Navy

Direct wideband direction finding of microwave signals

Novel preprocessing technique in a linear array design enables small baseline direction finding while achieving a wide field of view and fine angular resolution

Communications

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Block diagram of a two-element photonic direction finding linear array.

In recent years, there has been increasing interest in microwave direction-of-arrival (MW-DOA) estimation due to wide applications in the military and commercial areas, such as electronic warfare, wireless communications, and wireless localization. DOA information can be used to minimize the signal power of the interference while maximizing the power of the desired signal, improving the performance of the system.

Use of photonic devices in MW-DOA circuits has become more prevalent due to their wide bandwidths (BWs), the low-attenuation losses associated with fiber-optic cables, immunity to electromagnetic interference, and the ability to implement true time delay lines. The revolution in MW photonics has rendered new techniques for generating MW signals, photonic signal processing including MW delay line filters for beamforming applications, and photonic analog-to-digital converters. But, wideband optical technology may have it’s greatest near-term impact in direction finding (DF) and digital receiver architectures.

Pushing the utility of optical technology in DOA estimation, Navy researchers have developed a preprocessing technique – robust symmetrical number system (RSNS) – to yield a high spatial resolution, wide frequency bandwidth, wide field of view, with a minimum number array elements, and a short array baseline length. These benefits are derived from a multi-element wideband DF array (for optical down conversion) with RSNS preprocessing combined with a dual-electrode Mach-Zehnder modulator.

Prenegotiated License Terms

Non-Exclusive
Partially Exclusive
Exclusive
License Execution Fee
$2,000
$3,000
$4,000
Royalty on Net Sales
2%
3%
4%
Minimum Annual Royalty
$1,000
$1,500
$2,500
Annual Patent Fee
$1,000
$1,500
$1,500
Sublicensing
No
Yes
Yes
Sublicensing Royalty on Net Sales
N/A
3%
4%
Sublicensing Royalty on Other Income
N/A
50%
50%

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