Satellite Application Notes and White Papers

  1. LTE Location Based Services Technology Introduction 7/5/2016

    Global Navigation Satellite System (GNSS) based solutions are highly accurate in most cases, but there are circumstances where they are not as effective, such as in dense urban environments with reduced satellite visibility or indoor areas with low signal levels. LTE Location Based Services (LBS) are designed to determine where a device is located to assist in its effectiveness. This Rohde & Schwarz white paper describes limitations of GNSS systems, as well as LTE cellular based alternatives within 3GPP Release 9.

  2. Measuring And Monitoring Satellite Signals 2/27/2014

    This application note describes example measurement principles that cover the above-mentioned applications and for which the NRA range of spectrum analyzers from Narda is particularly suitable.

  3. A New Generation Of Gallium Nitride (GaN) Based Solid State Power Amplifiers For Satellite Communication 1/10/2014

    The introduction of Gallium Nitride High Electron Mobility Transistors (GaN HEMT) in early 2000 has left an undeniable mark on the entire satellite communication landscape. It is now possible for the first time since the introduction of the Solid State Microwave Technology to design and manufacture Power Amplifiers that exceed by several orders of magnitude the reliability, linearity, power density and energy efficiency of all existing technologies, being GaAs, LDMOS, or TWT. By C. Damian, VP Product Line Management and Business Development, and D. Gelerman, President and CEO, Advantech Wireless Inc.

  4. Using The Q/V Band For Satellite Feeder Links 12/13/2013

    A key limitation of current Ka-band systems is the simultaneous use of Ka-band for both revenue generating user links and backhaul feeder links. The 40 and 50 GHz bands provide opportunity to move commercial high throughput satellite feeder links out of Ka band.

  5. Using the IQC5000A and Spectro-X Software for Signal Capture and Analysis: A Satcom Example 12/10/2013

    This application note discusses how a spectrum capture and playback system can be used to predict and measure bandwidth, and its advantages over traditional signal analyzers for the same application.

  6. High Gain Phototransistor Optocouplers For Space Applications 7/18/2013

    One of the first optocouplers used for high reliability applications was the simple phototransistor optocoupler. The basic devices were the 4N22, 23, 24 and the 4N47, 48, 49 series of hermetic phototransistor optocouplers in TO‐five type transistor cans made for military applications developed in the early 1970s. However, these devices were never designed specifically for space radiation environments. By Steve Ching and Manor Narayanan, Isolink, a subsidiary of Skyworks Solutions, Inc.

  7. Photonic Links Allow MILSATCOM And RF Distribution Networks To Leverage Optical Communication Infrastructure 10/21/2011

    The proliferation of and reliance on RF systems has necessitated the need for robust, secure, and distributed network topologies. As a result, the defense industry is incorporating optical fiber cabling in lieu of coaxial cables or waveguides within major communications and weapons systems.

  8. Backhaul Infrastructure For Critical Satellite Based Continuity Of Communications Solutions 10/21/2011
    The ever present threats from terrorism and natural disasters have brought to the forefront a renewed focus on emergency backup communications strategies and solutions for federal, state, and commercial enterprises. Otherwise known as Continuity Of Communications, organizations worldwide are instituting initiatives to seek and develop the means by which to achieve rapidly deployable and robust systems in support of Infrastructure Security, Disaster Relief and Emergency Preparedness.
  9. Electromagnetic Analysis Of An Antenna Mounted On A Satellite Platform 9/30/2009
    This article deals with the analysis of a complex antenna mounted on a satellite platform. The geometry of an Iridium satellite is considered, of which a constellation of 66 are at present employed in providing a global mobile communication service. The article gives readers an understanding of the present capabilities of CEM tools in relation to computational resources when dealing with real-world aerospace applications. By Matthys M. Botha and Ernst H. Burger, EM Software & Systems
  10. White Paper: Compatibility Of Services Using WiMAX Technology With Satellite Services In The 2.3 To 2.7 GHz And 3.3 To 3.8 GHz Bands 6/3/2009
    WiMAX system profiles currently consider use of the frequency bands 2.3 to 2.7 GHz and 3.3 to 3.8 GHz which also have ITU frequency allocations for satellite services. The purpose of this article from the WiMAX Forum is to provide background on the satellite-related issues that relate to co-existence with wireless access services in these two bands and address the interference scenarios that can occur. By the WiMAX Forum