Design of an FM-CW radar altimeter

Download

index.pdf

Date

2005

Author

Yetkil, Yaşar Barış

Metadata

Show full item record

Item Usage Stats

1196
views

237
downloads

Frequency modulated continuous wave (FM-CW) radar altimeters are used in civil and military applications. Proximity fuses, automatic cruise control systems of cars, radar altimeter of planes are examples to these applications. The goal of this thesis is to present a method for altitude determination using an FM-CW radar. For this purpose principles of radars and FM-CW systems are studied and related subjects are inspected. After this inspection, algorithms for altitude determination are evaluated. Consequently signal detection and processing methods are proposed to build an altitude determining algorithm. Also an analytical test environment for altitudes between 100 m and 4000 m is developed in computer as a result of researches. Test environment simulated the performance of altitude determining algorithm and FM-CW Radar Altimeter. The hardware is designed and implemented accordingly.

Subject Keywords

Telecommunication.

URI

http://etd.lib.metu.edu.tr/upload/12606819/index.pdf
https://hdl.handle.net/11511/15702

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Waveform design for pulse doppler radar Ağırman, Handan; Severcan, Mete; Department of Electrical and Electronics Engineering (2005) This study is committed to the investigation of optimum waveforms for a pulse doppler radar which uses a non linear high power amplifier in the transmitter. The optimum waveform is defined as the waveform with the lowest peak and integrated side lobe level, the narrowest main lobe in its autocorrelation and the narrowest bandwidth in its spectrum. The Pulse Compression method is used in radar systems since it is more advantageous in terms of the resolution. Among all pulse compression methods, the main focu...
Target detection by the ambiguity function technique and the conventional fourier transform technique in frequency coded continuous wave radars Akangöl, Mehmet; Sayan, Gönül; Department of Electrical and Electronics Engineering (2005) Continuous Wave (CW) radars are preferred for their low probability of intercept by the other receivers. Frequency modulation techniques, the linear frequency modulation (LFM) technique in particular, are commonly used in CW radars to resolve the range and the radial velocity of the detected targets. The conventional method for target detection in a linear FMCW radar makes use of a mixer followed by a low-pass filter whose output is Fourier transformed to get the range and velocity information. In this thes...
Optimization of doppler processing by using bank of matched filters Aktop, Onur; Tanık, Yalçın; Department of Electrical and Electronics Engineering (2005) In radars, matched filters are used in the receiver of the system. Since the target velocity is not known a priori, degradation occurs due to mismatch of the return signal and the matched filter. The performance of the radar can be improved by using a bank of matched filters. The first topic investigated in this work is optimization of the bank of matched filter structure. Two methods are proposed for the design of the parallel filter structure and computations are performed with both methods. The output si...
Interception techniques for direct sequence spread spectrum signals Karadeniz, Uygar; Baykal, Buyurman; Department of Electrical and Electronics Engineering (2005) In this work interception and spreading sequence estimation of Direct Sequence Spread Spectrum (DSSS) signals, in low signal to noise power ratios is discussed. For interception an approach based on autocorrelation fluctuations is employed and also symbol period is estimated from this interception process. Spreading sequence estimation is performed by using eigenanalysis of the correlation matrix and estimated symbol period. These approaches are applied on different kinds of DSSS signals including 3rd gener...
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...

Citation Formats

Y. B. Yetkil, “Design of an FM-CW radar altimeter,” M.S. - Master of Science, Middle East Technical University, 2005.