基于FPGA与DSP遥测声压谱分析装置设计

Design of Acoustic Pressure Spectrum Analysis Device Based on FPGA and DSP Telemetry

为压缩飞行器遥测系统运行过程中的数据传输量,设计了遥测声压谱分析装置。设计基于FPGA与DSP双核架构,配合流水线作业的设计理念,采集信号的同时进行数据时频转换,并实时将数据处理结果传输给外部设备。噪声信号声压谱密度(SPL)算法运用1/3倍频程的方式选择噪声的频率带,采用快速傅里叶变换法(FFT),极大地降低运算量,缩短数据转换时间,从而实现数据传输的实时性。测试结果表明,该数据预处理装置算法的误差小于3.4%,设计具有良好的实时性和稳定性,具有较高的实用价值。

In order to reduce the data transmission volume during the operation of the aircraft telemetry system,a telemetry sound pres-sure spectrum analysis device is designed.The design is based on FPGA and DSP dual-core architecture,combined with the design con-cept of pipeline operation,data time-frequency conversion is performed at the same time as the signal is collected,and the data process-ing results are transmitted to external equipment in real time.The noise signal sound pressure spectral density(SPL)algorithm uses 1/3 octave to select the frequency band of noise,and adopts fast Fourier transform(FFT)to greatly reduce the amount of calculation and shorten the data conversion time,thereby realizing data Real-time transmission.The test results show that the algorithm error of the data preprocessing device is less than 3.4%,and the design has good real-time performance,stability,and practical value.