Improved predictive guidance method for RLV reentry heat flux tracking

A technology of predictive guidance and predictive correction guidance, which is applied in the field of flight guidance and can solve problems such as complex tasks

Active Publication Date: 2020-03-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] However, future reentry vehicles will have more complex missions and more stringent load requirements. In order to meet the needs of ...

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  • Improved predictive guidance method for RLV reentry heat flux tracking
  • Improved predictive guidance method for RLV reentry heat flux tracking
  • Improved predictive guidance method for RLV reentry heat flux tracking

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Embodiment Construction

[0066] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with specific embodiments.

[0067] An embodiment of the present invention provides an improved predictive guidance method for RLV reentry heat flow rate tracking, such as figure 1 As shown, the reusable carrier with a medium lift-to-drag ratio in this embodiment is Horus-2B. The maximum heat flow rate of this aircraft is usually 450 kilowatts per square meter, and the maximum overload is about 4g. The initial state of its reentry section And the end state is shown in Table 1.

[0068]

[0069] Table 1

[0070] In the table, the unit of aircraft altitude is km, the unit of speed is m / s, and the unit of other angles is degree. These six state quantities represent the flight altitude, the latitude and longitude of the sub-satellite point, the speed of the aircraft, the inclina...

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Abstract

The invention discloses an improved predictive guidance method for RLV (reusable launch vehicle) reentry heat flux tracking, and relates to the technical field of flight guidance. According to the method, a longitudinal guidance law and a transverse guidance law in prediction correction guidance are improved, and the method mainly comprises the following steps that when the longitudinal guidance law is designed, firstly, the maximum value of the heat flow rate at the current moment is determined, and then a heat flow rate tracking compensation item is introduced into longitudinal guidance lawdesign to correct the heeling angle amplitude; in the transverse guidance law design process, geographical constraints can be effectively processed by utilizing transverse guidance logic designed by an improved artificial potential field method, and the transverse guidance logic after the reusable vehicle flies over a no-fly zone is determined by a track azimuth angle error corridor. According tothe method, the landing point precision of the aircraft can be guaranteed, and process constraints and geographical constraints in the flight process can be met.

Description

technical field [0001] The invention relates to the technical field of flight guidance, in particular to an improved predictive guidance method for RLV reentry heat flow rate tracking. Background technique [0002] A reusable launch vehicle (RLV, reusable launch vehicle) can not only be used as a civilian vehicle that travels freely between the world and the earth, but also has the ability to quickly strike globally. After the end of the space shuttle era, the success of "Falcon 9" and X-37 greatly encouraged people's research and development boom for reusable vehicles. Therefore, major countries in the world have carried out in-depth research on the structure, materials, guidance, control and other systems of reusable vehicles. [0003] However, due to the complex flight environment, diverse missions, and harsh constraints in the re-entry process of reusable vehicles, this poses new requirements and challenges for the design of guidance laws. At present, reentry guidance ...

Claims

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Application Information

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IPC IPC(8): G05D1/12
CPCG05D1/12
Inventor 林海兵都延丽刘武唐明明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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