Aircraft height control method and system based on radar technology

Abstract

The invention discloses an aircraft height control method and system based on a radar technology, and the system includes an omnidirectional rotating base and a shielding protective cover, a radar ranging unit and a feedback adjusting unit are arranged in the shielding protective cover, and the radar ranging unit comprises an antenna front end, the antenna front end comprises a transmitting antenna connected with the transmitting channel and a receiving antenna connected with the receiving channel, the input end of the transmitting antenna is connected with a power amplifier used for amplifying and driving, and the output end of the receiving antenna is connected with a low-noise amplifier; the input channel end of the antenna front end is connected with a transmitting and modulating unit,the output channel end of the antenna front end is connected with a phase measurement unit based on a high-precision time measurement technology; the output end of the phase measuring unit is furtherconnected with a wireless signal emitter used for being communicated with the feedback adjusting unit. According to the invention, the measuring precision and the ranging range of the radar ranging system are effectively improved, the closed-loop feedback adjustment on the height of the aircraft is realized, and the control precision is high and the performance is good.

Description

technical field [0001] The invention relates to the field of radar systems, in particular to a radar technology-based aircraft altitude control method and system. Background technique [0002] In the control system of aircraft (such as UAV), altitude control is realized based on the altitude measured in real time, so the stability of altitude control mainly depends on the measurement accuracy and real-time performance of the altimeter. At present, the altitude is usually measured directly by the altimeter in the aircraft. There are many types of altimeters, such as GPS, barometer, ultrasonic sensor, etc. Among them, GPS is only suitable for altitude measurement when there are no trees or buildings to block and the signal is stable. , the relative altitude accuracy is low, and the update frequency of GPS data is 1Hz, and the real-time performance is poor; the barometer is easily affected by the airflow, and the height measurement drifts greatly; Accurate height determination...

AI Technical Summary

Problems solved by technology

[0004] At present, multi-frequency radar is widely used in height measurement. However, these multi-frequency radar methods still have shortcomings: the dual-frequency phase comparison method has the contradiction of expanding the ranging range and improving accuracy; the staggered multi-frequency method needs to transmit multiple sets of dual-frequency The algorithm has a large amount of calculation and the system is complex; the multi-frequency to dual-frequency method has strict requirements on the ranging accuracy; the quadratic phase method also needs more transmitting frequency points, etc.

However, multi-frequency measuring ruler switching will reduce the real-time performance of the measurement, and introduce measurement errors caused by mechanical and electrical jitter caused by measuring ruler switching, and the switching speed (several seconds) is slower than the target state change (such as vibrating bridges, tall buildings, etc.)

[0005] For example, the application publication number is 106681344A, a kind of altitude control method and control system for aircraft, the method steps include: 1) respectively arrange radar, accelerometer, barometer and GPS module in the aircraft; 2) during the flight of the aircraft, If it is within the effective detection range of the radar, first obtain the information detected by the radar, accelerometer, barometer, and GPS module for fusion, and then fuse the result with the information detected by the radar; otherwise, perform detection based on the accelerometer, barometer, and GPS module. Data fusion processing; obtain current altitude value, current vertical velocity value and current vertical acceleration value; 3) carry out height control to aircraft according to obtained current altitude value, vertical velocity value and vertical acceleration value, although this method can realize the measurement of altitude And control, but the distance measurement accuracy of this method is limited, and the height measurement distance is limited by the frequency of the radar transmission signal

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