Lockheed Martin Corporation

Harold D Babb

William Joseph Taft

Michael Brooks

George Silverman

David O Sieberns

Christopher C Bianchi

James E Bowe

Anthony Eddy

A dual rate transmitter may include a modulator circuit configured to modulate orthogonal signals to generate a quadrature modulated signal. An amplifier may be configured to amplify the quadrature modulated signal to produce an amplified signal. A quadrature partial response (QPR) filter may be configured to process the amplified signal to generate an output signal. The QPR filter may allow for full rate QPR and half rate QPSK operation of the transmitter device. The output signal may be transmitted via an antenna. This transmitter approach provides a bandwidth efficiency improvement, as the QPR signal may be operated at twice the rate within the same bandwidth as the quadrature modulated signal using a common saturated transmitter implementation, reducing quantity of components and the resulting mass and cost reduction for a space transmitter solution. Additionally, this approach of using QPR signaling provides greater power efficiency.

Dual rate communication

The ability to securely transmit information between two locations is of paramount importance in today's communication systems. Before the invention of digital transmission methods, analog transmission was commonplace. However, today's communication systems rely almost exclusively on transmitting information digitally. Digital transmission has become commonplace because it provides optimal accuracy and security. However, digital transmission also has drawbacks, for example, increased bandwidth requirements and the loss of information when converting information between the analog and digital domains. The present invention relates to a method and apparatus for encrypting analog data while minimizing data loss and conserving bandwidth.

Analog encryption

Growing community of inventors

Cupertino, CA, United States of America

Harold D Babb