초록 ▼

A secure, portable position locating radio has a geolocation receiver providing local position and timing information from geolocation means (e.g. GPS satellites) and a local transceiver for sending local position information to a communication system (e.g., an airborne or orbiting transceiver). A c

A secure, portable position locating radio has a geolocation receiver providing local position and timing information from geolocation means (e.g. GPS satellites) and a local transceiver for sending local position information to a communication system (e.g., an airborne or orbiting transceiver). A crypto unit is provided between the receiver and local transceiver for encrypting the local position information prior to transmission. A data processor coupled to the local transceiver, receiver and crypto unit controls operation of the device, including storing local position information and separating signals broadcast by the communication system into those intended or not intended for the device. An external interface and display and a real-time clock (e.g., slaved to the GPS receiver) are also coupled to the data processor. Encryption keys and message abbreviation codes are conveniently loaded into the device from a demountable accessory unit at the interface, and stored therein.

대표청구항 ▼

[ We claim:] [1.] A transceiver, said transceiver being a portable radio transceiver, said transceiver comprising:first radio receiver and a second radio receiver, a radio transmitter and an antenna supported by a common housing, wherein said first radio receiver receives first signals from a first

[ We claim:] [1.] A transceiver, said transceiver being a portable radio transceiver, said transceiver comprising:first radio receiver and a second radio receiver, a radio transmitter and an antenna supported by a common housing, wherein said first radio receiver receives first signals from a first geolocation means for determining location information and high accuracy clocking information, wherein said location information describes a location of said transceiver;clock means, supported by said common housing and coupled to said first radio receiver, said clock means for providing timing and frequency control signals, said clock means slaved to said high accuracy clocking information;message encryption means, supported by said common housing and coupled to said first radio receiver, for encrypting said location information using an alterable private encryption key to provide an encrypted transceiver location information prior to transmission to a communication system, wherein said radio transmitter is coupled to said antenna and said message encryption means and receives timing and frequency control signals from said clock means, said radio transmitter for sending another signal containing said encrypted transceiver location information to said communication system, and wherein said second radio receiver receives second signals from said communication system.