Design of an experimental FMCW weather radar

Download
2015
Coşkun, Salih
FMCW Radars are used in many applications including weather surveillance. Transmitting during the entire observation interval makes them efficient in terms of required power. They are also cheap and easy to implement. This study which was conducted as a master's thesis, is a radar system working at X band. In this system, 0.8 Watts continuous electromagnetic wave which is modulated with a frequency ramp of 30 MHz bandwidth is generated and radiated through the transmit antenna. The scattered signal from the targets (buildings, cars, and hydrometeors) is multiplied with the being transmitted one and a beat signal is obtained. As a result of this deramping process, the range information of a target is converted into the frequency domain. Obtained signal data is processed in MATLAB® after passing through an analog to digital converter. The range and velocity information of the targets are obtained by signal processing. Verification of the system is performed in a controlled environment with buildings and cars whose range and velocities are known. The system is finally used to calculate range of clouds and speed of wind while it is raining.

Suggestions

Optimization of vibration characteristics of a radar antenna structure
Baran, İsmet; Özgen, Gökhan Osman; Ciğeroğlu, Ender; Department of Mechanical Engineering (2011)
Radar antenna structures especially array antennas which are integrated onto structures of aerial vehicles are subject to dynamic structural and aerodynamic loads. Due to occurrences of these dynamic loads there will be certain dynamic deformations which affect the antenna’s performance in an adverse manner. The influence of deformations and vibrations are important on array antenna structures, since they cause a change in orientation of elements of the phased array antenna which affects the gain of the ant...
Spectral and statistical analyses of experimental radar clutter data
Kahyaoğlu, Nazlı Deniz; Yılmaz, Ali Özgür; Department of Electrical and Electronics Engineering (2010)
The performance of radar detection and imaging systems strongly depends on the characteristics of radar clutter. In order to improve the radar signal processing algorithms, successful analysis and modeling of radar clutter are required. For a successful model of radar clutter, both the spectral and statistical characteristics of the clutter should be revealed. Within the scope of this study, an experimental radar data acquisition system is established to analyze radar clutter. The hardware and the data proc...
Range resolution improvement of fmcw radars
Kurt, Sinan; Demir, Şimşek; Department of Electrical and Electronics Engineering (2007)
Frequency Modulated Continuous Wave (FMCW) radar has wide application areas in both civil and military use. The range resolution is a critical concept for these FMCW radars as for the other radar types. There are theoretical restrictions in the range resolution. In addition, the non-ideal properties of the modules used in the systems negatively affects the range resolution. The transmitter leakage, non-linear frequency sweep, FM to AM distortion and measurement errors are some of the critical non-ideal prop...
Height Estimation for Ballistic Platforms using Differential Measurements
Vural, Aydin; Sengul, Orhan; Demir, Şimşek; Hizal, Altunkan (2013-10-01)
Use of radio waves is a very common choice for proximity fuzes. The stand-off distance for fuzes varies between a lower and an upper limit depending on the electromagnetic reflectivity of terrain (target). If the reflectivity of the terrain is comparably higher, the return power at the receiver reaches to the threshold level more quickly and the stand-off distance increases. The work presented here introduces an approach to estimate the height of airborne ballistic platforms more precisely compared with the...
Performance Comparison of Target Tracking Algortihms in Underwater Environment
Ege, Emre; Saranlı, Afşar (2008-04-22)
Target tracking is one the most fundamental elements of a radar system. The aim of target tracking is the reliable estimation of a target's true state based on a time history of noisy sensor observations. In real life, the sensor data may include substantial noise. This noise can render the raw sensor data unsuitable to be used directly. Instead, we must filter the noise, preferably in an optimal manner. For land, air and surface marine vehicles, very successful filtering methods are developed. However, bec...
Citation Formats
S. Coşkun, “Design of an experimental FMCW weather radar,” M.S. - Master of Science, Middle East Technical University, 2015.