Design Of Smart Aircraft Integrated Microsystem

Smart aircraft plays an extremely important role in the military and civilian fields,such as UAV,flying weapons,etc.In the era of scarce spectrum resources,it is of great strategic significance to develop an integrated microsystem with strong antiinterference ability and fast transmission rate.In the past,in order to save on-board resources,functionally customized chips were often used to reduce the size and power consumption.However,this method has problems such as difficulty in system upgrade,long development cycle,and single system function.In order to support multifunctional smart aircraft applications with multi-mode data link,satellite navigation and other functions,this paper designs an integrated reconfigurable intelligent aircraft microsystem based on FPGA,SDR RF transceiver chip and multi-mode fusion RF front-end chip.The microsystem has functions including satellite navigation,multinode ad hoc network,and high-speed data transmission,and the hardware is highly integrated and reusable.In terms of hardware design,the entire system circuit board is designed based on flexible interconnection technology to reduce size so that improve the level of system integration.In the RF front-end,a dual-channel concurrent Si P package chip based on a bare chip is designed to work in the P-band and S-band,respectively.The chip is based on a microwave substrate and a ceramic package for surface-mount packaging.Its single-channel receive gain can reach 20 d B,the noise figure is less than 4d B,and the transmit output power can reach 30 d Bm.In terms of baseband processing,FPGA is used to complete high speed digital signal processing.the SDR RF transceiver chip with three transmit channels and two receive channels is used for the RF transceiver between the baseband and the RF front end.The chip’s parameters such as frequency,bandwidth,gain,and sampling rate can be reconfigured by software,while it supports frequency hopping and automatic gain control functions,and have strong anti-interference ability.With the multi-mode RF front-end and back-end baseband control,a reconfigurable RF micro-system architecture is designed and implemented.In terms of software,a signal processing protocol based on the DQPSK wireless communication system has been built in the microsystem to implement data transmission and ad hoc network data exchange.The specific processes include LDPC encoding and decoding,DQPSK modulation and demodulation,interleaving and deinterleaving,spread spectrum,shaping,matched filtering,and synchronous capture.On the basis of this communication protocol,the microsystem adds the functions of centerless ad hoc network and multi-mode navigation,makes the aircraft has the intelligent,informatized,and networked,and the ability of self-awareness and decisionmaking.Through experimental verification,the smart aircraft integrated microsystem designed in this paper realizes the functions of satellite navigation,data link transmission,and ad hoc networking,and has the ability of three-mode concurrency.It has the advantages of deep customization of system software,short system development cycle,miniaturization and light weight,and is of great significance to the intelligent research of aircraft.