Disguised transmission system and method

• US 4,658,436 A
• Filed: 10/28/1982
• Issued: 04/14/1987
• Est. Priority Date: 10/28/1982
• Status: Expired due to Fees

• Current Assignee: L-3 Communications Cincinnati Electronics Corporation (L3Harris Technologies, Inc.)
• Original Assignee: L-3 Communications Cincinnati Electronics Corporation (L3Harris Technologies, Inc.)
• Inventors: Hill, Terrance J.
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US06/437,309
• Time in Patent Office: 1,629 Days
• Field of Search: 455/26, 455/52, 455/67, 375/1, 375/40, 375/2.1, 375/2.2, 333/165, 178/22.15, 343/18 E
• US Class Current: 380/31
• CPC Class Codes: H04K 1/06 by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards
• CPC Class Codes: H04K 3/224 with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer
• CPC Class Codes: H04K 3/25 based on characteristics of target signal or of transmission as countermeasure against surveillance H04K3/827, e.g. using direct sequence spread spectrum or fast frequency hopping spread spectrum techniques H04B1/69
• CPC Class Codes: H04K 3/827 using characteristics of target signal or of transmission as countermeasure against jamming H04K3/25, e.g. using direct sequence spread spectrum or fast frequency hopping spread spectrum techniques H04B1/69

Abstract

Data signals are transmitted at a variable information rate with variable power so the transmitted information rate and transmitted power level increase and decrease together to simulate high frequency fading and enable the data transmission to be disguised. The information rate and power vary in response to a predictable noise-like function generator.

Claims