CN110412555B

CN110412555B - Riemann curved surface-based aerial target indication correction method

Info

Publication number: CN110412555B
Application number: CN201910657743.9A
Authority: CN
Inventors: 陆翔; 匡华星; 王志刚; 陈春林; 王谦诚; 朱灿; 王奇; 姚远; 王犇
Original assignee: 724th Research Institute of CSIC
Current assignee: 724th Research Institute of CSIC
Priority date: 2019-07-20
Filing date: 2019-07-20
Publication date: 2022-05-17
Anticipated expiration: 2039-07-20
Also published as: CN110412555A

Abstract

The invention relates to an aerial target indication correction method based on a Riemann curved surface. Aiming at the adverse effect of over-the-horizon on the target indication of the sea-sweeping target caused by the earth curvature under the sea observation condition, the invention provides a Riemann curved surface-based air target indication correction method for eliminating target indication errors, which comprises the following specific steps: firstly, distance, azimuth and elevation information of an observation target of the platform and precision latitude and height information of the platform are obtained. And secondly, executing an beyond-visual-range sea-eye-grazing finger conversion method. Solving the height of the target according to the longitude and latitude height of the platform and the azimuth angle, the pitch angle and the distance of the target relative to the platform; and on the geodesic plane, solving the longitude and latitude of the target according to the longitude and latitude height of the platform and the azimuth angle, pitch angle and distance of the target relative to the platform. And finally, outputting a sea-sweeping target indication result.

Description

Riemann curved surface-based aerial target indication correction method

Technical Field

The invention relates to a modified target indication method.

Background

The target indication method is a method for calculating and obtaining the longitude and latitude position information of a target by an observation station according to the longitude and latitude position information of the station and the distance, azimuth and elevation information of the target observed by the station. Under the beyond visual range observation scene, the target is far away from the observation platform, and the target is positioned below the sea horizon line from the observation of the observation station. Under the scene, only the over-the-horizon radar is adopted, and the small target below the sea horizon can be detected by utilizing the refraction effect of the atmospheric waveguide. In the traditional target indicating method, a connecting line between a target and an observation station is regarded as a straight line, and the observation position of the target is obtained by calculating through a trigonometric calculation method according to the position of the station and the relative position of the station and the target.

The following problems exist in performing over-the-horizon target indication using conventional methods: the traditional target indication method does not consider the influence caused by the curvature of the earth under the over-the-horizon condition, and the curve propagation of electromagnetic waves caused by the refraction effect of the atmospheric waveguide under the over-the-horizon observation condition is equivalent to straight line propagation, so that the target position obtained by target indication calculation has deviation from the real position of the target in the measurement quantities such as distance, direction, pitching and the like, and the deviation is obviously increased along with the increase of the distance between the target and an observation station. When high-precision target tracking is required, the traditional target indication method resolving method cannot guarantee the converted target indication precision, for example, when an observation platform performs over-the-horizon observation on a small sea-sweepback aircraft target, the target indication deviation is larger than one target position, and adverse effects such as target loss and target interception failure of subsequent cooperative target indication handover are caused.

Disclosure of Invention

The invention aims to overcome a cross-platform target indication error caused by the curvature of the earth, and provides an aerial target indication correction method based on a Riemann curved surface by comprehensively considering the characteristic of spherical surface angle overshoot.

The technical scheme of the invention is as follows: obtaining distance and direction pitching information of the platform observation target and distance and direction pitching information of the platform observation cooperative platform; executing an beyond-visual-range cross-platform eye-finger conversion method; and outputting a cooperative platform target indication result. The method for executing beyond visual range glancing sea-eye finger conversion is as follows: firstly, on the earth plane (attached to the ground plane), solving the azimuth angle theta of the target observed by the platform according to the target and the longitude and latitude of the platform_outAnd geodetic distance R⁽¹⁾(ii) a Then, considering the definition of the distance in the space of the ground, according to the target and the local meanGeodesic distance R of the table⁽¹⁾Solving the distance R between the target and the platform⁽²⁾(ii) a Finally, the earth curvature is considered, and the pitch angle of the platform observation target is solved according to the target and the platform height

Drawings

Fig. 1 is a schematic diagram of an air target indication correction method based on a riemann curved surface.

FIG. 2 is a schematic diagram of solving the altitude of the target according to the longitude and latitude height of the platform and the azimuth angle, pitch angle and distance of the target relative to the platform.

Fig. 3 is a schematic diagram of solving the longitude and latitude of the target according to the longitude and latitude height of the platform and the azimuth, pitch angle and distance of the target relative to the platform.

Fig. 4 is a schematic diagram of a specific implementation of the air target indication correction method based on the riemann curved surface.

Detailed Description

The implementation process and the software flow are shown in fig. 3 and described as the following processes.

Step 1: obtaining distance, azimuth and pitch information of an observation target of the platform and precision latitude and height information of the platform;

step 2: according to the platform longitude and latitude height (long)₁,lat₁,h₁) And the azimuth angle theta of the target relative to the platform_outAnd a pitch angle

Distance R⁽²⁾Solving the included angle w between the platform and the geocentric object₀Is composed of

And step 3: solving for the target height h₂：

And 4, step 4: according to the included angle w between the local platform and the geocenter and the target₀Determining the geodesic distance R between the target and the observation site⁽¹⁾Comprises the following steps:

R⁽¹⁾＝w₀·R_ground；

And 5: solving for target longitude Long₂And target latitude lat₂

θ＝90°-θ_out

If theta is more than 0 and less than or equal to 90 degrees, L is_{Warp beam}＝L_{Warp beam}，L_{Weft yarn}＝L_{Weft yarn}

If theta is more than 90 degrees and less than or equal to 180 degrees, L is_{Warp beam}＝-L_{Warp beam}，L_{Weft yarn}＝L_{Weft yarn}

If theta is more than 180 degrees and less than or equal to 270 degrees, L is_{Warp beam}＝-L_{Warp beam}，L_{Weft yarn}＝-L_{Weft yarn}

If theta is more than 270 degrees and less than or equal to 360 degrees, L is_{Warp beam}＝L_{Warp beam}，L_{Weft yarn}＝-L_{Weft yarn}Target latitude lat₂Comprises the following steps:

target longitude Long₂Comprises the following steps:

step 6: and outputting a sea-sweeping target indication result.

Claims

1. An air target indication correction method based on a Riemann curved surface is characterized in that:

step 1: obtaining distance azimuth pitching information of the observation target of the platform and longitude latitude height information of the platform, and recording the radius of the earth as R_Ground；

Step 2: according to the longitude and latitude height (long) of the platform₁,lat₁,h₁) And azimuth angle theta of target relative to the platform_outAnd a pitch angle

Distance R⁽²⁾Solving the included angle w between the platform and the geocentric object₀:

And step 3: according to the included angle w between the local platform and the geocenter and the target₀Solving for the target height h₂:

And 4, step 4: according to w₀Determining the geodesic distance R between the target and the observation site⁽¹⁾Comprises the following steps:

R⁽¹⁾＝w₀·R_ground；

And 5: according to the longitude and latitude height (long) of the platform₁,lat₁,h₁) And the azimuth angle theta of the target relative to the platform_outAnd a pitch angle

Distance R⁽²⁾Solving for the target longitude Long₂And target latitude lat₂:

θ＝90°-θ_out，

If theta is more than 0 and less than or equal to 90 DEG, then L_{Warp beam}＝L_{Warp beam}，L_{Weft yarn}＝L_{Weft yarn}，

If theta is more than 90 degrees and less than or equal to 180 degrees, L is_{Warp beam}＝-L_{Warp beam}，L_{Weft yarn}＝L_{Weft yarn}，

If theta is more than 180 degrees and less than or equal to 270 degrees, L is_{Warp beam}＝-L_{Warp beam}，L_{Weft yarn}＝-L_{Weft yarn}，

If theta is more than 270 degrees and less than or equal to 360 degrees, L is_{Warp beam}＝L_{Warp beam}，L_{Weft yarn}＝-L_{Weft yarn}，

Target latitude lat₂Comprises the following steps:

target longitude Long₂Comprises the following steps:

and 6: outputting sea-sweeping target indication result Long₂、lat₂、h₂。