Aerospace and Electronic Systems Magazine December 2017 - 45

Riddolls
speed software radios. Although a typical transmit channel with
a few hundred watts of power is still several times the cost of a
receive channel, transmit elements counts on the order of hundreds
are possible by using modern digital wave form generator chips
and single-transistor pair power amplifier pallets.
Some future experimental work with planar arrays includes
verifying the optimal aspect ratio (i.e., broadside dimension versus
end-fire dimension) for a planar array. Square arrays would allow
for larger azimuthal operating ranges (including 360° operation),
whereas rectangular-shaped arrays would allow one to reduce the
number of elements with a corresponding decrease in the operating
azimuth range. Work also could be performed to prove the operation
of the planar transmit array, when operating at low elevation angle
and over a wide carrier frequency range. A procedure that accounts
for coupling effects was presented here, and some calculations were
performed to illustrate the viability of the approach. In the way of
future work, a small 8 × 8 transmit array demonstration testbed is
currently being built by the author, and results will be reported in
a later publication. Of key interest is the transmit efficiency of the
array over all steer angles and carrier frequencies and whether sufficient transmit illumination can be supplied to targets to maintain
the required probability of detection for small targets of interest.

[2]

[3]

[4]

[5]

[6]

[7]

[8]
[9]

Campbell, L. W., Katz, A. H., and Patton, D. E. Polar Fox II. Experimental phase semi-annual report. Rome Air Development Center,
Rome, NY, Tech. Rep. RADC-TR-72-21, 1972.
Elkins, T. J. A model for high frequency radar auroral clutter. Rome
Air Development Center, Rome, NY, Tech. Rep. RADC-TR-80-122,
1980.
Yool, S. Polar Cap III: Defence Research Board looks at over-thehorizon radar in Canada's Arctic. Canadian Forces Sentinel, Vol. 9,
1973.
Greenwald, R. A., Baker, K. B., Dudeney, J. R., Pinnock, M., Jones,
T. B., Thomas, E. C., et al. DARN/SuperDARN: a global view of the
dynamics of high-latitude convection. Space Science Reviews, Vol.
71, 4 (1994), 761-796.
Riddolls, R. J. A Canadian perspective on over-the-horizon radar.
Defence Research and Development Canada, Ottawa, Canada, Tech.
Rep. TM2006-285, 2006.
Abramovich, Y. I., Frazer, G. J., and Johnson, B. A. Principles of
mode-selective MIMO OTHR. IEEE Transactions on Aerospace and
Electronic Systems, Vol. 49, 3 (2013), 1839-1868.
Abramovich, Y. I., San Antonio, G., Frazer, G. J., and Williams, C. Superdirective mode selective OTHR with time-division MIMO beamforming. In Proceedings of the IEEE Radar Conference, Cincinnati,
OH, 2014.
Evans, J. V. Theory and practice of ionosphere study by Thomson
scatter radar. Proceedings of the IEEE, Vol. 57 (1969), 496-530.
Riddolls, R. J. Detection of aircraft by high frequency sky wave radar under auroral clutter-limited conditions, Defence Research and
Development Canada, Ottawa, Canada, Tech. Rep. TM 2008-336,
2008.

DECEMBER 2017

[11]

[12]

[13]

[14]

[15]

[16]

[17]

REFERENCES
[1]

[10]

[18]

[19]

[20]
[21]

[22]

[23]

[24]
[25]

[26]

[27]

IEEE A&E SYSTEMS MAGAZINE

Ravan, M., Riddolls, R. J., and Adve, R. S. Ionospheric and auroral
clutter models for HF surface wave and over the horizon radar systems. Radio Science, Vol. 47 (2012), RS3010.
Riddolls, R. J. Auroral clutter observations with a three-dimensional
over-the-horizon radar. In Proceedings of the IEEE Radar Conference, Cincinnati, OH, 2014.
Riddolls, R. J. The three-dimensional spatial autocorrelation of ionospherically propagated wave packets in the Arctic region. In Proceedings of the IEEE Radar Conference, Ottawa, Canada, 2013.
Riddolls, R. J. Joint transmit-receive adaptive beamforming experimental results from an auroral-zone Canadian over-the-horizon radar
system. In Proceedings of the IEEE Radar Conference, Kansas City,
MO, 2011, 548-553.
Riddolls, R. J. Hyperspace aperture concept for auroral clutter control
in a Canadian over-the-horizon radar. In Proceedings of the IEEE Radar Conference, Atlanta, GA, 2012.
Nazaryan, A. (18 Apr. 2014) The massive Russian radar site in the
Chernobyl Exclusion Zone, Newsweek. [Online]. Available: http://
www.newsweek.com/hunt-russian-woodpecker-246670.
Bregman, J. D. Design concepts for a sky noise limited low frequency
array. In Proceedings of the Perspectives on Radio Astronomy: Technologies for Large Antenna Arrays, Dwingeloo, The Netherlands,
2000, 23.
Richards, R. Near end fire effects in a large, planar, random array of
monopoles. In Proceedings of the Antenna Applications Symposium,
Monticello, IL, 1991, 77.
Bazin, V., Moline, J. P., Munoz, J., Dorey, P., Sailant, S. Auffray, et al.
A general presentation about the OTH-radar NOSTRADAMUS. In
Proceedings of the IEEE Radar Conference, Verona, NY, 2006.
Abramovich, Y. I., Frazer, G. F., and Johnson, B. A. Transmit and receive antenna array geometries for mode selective HF OTH MIMO
radar. In Proceedings of the 18th European Signal Processing Conference, Aalborg, Denmark, 2010, 1244-1248.
Kraus, J. D. Antennas. New York: McGraw Hill, 1950.
Frazer, G. J., Meehan, D. H., Abramovich, Y. I., and Johnson, B. A.
Mode-selective OTHR: A new cost-effective sensor for maritime
domain awareness. In Proceedings of the IEEE Radar Conference,
Washington DC, 2010.
Abramovich, Y. I., and Frazer, G. J. Bounds on the volume and height
distributions for the MIMO radar ambiguity function. IEEE Signal
Processing Letters, Vol. 15 (2008), 505-508.
Frazer, G. J., Heitmann, A. J., and Abramovich, Y. I. Initial results from
an experimental skew-fire mode-selective over-the-horizon radar. In
Proceedings of the IEEE Radar Conference, Cincinnati, OH, 2014
Van Trees, H. L. Optimum Array Processing. New York: Wiley, 2006.
Riddolls, R. J., Ravan, M., and Adve, R. S. Canadian HF over-the-horizon radar experiments using MIMO techniques to control auroral clutter.
In Proceedings of the IEEE Radar Conference, Washington DC, 2010.
Riddolls, R. J. Comparison of linear and planar arrays for auroral clutter control in an over-the-horizon radar. In Proceedings of the IEEE
Radar Conference, Seattle, WA, 2017.
Beall, J. M., Kim, Y. C., and Powers, E J. Estimation of wavenumber and frequency spectra using fixed probe pairs. Journal of Applied
Physics, Vol. 53, 6 (1982), 3933-3940.

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