RU2733329C1 - Method of calculating firing settings of a guided projectile with a laser semi-active homing head in cloud conditions - Google Patents

Abstract

FIELD: military equipment.

SUBSTANCE: invention relates to military equipment, in particular to guided artillery projectiles (GAP) and guided missiles with laser half-active homing heads (HH). Method for calculating firing settings of a guided projectile with a laser semi-active HH in cloud conditions includes inputting a target and instruments into the coordinate command console, as well as values of ballistic corrections, measurement and subsequent input of atmospheric pressure, temperature, speed and direction of wind into commander's console, measurement of height of lower boundary of cloudiness and input of its value into commander's panel, calculation in command console of firing settings, determination of guided missile trajectory height under current conditions and calculated firing installations, determination of trajectory height in target capture time of target HH of projectile, comparison of flight height of guided projectile with height of terrain, adjustment of firing settings taking into account this comparison. For the given terrain relief, the calculated flight path of the guided projectile is compared at the calculated moment of capturing the target HH with the height of the lower cloud boundary and, if it exceeds the height of the lower cloud boundary, firing settings are selected from the memory of the commander's console and simultaneously meet requirements that the height of the trajectory of the projectile at the calculated moment of capturing the target HH does not exceed the height of the lower boundary of the cloud and the height of the trajectory of the flight of the shell exceeds the altitude of the terrain on the entire trajectory of the missile's flight. If these conditions are not met, firing settings are selected from the memory of the commander's console with the height of the trajectory of the missile above the relief height, and a warning on reducing the probability of falling of the projectile due to low clouds is issued to the screen of the commander's panel.

EFFECT: high probability of GAP target striking due to formation of a rational flight trajectory of the projectile depending on cloud height and terrain features.

1 cl, 1 dwg

Description

The proposed invention relates to military equipment, in particular to guided artillery shells (UAS) and guided missiles with laser semi-active homing heads (GOS).

The invention can be used in guided weapon systems to engage single and group mobile and stationary ground and surface small targets.

An analogue of the proposed invention is a method for calculating firing settings (patent RU No. 2359214), which consists in the fact that before firing in the commander's console, the firing settings and the activation times of the on-board UAS systems are calculated according to the firing table in accordance with the target and gun coordinates entered into the commander's console, meteorological data and ballistic corrections, and the setting of the activation times of the UAS onboard systems (flight mission) is carried out by transferring the calculated values to the UAS electronic equipment memory unit via a digital communication channel installed between the commander's console and the UAS electronic equipment memory unit.

Also known is a method for calculating firing installations with a laser semi-active homing head (patent RU No. 2300726), which we have chosen as a prototype.

This method consists in entering the coordinates of the target and weapons, as well as the values of ballistic corrections into the commander's console, measuring and then entering the atmospheric pressure, temperature, wind speed and direction into the commander's console, calculating in the commander's console of firing settings, determining the height of the trajectory of a controlled projectile at current conditions and calculated firing settings, comparing the height of the trajectory of the controlled projectile with the height of the terrain and adjusting the firing settings taking into account this comparison.

The disadvantage of methods for calculating firing settings both in analog and in the prototype is that when calculating firing settings and flight missions, the cloud height is not taken into account, which can adversely affect when firing a UAS with a semi-active laser homing head. In low cloud conditions, the target may be outside the capture zone of the seeker at the moment the UAS leaves the cloud layer due to random deviations of the projectile trajectory caused by external disturbances acting during autonomous flight. This disadvantage is significant, since it can lead to the loss of the UAS and failure to fulfill the combat mission.

In this regard, it is urgent to develop such a method for calculating firing settings, which would take into account the conditions of the terrain and the height of the cloud base.

The objective of the invention is to increase the probability of hitting the UAS target due to the formation of a rational trajectory of the projectile flight, depending on the height of the clouds and the features of the terrain.

The solution to this problem is achieved due to the fact that in the known method of calculating the firing settings of a guided projectile with a laser semi-active seeker in cloudy conditions, which includes entering the target coordinates and weapons into the commander's console, as well as the values of ballistic corrections, measuring and then entering atmospheric pressure into the commander's console, temperature, wind speed and direction, calculation in the commander's console of the firing settings, determining the height of the trajectory of the guided projectile under current conditions and the calculated firing settings, comparing the height of the trajectory of the guided projectile with the height of the terrain, adjusting the firing settings taking into account this comparison, with a new is that before the start of the calculation, the height of the cloud base is measured and its value is entered into the commander's console, when determining the heights of the flight trajectory of a controlled projectile, the height of the trajectory at the calculated moment of target acquisition of the seeker of the projectile is additionally determined, for a given relief of places The calculated height of the flight trajectory of the controlled projectile at the calculated moment of target acquisition by the seeker with the height of the lower cloud limit is compared, and if it exceeds the height of the lower cloud limit, the firing settings are selected from the commander's console that simultaneously meet the following requirements:

- the height of the trajectory of the projectile's flight at the calculated moment of target engagement by the seeker does not exceed the height of the cloud base;

- the height of the trajectory of the projectile exceeds the height of the terrain along the entire trajectory of the projectile;

and if these conditions are not met, the firing settings with the minimum height of the projectile's trajectory exceeding the height of the terrain are selected from the memory of the commander's console, and a warning is issued on the commander's console about a decrease in the probability of a projectile hit due to low cloud cover.

This method is illustrated in FIG. 1, which shows the flight trajectories of the UAS at a given range, depending on the selected firing settings and parameters of the flight task.

The method for calculating the firing setups for a guided projectile with a semi-active laser seeker in cloudy conditions is implemented as follows.

Before shooting, the height of the cloud base in the target area is determined. To do this, a laser designator-rangefinder (LCD) measures the range to clouds at an angle of ~ 30 ° in the direction of the target and calculates the height of the cloud base according to the dependence:

H _NGO = 0.5⋅D _LCD ,

where D _LCD is the range measured by the LCD.

Meteorological training is carried out in accordance with the Rules for Shooting and Artillery Fire Control.

The received data, as well as coordinates and heights of dangerous shelter ridges are entered into the commander's console. As the constant information is stored in the remote commander aerodynamic, ballistic, energy, and the inertial-mass characteristics of the munition, and depending on the flight mission parameters calculated firing range _DI.

Determination of settings for firing and parameters of the flight task is carried out in the commander's console by integrating the differential equations of projectile motion in accordance with GOST B 24288-80 under the actual firing conditions.

The presence of controls allows, by choosing the appropriate flight mission, to form, when firing at the same target, different types of trajectories, depending on the characteristics of the combat mission being solved.

The ability to form trajectories of the desired shape can be used to fulfill conflicting requirements: overcoming shelter ridges (requires an increase in the trajectory height) and the maximum length of the homing section in the presence of low clouds (requires a decrease in the trajectory).

For this purpose, in the system of constants of the algorithm for integrating the differential equations of the projectile motion in the commander's console, several options for the dependences of the settings for firing and the parameters of the flight task on the calculated flight range are created, which correspond to the different heights of the trajectories determined by them:

sight

onboard systems activation times (flight task parameters)

In particular, the set of dependencies t ^P _Ktr, n _{Ktr (DI)} can be specified for UAS with the scheduling portion.

The set of constants is determined by its number "Ktr", which takes integer values from 0 to n, where n is the number of options stored in the commander's console. The dependencies stored in the commander's console make it possible to form the entire possible set of UAS trajectories from the minimum (Ktr = 0) to the maximum (Ktr = n) height, which is illustrated in Fig. 1.

Determination of firing settings is carried out by constructing an incoming trajectory, taking into account the restrictions on the height of the clouds and the ridges of the shelter. In a first approximation, the trajectory is calculated at _D = D D _I, D ₁ = _T and Ktr = n, where D _T - topographic target range. Then, when performing the 2nd and subsequent approximations, in (1) - (2), as an argument, the next approximation of the calculated range D _{I, S + 1} = D _T - (X _S -D _{I, S} ) is substituted, where X _{S is the} result of calculating the trajectory at D _I = D _{I, S.}

When the condition is met:

| X _S -D _T | <ΔD,

where ΔД is the given accuracy of the solution of the problem, the process of constructing the incoming trajectory ends, otherwise the next approximation with the number S + 1 is performed.

The resulting incoming trajectory is analyzed for constraints.

1) Restriction on shelter ridges:

where X is the horizontal range from the gun,

a (X) is the height of the lowermost trajectory of the UAS taking into account the dispersion;

b (X) - surface height according to electronic map data,

a (X) = Y (X) -Δ ₁ (X),

Y (X) - the height of the falling trajectory,

the value Δ ₁ (X) is set in the table in the system of constants.

2) Limitation on the height of the cloud base:

where a '(X) is the height of the extreme upper trajectory of the UAS taking into account the dispersion, the field of view of the seeker and the size of the zone of the selected misses at the horizontal flight range X = X ₃ , corresponding to the calculated moment of target acquisition;

Н _НСО - the height of the cloud base,

a '(X) = Y (X) + Δ ₂ (X).

The heights are counted from the base surface of the electronic map. The value of Δ ₂ (X) is set in the table in the system of constants.

If conditions (3) and (4) are met simultaneously, the problem of calculating the firing settings and the flight task is considered solved. A shot is fired with the received settings for shooting and a flight mission.

If condition (4) is not fulfilled, the parameter Ktr is decreased by one (Ktr = Ktr-1), the corresponding system of constants is selected, S = 1 is taken, and the problem of calculating the settings for firing and the flight task is solved again. If conditions (3) and (4) are satisfied, the problem is considered solved. If condition (4) is still not satisfied, but (3) is satisfied and Ktr> 0, Ktr is decreased by one more and the process is repeated until condition (4) is satisfied when (3) is fulfilled or Ktr = 0.

If it is impossible to simultaneously fulfill conditions (3) and (4), firing settings are selected that ensure the fulfillment of condition (3) at the lowest Ktr, and a warning is displayed on the commander's console about a decrease in the probability of a projectile hit due to low cloud cover. The target acquisition range is indicated, calculated by the formula: D _ZAH = N _NGO / sin (θ _PODX ), where θ _PODX is the angle of the UAS approach to the target of the falling trajectory, and the nominal range of capture D _{ZAH 0} from the system of constants, which allows the firing leader to estimate the influence of cloudiness on the ability to perform a combat mission.

If at the end of the considered process condition (3) is not met, the message "Possible hitting the shelter ridge" is generated, indicating the coordinates of hitting the ridge.

To implement the method, the devices shown in the prototype can be used.

This method of calculating the firing settings of a guided projectile with a laser semi-active homing head (GOS) in cloudy conditions allows increasing the probability of the UAS hitting the target, eliminating the loss of a projectile on the trajectory and increasing the effectiveness of firing with artillery guided projectiles by taking into account the lower cloudiness and choosing a firing trajectory that takes into account both the terrain and the cloud base.

Claims (4)

A method for calculating the firing settings of a guided projectile with a laser semi-active homing head (GOS) in cloudy conditions, including entering the coordinates of the target and guns, as well as the values of ballistic corrections into the commander's console, measuring and then entering the atmospheric pressure, temperature, wind speed and direction into the commander's console , calculation in the commander's console of the firing settings, determining the height of the trajectory of the guided projectile under current conditions and the calculated firing settings, comparing the height of the flight path of the guided projectile with the height of the terrain, adjusting the firing settings taking into account this comparison, characterized in that the height is measured before the start of the calculation the lower boundary of cloud cover and entering its value into the commander's console, when determining the heights of the flight trajectory of a controlled projectile, the height of the trajectory at the calculated moment of target capture of the seeker of the projectile is additionally determined, for a given terrain the calculated height of the trajectory floor Eta of a guided projectile at the design moment of target acquisition by the seeker with the height of the cloud base and, if it exceeds the height of the cloud base, the firing settings are selected from the commander's console that simultaneously meet the following requirements: - the height of the trajectory of the projectile's flight at the calculated moment of target engagement by the seeker does not exceed the height of the cloud base; - the height of the trajectory of the projectile exceeds the height of the terrain along the entire trajectory of the projectile; and if these conditions are not met, the firing settings with the minimum height of the projectile flight trajectory exceeding the height of the terrain are selected from the memory of the commander's console, and a warning is issued on the commander's console screen about a decrease in the probability of a projectile hit due to low cloud cover.

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