Hardware Design Of ADS-B System Test Equipment Based On Zero-IF Technology

With the development of China's aviation industry,the increasing number of air vehicles has made air traffic more and more crowded.There is an urgent need to develop new aviation technologies.Traditional regulatory techniques have become increasingly inefficient.With the application and development of ADS-B(Automatic dependent surveillance-broadcast),this problem can be effectively solved.In the future complex airspace,it can support higher density flying airspace.The ADS-B system can realize surveillance and communication between aircraft targets and ground stations.The construction cost of ADS-B is lower,but the efficiency is higher.In the future,there is a broader prospect for development.In the future,The ADS-B system has broad significance applications,and my country's airspace is more suitable for the 1090 ES data link.Its Cost-effective,and the adaptation system is simple.This subject mainly studies the design of ADS-B signal test equipment in UAT mode and 1090 ES mode.Reliable and stable ADS-B system equipment needs to pass the test of higher precision test equipment.With the application of the ADS-B system,there is also a large demand for the test equipment of the ADS-B system.In this design,standard instrument test equipment specifications are used to design a standard 3U test card.Simulate the ADS-B signal in UAT mode and 1090 ES mode to complete the function of ADS-B In and ADS-B Out test.This thesis designs test equipment according to the requirements of ADS-B equipment.According to DO-282 and DO260 B test file requirements,divide the hardware test steps.Finally,based on the comparison of zero-IF,IF,and low-IF solutions.Choose the test method of zero-IF.In the receiving and sending process of this technology,only one mixing is needed to convert the RF signal to baseband or modulate the baseband to RF signal.The structure is simple and the volume is more portable.The signal simulation equipment of this design includes hardware circuit design and hardware logic control.The hardware circuit uses the AD9361 RF transceiver as the RF core device.The control logic design completes the configuration of the AD9361 register by the computer,realizes the reception of the ADS-B signal and the transmission of the analog signal in the UAT mode and the 1090 ES mode,and the Verilog HDL programming of the FPGA digital signal processing part.The subject specifically completed the ASK modulation and demodulation,CPFSK modulation and demodulation,1090 ES data link header detection,UAT data link synchronization signal detection,and digital filter design.After the design is completed,build a complete test platform to complete the test of the design indicators.Verify the correctness of the design plan.