Design of acoustic emission system of wind profile radar RASS Issue 5 Tan Jianbo et al.: Design of acoustic emission system of wind profile radar RASS 5 9 Meeting the BRAG condition, that is, achieving BRAG matching, is not only the goal pursued by various existing RASS, but also the basis for their temperature measurement. The echo power spectrum obtained by different acoustic carrier frequencies and different acoustic modulation signals may be very different. For the measured altitude layer, P is unknown, but the pulse length (number of acoustic wave wavelengths) can be predicted but not predicted, radar antenna gain G = 31dB, RASS acoustic antenna gain G = 20dB, radar transmitter peak power P = 20kW = 43dB, acoustic wave peak power P = 10W = 10dB, radar beam width = 4.5. , the acoustic wave attenuation coefficient L≈ 10dB/km when the detection distance R is 800~1200Hz. Substituting into the above formula, we get P(dB)=42.3+62+43+20+10-60.3-201gR-158.6-10R-41.8-201gR-accurate control. For this reason, it is necessary to set an audio frequency window. Not only does it make all the measured altitude layers have the opportunity to meet the Bragg condition, but it also avoids the great waste of acoustic power and time. There are various modulation signals to choose from, such as single carrier continuous wave (CW), single carrier short pulse (PW...
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