A Navigation Method for Low-altitude Cruise State of Anti-submarine Aircraft
A technology of cruising state and navigation method, applied in three-dimensional position/channel control, instrument, control/regulation system and other directions, can solve the problems of reduced buoy delivery accuracy, excessive aircraft overshoot, and delivery failure, etc. Navigation, improve guidance accuracy, avoid the effect of overshoot
Active Publication Date: 2019-05-24
BEIJING AEROSPACE ERA LASER NAVIGATION TECH CO LTD
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Problems solved by technology
The fire control system of a certain type of anti-submarine aircraft requires that the aircraft's entry distance at the buoy drop point is 5km, and the entry angle is 5°. If the high-altitude navigation algorithm is directly applied to low-altitude cruise, the aircraft will overshoot too much after turning. , after entering the buoy launch circle, the track angle requirements are not met, resulting in a decrease in the accuracy of the buoy launch or even a failure in launch
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[0032] The flow chart of the present invention is as figure 1 , figure 2 shown. The traditional manipulation signal S formula is:
[0033] S=K 1 E+K 2 ΔΨ e V
[0034] S=0.00361E+0.148ΔΨ e V (1)
[0035] In the formula, E is the yaw distance, V is the ground speed, ΔΨ e is the track angle error, K 1 ,K 2 is the control parameter. It can be seen from the formula that the control signal S is a function of track angle error, yaw distance and ground speed, and their influence on the control signal mainly depends on its coefficient K 1 ,K 2 , where the track angle error has the greatest influence on the control signal.
[0036] In the process of high-altitude navigation, the autopilot system controlled by the control signal is an open-loop control system, and the roll angle of the aircraft is not introduced into the calculation of the control signal as the controlled signal, which will lead to a slow response of the entire control cycle, and The accuracy is low, and t...
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The invention discloses a navigation method for a low-altitude cruising state of an antisubmarine aircraft. The method comprises the following steps that 1, the accelerated speed and the angular speed of the aircraft are measured, and the position, the speed and the posture of the aircraft are calculated; 2, after the aircraft is in the low-altitude cruising state, the cross track error of the aircraft is calculated in real time according to an acquired flying air route; 3, the east speed and the north speed of the ground speed are obtained through decomposition according to the aircraft ground speed obtained through calculation in the step 1, wherein the ground speed is the projection of an aircraft body on the ground relative to the speed of the earth; 4, a manipulating signal is calculated through the cross track error, the track angle error and the ground speed of the aircraft; 5, the manipulating signal is sent to an autopilot system, and an autopilot controls the roll angle of the aircraft according to the manipulating signal to enable the aircraft to turn. According to the method, the buoy putting precision of the aircraft is improved on the premise that the high flying quality of the antisubmarine aircraft is guaranteed, and then the putting success rate is greatly increased.
Description
technical field [0001] The invention relates to a navigation method for an aircraft in a low-altitude cruising state. Background technique [0002] In order to improve the accuracy and interception rate of submarine search, fixed-wing anti-submarine aircraft usually release sonobuoys at a height close to the sea surface. During this process, the EFIS system of the aircraft binds the route information into the inertial navigation system. The system calculates the lateral control signal of the aircraft in real time according to the calculated aircraft position and various flight parameters, and sends it to the autopilot system. The autopilot system then controls the flight attitude of the aircraft according to the signal to ensure that the aircraft can fly on the route. [0003] When launching buoys, the anti-submarine aircraft switches to the low-altitude cruising state. Compared with ordinary high-altitude flight routes, the buoy launching route has the characteristics of sh...
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IPC IPC(8): G05D1/10
CPCG05D1/101
Inventor 付宇辉陈善秋王雷刘鹏许鳌
Owner BEIJING AEROSPACE ERA LASER NAVIGATION TECH CO LTD