This worldwide satellite-based communications system went from dream to reality in a decade but quickly failed in the market; its revival took persistence and luck, plus a new customer base. Of course, there were also significant technological advances required in many areas, including designing and building longer-life electronics despite the unavoidable effects of space radiation […]
The Iridium global satcom system, Part 4: Lessons learned
This worldwide satellite-based communications system went from dream to reality in a decade but quickly failed in the market; its revival took persistence and luck, plus a new customer base. Today, Iridium is a viable mobile, satellite-based, which handles voice and data. As with standard cellular systems, its users have little or no idea of […]
The Iridium global satcom system, Part 3: Very nearly crash and burn
This worldwide satellite-based communications system went from dream to reality in a decade but quickly failed in the market; its revival took persistence and luck, plus a new customer base. Iridium’s launch, crash, and nearly burn (literally) The Iridium communications service was initiated on November 1, 1998, with a call by then-Vice President Al Gore. […]
The Iridium global satcom system, Part 2: The implementation
This worldwide satellite-based communications system went from dream to reality in a decade but quickly failed in the market; its revival took persistence and luck, plus a new customer base. The first part of the article explained the inspiration and rationale for the Iridium system. Three major elements were required to make the Iridium concept […]
Iridium global satcom system: Brilliant design, terrible business, last-minute reprieve, Part 1
This worldwide satellite-based communications system went from dream to reality in a decade but quickly failed in the market; its revival took persistence and luck, plus a new customer base. Business failures of companies with grand schemes and grandiose plans are part of the realities of technology-driven visionaries. Sometimes, however, the project is so large […]
LIDAR and Time of Flight, Part 4: Circuitry and advances
LIDAR systems and ToF techniques are critical to providing self-driving cars with a detailed picture of the surrounding and is used in many research applications as well. This is the final part of a four-part series on LIDAR systems and ToF techniques. The high-level block diagram of a LIDAR system inherently glosses over the many […]
LIDAR and Time of Flight, Part 3: Emitters, sensors, and scanners
LIDAR systems and ToF techniques are critical to providing self-driving cars with a detailed picture of the surrounding and is used in many research applications as well. This is part three of a four-part series on LIDAR systems and ToF techniques. At the front end of a LIDAR system is the photon emitter and its […]
LIDAR and Time of Flight, Part 2: Operation
LIDAR systems and ToF techniques are critical to providing self-driving cars with a detailed picture of the surrounding and is used in many research applications as well. This is part two of a four-part series on LIDAR systems and ToF techniques. Just as for radar and sonar, the LIDAR concept is simple but the execution […]
LIDAR and Time of Flight, Part 1: Introduction
LIDAR systems and ToF techniques are critical to providing self-driving cars with a detailed picture of the surrounding and is used in many research applications as well. Many of the major automobile vendors, along with well-known non-auto companies such as Google, are devoting major resources to developing autonomous vehicles (often called “self-driving cars”). These vehicles […]
Inertial Measurement Units: The hidden key to Apollo success, now a MEMS device (Part 2)
Part 1 of this article looked at the classic, highly refined, mature gyroscope-based IMU used for the Apollo moon mission; this part looks at the very different technologies which have largely replaced it. Gyro-based IMU: obsolete, or not? Inertial navigation relies on a stable platform with an orientation which is fixed in space and maintains […]