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Intelligent traffic optical signal receiving system and its control method based on spread spectrum technology

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 effects of increasing channel capacity, reducing bit error rates, and increasing transmission bandwidth

Inactive Publication Date: 2017-06-23
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 traffic optical signal receiving system and its control method based on spread spectrum technology
  • Intelligent traffic optical signal receiving system and its control method based on spread spectrum technology
  • Intelligent traffic optical signal receiving system and its control method based on spread spectrum technology

Examples

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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 traffic optical signal receiving system based on spread spectrum technology and a control method thereof. The data to be transmitted is generated by using a shift register to generate two-two orthogonal spread spectrum codes, and then MPPM modulation is performed on the spread spectrum codes. After modulation, the LED light source is used to transmit light according to the signal output of MPPM through the driving circuit; at the receiving end, the electrical signal detected by the photodetector is amplified and MPPM demodulated, and the corresponding peak value is calculated to determine which transmitter to receive The transmitted signal is finally despread and sent out. The invention realizes the free switching of signal reception and solves the problem of occlusion through the combination of spread spectrum technology and PPM modulation technology.

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 Patents(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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