L-band radar failure analysis and treatment of common

Study:

Abstract L-band radar, the second wind is a relatively new system, a high degree of automation, the new radar. Its basically a new type of detection system the probe data collection, monitoring and integrated automation and improve the quality and high-altitude meteorological data accuracy, but the failure in the operation have occurred. analysis of the process put the ball bearing drive, alarm, azimuth display other common values jump cause of the malfunction, giving full play to the radar performance, extend service life of the radar, in a timely manner to ensure the normal operation of equipment a reference for.

Keywords: L-band radar; failure; reason; troubleshooting

High-altitude high-altitude detection radar is an important means of meteorological observation. L-band upper air sounding system is a national key investment projects, is a new generation of high-altitude weather detection system of an important part. It is the second from the ground L-band radar and high-altitude wind exploration of digital electronics device composed of air, with a high degree of automation, high precision, aging fast, low energy consumption, small size and light weight [1]. Zhengzhou station was put into operation in 2005, the station put into use, will Henan Province, weather forecasting, disaster prevention and mitigation, in particular, is a major severe weather to provide more comprehensive, timely and accurate basic weather data at high altitude. In order to give full play to the radar's performance, extend the life of the radar, is encountered in the actual work of radar Symptom analysis of the fault were enumerated cases and solutions [2-4], for service personnel.

1 put the ball during the orientation and elevation drive warning
(1) Open-driven extension of the cover, observe the direction the drive that the situation in general are 26 warning. This is because the transmitter and the directional drive motor are mounted on the antenna base, the mutual interference between the minor, if the shield is not good the transmitter frequency signal interference azimuth drive motor, making the drive motor encoder position signal affected by the transmitter, azimuth produced a speed alarm, causing the antenna orientation does not turn, drive the extension of the "A warning" red, "A prepared good "light does not shine.

Solution: re-orientation drive motor and the plug wrap, try to drive the motor on the two cable shield be put in to achieve the best possible shielding effect of failure can be ruled out.

(2) Open-driven extension of the cover, observe the elevation of the drive that the situation, such as alarm 22, for the encoder fault; such as alarm 16, typically tight torque; such as alarm 14, typically a short circuit or electrical damage UVW .

Solution: �� Check encoder connection, usually slip-ring caused by dirty or bad plug, remove the brush, the use of the alcohol concentration of more than 95% of slip-ring and brush cleaning. �� Check the drive gear box, such as internal damage, Depot Repair. �� Check the relevant line or replace the motor.

2 alarm by throwing light on the process
Alarm from the main track the following reasons: �� no trace on the return (not with the notch just above the steps). �� code have to fly point pressure, resulting in high gas is not correct, resulting in a short period of continuous alert. �� Distance Plate 11-3 board can also cause problems ranging error by throwing late. �� axis elevation error can lead to a measure of the elevation angle of the radar data and the large deviation of the actual point of view, which can cause high and 471 gas Radar height difference too. �� pressure the moment the ground is not entered correctly, resulting in the same code put the ball pressure, resulting in high gas pressure difference between high and too large (which occurs more easily in the plateau area), resulting in a short period of continuous alert.

Solution: �� a notch to keep up manually; �� point in time modify the fly; �� re-calibration of the 11-3 plate; �� re-calibration of the optical axis; �� put the ball in the correct input before the moment of initial pressure value.

3 shows the azimuth values jump
Module (SDC) and the coarse synchro bad, there could point bounce phenomena, such as synchronous machine or slip-ring is bad, coarse and fine with not normal, showing always varies between 0 ~ 99 ��.

Solution: �� cleaning brush or slip-ring synchronous electrical and mechanical brush. �� the 11-8 panel DIP switch S1 to the ON state of the first call, slowly rotating the antenna to observe the rough reading is a regular position changes, and if reading is not change or no rule changes, indicating that coarse synchronization machine is not good, replace the faulty synchronous machine. �� may be in the coarse and fine with the status of DIP switch S1 will be the first reversal OFF state; if the coarse and fine with a normal, 11-8 board itself, there is a fault (such as shaft module), replace the faulty module.

Links to Free Download Center http://www.hi138.com 4 papers put the ball at times during the change in azimuth direction and sometimes the same
Coarse and fine with the right orientation will cause changes in azimuth indicator appears sometimes, and sometimes the same phenomenon.

Solution: 11-8 with a coarse plate, the S1 DIP switch to the ON state of the first call and check the reading position by rough reading is fine between 10 and 20, not within range, you need to dial through the S2 code switch with the top four again. If the azimuth, elevation angle calibration value will change frequently, synchronous machine may be plywood or synchronous wheel clamping system is not damaged, tighten the screws or replace the synchronous machine synchronous face plywood; 11-7 Plate 2817 store data changes, the replacement of boards or 2817 11-7. In the antenna rotates, azimuth directions wrong, can be 11-8 DIP switch plate with coarse, finding the hand shake antenna, the difference between coarse and fine data there is a change (under normal circumstances should be essentially the same), may be two azimuth of a synchronous machine which is a problem. then need to open the Antenna's "Position synchronization position", check that synchronization has not been fully Shaft pressure in the azimuth rotation axis, after re-working firm.

5 Open a small transmitter with self-excitation signal
Small transmitter failure or failure of pre-high level, will lead to open the small transmitter with self-excitation signal.

Solution: Disconnect the small transmitter power, self-excited signal compared to a small transmitter fault disappears, the replacement of a small transmitter can be; if not eliminate self-excitation signal, for the failure of pre-high level, the replacement of pre-high level that be.

6 Summary
L-band radar in the business use, its maintenance of radar performance cleaning work is to ensure the best and most important good way, in many cases, dust, corrosion, rust and mildew is caused by such failure. Radars each kinds of parts and components after a certain time after the work will be aging, deterioration and loss of function. frequent and detailed the various parts of the inspection of electrical and mechanical maintenance work, failure to prevent and reduce the occurrence of the fault exclusion the initial stage to avoid large or damage of failure to ensure that equipment to work continuously.

7 References
[1] China Meteorological Administration Division monitoring network. L-band (1) altitude weather detection system operational manual [M]. Beijing: China Meteorological Press, 2005.

[2] Dai Liqiong, Huang Yihui, Li-Xin Wu. L-band high-point review of air meteorological data [J]. Modern Agricultural Science and Technology, 2009 (20) :306-307, 318.

[3] Chen Yongshun, Cai stability. L-band radar in front of upper air sounding note [J]. Fujian Meteorology, 2009 (4) :34-35.

[4] Zhao Lu Xia, Wang Li, Zhang Xiaogang. L-band high-altitude weather detection system handling special problems [J]. Meteorology and Environmental Sciences, 2009 (B09): 307.

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