| As the unit-under-test and test equipments become more complex and advance , automatic test has been the key technique instead of manual test in the test and measurement world. Modem radars, which have been popularly employed in military, civil and commercial fields, are very important to national defense and economy development. To automatically test technique performance of radars not only ensures the manufacture quality of radars but also provides the essential quantitative and qualitative information for maintenance, fault detection and diagnosis. The automatic test is the major path to measure whether the radar normally functions or not and to localize the faults. From built-in-test (BIT) to automatic test system (ATS) the radar automatic test technology has been widely studied and successfully applied recent years.While BIT is application-specific and is limited in fault coverage rate, ATS has characteristics such as universal, open and standard, et al. Therefore the radar automatic test system has broader applicability and stronger test and diagnosis capability. Combining ATS with BIT can guarantee radars work normally and steady, on another hand improve test efficiency. This dissertation studies automatic test methodology for the technique performance of radars. Detailed discussions list as follows:1. Test methods concerned to technique performance of radars are proposed, which include transmitter, receiver, signal processing, antenna and feeder subsystems. The physical meaning and test diagram of each technique performance are also elaborated.2. After analyzing the test methods, the dissertation introduces how to build and realize the radar automatic test system based on VXI (VME Extended to Instrumentation) technique. It demonstrates how to choose the software development environment, how to select the hardware equipments, how to develop the test application package, and how to solve several key problems. At the end of this part,an example of testing the image frequency rejection is illustrated.The VXI radar automatic test system introduced in this dissertation has passed the state inspection and qualification, and has been delivered to customers. Qualification and utilization results demonstrate that the automatic test system is efficient and advance. |
