Download Antennas for Global Navigation Satellite Systems by Xiaodong Chen, Clive G. Parini, Brian Collins, Yuan Yao, PDF

By Xiaodong Chen, Clive G. Parini, Brian Collins, Yuan Yao, Masood Ur Rehman

Content material:
Chapter 1 basics of GNSS (pages 1–19):
Chapter 2 primary issues for GNSS Antennas (pages 21–40):
Chapter three satellite tv for pc GNSS Antennas (pages 41–53):
Chapter four Terminal GNSS Antennas (pages 55–80):
Chapter five Multimode and complex Terminal Antennas (pages 81–110):
Chapter 6 Terminal Antennas in tricky Environments (pages 111–148):
Chapter 7 Human consumer results on GNSS Antennas (pages 149–180):
Chapter eight cellular Terminal GNSS Antennas (pages 181–206):

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Extra resources for Antennas for Global Navigation Satellite Systems

Sample text

1 Navigation Antenna Requirements This chapter will take an overview of the antenna requirements and design techniques used for the spacecraft segment of the GPS system. Although the antenna farms are complex high-value systems, the antenna designer can infer useful techniques that can be translated into constructing specialised GNSS user antennas. 1 shows the level of complexity of an antenna farm for the GPS III satellite. A typical spacecraft antenna farm consists of a number of antenna systems including: • • • • L-band downlink array that provides the L1, L2 and L5 navigation signals.

1 GPS III antenna farm (Lockheed Martin). the centre of the array structure. 3 [2]. The high-band element is a circular ring patch with two notches to achieve circular polarisation from a single coaxial feed point. The low-band element is excited by a pair of coaxial probes fed in quadrature to achieve the circular polarisation. An additional patch between the two elements acts as a ground plane for the high-band antenna. Between the metallic layers is a lightweight foam spacer, and each coaxial feed point includes a capacitive gap to improve matching.

Maximising the received signal using LP or elliptically polarised (EP) antennas requires the receiving antenna to be correctly aligned relative to the direction of propagation. Using RHCP antennas at the satellite and at the receiver means that no polarisation alignment is needed. Secondly, a CP wave is capable of combating Faraday rotation in the ionosphere. If an LP wave is adopted, the signal becomes EP or even CP after passing through ionosphere, so an LP antenna on the receiver can only pick up a fraction of the incoming signal.

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