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Download PDF by David H. Rogstad, Alexander Mileant, Timothy T. Pham: Antenna arraying techiques in the deep space network

By David H. Rogstad, Alexander Mileant, Timothy T. Pham

ISBN-10: 0471467995

ISBN-13: 9780471467991

An advent to antenna Arraying within the Deep area community Antenna arraying is the combining of the output from a number of antennas with the intention to increase the signal-to-noise ratio (SNR) of the bought sign. Now applied on the Goldstone advanced and different Deep area community (DSN) in another country amenities, antenna arraying presents versatile use of a number of antennas to extend facts premiums and has enabled NASA's DSN to increase the missions of a few spacecraft past their deliberate lifetimes. Antenna Arraying recommendations within the Deep house community introduces the advance and use of antenna arraying because it is carried out within the DSN. Drawing at the paintings of scientists at JPL, this well timed quantity summarizes the improvement of antenna arraying and its historic historical past; describes key recommendations and strategies; analyzes and compares numerous tools of arraying; discusses numerous correlation ideas used for acquiring the mixed weights; offers the result of numerous arraying experiments; and indicates instructions for destiny paintings. a big contribution to the clinical literature, Antenna Arraying concepts within the Deep house community * was once commissioned by way of the JPL Deep house Communications and Navigation platforms (DESCANSO) heart of Excellence * Highlights many NASA-funded technical contributions touching on deep house communications structures * is part of the celebrated JPL Deep area Communications and Navigation sequence The Deep area Communications and Navigation sequence is authored via scientists and engineers with broad adventure in astronautics, communications, and similar fields. It lays the basis for innovation within the components of deep house navigation and communications through disseminating state of the art wisdom in key applied sciences.

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Console passwords enable password phenoelit ! Ud75tps/nQj0 ! Enable passwords enable password phenoelit ! Enable secrets 42410C150C03 ! Recalculate checksum ! Reboot Config modification code ! Advantages ! Image independent ! Configuration preserved ! More choices of what to do ! Disadvantages ! Depending on platform ! Router has to reboot once So what? The community gains increasing experience in exploiting IOS bugs ! IOS has still no internal protections ! Features are still added to the old code tree !

HTTP Overflow ! Direct frame pointer and return address overwrite What we can do now ! Send full binary shell code ! Calculate the address of the code using IO memory block header information ! Select the shell code that is most likely not modified ! Directly redirect execution in the provided shell code ! Own the box Combining 1. Send the maximum URL length allowed by IOS 2. Send 2GB of additional URL elements in correct sized chunks 3. Perform UDP memory leak several times with shell code in the request packet 4.

Find beginning of configuration in NVRAM ! Find occurrences of “\n password “ “\nenable “ ! Replace occurrences with your “data” ! Hereby replace authentication information for ! ! Console passwords VTY line passwords Enable passwords Enable secrets ! Recalculate checksum ! Reboot Config modification code nsagw1#sh startup-config Using 857 out of 7506 bytes ! Find beginning of configuration in NVRAM ! 3 “\n password “ service password-encryption “\nenable “ service udp-small-servers !! Replace occurrences with your “data” hostname nsagw1authentication information for !

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Antenna arraying techiques in the deep space network by David H. Rogstad, Alexander Mileant, Timothy T. Pham


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