| In security fields such as counter-terrorism, rescue, acquiring information of people and scene in a room and positions of possible survivors behind barriers is highly demanded. For this reason, many countries, e.g. the United States, Britain, have developed several through-the-wall radars and put them to actual use since end of the last century. As the performances of these systems becoming better and better, some trends in system itself are also emerging, e.g. multifunction, miniaturization and fine operability.Taking off from good portability and operability, this dissertation designs and implements the embedded display and control subsystem for a stepped-frequency Ultra-Wideband through-the-wall radar, achieving a success in getting radar's detection and tracking ability of slow moving targets. The main efforts and outcomes of this dissertation cover the following several aspects:(1) Overall design this embedded radar subsystem, and finally outcome a comprehensive solution including the following parts:architecture composing of a central controller in the form of a programming logic and a console based on arm and Linux; a data transmission solution using two dual-port srams, an Ethernet controller and UART; a system location method making use of a rotary encoder.(2) After a cautious selection of the prime chips and console platform, central controller's hardware platform with the additional capability of signal sampling is implemented.(3) Design and verify the central controller's HDL logic utilizing the up-down design methodology, it comprises the following sub-modules:module receiving configuration data from console, module controlling radar's transmitter, module for location data acquisition, module of receiving and pre-processing of ADC data, module constructing data frame and stream, and module fulfilling the task of data transmission and receiving with the signal processor.(4) Develop the application residing in the Linux-based console by means of software engineering. The application is able to configure and monitor the radar system, graphically display targets'tracks and communicate with radar's other modules. In this application, multi-thread programming is utilized to refresh the track(s) real time; in addition, the application provides a management on configuration information through a manipulation on the configuration file.(5) At last, this dissertation presents the test process and results for this embedded radar subsystem, and test results demonstrate that it is able to work as expected, so finally, an experiment achieving a full success is done, with the purpose of detecting and tracking slow motion through-the-wall. |
