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CN104730499A - Detection performance trial flight verification method for onboard meteorological radar - Google Patents

Detection performance trial flight verification method for onboard meteorological radar Download PDF

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Publication number
CN104730499A
CN104730499A CN201310704104.6A CN201310704104A CN104730499A CN 104730499 A CN104730499 A CN 104730499A CN 201310704104 A CN201310704104 A CN 201310704104A CN 104730499 A CN104730499 A CN 104730499A
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CN
China
Prior art keywords
radar
meteorological
target
weather radar
meteorological target
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201310704104.6A
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Chinese (zh)
Inventor
涂如欣
刘选民
梁相文
于天超
崔冰凌
刘刚利
杨涛
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Chinese Flight Test Establishment
Original Assignee
Chinese Flight Test Establishment
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Filing date
Publication date
Application filed by Chinese Flight Test Establishment filed Critical Chinese Flight Test Establishment
Priority to CN201310704104.6A priority Critical patent/CN104730499A/en
Publication of CN104730499A publication Critical patent/CN104730499A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/95—Radar or analogous systems specially adapted for specific applications for meteorological use
    • G01S13/953—Radar or analogous systems specially adapted for specific applications for meteorological use mounted on aircraft
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G01S7/4004—Means for monitoring or calibrating of parts of a radar system

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Electromagnetism (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention relates to the field of radar, and provides a detection performance trial flight verification method for onboard meteorological radar. The detection performance trial flight verification method for the onboard meteorological radar is used for verifying or calibrating the onboard meteorological radar. According to the technical scheme, the detection performance trial flight verification method for the onboard meteorological radar includes the steps that a radar image of the on-board meteorological radar for an aerial weather target is recorded in the trial flight; the position of the weather target detected by ground meteorological radar and radar echo intensity of the weather target are extracted and converted to an onboard meteorological radar coordinate system to generate a reference map; the reference map is compared with the image, recorded in the trial flight, of the onboard meteorological radar.

Description

A kind of airborne weather radar detection performance Flight method
Technical field
The present invention relates to field of radar, particularly relate to a kind of airborne weather radar detection performance Flight method.
Background technology
Airborne weather radar is the airborne radar for detecting sexual intercourse state and other air weather key elements, can measure and show the regions such as the thunderstorm in carrier aircraft front, storm or turbulent area.
Meteorological target develops continuous change in time, and impersonal force is controlled, therefore airborne weather radar is taken a flight test and is lacked checking benchmark (comprising: each point radar echo intensity, speed etc. in the distribution of meteorological target location, target) in the past, only can carry out qualitative examination to air weather target detection.
Summary of the invention
The technical problem to be solved in the present invention: a kind of airborne weather radar detection performance Flight method is provided, Flight or calibration can be carried out to airborne weather radar.
Technical scheme of the present invention: a kind of airborne weather radar detection performance Flight method, comprising:
To take a flight test the radar picture of middle logging machine airborne weather radar for air weather target;
Extract the position of meteorological target and the radar echo intensity of this meteorological target of surface Weather radar detection, the radar echo intensity of described meteorological target location and this meteorological target is transformed into airborne weather radar coordinate system generation reference map;
Compare with the airborne weather radar picture of described reference map to middle record of taking a flight test.
Beneficial effect of the present invention: the present invention utilizes the surface Weather radar detection result of existing meteorological department or test base erection, such surface Weather radar detection precision is 0.1dBz ~ 0.5dBz, current airborne weather radar detection accuracy is 2.5dBz ~ 5dBz, meets the requirement that reference precision is better than tested system accuracy more than 3 times.Surface Weather radar detection result is adopted to be benchmark, qualitative assessment can be carried out to the accuracy of airborne weather radar detection of a target position, intensity, shape, solving in the past can not the problem of qualitative assessment airborne weather radar detection performance, had filled up the blank of China's airborne weather radar detection performance Flight method.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a kind of airborne weather radar detection performance of the present invention Flight method.
Fig. 2 is the idiographic flow schematic diagram of step 102 in Fig. 1.
Embodiment
A kind of airborne weather radar detection performance of the present invention Flight method, as shown in Figure 1, specifically comprises:
S101, the radar picture of middle logging machine airborne weather radar for air weather target of taking a flight test.
The radar picture of the meteorological target of record comprises the radar echo intensity of meteorological target location and meteorological target.Described radar echo intensity uses baseis reflectivity to represent on meteorology, is directly proportional to precipitation particles diameter 6 power in meteorological target unit volume, and its value size reflects yardstick and the Density Distribution of meteorological target internal precipitation particles, and unit is dBz.
S102, the position of meteorological target of extracting surface Weather radar detection and the radar echo intensity of this meteorological target, be transformed into airborne weather radar coordinate system and generate reference map by the position of described meteorological target and the radar echo intensity of this meteorological target.
Surface Weather radar and airborne weather radar use coordinate system different, cause same meteorological target different with the coordinate figure of airborne weather radar at the coordinate figure of surface Weather radar, need the position of the meteorological target of surface Weather radar detection and radar echo intensity thereof to be transformed into airborne weather radar coordinate system and generate the reference map comprising meteorological target location and radar echo intensity thereof.
S103, to compare with described reference map and the airborne weather radar picture of middle record of taking a flight test.
Because the detection accuracy of surface Weather radar is better than airborne weather radar, so the position of meteorological target, intensity and shape can be detected with the checking of described reference map or adjusting machine airborne weather radar.
Wherein, step 102 as shown in Figure 2, specifically comprises:
S1021, the meteorological target of surface Weather radar detection, obtain the position of described meteorological target in geocentric rectangular coordinate system and radar echo intensity.
Geocentric rectangular coordinate system is defined as: initial point O goverlap with earth centroid, Z gaxle points to the earth arctic, X gaxle points to the intersection point of this first meridian ellipse (O ° through coil) and earth equatorial plane, Y gaxle is perpendicular to X go gz gthe right-handed coordinate system that plane is formed.
S1022, the position of meteorological target is transformed into carrier aircraft inertial coordinates system from geocentric rectangular coordinate system, the position of meteorological target and radar echo intensity under obtaining carrier aircraft inertial coordinates system.
Inertial coordinates system is defined as: with certain a bit for the geographic coordinate system of initial point, its X-axis and Y-axis point to Zheng Bei and Zheng Xi respectively, and (X, Y, Z) meets right-handed coordinate system rule, and this kind of coordinate system is also called northwest (NW) sky coordinate system.
S1023, by the position of target meteorological under carrier aircraft inertial coordinates system and radar echo intensity, be transformed into airborne weather radar coordinate system.
Airborne weather radar coordinate system is defined as: with radar antenna center for true origin O, is 0 °, position angle, is clockwise just, the two-dimentional polar coordinate system be made up of position angle A and distance R with carrier aircraft flight-path angle.
In ordinate transform process, the radar echo intensity of meteorological target is constant.
Before the present invention occurs, there are a kind of cognitive mistaken ideas in existing airborne radar field of detecting, namely, the result of detection of face weather radar is not verified or calibrates airborne radar detection result practicably, even if because for the same detection of a target, due to the difference of detection angle and position, the shape of surface Weather radar and the airborne radar detection of a target and strength difference can be caused too large, the two does not possess comparability, so still do not have effective means can carry out qualitative assessment to airborne weather radar Effect on Detecting at present.But inventor studies discovery, the radar echo intensity detected for meteorological target (precipitation, thunderstorm etc.) is (existing Weather Radar intensity to meteorological target unit volume in 6 powers of precipitation particles diameter is directly proportional) positively related to precipitation particles in meteorological target unit volume.Irrelevant for the radar echo intensity of meteorological target and detection angle, distance, surface Weather radar detection result can be adopted completely to be benchmark, qualitative assessment is carried out to the accuracy of airborne weather radar detection of a target position, intensity, shape, shown by flight test, the method is reasonable, feasible.Instant invention overcomes prior art prejudice, filled up the blank of China's airborne weather radar detection performance Flight method, be applicable to checking or the calibration of the airborne radar of all band aerological sounding functions.
With an embodiment, technical solution of the present invention is illustrated below:
The first step: when having the meteorological targets such as cumulonimbus, medium above precipitation or thunderstorm in spatial domain of taking a flight test, arranges carrier aircraft at the meteorological target flight of the outer subtend of safe distance.
Second step: logging machine airborne weather radar picture, record carrier aircraft position (longitude, latitude, elevation), flight-path angle data.
3rd step: extract the surface Weather GPR Detection Data that area appears in meteorological target, the position of the meteorological target of surface Weather radar detection and radar echo intensity thereof are transformed into airborne weather radar coordinate system.
Pitching, the azimuth-range of meteorological target are arrived in surface Weather radar detection self, according to this surface Weather radar from the coordinate parameters in geocentric rectangular coordinate system, calculate the position (X of meteorological target in geocentric rectangular coordinate system g, Y g, Z g).
By the airborne weather radar picture moment, extract carrier aircraft latitude and longitude coordinates (B c, L c, H c), wherein, B cfor latitude, L cfor longitude, H cfor elevation, obtain the position (X of carrier aircraft in geocentric rectangular coordinate system according to formula (1) c, Y c, Z c),
X C = ( N + H C ) · cos B C · cos L C Y C = ( N + H C ) · cos B C · sin L C Z C = [ N · ( 1 - e 2 ) + H C ] · sin B C - - - ( 1 )
Wherein: N is the radius of curvature in prime vertical of reference ellipsoid
E is the first excentricity of reference ellipsoid
A and b is respectively major radius and short radius a=6378137, the b=6356751.957 of reference ellipsoid.
Afterwards, the position (X of meteorological target in carrier aircraft inertial coordinates system is obtained according to formula (2) t, Y t, Z t).
X T Y T Z T = - sin B C · cos L C - sin B C · sin L C cos B C sin L C - cos L C 0 cos B C · cos L C cos B C · sin L C sin B C · X G - X C Y G - Y C Z G - Z C - - - ( 2 )
By the airborne weather radar picture moment, extract carrier aircraft flight-path angle TA.The position (A, R) of meteorological target in airborne weather radar coordinate system is obtained according to formula (3).
A = 2 gπ - arccos ( X T / X T 2 + Y T 2 ) - TA ( Y T > 0 ) arccos ( X T / X T 2 + Y T 2 ) - TA ( Y T ≤ 0 ) - - - ( 3 )
R = X T 2 + Y T 2 + Z T 2
By the position (A, R) of meteorological target in airborne weather radar coordinate system, demarcate the radar echo intensity of meteorological target, described radar echo intensity is the radar echo intensity of surface Weather radar detection.
4th step: position and the radar echo intensity data thereof of choosing the meteorological target in airborne weather radar range, carries out color grading quantification by radar echo intensity, obtains reference map;
5th step: use reference map, the accuracy of airborne weather radar detection of a target position, intensity, shape is assessed.

Claims (2)

1. an airborne weather radar detection performance Flight method, is characterized in that, comprising:
To take a flight test the radar picture of middle logging machine airborne weather radar for air weather target;
Extract the position of meteorological target and the radar echo intensity of this meteorological target of surface Weather radar detection, the radar echo intensity of described meteorological target location and this meteorological target is transformed into airborne weather radar coordinate system generation reference map;
Compare with the airborne weather radar picture of described reference map to middle record of taking a flight test.
2. a kind of airborne weather radar detection performance Flight method as claimed in claim 1, it is characterized in that, extract the position of meteorological target and the radar echo intensity of this meteorological target of surface Weather radar detection, the step that the radar echo intensity of described meteorological target location and this meteorological target is transformed into airborne weather radar coordinate system comprised:
The meteorological target of surface Weather radar detection, obtains the position of described meteorological target in geocentric rectangular coordinate system and radar echo intensity;
The position of meteorological target is transformed into carrier aircraft inertial coordinates system from geocentric rectangular coordinate system, the position of meteorological target and radar echo intensity under obtaining carrier aircraft inertial coordinates system;
By the position of target meteorological under carrier aircraft inertial coordinates system and radar echo intensity, be transformed into airborne weather radar coordinate system.
CN201310704104.6A 2013-12-19 2013-12-19 Detection performance trial flight verification method for onboard meteorological radar Pending CN104730499A (en)

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CN105501464A (en) * 2015-12-16 2016-04-20 成都赫尔墨斯科技有限公司 Method for testing performance of aviation airborne radio communication and navigation system during test flight
CN107153177A (en) * 2017-06-28 2017-09-12 中国航空工业集团公司雷华电子技术研究所 A kind of verification method of airborne weather radar rainfall result of detection
CN113687324A (en) * 2021-10-26 2021-11-23 南京恩瑞特实业有限公司 Phased array weather radar calibration machine external verification system

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105501464A (en) * 2015-12-16 2016-04-20 成都赫尔墨斯科技有限公司 Method for testing performance of aviation airborne radio communication and navigation system during test flight
CN107153177A (en) * 2017-06-28 2017-09-12 中国航空工业集团公司雷华电子技术研究所 A kind of verification method of airborne weather radar rainfall result of detection
CN107153177B (en) * 2017-06-28 2021-02-19 中国航空工业集团公司雷华电子技术研究所 Method for verifying rainfall detection result of airborne weather radar
CN113687324A (en) * 2021-10-26 2021-11-23 南京恩瑞特实业有限公司 Phased array weather radar calibration machine external verification system

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