TRANSIT (also known as NAVSAT), the first satellite navigation system, used by the US Navy, was successfully tested
TRANSIT (also known as NAVSAT), the first satellite navigation system, used by the US Navy, was successfully tested
Used a constellation of five satellites
It could provide a navigational fix (200 meter accuracy) approximately once per hour
Led by F.T. McClure (Johns Hopkins APL)
Doppler shift, encoded signal
Used for ballistic missile submarine positioning
Funded by ARPA, retired in 1996
AT&T designed the Dataphone, the first commercial modem, specifically for converting digital computer data to analog signals for transmission across its long distance network
AT&T designed the Dataphone, the first commercial modem, specifically for converting digital computer data to analog signals for transmission across its long distance network
The development of equalization techniques and bandwidth-conserving modulation systems improved transmission efficiency in national and global systems