By Jon Hamkins, Marvin K. Simon, Joseph H. Yuen
This e-book introduces the reader to the concept that of an self sufficient software-defined radio (SDR) receiver. every one particular point of the layout of the receiver is taken care of in a separate bankruptcy written by means of a number of top innovators within the box. Chapters commence with an issue assertion after which provide an entire mathematical derivation of a suitable resolution, a call metric or loop-structure as acceptable, and function effects.
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Extra resources for Autonomous software-defined radio receivers for deep space applications
2-2. The digital AGC error signal, EAGC , is generated from the CTL armﬁlter outputs, I and Q, via EAGC = Kgain · (1 − I 2 + Q2 ) (2 1) where Kgain controls the time constant of the AGC as well as the variance of the resulting amplitude gain estimate. Note that Kgain is the only programmable AGC constant. Typically, Kgain = 2−15 provides a reasonable compromise between a fast AGC response time (<10 ms) and a low noise gain estimate. The AGC error signal, Eq. (2-1), is chosen such that the AGC forces the complex magnitude of the CTL arm-ﬁlter outputs, I 2 + Q2 , to be unity on average.
The problem with commercial-based solutions is that they are high-power, high-mass, and singleapplication-oriented; achieve low levels of integration; and are designed for a benign operating environment. The problem with the mission-speciﬁc designs is that the resultant short-range communication systems do not provide the performance and capabilities to make their use for other missions desirable. , balloons, gliders, probes). , Moonrise), etc. To this end, Electra has been designed to be compatible with the Proximity-1 Space Link Protocol .
Doppler aﬀects carrier and timing parameters. The angle of arrival, symbol timing, and carrier phase are also modeled in the channel component of the dependency graph shown in Fig. 1-1. 1 A Conventional Radio Receiver A functional block diagram of a radio receiver and decoder is shown in Fig. 1-2. Factors that are known a priori in a conventional radio are shown in ellipses, while the tasks it performs are shown in rectangles. A conventional radio receiver has complete a priori knowledge of the signal-dependent factors relating to the FEC encoder and modulator/ampliﬁer components shown in Fig.
Autonomous software-defined radio receivers for deep space applications by Jon Hamkins, Marvin K. Simon, Joseph H. Yuen