Location History:
- Kariya, JP (1995 - 1997)
- Aichi-gun, JP (1997 - 1999)
Company Filing History:
5 out of 5,207 
1 out of 90 
Years Active: 1995-1999
Title: Seiji Ishikawa: Innovator in GPS Technology
Introduction
Seiji Ishikawa is a notable inventor based in Kariya, Japan. He has made significant contributions to the field of positioning systems, particularly utilizing GPS technology. With a total of 5 patents to his name, Ishikawa's work has advanced the accuracy and reliability of navigation systems.
Latest Patents
Ishikawa's latest patents include a positioning system that utilizes GPS satellites. This innovative system detects the rate of change in Doppler shift of radio waves transmitted from GPS satellites. By identifying extraordinary radio waves caused by multi-path interference, the system excludes unreliable signals from positioning calculations. Additionally, he has developed an onboard positioning system that determines vehicle speed and azimuth using information from GPS satellites and a piezoelectric oscillation gyro. This system enhances positioning accuracy and eliminates the need for a vehicle speed sensor.
Career Highlights
Throughout his career, Seiji Ishikawa has worked with prominent companies such as Aisin Seiki Kabushiki Kaisha and Japan Radio Co., Ltd. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking innovations in GPS technology.
Collaborations
Ishikawa has collaborated with notable colleagues, including Tomio Yasuda and Toshimitsu Oka. Their combined expertise has fostered advancements in the field of navigation systems.
Conclusion
Seiji Ishikawa's contributions to GPS technology have significantly impacted the accuracy and reliability of positioning systems. His innovative patents and collaborations highlight his role as a leading inventor in this essential field.