© The Institution of Engineering and Technology
A software-based method for estimating and compensating for chirp non-linearity in frequency-modulated continuous wave radars is described. The method is based on the phase-gradient algorithm and time-domain warping of the dechirped signal. The method is demonstrated both on typically and severely non-linear chirps. The retrospective application is demonstrated on archive radar data.
References
-
-
1)
-
W.J. Caputi
.
Stabilized linear FM generator.
IEEE Trans. AES
,
5 ,
670 -
678
-
2)
-
Beasley, P.D.L.: `Coherent frequency modulated continuous wave radar', 2006/103391 A1, 2006, World Patent WO.
-
3)
-
Macfarlane, D.G., Robertson, D.A.: `Long range, high resolution 94 GHz FMCW imaging radar (AVTIS)', Proc. Int. Conf. IRMMW-THz, September 2005, Karlsruhe, Germany, 1, p. 201–202.
-
4)
-
P.H. Eichel ,
C.V. Jakowatz
.
Phase-gradient algorithm as an optimal estimator of the phase derivative.
Opt. Lett.
,
20 ,
1101 -
1103
-
5)
-
Robertson, D.A., Macfarlane, D.G.: `A 94 GHz real aperture 3D imaging radar', Proc. EuRAD, September 2006, Manchester, England, p. 154–157.
-
6)
-
Middleton, R.J.C., Robertson, D.A.: `Predicting range point response from chirp non-linearity', Int. Radar Conf., September 2008, Adelaide, Australia, p. 128–132.
-
7)
-
Musch, T., Rolfes, I., Schiek, B.: `Fractional divider concepts with phase-lock-control for the generation of precise linear frequency ramps', 28thEuropean Microwave Conf., October 1998, 1, p. 451–456.
-
8)
-
Burke, P.J.: `Ultra-linear chirp generation via VCO tuning predistortion', Proc. IEEE MTT-S, May 1994, Munich, Germany, 2, p. 957–960.
-
9)
-
C.V. Jakowatz ,
D.E. Wahl ,
P.H. Eichel ,
D.C. Ghiglia ,
P.A. Thompson
.
(1996)
Spotlight-mode synthetic aperture radar: a signal processing approach.
-
10)
-
D.E. Wahl ,
P.H. Eichel ,
D.C. Ghiqlia ,
C.V. Jakowatz
.
Phase gradient autofocus— a robust tool for high resolution SAR phase correction.
IEEE Trans. Aerosp. Electron. Syst.
,
3 ,
827 -
835
-
11)
-
Fuchs, J., Ward, K.D., Tulin, M.P., York, R.A.: `Simple techniques to correct for VCO nonlinearities in short range FMCW radars', Proc. IEEE MTT-S, June 1996, California, USA, 2, p. 1175–1178.
-
12)
-
G. Wadge ,
D.G. Macfarlane ,
D.A. Robertson
.
AVTIS: a novel millimetre-wave ground-based instrument for volcano remote sensing.
J. Volcanol. Geotherm. Res.
,
4 ,
307 -
318
-
13)
-
Robertson, D.A., Middleton, R.J.C., Macfarlane, D.G.: `A 94 GHz FMCW instrumentation radar', Proc. IRMMW-THz Cardiff, Wales, 2007, p. 919–921.
-
14)
-
Pichler, M., Stelzer, A., Gulden, P., Vossiek, M.: `Influence of systematic frequency-sweep non-linearity on object distance estimation in FMCW/FSCW radar systems', Proc. 33rd European Microwave Conf., October 2003, Munich, Germany, 3, p. 1203–1206.
-
15)
-
Wagner, C., Stelzer, A., Jager, H.: `PLL architecture for 77-GHz FMCW radar systems with highly-linear ultra-wideband frequency sweeps', Proc. IEEE MTT-S, June 2006, San Fransisco, USA, p. 399–402.
-
16)
-
Meta, A., Hoogeboom, P., Ligthart, L.P.: `Range non-linearities correction in FMCW SAR', IEEE IGARRS Int. Conf., 2006, p. 403–406.
-
17)
-
J.R. Klauder ,
A.C. Price ,
S. Darlington ,
W.J. Albersheim
.
The theory and design of chirp radars.
Bell Syst. Techn. J.
,
4 ,
745 -
808
-
18)
-
Stove, A.G.: `Linearizing a swept frequency radar', European, Application 0 501 566 A1, 1993.
-
19)
-
Christmann, M., Vossiek, M., Smith, M., Rodet, G.: `SAW-based delay locked loop concept for VCO linearization in radar sensors', Proc. 33rd European Microwave Conf., October 2003, Munich, Germany, 3, p. 1135–1138.
-
20)
-
S. Scheiblhofer ,
S. Schuster ,
A. Stelzer
.
High-speed FMCW radar frequency synthesizer with DDS based linearization.
IEEE Microw. Wirel. Compon. Lett.
,
5 ,
397 -
399
-
21)
-
Scheiblhofer, S., Schuster, S., Stelzer, A.: `Effects of systematic FMCW radar sweep nonlinearity on bias and variance of target range estimation', Proc. IEEE MTT-S, June 2006, San Fransisco, USA, p. 1418–1421.
-
22)
-
H. Li ,
H-M. Rein ,
T. Suttorp ,
J. Bock
.
Fully integrated SiGe VCOs with powerful output buffer for 77 GHz automotive radar systems and applications around 100 GHz.
IEEE J. Solid-State Circuits
,
10 ,
1650 -
1658
-
23)
-
Vossiek, M., Heide, P., Nalezinski, M., Magori, V.: `Novel FMCW radar system concept with adaptive compensation of phase errors', Proc. 26th European Microwave Conf., September 1996, Prague, Czech Republic, 1, p. 135–139.
-
24)
-
Robertson, D.A., Macfarlane, D.G.: `AVTIS: all-weather volcano topography imaging sensor', Proc. 29th Int. Conf. Infrared and Millimeter Waves, September 2004, Karlsruhe, Germany, p. 813–814.
-
25)
-
L.A. Hoffman ,
K.H. Hurlbut ,
D.E. Kind ,
H.J. Wintroub
.
A 94 GHz radar for space object identification.
IEEE Trans. MTT
,
12 ,
1145 -
1149
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