Liu Tian

Bio: Liu Tian is an academic researcher. The author has contributed to research in topics: Signal processing & Signal. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

Software-based radar signal real-time processing system

Abstract: The invention discloses a software-based radar signal real-time processing system. The software-based radar signal real-time processing system comprises an acquisition playback integrated board card and a host computer signal processing module. The acquisition playback integrated board card comprises a transmitting waveform generating module, an echo signal acquisition module, a transceiving time sequence control module, and an optical fiber link transmission module. The host computer signal processing module is used for real-time reading of data transmitted to an internal memory of a host computer, and is used for the real-time processing of the radar echo signal. A radar signal processing program is developed on the host computer by the software, and the direct operation on the hardware is prevented, and programming is easy to realize, and the efficiency of the radar signal processing development is greatly improved. The data acquired by the radar is transmitted to the host computer for processing in a real-time manner, and by adopting software integrated environment for developing, and the dependence on hardware resources is prevented, and therefore high portability is provided. Later function extension is facilitated, and interconnection and networking a plurality of radar products are realized, and therefore a higher joint operation capability is formed, and good system extensibility is provided.

Software radar signal data processing system and software radar signal data processing method

Abstract: The invention relates to a software radar signal data processing system and a software radar signal data processing method, so as to solve the problem of poor extensibility caused by software radar frame structure limitations in the prior art. The system comprises a hardware layer, a system layer, a middle layer and an application layer, wherein the middle layer is used for realizing universality between different hardware platforms; the middle layer is located between the application layer and the system layer for providing general service for an upper layer and is provided with a general protocol stack and a standard program interface, and the middle layer comprises data receiving middleware, data transmission middleware, real-time storage middleware, signal processing middleware, data processing middleware and radar terminal display middleware; the application layer builds a signal data processing frame based on the middle layer, a radar signal data processing function is divided to multiple assemblies and modules, and functions of platform function management and radar real-time data processing are included. Through modifying the software module of the application layer in the system, the system can be reconstructed, requirements of other radar systems can be met, a complete radar signal processing process is built, the extensibility of the system is enhanced, and the use range of the system is expanded. The system and the method of the invention are applicable to the software radar field.

Multichannel radar intermediate frequency data acquisition and playback system

Abstract: The invention discloses a multichannel radar intermediate frequency data acquisition and playback system, which comprises an ADC acquisition sub-card (1), a DAC playback sub-card (2), a data preprocessing module (3), a data post-processing module (4), a storage array management circuit (5), a memory (6), an upper computer module (7) and a dump card (8), wherein the data preprocessing module (3) isused for system time sequence control, chip configuration, parameter analysis, data preprocessing and the like; the data post-processing module (4) is used for completing complex processing such as MTI, MTD and CFAR of radar echo data; and the upper computer module (7) is used for setting parameters of the signal acquisition and processing system and realizing acquisition, storage and control ofreal-time high-speed data. The multichannel radar intermediate frequency data acquisition and playback system supports multi-channel, high-precision and high-speed radar intermediate frequency data acquisition and playback, has long-time and high-capacity data storage capacity, supports real-time radar signal processing and data dump during data acquisition, and is powerful in function and suitable for engineering application.

Method and device for generating pulse compression coefficient of target detection radar system

Abstract: The invention provides a method and device for generating the pulse compression coefficient of a target detection radar system. The method comprises the following steps of calculating configuration parameters by an FPGA main control module, and inputting the configuration parameters into a direct frequency synthesizer; generating linear frequency modulation signals required by the radar system through the direct frequency synthesizer, and sending the linear frequency modulation signals to a radio frequency front-end module; performing up-conversion on the linear frequency modulation signals byan emitting channel of the radio frequency front-end module to be in a radio frequency band; looping back radio frequency cables to a receiving channel of the radio frequency front-end module; performing down-conversion on the signals at the radio frequency band by the receiving channel to be at the medium frequency, and sending the signals to an analog-digital converter; transmitting data of loopback signals to the FPGA main control module by the analog-digital converter; receiving loopback DDS data exported by the FPGA main control module by a data analysis module; and calculating the optimal pulse compression coefficient by a pulse compression coefficient optimization method. According to the scheme, the pulse compression performance of the radar system can be improved; and higher radar range resolution is obtained.