Adaptive maximum intermediate frequency energy tracking radar receiving system

Abstract

The invention discloses an adaptive maximum intermediate frequency energy tracking radar receiving system, and the system comprises a radio frequency front end, a triggering board, an intermediate frequency amplifier board, and a radar terminal. The radio frequency front end comprises a low-noise amplifier, a double-balance frequency mixer, and a local oscillator. The triggering board comprises a microprocessor, a programmable gate array, a signal buffering processing module, an analog-digital conversion module, and a digital-analog conversion module. The intermediate frequency amplifier board comprises an energy voltage conversion circuit, a low-noise intermediate frequency amplification circuit, a band-pass filter circuit, a logarithmic amplification detection circuit, and a push output circuit. The radar terminal comprises a terminal processing display module. The invention provides a brand-new receiving system based on maximum intermediate frequency energy tracking, completely changes a mode of automatic frequency control of a conventional navigation radar receiving system, and effectively solves a problem that a conventional mode of frequency tracking causes the decrease of capability of finding a small object because of the frequency spectrum change of a radar transmitter magnetron. The digitalization of the radar receiving system improves the reliability and expansibility of the radar receiving system.

Description

technical field [0001] The patent of the present invention relates to the technical field of non-coherent marine navigation radar, specifically, an adaptive maximum intermediate frequency energy tracking radar receiving system. Background technique [0002] Marine navigation radar is mainly used for detection and tracking of maritime targets, assisting ship navigation and collision avoidance, and ensuring navigation safety. With the increasing complexity of the ship's navigation environment, the performance of navigation radar is directly related to the safety of the ship's navigation and the safety of the people on board. [0003] At present, marine navigation radar generally uses radar magnetron as the microwave power amplifier device of the radar transmitter. Since the transmission frequency of the magnetron will change with time and temperature, this makes the optimal center frequency point after down-conversion deviate from a fixed Frequency, if the radar receiving sys...

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Problems solved by technology

[0003] At present, marine navigation radar generally uses radar magnetron as the microwave power amplifier device of the radar transmitter. Since the transmission frequency of the magnetron will change with time and temperature, this makes the optimal center frequency point after down-conversion deviate from a fixed Frequency, if the radar receiving system cannot track the frequency change of the magnetron, it is better to stabilize the best tracking frequency at a fixed frequency. At this time, the radar intermediate frequency echo is not in the best tuning position, and the echo energy will weaken, affecting the radar The ability to detect small targets increases the safety hazards of ships sailing

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