Study On Parts Of Performance Improvement Of Solid-state Weather Radar

Solid-state transmitter was used in solid-state weather radar, so compared with thevacuum tube radar, the solid-state weather radar has some advantages, such as no timeto warm up, removed high voltage devices from the hardware side, more secure duringuse and more stable and reliable performance, longer life, lower noise, smallervolumes, lighter weight, and so on. It is because of these advantages, solid-stateweather radar is always used in vehicle borne radar and airborne radar, even satelliteborne radar.For the peak power of solid-state transmitter is very low, in order to increase thepeak-average power to gain greater detection range, it is necessary to send a pulsewhich has a larger pulse width. According to radar resolution theory, adding the pulsewidth will lead to decrease the resolution in range, at the same time, the blind zone isextended. For the send wave which using a single frequency, there is a pair ofcontradictory between enhancing the detection range by enlarge the pulse width andgaining high resolution in range. The contradiction can be resolved by using pulsecompression technology. To avoid the weather information at close detection blindrange, some relatively narrow pulses will be used to detect the close blind range thatcaused by sending wide pulse. When the observation performance of solid-stateweather radar is optimized, it must be synthetically considered among the detectiondistance, resolution range, blind zone handling practices and the detectability ofdetecting weak weather targets, and other Performance Indicators. That is on the baseof the basic parameters of the solid-state weather radar, we should do a study on theselection of the transmitted waveform, the different classes of pulse and the pulsewidth, the combined manner of width pulse and narrow pulse, the accumulated number,the optimization design or selection of pulse compression network, and make areasonable selection about these parameters. So, from that point, we have done someresearch work on solid-state weather radar in order to improve some of the radarperformance, as follows. (1) Firstly, in the first chapter, this paper briefly introduces the development history ofweather radar, and gives some advantages the solid-state weather has over theconventional weather radar. Besides, there are some aspects we should consider whenimprove the performance of radar.(2) Secondly, in the second chapter, this paper introduces signal basic form ofsolid-state weather, give I、Q signal expression, and the generation process from I、Qsignal to basic data.(3) Thirdly, in the third chapter, first of all, this paper introduces the system ofexperimental solid-state radar. Secondly, it carries out some optimizing scheme designsabout improving the performance of solid-state weather radar. At last, this paper give akind of optimized combined pulse transmit mode and volume scanning strategies.(4) Finally, in the fourth chapter, we do some field experiments to examine theoptimized scheme which was designed to improve parts of solid-state weatherperformance. With discussing and comparing the experimental result, we obtain someuseful results.