Skip to main content

John D. Sahr

  • Professor
  • Associate Chair for Education and Entrepreneurship

Appointments

Professor, Electrical Engineering
Adjunct Professor, Earth and Space Sciences
Adjunct Professor, Aeronautics and Astronautics

Biography

John Sahr is a professor of electrical engineering, adjunct in Earth and space sciences as well as aeronautics and astronautics.  His research in radar remote sensing of ionospheric turbulence involves the design, construction and operation of innovative passive radar systems, in particular the Manastash Ridge Radar.  Furthermore, Sahr and his students have developed novel Direct Sampling radar receivers which have almost no analog components, and employ high speed sampling and digital signal processing to achieve enormous linearity and dynamic range. Sahr and colleagues have recently filed provisional patents building upon the passive radar receivers in preparation for a startup that has won funding from both the UW CoMotion Innovation Fund and the Washington Research Foundation.

Research Interests

Ionospheric physics; electrojet turbulence; passive bistatic radar; radar remote sensing; radar waveform design; radar interferometry; and statistical signal processing.

3uweeViewNews Object
(
    [_showAnnouncements:protected] => 
    [_showTitle:protected] => 
    [showMore] => 
    [_type:protected] => spotlight
    [_from:protected] => person
    [_args:protected] => Array
        (
            [post_type] => spotlight
            [date_query] => Array
                (
                    [0] => Array
                        (
                            [after] => Array
                                (
                                    [year] => 2016
                                    [month] => 2
                                    [day] => 20
                                )

                        )

                )

            [meta_query] => Array
                (
                    [relation] => AND
                    [0] => Array
                        (
                            [key] => type
                            [value] => news
                            [compare] => LIKE
                        )

                    [1] => Array
                        (
                            [key] => subjects
                            [value] => "897"
                            [compare] => LIKE
                        )

                )

            [posts_per_page] => 6
            [post_status] => publish
        )

    [_jids:protected] => 
    [_taxa:protected] => Array
        (
        )

    [_meta:protected] => Array
        (
            [0] => Array
                (
                    [key] => type
                    [value] => news
                    [compare] => LIKE
                )

            [1] => Array
                (
                    [key] => subjects
                    [value] => "897"
                    [compare] => LIKE
                )

        )

    [_metarelation:protected] => AND
    [_results:protected] => Array
        (
            [0] => WP_Post Object
                (
                    [ID] => 10656
                    [post_author] => 12
                    [post_date] => 2017-05-17 15:59:36
                    [post_date_gmt] => 2017-05-17 22:59:36
                    [post_content] => [caption id="attachment_1278" align="alignleft" width="168"] Professor John Sahr[/caption]

OneRadio, founded by Professor John Sahr and Affiliate Professor Tony Goodson, demonstrated its wideband radio receiver platform at last week's IEEE Radar Conference in Seattle.

The startup was developed by Sahr and Goodson to create a single radio that is capable of performing multiple functions simultaneously. The technology combines hardware advances with software applications to allow users to perform many functions at once via software applications.

The OneRadio utilizes a patent-pending, digitally based method to pick up signals across a wide stretch of frequencies and a wide range of signal strength.

“We have the capability of seeing extremely weak signals in the presence of strong signals,”OneRadio CEO Mohan Vaghul said in a recent article.

OneRadio is designed to do what high-end wideband receivers cannot do and at a tenth of the price. Although high-end receivers can identify weak signals, OneRadio can access signals across a wider bandwidth.

“The long-term potential is pretty phenomenal,” Vaghul said in the article.

For aerospace and defense purposes, one receiver could be used in place of several narrower-band receivers. The OneRadio system could monitor for malicious activities in the telecom and security fields. At last week’s conference, OneRadio conducted live demonstrations of wideband RF operations.

The first-generation platform spans 2.5 GHz of bandwidth. However, the company is making strides in the development of a 7 GHz bandwidth.

The development of this product comes from years of research at the University of Washington Department of Electrical Engineering. Support for OneRadio originated from the UW's CoMotion Innovation Fund. CoMotion is dedicated to expanding the economic and societal reach of the UW community by helping innovators achieve the greatest impact from their discoveries.

“CoMotion is pleased to have worked with this team over the past two years to help commercialize this complex technology by working with them on licensing, patent filings, marketing and business development,” said Vikram Jandhyala, executive director of CoMotion and UW’s vice president for innovation strategy, in the article.

---

Information for this release was adapted from a recent article in GeekWire.

[post_title] => Startup OneRadio unveils radio receiver platform [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => startup-oneradio-unveils-radio-receiver-platform [to_ping] => [pinged] => [post_modified] => 2017-10-19 14:06:37 [post_modified_gmt] => 2017-10-19 21:06:37 [post_content_filtered] => [post_parent] => 0 [guid] => http://www.ee.washington.edu/?post_type=spotlight&p=10656 [menu_order] => 60 [post_type] => spotlight [post_mime_type] => [comment_count] => 0 [filter] => raw ) [1] => WP_Post Object ( [ID] => 10125 [post_author] => 12 [post_date] => 2017-03-08 15:37:25 [post_date_gmt] => 2017-03-08 23:37:25 [post_content] => [caption id="attachment_10126" align="alignleft" width="214"]sahr_john-68 Professor John Sahr[/caption] The University Space Research Association (USRA) is a consortium of nation-wide university and in-house talent. These cross-disciplinary innovators work together to advance space science and technology. Electrical Engineering Professor John Sahr was appointed as the University of Washington (UW) representative; he will begin on April 1. UW Provost Gerald Baldasty recommended Sahr as the new appointee due to Sahr’s long-term expertise in space sciences and engineering and knowledge of the UW’s role in these areas. In addition to his professorship in electrical engineering, Sahr also has adjunct appointments in earth and space sciences and aeronautics and astronautics. Sahr’s research primarily focuses on VHF radar remote sensing of the Earth's upper atmosphere. Throughout his time at the UW, Sahr has led many committees and groups and received several top awards, including the NSF’s National Young Investigator Award and the Henry Booker Fellowship. [post_title] => Professor John Sahr Appointed USRA Representative [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => professor-john-sahr-appointed-usra-representative [to_ping] => [pinged] => [post_modified] => 2017-03-08 15:38:45 [post_modified_gmt] => 2017-03-08 23:38:45 [post_content_filtered] => [post_parent] => 0 [guid] => http://www.ee.washington.edu/?post_type=spotlight&p=10125 [menu_order] => 84 [post_type] => spotlight [post_mime_type] => [comment_count] => 0 [filter] => raw ) [2] => WP_Post Object ( [ID] => 761 [post_author] => 15 [post_date] => 2016-03-10 20:37:43 [post_date_gmt] => 2016-03-10 20:37:43 [post_content] => STARSProgram Professors John Sahr and Linda Bushnell were the stars of the show at a recent information session for students in January 2016. The information session was specifically for students enrolled in the Washington STate Academic RedShirt (STARS) in Engineering Program, which supports incoming freshmen who are interested in pursuing an engineering degree and who are from economically and educationally underserved backgrounds. At the information session, Sahr and Bushnell spoke about their experiences working, teaching and conducting research in electrical engineering. Five electrical engineering students also shared their experiences, from academics to research to internships. With engineering programs having among the most challenging curricula, STARS is designed to help students build the necessary skills and support systems to successfully navigate the challenges they encounter while completing an engineering degree. During their first two years of college, participants receive a specialized curriculum designed to prepare them to pursue an engineering major. As part of the program, they are guaranteed acceptance into one of the UW’s 10 engineering programs. Last year, STARS students had a cumulative GPA that was, on average, 0.33 higher than their non-STARS peers. The STARS program, which was founded in 2013, is an initiative led by EE Professor Eve Riskin, Associate Dean of Diversity and Access. A National Science Foundation grant was secured to start the program. [post_title] => EE Professors Share Experiences with STARS Students [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => ee-professors-share-experiences-with-stars-students [to_ping] => [pinged] => [post_modified] => 2016-04-22 22:16:52 [post_modified_gmt] => 2016-04-22 22:16:52 [post_content_filtered] => [post_parent] => 0 [guid] => http://hedy.ee.washington.edu/?post_type=spotlight&p=761 [menu_order] => 942 [post_type] => spotlight [post_mime_type] => [comment_count] => 0 [filter] => raw ) ) [_numposts:protected] => 6 [_rendered:protected] => 1 [_classes:protected] => Array ( [0] => block--spotlight-tiles ) [_finalHTML:protected] => [_postID:protected] => 897 [_errors:protected] => Array ( ) [_block:protected] => [_db:protected] => WP_Query Object ( [query] => Array ( [post_type] => spotlight [date_query] => Array ( [0] => Array ( [after] => Array ( [year] => 2016 [month] => 2 [day] => 20 ) ) ) [meta_query] => Array ( [relation] => AND [0] => Array ( [key] => type [value] => news [compare] => LIKE ) [1] => Array ( [key] => subjects [value] => "897" [compare] => LIKE ) ) [posts_per_page] => 6 [post_status] => publish ) [query_vars] => Array ( [post_type] => spotlight [date_query] => Array ( [0] => Array ( [after] => Array ( [year] => 2016 [month] => 2 [day] => 20 ) ) ) [meta_query] => Array ( [relation] => AND [0] => Array ( [key] => type [value] => news [compare] => LIKE ) [1] => Array ( [key] => subjects [value] => "897" [compare] => LIKE ) ) [posts_per_page] => 6 [post_status] => publish [error] => [m] => [p] => 0 [post_parent] => [subpost] => [subpost_id] => [attachment] => [attachment_id] => 0 [name] => [static] => [pagename] => [page_id] => 0 [second] => [minute] => [hour] => [day] => 0 [monthnum] => 0 [year] => 0 [w] => 0 [category_name] => [tag] => [cat] => [tag_id] => [author] => [author_name] => [feed] => [tb] => [paged] => 0 [meta_key] => [meta_value] => [preview] => [s] => [sentence] => [title] => [fields] => [menu_order] => [embed] => [category__in] => Array ( ) [category__not_in] => Array ( ) [category__and] => Array ( ) [post__in] => Array ( ) [post__not_in] => Array ( ) [post_name__in] => Array ( ) [tag__in] => Array ( ) [tag__not_in] => Array ( ) [tag__and] => Array ( ) [tag_slug__in] => Array ( ) [tag_slug__and] => Array ( ) [post_parent__in] => Array ( ) [post_parent__not_in] => Array ( ) [author__in] => Array ( ) [author__not_in] => Array ( ) [orderby] => menu_order [order] => ASC [ignore_sticky_posts] => [suppress_filters] => [cache_results] => 1 [update_post_term_cache] => 1 [lazy_load_term_meta] => 1 [update_post_meta_cache] => 1 [nopaging] => [comments_per_page] => 50 [no_found_rows] => ) [tax_query] => WP_Tax_Query Object ( [queries] => Array ( ) [relation] => AND [table_aliases:protected] => Array ( ) [queried_terms] => Array ( ) [primary_table] => wp_posts [primary_id_column] => ID ) [meta_query] => WP_Meta_Query Object ( [queries] => Array ( [0] => Array ( [key] => type [value] => news [compare] => LIKE ) [1] => Array ( [key] => subjects [value] => "897" [compare] => LIKE ) [relation] => AND ) [relation] => AND [meta_table] => wp_postmeta [meta_id_column] => post_id [primary_table] => wp_posts [primary_id_column] => ID [table_aliases:protected] => Array ( [0] => wp_postmeta [1] => mt1 ) [clauses:protected] => Array ( [wp_postmeta] => Array ( [key] => type [value] => news [compare] => LIKE [alias] => wp_postmeta [cast] => CHAR ) [mt1] => Array ( [key] => subjects [value] => "897" [compare] => LIKE [alias] => mt1 [cast] => CHAR ) ) [has_or_relation:protected] => ) [date_query] => WP_Date_Query Object ( [queries] => Array ( [0] => Array ( [after] => Array ( [year] => 2016 [month] => 2 [day] => 20 ) [column] => post_date [compare] => = [relation] => AND ) [column] => post_date [compare] => = [relation] => AND ) [relation] => AND [column] => wp_posts.post_date [compare] => = [time_keys] => Array ( [0] => after [1] => before [2] => year [3] => month [4] => monthnum [5] => week [6] => w [7] => dayofyear [8] => day [9] => dayofweek [10] => dayofweek_iso [11] => hour [12] => minute [13] => second ) ) [request] => SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id ) INNER JOIN wp_postmeta AS mt1 ON ( wp_posts.ID = mt1.post_id ) WHERE 1=1 AND ( wp_posts.post_date > '2016-02-20 23:59:59' ) AND ( ( wp_postmeta.meta_key = 'type' AND wp_postmeta.meta_value LIKE '%news%' ) AND ( mt1.meta_key = 'subjects' AND mt1.meta_value LIKE '%\"897\"%' ) ) AND wp_posts.post_type = 'spotlight' AND ((wp_posts.post_status = 'publish')) GROUP BY wp_posts.ID ORDER BY wp_posts.menu_order ASC LIMIT 0, 6 [posts] => Array ( [0] => WP_Post Object ( [ID] => 10656 [post_author] => 12 [post_date] => 2017-05-17 15:59:36 [post_date_gmt] => 2017-05-17 22:59:36 [post_content] => [caption id="attachment_1278" align="alignleft" width="168"] Professor John Sahr[/caption] OneRadio, founded by Professor John Sahr and Affiliate Professor Tony Goodson, demonstrated its wideband radio receiver platform at last week's IEEE Radar Conference in Seattle. The startup was developed by Sahr and Goodson to create a single radio that is capable of performing multiple functions simultaneously. The technology combines hardware advances with software applications to allow users to perform many functions at once via software applications. The OneRadio utilizes a patent-pending, digitally based method to pick up signals across a wide stretch of frequencies and a wide range of signal strength. “We have the capability of seeing extremely weak signals in the presence of strong signals,”OneRadio CEO Mohan Vaghul said in a recent article. OneRadio is designed to do what high-end wideband receivers cannot do and at a tenth of the price. Although high-end receivers can identify weak signals, OneRadio can access signals across a wider bandwidth. “The long-term potential is pretty phenomenal,” Vaghul said in the article. For aerospace and defense purposes, one receiver could be used in place of several narrower-band receivers. The OneRadio system could monitor for malicious activities in the telecom and security fields. At last week’s conference, OneRadio conducted live demonstrations of wideband RF operations. The first-generation platform spans 2.5 GHz of bandwidth. However, the company is making strides in the development of a 7 GHz bandwidth. The development of this product comes from years of research at the University of Washington Department of Electrical Engineering. Support for OneRadio originated from the UW's CoMotion Innovation Fund. CoMotion is dedicated to expanding the economic and societal reach of the UW community by helping innovators achieve the greatest impact from their discoveries. “CoMotion is pleased to have worked with this team over the past two years to help commercialize this complex technology by working with them on licensing, patent filings, marketing and business development,” said Vikram Jandhyala, executive director of CoMotion and UW’s vice president for innovation strategy, in the article.

---

Information for this release was adapted from a recent article in GeekWire.

[post_title] => Startup OneRadio unveils radio receiver platform [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => startup-oneradio-unveils-radio-receiver-platform [to_ping] => [pinged] => [post_modified] => 2017-10-19 14:06:37 [post_modified_gmt] => 2017-10-19 21:06:37 [post_content_filtered] => [post_parent] => 0 [guid] => http://www.ee.washington.edu/?post_type=spotlight&p=10656 [menu_order] => 60 [post_type] => spotlight [post_mime_type] => [comment_count] => 0 [filter] => raw ) [1] => WP_Post Object ( [ID] => 10125 [post_author] => 12 [post_date] => 2017-03-08 15:37:25 [post_date_gmt] => 2017-03-08 23:37:25 [post_content] => [caption id="attachment_10126" align="alignleft" width="214"]sahr_john-68 Professor John Sahr[/caption] The University Space Research Association (USRA) is a consortium of nation-wide university and in-house talent. These cross-disciplinary innovators work together to advance space science and technology. Electrical Engineering Professor John Sahr was appointed as the University of Washington (UW) representative; he will begin on April 1. UW Provost Gerald Baldasty recommended Sahr as the new appointee due to Sahr’s long-term expertise in space sciences and engineering and knowledge of the UW’s role in these areas. In addition to his professorship in electrical engineering, Sahr also has adjunct appointments in earth and space sciences and aeronautics and astronautics. Sahr’s research primarily focuses on VHF radar remote sensing of the Earth's upper atmosphere. Throughout his time at the UW, Sahr has led many committees and groups and received several top awards, including the NSF’s National Young Investigator Award and the Henry Booker Fellowship. [post_title] => Professor John Sahr Appointed USRA Representative [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => professor-john-sahr-appointed-usra-representative [to_ping] => [pinged] => [post_modified] => 2017-03-08 15:38:45 [post_modified_gmt] => 2017-03-08 23:38:45 [post_content_filtered] => [post_parent] => 0 [guid] => http://www.ee.washington.edu/?post_type=spotlight&p=10125 [menu_order] => 84 [post_type] => spotlight [post_mime_type] => [comment_count] => 0 [filter] => raw ) [2] => WP_Post Object ( [ID] => 761 [post_author] => 15 [post_date] => 2016-03-10 20:37:43 [post_date_gmt] => 2016-03-10 20:37:43 [post_content] => STARSProgram Professors John Sahr and Linda Bushnell were the stars of the show at a recent information session for students in January 2016. The information session was specifically for students enrolled in the Washington STate Academic RedShirt (STARS) in Engineering Program, which supports incoming freshmen who are interested in pursuing an engineering degree and who are from economically and educationally underserved backgrounds. At the information session, Sahr and Bushnell spoke about their experiences working, teaching and conducting research in electrical engineering. Five electrical engineering students also shared their experiences, from academics to research to internships. With engineering programs having among the most challenging curricula, STARS is designed to help students build the necessary skills and support systems to successfully navigate the challenges they encounter while completing an engineering degree. During their first two years of college, participants receive a specialized curriculum designed to prepare them to pursue an engineering major. As part of the program, they are guaranteed acceptance into one of the UW’s 10 engineering programs. Last year, STARS students had a cumulative GPA that was, on average, 0.33 higher than their non-STARS peers. The STARS program, which was founded in 2013, is an initiative led by EE Professor Eve Riskin, Associate Dean of Diversity and Access. A National Science Foundation grant was secured to start the program. [post_title] => EE Professors Share Experiences with STARS Students [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => ee-professors-share-experiences-with-stars-students [to_ping] => [pinged] => [post_modified] => 2016-04-22 22:16:52 [post_modified_gmt] => 2016-04-22 22:16:52 [post_content_filtered] => [post_parent] => 0 [guid] => http://hedy.ee.washington.edu/?post_type=spotlight&p=761 [menu_order] => 942 [post_type] => spotlight [post_mime_type] => [comment_count] => 0 [filter] => raw ) ) [post_count] => 3 [current_post] => -1 [in_the_loop] => [post] => WP_Post Object ( [ID] => 10656 [post_author] => 12 [post_date] => 2017-05-17 15:59:36 [post_date_gmt] => 2017-05-17 22:59:36 [post_content] => [caption id="attachment_1278" align="alignleft" width="168"] Professor John Sahr[/caption] OneRadio, founded by Professor John Sahr and Affiliate Professor Tony Goodson, demonstrated its wideband radio receiver platform at last week's IEEE Radar Conference in Seattle. The startup was developed by Sahr and Goodson to create a single radio that is capable of performing multiple functions simultaneously. The technology combines hardware advances with software applications to allow users to perform many functions at once via software applications. The OneRadio utilizes a patent-pending, digitally based method to pick up signals across a wide stretch of frequencies and a wide range of signal strength. “We have the capability of seeing extremely weak signals in the presence of strong signals,”OneRadio CEO Mohan Vaghul said in a recent article. OneRadio is designed to do what high-end wideband receivers cannot do and at a tenth of the price. Although high-end receivers can identify weak signals, OneRadio can access signals across a wider bandwidth. “The long-term potential is pretty phenomenal,” Vaghul said in the article. For aerospace and defense purposes, one receiver could be used in place of several narrower-band receivers. The OneRadio system could monitor for malicious activities in the telecom and security fields. At last week’s conference, OneRadio conducted live demonstrations of wideband RF operations. The first-generation platform spans 2.5 GHz of bandwidth. However, the company is making strides in the development of a 7 GHz bandwidth. The development of this product comes from years of research at the University of Washington Department of Electrical Engineering. Support for OneRadio originated from the UW's CoMotion Innovation Fund. CoMotion is dedicated to expanding the economic and societal reach of the UW community by helping innovators achieve the greatest impact from their discoveries. “CoMotion is pleased to have worked with this team over the past two years to help commercialize this complex technology by working with them on licensing, patent filings, marketing and business development,” said Vikram Jandhyala, executive director of CoMotion and UW’s vice president for innovation strategy, in the article.

---

Information for this release was adapted from a recent article in GeekWire.

[post_title] => Startup OneRadio unveils radio receiver platform [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => startup-oneradio-unveils-radio-receiver-platform [to_ping] => [pinged] => [post_modified] => 2017-10-19 14:06:37 [post_modified_gmt] => 2017-10-19 21:06:37 [post_content_filtered] => [post_parent] => 0 [guid] => http://www.ee.washington.edu/?post_type=spotlight&p=10656 [menu_order] => 60 [post_type] => spotlight [post_mime_type] => [comment_count] => 0 [filter] => raw ) [comment_count] => 0 [current_comment] => -1 [found_posts] => 3 [max_num_pages] => 1 [max_num_comment_pages] => 0 [is_single] => [is_preview] => [is_page] => [is_archive] => 1 [is_date] => [is_year] => [is_month] => [is_day] => [is_time] => [is_author] => [is_category] => [is_tag] => [is_tax] => [is_search] => [is_feed] => [is_comment_feed] => [is_trackback] => [is_home] => [is_404] => [is_embed] => [is_paged] => [is_admin] => [is_attachment] => [is_singular] => [is_robots] => [is_posts_page] => [is_post_type_archive] => 1 [query_vars_hash:WP_Query:private] => 0de11d36cdbdc75683129687f0545fda [query_vars_changed:WP_Query:private] => 1 [thumbnails_cached] => [stopwords:WP_Query:private] => [compat_fields:WP_Query:private] => Array ( [0] => query_vars_hash [1] => query_vars_changed ) [compat_methods:WP_Query:private] => Array ( [0] => init_query_flags [1] => parse_tax_query ) ) )
 

Associated Labs

Research Areas

Innovation/Entrepreneurship

Education

  • Ph.D., Electrical Engineering, 1990
    Cornell University
  • B.S., Electrical Engineering (with honor), 1984
    California Institute of Technology