A Time Modulated Array Antenna System with Adaptive Anti-Doppler Frequency Offset

Abstract

The invention discloses a self-adaption Doppler frequency offset resisting time modulation array antenna system which comprises an antenna array subsystem, a radio frequency switch network subsystem and a field programmable gate array (FPGA) control subsystem. The antenna array module is formed by four pairs of identical printing dipole subunits (1) which are in serial feed. The radio frequency switch network module is composed of four one-bit phase shifters (2) and a one-in-four power divider combiner (3). A speed collection unit (11) composed of a uniaxial accelerometer and an integrator is integrated on an FPGA control plate (9) of the FPGA control subsystem to acquire relative speed information of the current environment. Control sequences of switches on the corresponding phase shifter (2) can be calculated through the information, and work states of the phase shifters can e changed by controlling a signal transmission line (8). The system has the Doppler frequency offset compensation function, has the self-adaption advantage, can control a beam to point at an appointed communication target and is applied to the fields of high speed railway communication and the like.

Description

technical field [0001] The invention belongs to the technical field of antenna engineering and relates to the technical field of high-speed railway communication, in particular to an adaptive anti-Doppler frequency offset time modulation array antenna system. Background technique [0002] In recent years, with the popularization of high-speed railways all over the world, especially in China, the wireless communication of mobile devices on trains has become an urgent problem to be solved. Since the existing communication system and the next-generation communication system that will be put into use cannot support the high-speed movement of the train at 350km / h or even 500km / h in the future, how to make the existing hardware equipment support the broadband high-speed communication system has become a high-speed railway communication problem A hot spot of research. [0003] The channel characteristics of high-speed mobile trains include (1) multipath propagation and multipath f...

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Problems solved by technology

However, at present, my country's railway infrastructure construction is relatively complete, and the above-mentioned scheme means a huge investment in infrastructure construction or a large-scale upgrade or even redesign of the existing communication system

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