With the rapid development of electronic technology and computer technology, several commercial ground penetrating radar systems have begun to be initially applied, including the Pulse EKKO series of Canadian probe and software company (SSI) and the Swedish geological company (SGAB). The RAMAC drilling geological radar system, the SIR system of the American Geophysical Exploration Equipment Company (GSSI), and the Georadar series of the Japanese Applied Geology Co., Ltd. (OYO). However, these foreign products are expensive to manufacture, and the limitations of measurement are large, which seriously affects its popularity. In view of the wide range of uses of ground penetrating radar, it has been developed and developed. Due to space limitations, the paper focuses on the data acquisition part and display software.
1 Data collectionIn the ground penetrating radar data acquisition test, the HY-6070 C universal data acquisition control board is used. The function of this board is mainly A/D and D/A data conversion. The interface is ISA bus type, can be directly inserted into the computer with ISA bus expansion slot, under the control of the computer constitutes signal acquisition, monitoring input system and analog voltage signal, digital voltage signal input system. The HY-6070 C board has a 12-bit resolution A/D converter with a pass rate of 40 kHz. Two analog signal input methods are provided for the user: 16 single-ended inputs and 8 dual-ended inputs. Through the Hardware setting, the analog voltage signal input range can be 0~5 V, soil 2.5 V, ±5 V. The board also provides a 12-bit 12-bit D/A conversion analog voltage output channel. A programmable timer/counter 82C54 is also provided on the HY-6070 C board, in which the Timer/Counter 1 and Timer/Counter 2 of the 82C54 are cascaded to generate a signal for timing start A/D conversion. The timer/counter O is taken separately for the user to use. HY-6070 C board supports three kinds of A/D circuit startup conversion modes: software trigger, timing trigger and external trigger. Support software query and interrupt application data transfer mode of operation. The HY-6070 c board also provides users with 16 digital input/output channel signals, and the interface level conforms to the TTL level standard.
In this paper, software programming is used to start the A/D conversion function of the HY-6070 C board. In the software trigger mode, the channel is switched by the software before starting the A/D conversion, and then the A/D conversion start command is sent to trigger the A/D conversion. When the A/D conversion is completed, the A/D completion bit can be queried by software. When the program detects that the A/D completion bit is "1", the 12-bit data of the A/D conversion can be read.
The steps of the A/D sampling procedure are as follows:
(1) Set the analog signal input channel on the board (a total of 16 channels, numbered 0 to 15);
(2) Set the A/D trigger mode, which is set to software trigger here;
(3) Start triggering A/D conversion;
(4) Waiting and querying the A/D conversion completion flag;
(5) Store the received data.
Various addresses are pre-assigned in the HY-6070c data acquisition card, and the program controls the implementation of A/D sampling by accessing these addresses and performing corresponding read and write operations. In practical applications, you can directly use the application compiled by C language to control the acquisition card for A/D conversion, just call the header file as dos. Outport (address, data) in h (address is the address value, data is the data to be output to the address) and inportb (ADaddress) (ADadress is the address stored in the A/D conversion data) two functions, but The application environment must be a DOS operating system. This brings a lot of inconvenience to the user of the application. Therefore, in order to make it easy for users to use, the author has created a display software based on the Windows operating system. Since the Windows operating system cannot directly read the in-board address of the capture card like DOS, in order to program the data acquisition card, the driver of the data acquisition card needs to be installed first, so that the Windows operating system can recognize the hardware. In the next programming, you must also use the two files that come with the data acquisition card, HKIoMFC. H and HKIoMFC. Lib, in these two files, defines the variables and function bodies that control the capture card, which can be called directly during programming.
2 display softwareUsing Visual C++ 6.0 to develop applications under the Windows operating system mainly uses the MFC (Microsoft FbundaTIon Class) class library. MFC is an object-oriented Windows programming interface provided by Microsoft for Windows programmers, which simplifies Windows programming. Advantages of using the MFC class library: First, MFC provides a standardized structure so that developers do not have to design and manage the programs required for a standard Windows application from scratch, but program from a relatively high starting point, saving a lot of Time; second, it provides a lot of code to guide the user to implement certain techniques and functions when programming. The MFC library leverages the years of experience of Microsoft developers developing Windows programs and can incorporate these experiences into their own applications.
The Visual C++ 6.0 integration environment provides a variety of user-friendly accessibility tools for MFC. AppWizard can be used to generate new classes that can be used to maintain class members. MFC provides a mechanism to directly link Windows messages to a member of a class, reducing the processing between programmers. For example, add a command item to the menu, specify its command ID, and then use ClassWizard to specify that this menu ID is associated with the member function of the class. The required programming is to implement the code of the member function. The other code is MFC and Class. -Wizard is responsible for processing. This mechanism improves the efficiency of program development, and Visual C++ provides all the source code of MFC. This source code is not only for reference, but also provides convenience for debugging of the application. The openness of the source code is also a major success of MFC. the reason.
The display software designed by the author is an application based on a single document (SDI) framework structure, and its appearance is shown in Figure 1.
As can be seen from the figure, the appearance of a single document is similar to that of a common Windows application, so it is easy to operate, and only needs to select each menu to perform the corresponding function.
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