CN102854497B

CN102854497B - Method for zero calibration of radar antenna

Info

Publication number: CN102854497B
Application number: CN 201110342344
Authority: CN
Inventors: 赵一倩
Original assignee: NAVAL AVIATION INSTRUMENT METERING STATION PLA
Current assignee: NAVAL AVIATION INSTRUMENT METERING STATION PLA
Priority date: 2011-11-03
Filing date: 2011-11-03
Publication date: 2013-06-05
Anticipated expiration: 2031-11-03
Also published as: CN102854497A

Abstract

The invention provides a method for zero calibration of a radar antenna. Under the conditions of not disassembling a radar unit at an outer field, regular checking and calibration is conducted by creatively adopting a method for comparing optical measurement with radar angle electrical parameter measurement, fault isolation can be conducted after angle tracking parameters in an onboard radar guiding system on site, and whether the zero offset of the radar antenna causes the fault can be judged; in addition, the method can be used for regularly checking the radar antenna, and measurement and zero calibration of mechanical parameter and the electrical parameter of the radar antenna. According to the design, the calibration method solves the difficulty of incapability of calibrating the any positioning angle of the radar antenna.

Description

External field of radar antenna zero calibration steps

Technical field

The invention provides a kind of method that the radar antenna zero-bit is calibrated.

Background technology

The problem that all occurs in various degree the drift of guidance system angle tracking parameter after a period of time is used at present radar assembling aboard, the parameter drift will cause that the guidance correction time increases greatly, problem is serious will cause can't precise search the location, the safety of aircraft has been formed serious threat.

the equipment that guidance system angle tracking parameter drift problem involves is a lot, to state of other on radar antenna angle parameter and carrier aircraft (as inertial navigation etc.) all can be relevant, what at first need to do when radar antenna angle Problem-Error appears in the outfield is isolated fault, determining the end is the problem of miscellaneous equipment in radar antenna self zero shift problem or carrier aircraft, and a shortage that is out at present can judge the equipment of radar self zero-bit parameter in position, return to the maintenance station after radar can only being disassembled and carry out the isolated fault of calibration ability, waste time and energy, large on the aerial mission impact.

Now radar producer has adopted the two transits system to carry out optical measurement in the boresight antenna process, because two transits system equipment amount is huge, uses loaded down with trivial detailsly, has limited its application aspect troubleshooting, calibration.

This patent invention is exactly in order to address this problem, and has launched the research to outfield original position radar antenna Zero Position Calibration Method.

Summary of the invention

A kind of method that the object of the present invention is to provide radar antenna zero-bit to calibrate, the outfield do not dismantle under the condition of radar cell can be in position to the airborne radar guidance system in the angle tracking parameter carry out fault isolation after going wrong, whether can judge is because the radar antenna zero shift has caused this fault; Also can be used for simultaneously the inspection of deciding of radar antenna, mechanical parameter zero-bit and the electrical quantity zero-bit of radar antenna are measured and calibration.

This cover method of testing of application can be confirmed the duty of carrier aircraft guidance system before radar daily servicing and significant task are carried out, and guarantees that carrier aircraft is in good condition, with the success ratio that greatly improves aircraft and execute the task.

In this calibration steps design adoption of innovation general mapping instrument total powerstation radar antenna and radiation electromagnetic horn are carried out optical measurement, can accurately measure the radar antenna angle.

Not professional surveying and mapping personnel's characteristics per family for using in the design, operating process and parameters are calculated to have carried out software integrated, after operating personnel utilize total powerstation to measure to eight monumented points respectively according to software prompt, native system records the three-dimensional coordinate of each point automatically, and carry out a series of line, face, angle match and calculating, finally automatically provide orientation, pitching equal angles parameter, the measurements and calculations mediation process is succinct, need not operating personnel additionally intervenes, greatly reduce operating personnel's specialty and require and workload, increase work efficiency.

In this calibration steps design the employing of innovation the method that compares of optical measurement and radar angle electric parameter measurement carry out deciding inspection and calibration, having solved in the past can't be to the difficult problem of any orientation angle calibration of radar antenna.

Description of drawings

Fig. 1 is measurement point three-dimensional perspective schematic diagram provided by the invention

Fig. 2 is position angle provided by the invention perspective view

Fig. 3 is angle of pitch perspective view provided by the invention

Fig. 4 is that equipment provided by the invention sets up schematic diagram

Embodiment

The on-the-spot schematic diagram that uses is seen Fig. 4, and concrete testing process is as follows:

Approximately set up the radiation electromagnetic horn in 10 meters in distance radar antenna dead ahead, adjust the direction of electromagnetic horn and aim at radar antenna.

Set up target simulator near the radiation loudspeaker, connect the radio-frequency cable between target simulator and radiation loudspeaker, connect the target simulator power supply.

Approximately set up total powerstation in 5 meters in distance radar antenna dead ahead, connect total powerstation and computing machine will data cable.

Open radome, make each monumented point of radar antenna installed surface all visual in the position at total powerstation place.

Open computing machine, carry out following operation according to software prompt.

Open total powerstation, carry out the level zeroing.

Utilize total powerstation in the direction of the clock four monumented points (A, B, C, D) of radar antenna installed surface to be carried out three-dimensional coordinate measurement, simultaneous computer carries out data acquisition.

Utilize total powerstation in the direction of the clock four monumented points (1,2,3,4) of radiation electromagnetic horn to be carried out three-dimensional coordinate measurement, simultaneous computer carries out data acquisition.

The processing stage that after data acquisition, computer software entering data, finally process out position angle and the angle of pitch.(position angle of processing out in this example is 2 degree 20 minutes and 52.2 seconds, and the angle of pitch is 1 degree 49 minutes and 30.4 seconds)

Remove the receipts total powerstation.

Open the target simulator power supply, set the parameters such as corresponding frequency of operation, speed, distance.

Open radar and enter radiation regimes.

Radar to the target that target simulator generates search for, the lockon and follow operation.

Record position angle and the angle of pitch parameter of radar antenna this moment after the radar tracking steady state (SS).(position angle of processing out in this example is 2 degree 24 minutes and 2.1 seconds, and the angle of pitch is 1 degree 51 minutes and 44 seconds)

The state judgement, the parameter of the resulting parameter of optical measurement and radar actual measurement is compared, if the radar measurement error shows that greater than 0.2 degree radar antenna need carry out rezeroing, if measurement error shows that less than 0.2 degree radar antenna is in good condition, if also existing angle to follow the tracks of fault, aircraft guidance system advises carrier aircraft other unit is checked.(this routine angle of cut is 3 minutes 9.9 seconds (approximately 0.05 degree), and the pitching angular difference is 2 minutes 13.6 seconds (approximately 0.04 degree), and all less than 0.2 degree, radar state is normal for error)

Close the target simulator power supply, remove and receive the radiation electromagnetic horn, close radome, test finishes.

Claims

1. airborne radar antenna zero adjustment method is characterized in that comprising the following steps:

The first step, equipment sets up:

Set up one of total powerstation at, 5 meters, dead ahead of carrier aircraft, set up one, radiation loudspeaker at, 10 meters, dead ahead of carrier aircraft, approximately 3 meters of electromagnetic horn height, electromagnetic horn mouth are aimed at the radar antenna center, place a target simulator under electromagnetic horn, connect system cable;

Second step, three-dimensional coordinate measurement:

Utilize total powerstation that four monumented point A, B, C, D of radar antenna installed surface are measured, determine the three-dimensional coordinate of each point;

Utilize total powerstation that four monumented points 1,2,3,4 of radiation loudspeaker are measured, determine the three-dimensional coordinate of each point;

In the 3rd step, data are calculated, and utilize the software of special exploitation to carry out match and calculating:

Having obtained radar antenna installed surface and radiation loudspeaker after totally 8 monumented points, determine radar antenna installed surface ABCD and electromagnetic horn actinal surface 1234 by the software digital simulation, and can calculate central point O1 and the O2 on two planes;

Calculate by software and can simulate ray O1FE geometric expression formula, ray O1FE is the normal perpendicular to plane ABCD, the F point is the geometric center on radar antenna plane, and the three-dimensional coordinate that F is ordered can calculate by the distance parameter that radar antenna installed surface original size O1 point and F are ordered;

By can be calculated the geometric expression formula of ray FO2, ray FO2 is the direction that radar antenna points to the radiation loudspeaker;

By calculating mid point d, a, b, the c of line segment AB, BC, CD, DA, can simulate radar antenna surface level acF face by a, c, 3 of F, can simulate radar antenna vertical plane bdF face by b, d, 3 of F;

Ray FO2 is carried out projection toward radar antenna surface level acF and vertical plane bdF respectively, thereby can obtain azimuth angle alpha angle and angle of pitch β angle that radar antenna points to the radiation electromagnetic horn;

The 4th step, the electrical angle parameter measurement:

Remove the receipts total powerstation, open radar simulator, set corresponding frequency of operation, speed, distance parameter, radar is opened high pressure, and carry out target search, lockon and follow, after entering tenacious tracking, reads by radar position angle, the angle of pitch parameter of radar antenna this moment;

The 5th step, Data Comparison:

To utilize total powerstation to calculate resulting position angle, angle of pitch parameter and radar actual measurement parameter by optical mode and compare, determine whether radar antenna the angle zero shift occurred.

2. airborne radar antenna zero adjustment method according to claim 1 is characterized in that utilizing optical measurement and utilizes target simulator to carry out electric parameter measurement combining and calibrating and fault isolation.

3. airborne radar antenna zero adjustment method according to claim 1, it is characterized in that having carried out whole testing process integrated in Design of System Software, make operating personnel according to the software prompt finishing equipment set up with the monumented point three-dimensional coordinate measurement after, need not to complete the middle process intervention state measurement of whole radar antenna, and provide whether qualified judgement, be convenient to isolated fault.