Study On Key Technologies Of Position Information Broadcasting Equipment For Surface Moving Targets

With the rapid development of the civil aviation industry,the number of aircraft has increased significantly,as well as special vehicles and staff member.At the same time,the problem of surface surveillance has become more prominent.The phenomena of special vehicles invading the runway and collisions between aircrafts and vehicles occur from time to time,which poses a serious threat to the efficiency and safety level of the airport.Based on this,the key technologies of position information broadcasting equipment for surface moving targets are studied in this article,and low-cost,portable equipment for surface special vehicles and various service personnel are designed.Using this equipment,the surface moving targets can broadcast their position,identity and other information,which can supplement existing surface surveillance methods and reduce the burden of airport.The main work of this article is as follows:1.Applying the 1090 ES data link technology to the position information broadcasting equipment for surface moving targets,and customizing its message protocol,so that it has identity,longitude,latitude,speed,heading and other information included in one message,which greatly saves the bit resources and improves the bit utilization rate of the message.2.Research on the key hardware technologies of position information broadcasting equipment for surface moving targets.This article proposes the overall architecture of the equipment,and analyzes the GNSS receiving module,control core,carrier generation module,signal modulation module,power module and other modules in detail.Based on the functional requirements,the respective hardware implementation schemes were studied and specific hardware implementations were carried out.3.Research on the key software technologies of position information broadcasting equipment for surface moving targets.This article focuses on GNRMC frame reception and data extraction,the coordinate conversion algorithm,cyclic redundancy check coding,and the ARM implementation of pulse position modulation.And DMA data transfer that can reduce the CPU load is also studied.4.A joint software and hardware experiment is performed for the position information broadcasting equipment.The results of GNRMC frame reception and data extraction,baseband signal generation,1090 MHz RF carrier generation,2ASK modulation,power amplification are displayed and analyzed,and the feasibility of the design scheme is demonstrated.