An intermediate frequency signal generating device for l-band equipment testing of avionics system

Abstract

The invention discloses an intermediate frequency signal generating device for L-band equipment testing of avionics systems, which utilizes a loading control unit based on a USB interface, a configuration stream storage unit based on a non-volatile memory, and a two-chip FPGA-based A digital modulation unit and a digital-to-analog conversion unit of the programming logic device generate intermediate frequency signals. At the same time, a two-stage decomposition is performed on the process of generating the composite modulated intermediate frequency signal required for testing, and it is processed by two FPGAs. In the actual test application, the loading control unit dynamically loads the function execution code of the primary modulation module and the secondary modulation module, that is, the FPGA execution code, which can quickly change the FPGA logic function under working conditions, and output different types of L that meet the test requirements. Band equipment IF test signal. The invention has the advantages of fast response speed, various waveforms of intermediate frequency signals, convenient and flexible control, low cost and small size. Combined with the L-band radio frequency signal module, it can conveniently build a test platform and an automatic test system together with other test and measurement instruments.

Description

technical field [0001] The invention belongs to the technical field of test signal generation, and more specifically relates to an intermediate frequency signal generation device used in the test process of L-band equipment of an airborne integrated modular avionics system. Background technique [0002] Airborne avionics system, also referred to as avionics system for short, is used in all stages of take-off, navigation and landing of various fixed-wing and rotary-wing aircraft. Its functions can be divided into several major categories such as communication, navigation, surveillance and identification. , involving specific functional items such as ground-air communication, weather detection, absolute and relative altitude measurement, air traffic control, and air collision avoidance. [0003] With the continuous development of technology and the continuous improvement of demand, the avionics system has gradually evolved from the original independent avionics system to the c...

AI Technical Summary

Problems solved by technology

The current special test instruments and automatic test systems can only generate a single type of test signal, which cannot meet the test needs well

Images