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Doppler radar sea surface speed measurement error correction method

A Doppler radar and error correction technology, applied in the field of radar, can solve the problems of easy fatigue of pilots, large error in speed measurement accuracy, and inability to correct, so as to simplify the operation complexity, improve the speed measurement accuracy, and increase the effect of correction.

Active Publication Date: 2018-12-28
SHAANXI CHANGLING ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two deficiencies in this correction method. On the one hand, due to the change of wind speed on the ocean surface, the pilot needs to manually input parameters frequently, which makes the pilot prone to fatigue due to long-term flight; on the other hand, since the carrier aircraft does not provide correction information The equipment makes it impossible to correct its ocean surface wind, resulting in a large error in the speed measurement accuracy

Method used

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  • Doppler radar sea surface speed measurement error correction method
  • Doppler radar sea surface speed measurement error correction method
  • Doppler radar sea surface speed measurement error correction method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1, given the sea surface wind data, the correction amount is calculated:

[0042] refer to figure 1 , the implementation steps of this embodiment are as follows

[0043] Step 1, set the "Land / Sea" switch mode.

[0044] The carrier aircraft sets the corresponding switch mode according to the flight area, that is, when the carrier aircraft is flying over land, the pilot sets the "land / sea" switch to "land" mode; / Sea" switch to "Ocean" mode. When the Doppler radar beam tracking on the carrier aircraft is normal, the radar outputs the three-axis velocity in the body coordinate system, the forward velocity V x , Lateral velocity V y , vertical velocity V z .

[0045] This example is mainly for the carrier aircraft flying over the sea, that is, the "Land / Sea" switch is set to "Ocean" mode.

[0046] Step 2, correcting the speed measurement error caused by the echo spectrum distortion.

[0047] When the carrier aircraft is flying over the sea, for the Dopple...

Embodiment 2

[0078] Embodiment 2, the unknown ocean surface wind data, the correction amount is calculated

[0079] refer to figure 2 , the implementation steps of this embodiment are as follows

[0080] Step 1, set the "Land / Sea" switch mode.

[0081] Step 2, correcting the speed measurement error caused by the echo spectrum distortion.

[0082] Step 3, obtaining the correction amount of the speed measurement error caused by the ocean current relative to the geographic coordinate system.

[0083] The specific implementation of the above three steps is the same as that of Step 1-Step 3 in Embodiment 1.

[0084] Step 4. Automatically derive ocean surface wind data and calculate the correction amount

[0085] 4.1) When there is no sea surface wind data and the altitude of the aircraft is not greater than 3000 feet, the Doppler radar firstly needs to be based on the altitude Hp of the aircraft and the air wind speed V displayed by the aircraft instrument. aw , air wind direction D aw , l...

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Abstract

The invention discloses a Doppler radar sea surface speed measurement error correction method, aiming to solve the problem of greater error of Doppler radar sea speed measurement in the prior art. Themethod comprises the steps of when a carrier aircraft is over the water, setting a switch of the carrier aircraft to an 'ocean' mode; when a Doppler radar beam tracks normally, correcting a speed measurement error caused by echo spectrum distortion according to a forward speed correction coefficient and a transverse speed correction coefficient; acquiring speed measurement error correction amountbased on a geographic coordinate system caused by an ocean current and ocean surface wind respectively according to ocean data and ocean surface wind data; and converting the speed correction amountbased on the geographic coordinate system into speed correction amount based on an aircraft coordinate system, and performing speed correction. Through adoption of the method, a pilot operates less complexly, Doppler radar marine speed measurement errors are reduced greatly, speed measurement is more accurate, and the method is applicable to Doppler radar sea speed measurement.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a speed measurement error correction method, which can be used for Doppler radar speed measurement at sea. Background technique [0002] When an aircraft flies over the ocean, the speed measured by Doppler radar is greatly affected by the state of the ocean. Compared with flying over land, when flying over the ocean, the ground speed measured by Doppler radar is also affected by two other factors, one is the reflection characteristics of the ocean surface, and the other is the drastic change of the ocean state . [0003] For the Doppler radar radiation beam, the reflection characteristics of the ocean surface are different from those of the land surface. When working on the sea surface, the Doppler radar echo signal spectrum will be distorted, thereby increasing the speed of the Doppler radar. error. [0004] Both currents and winds cause changes in the state of the ocean. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S7/40
CPCG01S7/4021G01S7/41
Inventor 李俊锋何开巍陈晓东岂常春樊稳茹
Owner SHAANXI CHANGLING ELECTRONICS TECH
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