Hardware Design Of TCAS Signal Simulation Equipment Based On PXI

With the development of the aviation industry and the increasing traffic of air traffic,the Air Traffic Alert and Collision Avoidance System(TCAS),as an airborne electronic system that reduces the risk of impact in crowded air traffic,plays an irreplaceable role in ensuring flight safety.In order to ensure the stable and reliable operation of the system,it is very important to check and test it.The TCAS signal simulation equipment designed in this paper tests the TCAS transceiver host,which is a key component of the TCAS system.It can simulate the generation of static and dynamic intrusion targets,and test the TCAS transceiver host’s ability to monitor and track intrusion targets.The principle to hardware implementation introduces the design process of the TCAS signal simulation device.The main research contents of this paper are as follows:1.Starting from the requirements of TCAS signal simulation equipment,by analyzing the monitoring and tracking principle of the inspected equipment,the technical route of zero-IF architecture in software radio technology is proposed,and the general demodulation model under this architecture is given.DPSK demodulation ideas.The conversion from baseband to RF signal requires only one mixing,which greatly simplifies the complexity of the hardware design,better controls the size of the device,and is easy to integrate.Then,the key information that the device needs to simulate is analyzed,and the implementation method is proposed.The target intrusion model is designed.2.According to the zero-IF architecture,the hardware circuit design is adopted,and the hardware implementation scheme of the programmable RF transceiver LMS7002 M plus FPGA is adopted.The RF transceiver configuration option is more flexible and the baseband processing function is more abundant.The PCI bridge chip is combined with the FPGA to design the PXI interface part,and the equipment related requirements are analyzed,and the circuit design of the storage,power supply and clock parts is completed.3.The relevant logic implementation is completed inside the FPGA.The two orthogonal data streams of the interrogation signal are subjected to pulse feature recognition,and the interrogation signal pattern is parsed.The DPSK demodulation using the dot product algorithm is completed to obtain an S mode interrogation signal symbol.The target parameter extraction and dynamic update logic are designed.The inverse cosine calculation is completed by using the optimized table lookup method to meet the requirements of space occupation and update speed.The response data processing realizes converting the azimuth information of the response data into the attenuation codes of the respective directions,and the height and other information are encoded according to different modes to generate the baseband IQ data stream,and output to the LMS7002 M for response after the delay time is reached.The feasibility of the design method of this thesis is verified by testing the platform.The completed TCAS signal simulation device has good performance indicators,and can realize the analysis of the 1030 MHz interrogation signal,the static and dynamic intrusion target update simulation,and generate the corresponding 1090 MHz response signal,which meets the design requirements.Finally,the design of the full text is summarized,and the shortcomings of the design are given.The future prospect of TXI signal simulation equipment based on PXI is put forward.