Advances in Satellite Communications by M. Karimi, Y. Labrador

By M. Karimi, Y. Labrador

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D. & Williamson J. C. (1948). Characteristic of helical antennas radiating in the axial mode, Journal of Applied Physics, Vol. 19, No. 1, (January 1948), pp. 87-96, ISSN 00218979 Kraus, J. D. (1949). The helical antenna, Proceedings of IRE, Vol. 37, No. 3, (March 1949), pp. 263-272, ISSN 0096-8390 Kraus, J. D. (1988). Antennas (2nd ed), McGraw-Hill Companies, ISBN 978-0070354227, New Delhi, India Lan, C. , Chang, T. H. & Kiang, J. F. (2004). Helical antenna for GPS applications, Proceedings of IEEE Antennas and Propagation Society International Symposium, ISBN 07803-8302-8, June 2004.

Fig. 13. BER derived from the average received intensity in the uplink for various beam radius at the transmitting antenna w0 as a function of Eb /N0 . Theoretical Analysis of Effects of Atmospheric Turbulence Bit ofError Rate for Satellite in Ka-band Theoretical Analysison of Effects Atmospheric Turbulence on Bit Error Communications Rate for Satellite Communications in Ka-band Fig. 14. 2 m. Fig. 15. 5 m. 47 19 48 20 Fig. 16. 0 m. Fig. 17. 5 m. Advances in Satellite Communications Will-be-set-by-IN-TECH Theoretical Analysis of Effects of Atmospheric Turbulence Bit ofError Rate for Satellite in Ka-band Theoretical Analysison of Effects Atmospheric Turbulence on Bit Error Communications Rate for Satellite Communications in Ka-band 49 21 beam spot size at the plain of the receiving antenna becomes smaller as w0 increases.

0 × 10−10 m−2/3 Outer scale of turbulence: L0 100 m Inner scale of turbulence: l0 1 mm Table 1. Parameters used in analysis. where h1 = 50 m, h2 = 2, 000 m, ht = 20, 000 m, hs1 = 2 m and hs2 = 1, 750 m. Fig. 0 × 10−10 m−2/3 vertical profile of the refractive index structure constant. We assume Cn0 by referring to the profile of the standard deviation value obtained by Reference (Vasseur, 1999). We set L0 = 100 m and l0 = 1 mm. Table 1 shows parameters used in analysis. 5 Modulus of complex degree of coherence Using the second moment of received waves, we examine the loss of spatial coherence of received waves on the aperture of a receiving antenna by the modulus of the complex degree of coherence (DOC) (Andrews & Phillips, 2005) defined by DOC(ρ, z) = M11 (0, ρ, z) , [ M11 (ρ/2, 0, z) M11 (−ρ/2, 0, z)]1/2 (30) where ρ = |ρ| is the separation distance between received wave fields at two points on the aperture as shown in Fig.

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