Automatic baseband zero value monitoring method for aircraft measurement and control system

Abstract

The invention discloses an automatic baseband zero value monitoring method for an aircraft measurement and control system, and aims to provide a baseband zero value automatic monitoring method which is high in monitoring precision, simple and convenient to operate and reliable in monitoring. According to the technical scheme, a modulation output end of an FPGA is sequentially connected with a digital-to-analog converter DA, an amplifier, a filter and a radio frequency self-calibration channel, formed by connecting one-to-three switches, of a one-out-of-two switch; the one-out-of-two switch issequentially connected with the a filter of the FPGA receiving processing interface and an analog-to-digital converter AD in the clockwise direction to form a reception channel; the FPGA sends a 1ppssignal and a baseband output signal to a high-precision time difference measurement chip, and a time difference between a channel 1 and a channel 3 is measured; and a baseband receiving zero value iscompared with a pre-calibrated standard baseband receiving zero value to obtain the variable quantity of the baseband receiving zero value of a measurement and control responder, and zero value of theaircraft measurement and control system is corrected according to the variable quantity.

Description

technical field [0001] The invention relates to a method for automatically monitoring the change of baseband transceiver zero value in an aircraft measurement and control system. The "aircraft measurement and control system" referred to here includes satellite measurement and control systems, unmanned aerial vehicle measurement and control systems, aviation / aerospace vehicle measurement and control systems, and interstellar measurement and control systems. Background technique [0002] The aircraft measurement and control system includes subsystems such as external measurement, telemetry, communication, and safety. It is the only channel for the aircraft to communicate with the ground. One of the systems critical to the success and safety of aircraft testing. The aircraft measurement and control system mainly includes a normal transmission channel, a zero calibration channel and a normal reception channel. Taking one receiving and one sending as an example, the normal tran...

AI Technical Summary

Problems solved by technology

At this time, the zero value change of the digital baseband part caused by switching on and off can no longer be ignored

However, the existing zero-value calibration method does not monitor the zero-value change of the digital baseband, especially for the aircraft carrier equipment, it can no longer be calibrated by precision instruments after switching on and off, and the existing online channel monitoring can only Can monitor the zero value change of the RF channel part

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