Phased array transmitting system of RSU based on DDS

Abstract

The invention provides a DDS-based RSU phased array transmitting system, which is characterized by comprising an RSU processor module, a transmitting signal processor module, a DDS intermediate frequency signal generation module, a reference clock module, an intermediate frequency signal processing module, an up-conversion module, a local oscillator module, a radio frequency signal processing module and an antenna array module, the transmitting signal processor module is connected with the RSU processor module, realizes parameter configuration, receives a baseband IO level signal of the RSU processor module through IO, and transmits the baseband IO level signal to the RSU processor module; the emission signal processor module, the DDS intermediate frequency signal generation module, the intermediate frequency signal processing module, the up-conversion module, the radio frequency signal processing module and the antenna array module are connected in sequence, and the reference clock module is connected with the DDS intermediate frequency signal generation module. According to the DDS-based RSU phased array transmitting system, the problems of ETC adjacent channel interference and vehicle following interference can be well solved, and the material cost of the RSU is reduced.

Description

technical field [0001] The invention relates to a phased array launch system, in particular to a DDS-based RSU phased array launch system in the field of ETC. Background technique [0002] ETC: (Electronic Toll Collection) non-stop toll collection system is the most advanced road and bridge toll collection method in the world at present, through the special microwave short-range between the vehicle electronic tag installed on the vehicle windshield and the microwave antenna on the ETC lane of the toll station Communication, deducting the amount on the user card or using computer networking technology to carry out background settlement processing with the bank, so as to achieve the purpose of paying road and bridge tolls without stopping when vehicles pass through road and bridge toll stations. ETC is an advanced electronic toll collection technology. At the entrance and exit of the ramp and the sign station of the main line, both are ETC application models in the closed expr...

AI Technical Summary

Problems solved by technology

[0006] With the application and promotion of ETC, there are more and more ETC parallel lanes, and the problems of ETC adjacent lane interference and car-following interference have become more prominent, which has been plagued by the development of ETC. In order to better dynamically control the transmission beam range of RSU, a Analog phased array transmit beam scanning technology, the phased array transmit beam scan is realized by controlling the phase and amplitude of the multi-channel 5.8G frequency band RF signal, the phase is controlled by a phase shifter, and the amplitude is controlled by an attenuator; However, the 5.8G band phase shifter and attenuator are very expensive, and each channel needs to be used, which greatly increases the BOM cost of the RSU

[0007] In addition, phase shifters and attenuators use limited steps (usually less than or equal to 64 levels) to phase shift and attenuate the signal, which cannot achieve precise phase shift and precise amplitude modulation, so it is difficult to precisely adjust the beam. In order to solve Above-mentioned technical problem, the present application provides a kind of phased array transmitting system of RSU based on DDS

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