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Signal reflection field calculation method used for sea surface low-angle target radar

A technology of signal reflection and calculation method, applied in the direction of calculation, design optimization/simulation, special data processing application, etc., can solve the problem that the reflection point cannot be specified analytically, the parameters of the direct line and the reflection line are difficult to calculate, etc., to achieve accurate calculation , the effect of precise signal reflection field

Active Publication Date: 2018-09-04
ROCKET FORCE UNIV OF ENG
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Problems solved by technology

However, if only the height of the radar antenna, the height of the target, and the distance between the radar and the target are specified, the position of the reflection point cannot be specified analytically, that is, the distance from the radar to the reflection point and the distance between the target and the reflection point, the straight line and the reflection line cannot be determined analytically. parameters are difficult to calculate

Method used

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  • Signal reflection field calculation method used for sea surface low-angle target radar
  • Signal reflection field calculation method used for sea surface low-angle target radar
  • Signal reflection field calculation method used for sea surface low-angle target radar

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Embodiment

[0026] 1. The basic principle of sea radar wave rays:

[0027] In free space, the radar wave reaches the target with only one ray, that is, the straight ray, and the radar received signal power is:

[0028]

[0029] Where: P t ——transmission power (w)

[0030] G t (θ),G r (θ)——Transmitting and receiving antenna gain, θ is the arrival target pointing angle

[0031] λ——The wavelength of the transmitted signal (m)

[0032] σ t ——Target RCS(m 2 )

[0033] d——target distance (m)

[0034] L(d)—atmospheric attenuation related to distance and related to the elevation angle of the target

[0035] However, at sea level, in addition to the direct line between the radar and the target, there is also a reflection line from the sea surface. figure 1 shown.

[0036] In the low-angle grazing projection, the directivity of the antenna in the direction of the straight ray and the direction of the reflected ray is almost the same, and the reflected RCS of the target is almost const...

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Abstract

The invention discloses a signal reflection field calculation method used for sea surface low-angle target radar. According to the method, an iteration manner is employed, an objective function is setto a logarithm of the ratio of an incidence angle to a reflection angle, iteration of a set initial value of a distance of the radar from a reflection point is further carried out step by step, the distance becomes a distance, which is closest to an actual value, of the radar from the reflection point, and thus accurate calculation and stipulating of a position of the reflection point are realized when only radar antenna height, target height and a distance between the radar and a target are stipulated. In addition, a reflection coefficient of a signal reflection field is further effectivelydetermined through setting the reflection coefficient to the product of a ground reflection coefficient, a diffusion factor and a mirror surface scattering factor, and the purpose of accurately calculating the signal reflection field is achieved.

Description

technical field [0001] The invention relates to a signal reflection field calculation method, in particular to a signal reflection field calculation method for sea surface low-angle target radar. Background technique [0002] In free space, there is only one ray from the radar wave to the target, that is, the straight ray; but at sea level, apart from the straight ray, there is also a sea surface reflection line between the radar and the target, as shown in the attached figure 1 shown. In the low-angle grazing projection, the directivity of the antenna in the direction of the straight ray and the direction of the reflected ray is almost the same, and the reflected RCS of the target is almost unchanged, so the field strength of the reflected ray and the straight ray can be compared. Under the strong interference of the two rays, the receptive field presents a strong fluctuation with distance. [0003] When the height of the radar antenna and the height of the target are det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 魏振华付光远李琳琳伍明占建伟范志良汪洪桥叶霞杨文可屈毓锛李海龙罗眉王利涛
Owner ROCKET FORCE UNIV OF ENG
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