A 94 GHz pulse Doppler solid-state millimeter-wave cloud radar (MMCR), Tianjian-II (TJ-II), has been developed. It reduces the size and cost using a power amplifier (SSPA) single antenna. This paper describes system design, including hardware signal processing components. Pulse compression, segmented pulse, dual repetition frequency (PRF) technologies are employed to overcome limitations impose...

Coherent ultrasonic Doppler velocimeters provide precise and accurate measurements of velocity profiles in many applications. However, these instruments suffer from the well known range-velocity ambiguity, making this kind of instruments not well suited for velocity measurements in channels of several meters depth and water velocities of some meters per second. On the other side, incoherent ult...

In the civilian aviation field, the radar detection of hazardous weather phenomena (winds) is very important. This detection will allow the avoidance of these phenomena and consequently will enhance the safety of flights. In this work, we have used the wavelets method to estimate the mean velocity of winds. The results showed that the application of this method is promising compared with the cl...

The use of Doppler ultrasound as a means of obtaining cardiac output (CO) measurements quickly, easily, and noninvasively has been made possible by recent technologic developments. We evaluated a new pulse Doppler ultrasonic unit (Velcom-100, Waters Instruments, Inc) in the Surgical Intensive Care Unit at the University of Michigan Medical Center. Accuracy of this device was determined by compa...

In continuous wave ultrasonic Doppler tomography (DT), the ultrasonic beam moves relative to the scanned object to acquire Doppler-shifted frequency spectra which correspond to cross-range projections of the scattering and reflecting structures within the object. The relative motion can be circular or linear. These data are then backprojected to reconstruct the two-dimensional image of the obje...

Arterial disease (peripheral vascular disease) is the result of narrowing of the blood vessel lumen. The classic clinical signs need to be recognized early before progression to arterial predominant disease and limb ischemia. Arterial ulcers or tissue breakdown can result from trauma, infection, or other etiologies with diabetes, smoking, increasing age, and hypertension the most important risk...

A coherent optical processor for displaying a signal's ambiguity function is described. The required time delay is realized by 45 degrees rotations of two identical input transparencies and the Doppler shift by a 1-D Fourier transformation. The entire ambiguity function is displayed in the output (Doppler shift-time delay) plane. Examples of the optically computed ambiguity function for single ...

This paper addresses the problem of optimum waveform design for multiple target detection. The notion of poly-semantic radar, which gave improved performance through coincidence detection, is analyzed for high resolution radar system in presence of high density additive noise and Doppler shift. These sequences are optimized by employing Hamming backtrack algorithm (HBT). The detection capabilit...