JPH04184099A - Method for setting missile trajectory - Google Patents

Abstract

PURPOSE:To enable the most appropriate trajectory to be set up to a reaching point at a real time basis even during a flying of a missile by a method wherein a missile initial condition measured and a trajectory with a condition approximate to a target reaching point are selected from a plurality of predetermined reference missile trajectories and then an interpolation calculation is carried out. CONSTITUTION:The most appropriate trajectory interpolation calculation part 4 in the most appropriate missile trajectory setting part 6 sets initial conditions (altitude, trajectory angle, speed)on the basis of a missile target data, selects more than two trajectories relatively approximating to the initial conditions and the target reaching point from a trajectory data memory 5 of the reference missile. It further selects more than two paths having short reaching time up to the target. As regards the selected reference missile trajectory data, each of the initial conditions and the target reaching point are compared with the initial conditions got through the missile target data and the target reaching point got by the target set data, an interpolation calculation is carried out and an actual most appropriate missile trajectory is calculated. The got most appropriate missile trajectory is inputted to a guiding calculation part 7 and the calculation part 7 perform a guiding of the missile.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for setting a flight path that is applied to a guidance system for a flying object.

[Conventional technology]

In conventional guidance systems for flying objects, when setting the optimal flight path for a flying object, just before launch,
Alternatively, optimal route calculations are not performed during flight, or correction calculations are performed sequentially using other calculation methods.

[Problem to be solved by the invention]

In the conventional setting of the flight path of a flying object, the flight path is determined and set as the solution to an optimal control problem using the maximum speed of the flying object or the minimum arrival time when reaching the target point as an evaluation measure (evaluation function). There were many things.

These optimal paths are the launching points (or starting points for path correction)
The optimal route is selected from among the countless flight routes from to the target point, which requires a huge amount of calculation. This makes it difficult to perform recalculations for path correction while the projectile is in flight.

In conventional methods, it is difficult to calculate in a timely manner in real time, so the route must not be modified or the route must be modified sequentially using another calculation method. In some cases, the deviation from the route was so large that it could not be ignored.

The present invention seeks to solve the above problems.

[Means to solve the problem]

The flight path setting method of the present invention involves determining in advance a plurality of reference layer flight paths corresponding to various initial conditions and target points of the projectile, and then using the actually measured initial conditions and target points of the projectile. The present invention is characterized in that a reference layer route close to the above-mentioned reference layer route is selected from the reference layer body routes determined in advance, and further, an interpolation calculation is performed on the selected reference layer route to obtain an optimal layer body route. There is.

[Effect]

In the above, when the flying object attempts to fly, the initial conditions and target destination of the flying object are measured, and the initial conditions and target destination of each of the plurality of reference layer paths set in advance are measured. A comparison is made, and a reference layer route with similar values is selected.

Regarding the reference layer route selected above, interpolation calculation is performed based on the above-mentioned initial conditions of the projectile and the values of the target destination, and an optimal layer route is determined.

As described above, the optimal route for the projectile is set by simple interpolation calculation of the reference layer path data calculated in advance, so the optimal route to the destination point can be determined in real time even while the projectile is in flight. Settings are now possible.

〔Example〕

An apparatus according to an embodiment of the present invention will be explained with reference to FIG.

The apparatus according to this embodiment shown in FIG. a predicted arrival point calculation section 3 which inputs the predicted arrival point calculation section 3, which inputs the above-mentioned spacecraft orientation data and target orientation data; It is equipped with an optimal layer route setting section 6 comprising a route data memory 5, and a steering calculation section 7 into which the output signal of the optimal route interpolation calculation section 4 is input.

In the above, the reference layer route data memory 5 of the optimal layer route setting unit 6 stores various reference layer route data obtained by optimal layer route calculation using the initial conditions of the flying object and the target destination as parameters. are stored together with their respective initial conditions and goals.

Optimal route interpolation calculation unit 4 of the optimal layer route setting unit 6
The initial conditions for route calculation (altitude, route angle, speed) are set based on the aircraft orientation data, and the initial conditions are selected from among the various reference layer route data stored in the reference layer route data memory 5. Two or more routes are selected that have relatively similar conditions and goal destinations, and two or more routes that take the shortest time to reach the goal are selected.

Regarding the selected reference layer route data, the optimum route interpolation calculation unit 3 calculates the respective initial conditions and target arrival points from the initial conditions and target orientation data obtained from the projectile orientation data. It is compared with the target destination, interpolation calculations are performed, and the actual optimal layer path is calculated.

Regarding the above interpolation calculation, there are two methods:
As shown in FIG. 2, some reference points are provided on each reference layer route.

In order to perform the above-mentioned interpolation calculation, the data stored in the reference layer route data memory 5 includes the altitude, velocity, route angle, and destination point position of the flying object, as well as the respective standards when using an approximate formula. The approximation coefficient and flight time of the route are memorized, and in the case of reference point setting, the reference point position coordinates and arrival time to the reference point are memorized, and in interpolation calculations, the former is the approximation coefficient, and the latter is the reference point and arrival time. Time is interpolated.

The optimum layer route obtained by the optimum layer route setting section 6 is input to the guidance calculation section 7, which guides the flying object.

As described above, the optimum route for the projectile is set by simple interpolation calculation of the reference layer path data calculated in advance. Settings are now possible.

〔Effect of the invention〕

The flight route setting method of the present invention involves selecting a route with conditions close to the measured initial conditions of the projectile and the target destination from a plurality of preset reference flight routes, and performing interpolation calculations. By this, it is possible to set the optimal route to the destination point in real time even when the projectile is in flight, and it is possible to improve the optimality of the route when no route correction is performed, and when correction is made. The conventional sequential correction calculation becomes unnecessary.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an apparatus according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram of reference flight route data according to the above embodiment. 1... Projectile location unit, 2... Target location unit, 3
... Predicted destination calculation section, 4. Optimal route interpolation calculation section, 5. Reference flight route data memory, 6. Optimal flight route setting section, 7. Guidance calculation section.

Claims (1)

[Claims] A plurality of reference flight paths corresponding to various initial conditions and destination points of the projectile are determined in advance, and the reference flight path whose actual measured initial conditions and destination point of the projectile are close to those shown above is determined in advance. A method for setting a flight path, which comprises selecting from among predetermined standard flight paths, and further performing interpolation calculations on the selected standard flight path to obtain an optimal flight path.