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

Abstract

The invention discloses an automatic monitoring method for baseband zero value of an aircraft measurement and control system, aiming to provide an automatic monitoring method for baseband zero value with high monitoring accuracy, simple operation and reliable monitoring. The present invention is realized through the following technical solutions: the modulation output end of the FPGA is sequentially connected to a digital-to-analog converter DA, an amplifier, a filter and a 1-to-3 switch to form a radio frequency self-calibration channel connected to a 2-to-1 switch; through a 2-to-1 switch The filter of the FPGA receiving and processing interface and the analog-to-digital converter AD are connected in series in a clockwise direction to form a receiving channel; the FPGA sends the 1pps signal and the baseband output signal to the high-precision time difference measurement chip, and the time difference between channel 1 and channel 3 is measured. Measurement: compare the received zero value of the baseband this time with the standard baseband received zero value calibrated in advance to obtain the change in the baseband received zero value of the measurement and control transponder when it is turned on, and correct the received zero value of the aircraft measurement and control system according to the change .

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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