Airborne anti-collision radar system of helicopter

Abstract

The invention provides an airborne anti-collision radar system of a helicopter. The airborne anti-collision radar system comprises a signal generation unit, a transceiving unit, a servo drive unit, a signal preprocessing unit, a signal post processing unit, a data analysis unit, and a display unit. The signal generation unit is used for generating a linear frequency-modulated continuous-wave signal. The transceiving unit is used for carrying out harmonic mixing on the continuous-wave signal to obtain a detection signal. The servo drive unit is used for determining a scanning range of an antenna unit based on navigation data of a helicopter and driving the antenna unit to radiate the detection signal based on the scanning range. The transceiving unit is also used for obtaining an echo signal received by the antenna unit. The signal preprocessing unit is used filtering and amplifying the echo signal to obtain a difference frequency signal. The signal post processing unit is used for carrying out analog-to-digital conversion on the difference frequency signal, carrying out fast Fourier transform and constant false alarm processing after the analog-to-digital conversion, and then outputting target information. The data analysis unit is sued for generating target information on a radar image according to the scanning range of the antenna unit. And the display unit is used for displaying the radar image. Therefore, long-distance power line detection is realized.

Description

technical field [0001] The invention relates to the technical field of airborne radar, in particular to a helicopter airborne collision avoidance radar system. Background technique [0002] There are many reasons for helicopter accidents, one of which accounts for a considerable proportion is the collision with low-altitude obstacles during flight. Through analysis, this is because helicopters often perform flight missions between tens to hundreds of meters in height, and in this height range, it is often easy to encounter mountains, woods, high-rise buildings, and man-made objects such as power lines, utility poles, and buildings. object. Among them, power lines are the most harmful to the flight safety of helicopters, because large targets such as buildings and trees are relatively easy to find, while power lines are small and difficult to be found by naked eyes in complex backgrounds. According to the US military, the number of helicopters lost due to collisions with pow...

AI Technical Summary

Problems solved by technology

Infrared thermal imaging cameras are not widely used because they are easily affected by weather conditions; electromagnetic field detector technology is mature and low in cost, but it can only detect power lines that are transmitting power, which limits its application range; ground proximity warning The system can assist the pilot to a certain extent to prevent collisions with low-altitude obstacles below, but it does not have the "forward-looking" function, that is, it cannot detect obstacles in the forward view of the helicopter; the laser radar has high precision and strong detection ability for thin wires. The screen is intuitive at present, so it is widely used, but the price of lidar is high, the technical risk is high, and the detection ability is poor in bad weather conditions; millimeter wave radar has great advantages in terms of scanning rate, weight, volume and power consumption. , and it can work in harsh weather conditions, which makes the millimeter-wave radar more suitable for helicopter loading, so the millimeter-wave radar is very popular and widely used

[0004] However, the millimeter-wave radar currently used is mainly used to detect large targets such as buildings and trees. For small targets such as power lines, the detection accuracy is very low and cannot meet the flight requirements.

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