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Intelligent transportation light signal receiving system based on spread-spectrum technology, and control method thereof

A technology for intelligent transportation and receiving systems, applied in transmission systems, short-distance systems, electromagnetic wave transmission systems, etc., can solve problems such as occlusion, achieve the effect of increasing channel capacity, increasing transmission bandwidth, and improving signal-to-noise ratio

Inactive Publication Date: 2015-09-16
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an intelligent traffic optical signal receiving system based on spread spectrum technology and its control method, so as to overcome the defects in the prior art mentioned above. The free switching of reception solves the problem of occlusion

Method used

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  • Intelligent transportation light signal receiving system based on spread-spectrum technology, and control method thereof
  • Intelligent transportation light signal receiving system based on spread-spectrum technology, and control method thereof
  • Intelligent transportation light signal receiving system based on spread-spectrum technology, and control method thereof

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Effect test

example 1

[0053] Such as Figure 5 There are four traffic lights ①②③④ at the intersection, and motor vehicles ⑤ are equipped with receiving and communication systems ⑥.

[0054] The four traffic lights generate two-by-two orthogonal spreading codes, and the correlation peak values ​​of the car and the traffic lights are calculated as Figure 6 For a, b, c, d, we choose the signal a with the highest peak, so communicate with the signal light ① corresponding to a, when the position of the car changes, such as Figure 7 , at this time, the correlation peak such as Figure 8 For a, b, c, d, the highest one becomes signal light ②, then the received signal is switched from signal light ① to signal light ②, which solves the switching problem of receiving signals from multiple transmitting sources.

example 2

[0056] There are four traffic lights ①②③④ at the intersection, and motor vehicles ⑤ are equipped with receiving and communication systems ⑥.

[0057] The four traffic lights generate two-by-two orthogonal spreading codes, and the correlation peak values ​​of the car and the traffic lights are calculated as Figure 6 For a, b, c, d, we choose the signal light ① with the highest peak value for communication, when there is an obstacle ⑦ in front of the car ⑤, such as Figure 9 , at this time, the signal of the signal light ① with the highest correlation peak cannot be received, and the correlation peak values ​​of the car and the traffic signal light are calculated as Figure 10 a, b, c, d, at this time we receive the signal of the signal light ④, which solves the problem of occlusion.

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Abstract

The invention discloses an intelligent transportation light signal receiving system based on a spread-spectrum technology, and a control method thereof. According to the intelligent transportation light signal receiving system, pairwise orthogonal spread spectrum codes are generated by utilizing data to be transmitted via a shifting register, the spread spectrum codes are subjected to MPPM modulation, and an LED light source is used for reflecting light according to MPPM signal output through a driving circuit after modulation; at a receiving end, electric signals obtained through detection by a photoelectric detector are amplified and subjected to MPPM modulation, a signal transmitted by which transmitter is determined to be received through correlation peak calculation, and the signal is sent out after despreading finally. The intelligent transportation light signal receiving system realizes free switching of signal receiving through the combination of the spread-spectrum technology and a PPM modulation technology, and solves the problem of sheltering.

Description

technical field [0001] The invention is applied in an intelligent traffic system in the field of optical communication transmission, relates to LED visible light communication in a complex traffic environment, and specifically relates to an intelligent traffic optical signal receiving system based on spread spectrum technology and a control method thereof. Background technique [0002] The Intelligent Transportation System (ITS for short) is the development direction of the future transportation system. It effectively integrates advanced information technology, data communication transmission technology, electronic sensor technology, control technology and computer technology, etc. It is a real-time, accurate and efficient integrated traffic management system established by the traffic management system that plays a role in a wide range and in an all-round way. The application of intelligent traffic lights in the intelligent transportation system makes the utilization of roa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B10/524H04B1/707
Inventor 秦岭巨永锋徐艳红胡晓莉杜永兴郭瑛杜凯
Owner CHANGAN UNIV
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