9 research outputs found
Spacecraft mass trade-offs versus radio-frequency power and antenna size at 8 GHz and 32 GHz
The purpose of this analysis is to help determine the relative merits of 32 GHz over 8 GHz for future deep space communications. This analysis is only a piece of the overall analysis and only considers the downlink communication mass, power, and size comparisons for 8 and 32 GHz. Both parabolic antennas and flat-plate arrays are considered. The Mars Sample Return mission is considered in some detail as an example of the tradeoffs involved; for this mission the mass, power, and size show a definite advantage of roughly 2:1 in using the 32 GHz over 8 GHz
Estimation of signal-to-noise ratios
Statistical method estimates signal-to-noise ratios in an observed random voltage, such as the output of a telemetry receiver. Signals from a distant transmitting source, overlaid by noise signals, are monitored continuously
Signal-to-noise ratio estimating by taking ratio of mean and standard deviation of integrated signal samples Patent
Automatic estimation of signal to noise ratio and other parameters in signal communication system
The probability density function of a hardware performance parameter
Probability density function of hardware performance parameter and incentive contractin
A multiple-access satellite relay system for low data rate users
Multiple access satellite relay system for low data rate user