OBU positioning device

Abstract

The invention provides an OBU positioning device which is characterized in that the OBU positioning device comprises a digital processing board, a multichannel signal processing board and a microstrip antenna board, the digital processing board is connected with an RSU main processor through a network port or a serial port, the digital processing board is connected with the multichannel signal processing board through an SPI interface, the multi-channel signal processing board is connected with the microstrip antenna board through a radio frequency connector or a coaxial cable, the digital processing board controls the microstrip antenna board to realize time division multiplexing of beam incident angle positioning in X and Y directions, the multi-channel signal processing board converts a multi-channel radio frequency signal into a multi-channel analog intermediate frequency signal, and the multi-channel analog intermediate frequency signal is used for transmitting the multi-channel analog intermediate frequency signal to the microstrip antenna board. According to the OBU positioning device, the hardware of the signal processing circuit is only 1 / 2 of the original hardware, the size is reduced, and the cost is saved; the adjustable range of the receiving sensitivity is larger than 40dB, and the probability of large positioning errors or errors caused by adjacent channel signals or small signals is reduced; and the positioning precision is higher.

Description

technical field [0001] The invention relates to a positioning device, in particular to an OBU positioning device 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. 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 expressway toll scene. With the reform of the national expressway policy, it is imminent to provide faster traffic speed and higher traffic efficiency. Free flow expressway The road toll mode has high tr...

AI Technical Summary

Problems solved by technology

In order to solve ETC adjacent channel interference and car-following interference, OBU positioning technology has emerged. OBU positioning technology processes the array signal received by multiple channels, and then estimates the direction of arrival (DOA) through an algorithm to calculate the position of the OBU. However, The existing technical solutions still have the following problems: 1. Independent hardware channels are used in the X and Y directions, which requires a large number of channels, large volume, and high cost; 2. Adjacent channel signals or small signals are likely to cause large positioning errors or Positioning error: When the receiving and decoding is correct, the positioning result is latched so that the positioning result corresponds to the decoded data frame one by one

The main reason for the above problems is that the receiving and decoding microstrip antenna is the same as the positioning microstrip antenna, which is a single-element microstrip antenna, so the directivity is poor, it has no ability to suppress the adjacent channel, and it is easy to receive adjacent channel signals; the receiving sensitivity can be improved. The adjustment range is small, and the communication range cannot be adjusted by controlling the receiving sensitivity; 3. After long-term use, under the influence of gravity, wind, vibration and other factors, the installation angle will shift, resulting in large positioning errors

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