Sawtooth Frequency Modulation Radar System Design And Signal Processing Algorithm Realization

With the advancement of technology,the application of radar has gradually evolved from the military field to the civilian market,which has higher requirements for radar research and production costs.This paper adopts the form of multiple low-cost radar networks with TMS320F28335 DSP processor as the core,designs the sawtooth frequency modulation network radar system,and implements the whole signal processing algorithm flow on the hardware platform,while ensuring the system detection performance.Greatly reduced the development cost of the project.The radar system studied in this paper adopts sawtooth frequency modulated continuous wave signal.The design process is divided into three parts.The first part analyzes the overall structure and scheme design of the system in detail.By comparing the advantages and disadvantages of different waveform design methods,it is determined.The method of frequency band division is used to design different radar waveforms in the network.For the preprocessing technology of the networked radar system,the linear and parabolic interpolation algorithms are used to realize the time calibration,and the detailed implementation steps of the spatial calibration are given.The second part is the key content of this paper,which is the theoretical analysis and implementation of the whole signal processing algorithm flow of the radar system.Firstly,the method of measuring and measuring the speed of the detection target is realized by the method of two-dimensional FFT processing on the radar echo signal.The application of moving target display and detection technology solves the problem of signal leakage and clutter interference at the antenna transmitting end.Then,for the more accurate extraction of the distance and velocity information of the target,further constant false alarm detection and target condensation processing are performed on the echo signal.Finally,the angle measurement function is realized by the phase method.The third part is the software implementation of the radar system hardware platform and the various functional modules,including the waveform design between different radars in the network,the synchronous acquisition of four echo signals and the serial communication between the system and the host computer.The software implementation of the entire signal processing process is completed on the platform.Finally,the paper validates the correctness and reliability of the system function through multiple sets of field experiments,and lists the experimental results in tabular form.Themeasurement error of distance and angle is compared and analyzed in detail.The error can be controlled within 5% and the angular error is controlled within 8%.