The powder materials were WA #600 www.selleckchem.com/products/Sorafenib-Tosylate.html (white fused alumina(WA), and grain size of powder #600) and WA #1000. The powder blasting pressure was thing varied as 0.1MPa, 0.15MPa and 0.2MPa.Table 3.Blasting conditions for deburring experiments.The mass flow rate of the powder was 100g/min and the nozzle scanning pitch was 5mm. X- and Y-directional feedrates of the table were maintained at 100mm/sec. The diameter of the nozzle was 8mm, and the distance between the nozzle and specimen was maintained
Range and velocity estimation of moving targets using high range resolution radar is a topic of great interest. To achieve this goal, there are two problems to be considered. The first problem is how to obtain high range resolution.
It is known Inhibitors,Modulators,Libraries that the range resolution is inversely Inhibitors,Modulators,Libraries proportional to the bandwidth of the transmitted signal and directly transmitting Inhibitors,Modulators,Libraries and Inhibitors,Modulators,Libraries receiving the ultra-wideband signal are difficult to be realized. Stepped-frequency pulse train processing is a well-known technique to obtain high range resolution without the requirement Inhibitors,Modulators,Libraries of wide instantaneous bandwidth [1-7], and Inhibitors,Modulators,Libraries it is adopted in this paper. The second problem is how to correctly measure the range and velocity of the moving target. When the target of interest is stationary, its position can be estimated by inverse discrete Fourier transform (IDFT) on the stepped-frequency pulse train [4-6]. However, when the target is moving, it is necessary to deal with the following difficulties.
Firstly, the radial velocity of the target may cause Inhibitors,Modulators,Libraries range estimate shifted, which is called range-Doppler coupling [4-6], and both range position and radial velocity can not be correctly retrieved in Inhibitors,Modulators,Libraries the IDFT results.
Secondly, for high speed target such as airplane or missile, the IDFT results only provide the remainders of the estimate of coupled range and velocity due to the 2�� modulo folding of the Brefeldin_A IDFT, which is called phase wrapping. Thirdly, the remainders may be erroneous due to the possible interference, Cilengitide e.g., noise or clutter. Several effective methods have been proposed to resolve the range-Doppler coupling, such as by randomized stepped frequency modulation [6] or by elaborated design of the interpulse frequency coding [4-5].
However, how to robustly resolve the phase wrapping problem is not considered in these methods.In this paper, we propose a new algorithm to robustly resolve both of the range-Doppler coupling and the phase wrapping.
The radar transmits and receives multiple stepped-frequency 1|]# pulse trains with different carrier frequencies, and IDFT is operated on every pulse train. It will be shown that, using the difference information among multiple IDFT results and the robust phase unwrapping theorem (RPUT) [8-9], both range and radial velocity of the moving target can be correctly estimated.This paper is organized as follows.