Download e-book for kindle: Antenna Arraying Techniques in the Deep Space Network (JPL by David H. Rogstad, Alexander Mileant, Timothy T. Pham

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

ISBN-10: 0471467995

ISBN-13: 9780471467991

An advent to antenna Arraying within the Deep area networkAntenna arraying is the combining of the output from a number of antennas as a way to increase the signal-to-noise ratio (SNR) of the got sign. Now applied on the Goldstone complicated and different Deep area community (DSN) abroad amenities, antenna arraying offers versatile use of a number of antennas to extend info premiums and has enabled NASA's DSN to increase the missions of a few spacecraft past their deliberate lifetimes.Antenna Arraying strategies 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 history; describes key strategies and methods; analyzes and compares numerous equipment of arraying; discusses numerous correlation concepts used for acquiring the mixed weights; offers the result of numerous arraying experiments; and indicates instructions for destiny work.An vital contribution to the clinical literature, Antenna Arraying innovations within the Deep house community* was once commissioned through the JPL Deep area Communications and Navigation structures (DESCANSO) heart of Excellence* Highlights many NASA-funded technical contributions referring to deep area communications platforms* is part of the celebrated JPL Deep area Communications and Navigation SeriesThe Deep house Communications and Navigation sequence is authored through scientists and engineers with vast event in astronautics, communications, and similar fields. It lays the basis for innovation within the parts of deep area navigation and communications by means of disseminating cutting-edge wisdom in key applied sciences.

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Extra info for Antenna Arraying Techniques in the Deep Space Network (JPL Deep-Space Communications and Navigation Series)

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The array availability starts with a value much below the element availability, but increases rapidly and surpasses the element availability for a margin of less than about 30 percent, or 1 dB. The rate of increase of array availability is faster for arrays with a larger number of elements, even though it starts with a much smaller value. At some point as the sparing level increases, all the arrays with different numbers of elements reach approximately the same availability, beyond which a given sparing results in higher availability for larger arrays than for smaller arrays.

For antennas separated by a large distance, the carrier-lock information must be corrected for different geometries. Estimates of the delay offsets normally are accomplished by correlating the signal streams from the various antennas. Table 4-1 summarizes the requirements for each of the five types of arraying. Some of these are discussed in more detail in Chapter 6. Carrier Tracking Subcarrier Demodulation Symbol Sync CarrierAided Signal (Corrected) Symbol Combiner Carrier Tracking Subcarrier Demodulation Fig.

This allows transmission of a residual-carrier component whose frequency does not coincide with the data spectrum and, therefore, minimizes interference between the two. At the receiver, the deep-space signal is demodulated using a carrier-tracking loop, a subcarrier-tracking loop [2], and a symbol-synchronizer loop [3], as shown in Fig. 5-1. Depending on the modulation index, carrier tracking can be achieved by a phase-locked loop (PLL), Costas loop, or both [4]. The PLL or a combination of loops is used for modulation indices less than 90 deg, whereas a Costas loop is used when the modulation index is 90 deg.

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Antenna Arraying Techniques in the Deep Space Network (JPL Deep-Space Communications and Navigation Series) by David H. Rogstad, Alexander Mileant, Timothy T. Pham

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