Application And Research Of Algorithm Based On Chip-Z Transform In Radar Level Instrument

At present, grain and oil, coal, chemical industry, construction and other industrydevelop more rapidly. Material breed is also various. Material warehouse, differentfrom traditional cabin, has changed into storage tanks of high altitude development,most of its capacity is between one to ten thousand tons and more, and there aredozens or even hundreds of meters in height. In the process of production it is anurgent need to understand exactly the amount of materials in the warehouse.Therefore, error of a few centimeters will bring great losses to enterprises. And it maybe potential trouble of serious accident. So measuring accuracy of the height ofstorage tanks will directly affect the economic interests of the merchants. And thusranging accuracy of radar tools should be quite high.FMCW radar level measuring instrument is indispensable measuring instrumentin the modern industrial production. Its application environment is relatively poor,while it has low emission power, high precision distance measurement, and relativelystrong ability of anti-interference. In industrial production, FMCW radar levelmeasuring instrument has been widely used.This article is mainly focus on the problem of improving accuracy of theDSP-based FMCW radar. First, apply synchronization signal retrace to radardifference frequency signal to fundamentally remove the strong interference broughtby frequency of the radar signal retrace, the innovation point in this paper. Thensimply process signal with filter and FFT algorithm in DSP. Due to the barrier effectof FFT, ranging error was enlarged. Therefore, method of combining FFT algorithmand Chirp-Z transform for radar difference frequency signal processing is used.Thereby refining the spectral line in frequency region on frequency spectrum andreduce errors caused by barrier effect of FFT algorithm. Finally, the algorithm isrealized in MATLAB simulation. Through signal data processing of radar level meterdifference frequency, simulation results show that this approach does improve theranging accuracy of radar level instrument. Eventually be implemented in the DSP.