sensors, which are externally referenced, and the relevant software have been the responsibility of the Radio Department.

scholarly journals Accuracy Assessment of Atlas L-band GNSS Global Correction Service and Autonomous Positioning at Perlis, Malaysia

2021 ◽  
Vol 18 (2) ◽  
pp. 57
Author(s):  
Mohd Zainee Zainal ◽  
Wan Muhammad Syafiq Wan Mohd Suhaimi ◽  
Nurul Ain Mohd Zaki ◽  
Noorzalianee Noorzalianee Ghazali ◽  
Khairulazhar Zainuddin
Keyword(s):  
Precise Point Positioning ◽  
Accuracy Assessment ◽  
Satellite System ◽  
Maritime Industry ◽  
Signal Loss ◽  
Positioning Method ◽  
L Band ◽  
Global Navigation Satellite ◽  
Classification Table ◽  
Average Position

Differential Global Navigation Satellite System (DGNSS) is the most common positioning method used for navigation in the hydrography field. During the loss of the correction signal, the differential solution becomes an autonomous solution that may affect the accuracy of the position during that time. However, the availability of the Atlas L-band global correction service that adapts the Real-Time Precise Point Positioning (RT-PPP) technique has broadened the choice of solutions that can be used for navigation in the maritime industry and may solve the problem of signal loss. This research compares the positioning between autonomous solution GNSS and Atlas L-band correction solution using the static method to assess the accuracy of positioning between both methods. Data acquisition of the autonomous positioning and Atlas L-band service was conducted by using Hemisphere receiver VS330 and antenna A43. The statistical T-test reveals that the accuracy of analysis Atlas-L band and autonomous solution GNSS using static positioning was significant, as the p < 0.05 with 95% confidence interval. Besides, the result also shows that the position given by the Atlas L-band is more accurate and precise than Autonomous Solution GNSS, with an average position of 0.479 meters and 2.281 meters, respectively. Ultimately, the continuity of positioning data given by the Atlas L-band in the northern part of Malaysia is good, and positioning using Atlas L-band can be classified as Special Order based on the classification table by the International Hydrographic Organisation (IHO). Keywords: Atlas L-Band, GNSS, RT-PPP, Autonomous Positioning

scholarly journals Assessing L-Band GNSS-Reflectometry and Imaging Radar for Detecting Sub-Canopy Inundation Dynamics in a Tropical Wetlands Complex

2018 ◽  
Vol 10 (9) ◽  
pp. 1431 ◽  
Author(s):  
Katherine Jensen ◽  
Kyle McDonald ◽  
Erika Podest ◽  
Nereida Rodriguez-Alvarez ◽  
Viviana Horna ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Large Scale ◽  
Time Series Data ◽  
Leading Edge ◽  
Satellite System ◽  
Series Data ◽  
Tropical Wetlands ◽  
Forest Canopies ◽  
Imaging Radar ◽  
L Band

Despite the growing number of remote-sensing products from satellite sensors, mapping of the combined spatial distribution and temporal variability of inundation in tropical wetlands remains challenging. An emerging innovative approach is offered by Global Navigation Satellite System reflectometry (GNSS-R), a concept that takes advantage of GNSS-transmitting satellites and independent radar receivers to provide bistatic radar observations of Earth’s surface with large-scale coverage. The objective of this paper is to assess the capability of spaceborne GNSS reflections to characterize surface inundation dynamics in a complex wetlands environment in the Peruvian Amazon with respect to current state-of-the-art methods. This study examines contemporaneous ALOS2 PALSAR-2 L-band imaging radar, CYGNSS GNSS reflections, and ground measurements to assess associated advantages and challenges to mapping inundation dynamics, particularly in regions under dense tropical forest canopies. Three derivatives of CYGNSS Delay-Doppler maps (1) peak signal-to-noise ratio (SNR), (2) leading edge slope, and (3) trailing edge slope, demonstrated statistically significant logarithmic relationships with estimated flooded area percentages determined from SAR, with SNR exhibiting the strongest association. Aggregated Delay-Doppler maps SNR time series data examined for inundated regions undetected by imaging radar suggests GNSS-R exhibits a potentially greater sensitivity to inundation state beneath dense forest canopies relative to SAR. Results demonstrate the capability for mapping extent and dynamic wetlands ecosystems in complex tropical landscapes, alone or in combination with other remote-sensing techniques such as those based on imaging radar, contributing to enhanced mapping of these regions. However, several aspects of GNSS-R observations such as noise level, spatial resolution, and signal coherence need to be further examined.

Stacked Tri-Band Circularly Polarized Microstrip Patch Antenna for CNSS Applications

2013 ◽  
Vol 347-350 ◽  
pp. 1786-1789
Author(s):  
Kang Ding ◽  
Tong Bin Yu ◽  
Dong Fang Guan ◽  
Cheng Peng
Keyword(s):  
Patch Antenna ◽  
Microstrip Antenna ◽  
Axial Ratio ◽  
Satellite System ◽  
Microstrip Patch Antenna ◽  
Antenna Design ◽  
Circularly Polarized ◽  
Microstrip Patch ◽  
L Band ◽  
Compass Navigation

This paper proposes a novel stacked tri-band circularly polarized antenna which has three independent ports. To obtain tri-band operation, a stacked three layers of microstrip antenna working at different frequency is presented. Each of them is fed by dual feed probes. The simulated results show that the antenna can cover Compass Navigation Satellite System CNSS B3 1.268 GHz, L band 1.615 GHz and S band 2.49 GHz. The proposed antenna has achieved a bandwidth of 3.1%, 6.8% and 2.3% at each band, respectively. It exhibits small axial ratio under 3dB in three bands for the CNSS applications. Details of the proposed antenna design and results for the obtained tri-band circularly polarized performances are presented and discussed.

scholarly journals DESAIN AWAL SISTEM SATELIT TELEKOMUNIKASI PERTAHANAN INDONESIA (PRELIMINARY DESIGN OF INDONESIAN MILITARY TELECOMUNICATION SATELLITE)

2017 ◽  
Vol 14 (2) ◽  
pp. 113
Author(s):  
Robertus Heru Triharjanto ◽  
Luqman Faturrohim ◽  
Ridanto Eko Poetro ◽  
Hari Muhammad
Keyword(s):  
Mobile Communications ◽  
Data Communication ◽  
Satellite System ◽  
Preliminary Design ◽  
Concept Design ◽  
Power Capacity ◽  
Satellite Mission ◽  
Design Constraints ◽  
Telecommunication Satellite ◽  
L Band

As the biggest archipelago in the world, Indonesia really needs satellite system to support its defense and security. Based on that, this research aims to produce the preliminary design of telecommunication satellite system needed for defense and security campaign in Indonesia. Per best practice in aerospace engineering, the satellite preliminary design is preceded by a satellite concept design. In the concept design process, the users’ requirements, in this case, the Indonesian military, are studied, and comparative study is done for military telecommunication satellite solution that other countries used. The results are the satellite mission requirements, and design constraints to be used in the satellite preliminary design. The preliminary design shows that 2 kinds of satellites are needed to accommodate the mission requirements. i.e. L-band for mobile communications and C-band for fixed-high-datarate communication. Based on the available slots and the design constraints, the L-band satellite will be placed at 123 E. The satellite will weigh 2200 kg, has a power capacity of 1 kW, and can provide data communication with the speed of 512 kbps. The C-band satellite, that will be placed at 118 E, will weigh 2400 kg, has power capacity of 1.5 kW, and can provide data communication with the speed of 10 Mbps. Both satellites can operate for 10 years. Abstrak:Indonesia sebagai negara kepulauan terluas di dunia amat memerlukan sistem satelit untuk menunjang sistem pertahanan dan keamanannya. Atas motivasi tersebut penelitian ini bertujuan untuk membuat desain awal sistem satelit telekomunikasi yang diperlukan untuk pertahanan dan keamanan di Indonesia. Sesuai kaidah perancangan satelit, proses desain awal didahului dengan pembuatan desain konsep. Pada proses desain konsep dilakukan pendefinisikan kebutuhan penggguna, dalam hal ini pihak TNI dan Kementerian Pertahanan, dan studi banding atas solusi satelit telekomunikasi pertahanan di mancanegara. Hasil desain konsep adalah persyaratan misi dan batasan desain, yang harus diacu pada tahap desain awal satelit. Desain awal, diantaranya, menetapkan desain muatan sehingga dapat mengakomodasikan misi, serta ukuran dan berat dari bus satelit, agar bisa memenuhi kebutuhan muatan. Hasil menunjukkan bahwa pemenuhan desain konsep hanya bisa dilakukan dengan desain awal 2 tipe satelit telekomunikasi, yakni dengan frekuensi L-band untuk komunikasi bergerak, dan frekuensi C-band untuk komunikasi statis dengan kecepatan tinggi. Sesuai ketersediaan slot yang menjadi batasan desain, satelit L-band akan ditempatkan di 123 BT. Satelit tersebut mempunyai berat 2200 kg, konsumsi daya 1 kW, dan dapat melayani komunikasi data dengan kecepatan 512 kbps. Satelit C-band, yang akan berada di 118 BT, mempunyai berat 2400 kg, kapasitas daya 1.5 kW, dan dapat melayani komunikasi data dengan kecepatan 10 Mbps. Kedua satelit tersebut dapat beroperasi selama 10 tahun.

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