Co-channel interference processing system for pulse coherent answering machine

Abstract

The invention provides a co-channel interference processing system for a pulse coherent answering machine, which can solve the self-excitation problem of co-channel interference of a pulse coherent answering machine and ensure the working stability of the answering machine. The method is achieved by the following technical scheme that after the pulse answering machine antenna receives a radio frequency signal, the radio frequency signal FR enters a field amplifier module through a circulator, after the signal is filtered and amplified by the field amplifier module and then controlled by a microwave switch, the controlled radio frequency signal is mixed with a local oscillation signal to output an intermediate frequency signal, the intermediate frequency is amplified and detected by a middle amplifier module and then sent to a digital circuit module for A / D acquisition, a collected signal is stored and transmitted through a digital delay line, the timing control of the digital delay line is controlled by a sending and receiving timing control circuit, a forwarding signal is sent to a D / A converter for outputting an intermediate frequency signal which is subjected to up conversion by a transmitting channel module and then amplified by a power amplifier module, and an amplified signal FT is output by the circulator. The system solves the self-excitation problem of pulse transmit-receive same frequency.

Description

technical field [0001] The invention relates to a same-frequency interference processing system of a pulse coherent transponder in a single pulse transponder of a pulse system measurement system. Background technique [0002] Monopulse radar is a precision tracking radar. Measurement accuracy is generally expressed by the size of the data error output by the radar. Every time it transmits a pulse, the antenna can form several beams at the same time, and compare the amplitude and phase of the echo signals of each beam. When the target is on the axis of the antenna, the amplitude and phase of the echo signals of each beam are equal, and the signal difference is zero. ; When the target is not on the antenna axis, the amplitude and phase of the echo signals of each beam are not equal, resulting in a signal difference, and the antenna is driven to turn to the target until the antenna axis is aligned with the target, so that the elevation angle and azimuth angle of the target can...

AI Technical Summary

Problems solved by technology

From the perspective of radar measurement accuracy, there are some defects in the above processing mechanism: 1) Modern radars often use chirp signals. Sampling at other locations results in a slight loss of signal

However, the pulse transponder of the traditional analog system uses an analog circuit scheme based on microwave switches, which is limited by the isolation index of analog circuits such as circulators and microwave switches. When the power of the transmitted signal is large, it will still interfere with the receiving channel, resulting in Impulse transponder retransmits spontaneous pulses, working abnormally

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