Location History:
- Washington, DC (US) (1976 - 1979)
- La Crescenta, CA (US) (1990)
- Pasadena, CA (US) (1996)
Company Filing History:
1 out of 139 
1 out of 51,901 
1 out of 703 Years Active: 1976-1996
Title: Anthony L Freeman: Innovator in Airborne Synthetic Aperture Radar Systems
Introduction
Anthony L Freeman is a distinguished inventor based in Washington, DC, known for his contributions to airborne synthetic aperture radar (SAR) systems. With a total of 4 patents, Freeman has made significant advancements in the field of radar technology, particularly in determining terrain topography.
Latest Patents
Freeman's latest patents include an innovative airborne SAR system designed for determining the topography of a terrain. This system utilizes two complete, correlated SAR images with different amplitude modulation in the cross-track direction. The images are obtained by switching between two antenna patterns generated by a monopulse antenna. The desired terrain information is extracted from the amplitude relationship of the two SAR images, and it is also possible to derive terrain information from polarimetric SAR data via crosstalk parameters.
Another notable patent involves a synthetic aperture radar system that addresses the azimuthal positioning errors in radar imagery. In this invention, information regarding the radar reflectivity of a point on the ground is accurately placed in an image at an azimuthal position corresponding to the zero Doppler frequency shift of the received signal. By using the slope of the frequency modulation of the received signal, calculated through an autofocus procedure, Freeman's invention allows for the production of imagery free from azimuthal positioning errors.
Career Highlights
Throughout his career, Freeman has worked with reputable organizations, including Deutsche Forschungsanstalt für Luft- und Raumfahrt e.V. His work has significantly impacted the field of radar technology, leading to advancements that enhance the accuracy and reliability of terrain mapping.
Collaborations
Freeman has collaborated with notable professionals in his field, including Manfred Zink and Herwig Ttl. These collaborations have contributed to the development of innovative radar technologies and have furthered research in airborne systems.
Conclusion
Anthony L Freeman's contributions to airborne synthetic aperture radar systems demonstrate his expertise and commitment to innovation in radar technology. His patents reflect a deep understanding of the complexities involved in terrain mapping and radar signal processing.