Space-Frequency-Interpolated Radio Map

Chapter 5 Frequency Space Environment Map Rendering

In the previous chapter on irradiance environment maps, we have seen how frequencyspace analysis can be used to efficiently compute and represent convolutions of the incident illumination with the low-pass Lambertian reflection function, i.e. clamped cosine. An obvious question is whether a similar approach is possible for general BRDFs. In this chapter, we will present such a method. We will t...

Radio-frequency clock delivery via free-space frequency comb transmission.

We characterize the instability of an rf clock signal caused by free-space transmission of a frequency comb (FC) under typical laboratory conditions. The phase-noise spectra show the involvement of multiple random processes. For a 10 m transmission, the rms timing jitter integrated over 1-10(5) Hz is 95 fs, and the root Allan variance over 1 s is 4x10(-13). The measured Allan variance has a tau...

Space Shuttle Space Station Radio Frequency ( W ) Exposure Analysis

This paper outlines the modeling techniques and important parameters to define a rigorous but practical procedure that can verify the compliance of RF exposure to the NASA standards for astronauts and electronic equipment. The electromagnetic modeling techniques are applied to analyze RF exposure in Space Shuttle and Space Station environments with reasonable computing time and resources. The m...

An Interpolated Accent Map for Scotland

Radio Frequency Identification Encryption via Modified Two Dimensional Logistic Map

Abstract—A modified two dimensional (2D) logistic map based on cross feedback control is proposed. This 2D map exhibits more random chaotic dynamical properties than the classic one dimensional (1D) logistic map in the statistical characteristics analysis. So it is utilized as the pseudo-random (PN) sequence generator, where the obtained real-valued PN sequence is quantized at first, then appli...