CN-121997572-A - SCR simulation method for meteorological remote sensing radar

CN121997572ACN 121997572 ACN121997572 ACN 121997572ACN-121997572-A

Abstract

A meteorological remote sensing radar SCR simulation method includes the steps of constructing a three-dimensional antenna pattern under a demand side lobe by means of a Taylor window function, constructing a clutter power model in a ground area unit based on remote sensing radar observation geometry, building a mapping relation between the ground surface and the three-dimensional antenna pattern based on the clutter power model in the ground area unit, calculating total ground clutter power, calculating total echo power of a meteorological target based on a meteorological radar equation, and combining the total ground clutter power with echo power of the meteorological target to obtain an SCR distribution curve. The invention is suitable for SCR modeling and simulation of satellite-borne, airborne, boat-borne and other remote sensing platform observation scenes, and provides theoretical basis and simulation support for performance evaluation, antenna parameter design and clutter suppression strategies of a meteorological remote sensing radar system.

Inventors

Jiang Baisen
Yuan Zhengkun
WU PAN
XIA SHUAI
WANG HUI

Assignees

北京遥测技术研究所

Dates

Publication Date: 20260508
Application Date: 20251231

Claims (9)

1. The weather remote sensing radar SCR simulation method is characterized by comprising the following steps of: constructing a three-dimensional antenna pattern under a requirement sidelobe by using a Taylor window function; Constructing a clutter power model in a surface area unit of the meteorological remote sensing radar based on the observation geometry; Based on the clutter power model in the surface area unit, establishing a mapping relation between the surface and the three-dimensional antenna pattern, and calculating the total power of the surface clutter; Calculating the total echo power of a meteorological target based on a meteorological radar equation; and calculating and obtaining SCR distribution curves under different inclined distances according to the ground clutter power and the echo power of the meteorological target.
2. The method for simulating the SCR of the weather remote sensing radar according to claim 1, wherein the three-dimensional antenna pattern under a demand side lobe is constructed by using a Taylor window function, and the method comprises the following steps: Calculating the beam width of a distance directional diagram and an azimuth directional diagram according to the antenna size, wherein the distance directional diagram is a 90-degree slice directional diagram, and the azimuth directional diagram is a 0-degree slice directional diagram; Interpolation calculation of beam widths of different angle slice directional diagrams; And constructing different angle slice directional diagrams by utilizing a Taylor window function according to the beam widths of different angles and the side lobe indexes, so as to obtain the three-dimensional antenna directional diagram under the side lobe of the requirement.
3. The SCR simulation method of weather remote sensing radar as defined in claim 1, wherein the intra-unit clutter power model of the weather remote sensing radar is as follows: 。
4. Wherein R is the distance between the surface area unit and the radar, For the surface backscatter coefficient, A three-dimensional antenna pattern under a requirement sidelobe constructed by utilizing a Taylor window function; for the antenna gain to be high, Is the pitch angle of the antenna coordinate system, For the azimuth angle of the antenna coordinate system, For the radar to transmit peak power, For the radar wavelength to be of the same wavelength, Is a unit of the surface area of the ground, Clutter power from within the ground area cells is received for the antenna.
5. The method for simulating SCR of meteorological remote sensing radar of claim 1, wherein the surface area unit is expressed as Wherein H is the height of the platform, For the radius of the earth, The unit azimuth angle is projected for the earth's surface, And R is the distance between the surface area unit and the radar.
6. The method for simulating SCR of meteorological remote sensing radar according to claim 1, wherein the total power of surface clutter of the meteorological remote sensing radar is , For the antenna gain to be high, For the radar to transmit peak power, For the radar wavelength to be of the same wavelength, A three-dimensional antenna pattern under a requirement sidelobe constructed by utilizing a Taylor window function; for the antenna gain to be high, Is the pitch angle of the antenna coordinate system, Is the azimuth angle of the antenna coordinate system, R is the distance between the surface area unit and the radar, H is the platform height, Is the radius of the earth, h is the radial resolution, For the azimuth angle, For the surface backscattering coefficient corresponding to the angle of incidence i, The unit azimuth angle is projected for the earth's surface, Is the unit distance of the oblique distance.
7. The weather remote sensing radar SCR simulation method as claimed in claim 1, wherein the total echo power of the weather target Where h is the radial resolution, For the antenna gain to be high, For the radar to transmit peak power, For the radar wavelength to be of the same wavelength, A three-dimensional antenna pattern under a requirement sidelobe constructed by utilizing a Taylor window function; is the pitch angle of the antenna coordinate system, For the azimuth angle of the antenna coordinate system, In order for the radar to be reflective, As the beam opening angle of the antenna, And R is the distance between the surface area unit and the radar.
8. A weather remote sensing radar SCR simulation method as defined in claim 3, 5 or 6, wherein, , , Is the fixed angle of the antenna and, For the view angle of the antenna beam, The azimuth angle is projected for the beam ground.
9. The meteorological remote sensing radar SCR simulation method as claimed in claim 1, wherein the signal-to-noise ratio under different inclined distances is satisfied Wherein, the For the total power of the echoes of the meteorological target, Is the total power of the ground clutter.

Description

SCR simulation method for meteorological remote sensing radar Technical Field The invention relates to the technical field of aerospace systems, in particular to a meteorological remote sensing radar signal-to-noise ratio (SCR) simulation method. Background The monitoring and forecasting of typhoons, heavy rain, strong convection and other disastrous weather is one of the core contents in modern meteorological business. Most extreme weather processes are accompanied by the occurrence of clouds and precipitation, which are not only important indicators reflecting the aerodynamic characteristics, but also have a key role in disaster prevention and reduction and global climate change research. Meteorological remote sensing radars are widely used for precipitation monitoring and cloud profile detection tasks as an important tool for acquiring information of the vertical structure of the atmosphere. To extend the range of observation, such systems typically employ a squint scanning mode of operation. However, under medium or high incidence angle conditions, strong surface backscattering can produce significant clutter, especially in the near-surface region. Such clutter can mask the effective echoes of meteorological targets and severely impair the detection capability of the radar for precipitation and cloud structures. For weather remote sensing radars, the weather target is typically located in the near-surface region, and the backscattered echo intensity of the surface is much higher than the echo of the weather target itself, resulting in stronger surface clutter in the main antenna beam. Therefore, the influence of the surface clutter must be fully considered when determining the performance parameters of the weather remote sensing radar. To quantitatively evaluate the influence of the ground clutter on the detection capability of the meteorological remote sensing radar. Disclosure of Invention The technical solution of the invention is to overcome the defects of the prior art, and provide a meteorological remote sensing radar SCR simulation method which can evaluate the detection performance of the radar under different system configuration and observation geometric conditions and provide theoretical basis and simulation support for the design and clutter suppression strategy of the meteorological remote sensing radar. The technical scheme of the invention is as follows: A weather remote sensing radar SCR simulation method comprises the following steps: constructing a three-dimensional antenna pattern under a requirement sidelobe by using a Taylor window function; Constructing a clutter power model in a surface area unit of the meteorological remote sensing radar based on the observation geometry; Based on the clutter power model in the surface area unit, establishing a mapping relation between the surface and the three-dimensional antenna pattern, and calculating the total power of the surface clutter; Calculating the total echo power of a meteorological target based on a meteorological radar equation; and calculating and obtaining SCR distribution curves under different inclined distances according to the ground clutter power and the echo power of the meteorological target. Preferably, the three-dimensional antenna pattern under the side lobe of the requirement is constructed by using a Taylor window function, which comprises the following steps: Calculating the beam width of a distance directional diagram and an azimuth directional diagram according to the antenna size, wherein the distance directional diagram is a 90-degree slice directional diagram, and the azimuth directional diagram is a 0-degree slice directional diagram; Interpolation calculation of beam widths of different angle slice directional diagrams; And constructing different angle slice directional diagrams by utilizing a Taylor window function according to the beam widths of different angles and the side lobe indexes, so as to obtain the three-dimensional antenna directional diagram under the side lobe of the requirement. Preferably, the clutter power model in the meteorological remote sensing radar ground area unit is as follows: Wherein R is the distance between the surface area unit and the radar, For the surface backscatter coefficient,A three-dimensional antenna pattern under a requirement sidelobe constructed by utilizing a Taylor window function; for the antenna gain to be high, Is the pitch angle of the antenna coordinate system,For the azimuth angle of the antenna coordinate system,For the radar to transmit peak power,For the radar wavelength to be of the same wavelength,Is a unit of the surface area of the ground,Clutter power from within the ground area cells is received for the antenna. Preferably, the surface area unit is expressed as Wherein H is the height of the platform,For the radius of the earth,The unit azimuth angle is projected for the earth's surface,And R is the distance between the surface area unit and the rada