System for preventing global positioning satellite signal recept

Cryptography – Cryptanalysis

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

380 49, 342357, H04L 900

Patent

active

058224297

ABSTRACT:
A selective or tailored system for denying global positioning satellite (GPS) signal reception to unauthorized GPS receivers yet enabling authorized receivers to maintain access to the GPS system. The invention includes two basic units, the first being a tailored jamming unit which radiates an encoded denial or jamming waveform and the second being one or more receiver units including an interference or jamming signal suppression system which allows GPS user equipments to decode and suppress the jamming signal and receive the GPS satellite signal in the denial environment. The receiver unit decodes the encoded jamming signals. The jamming or denial signals, in its simplest form, employs a bi-polarization keying (BPK) defined as synchronously switching and radiating between two (or more) polarization states (or radiators) at a near 100-percent denial duty-cycle. The radiated signal's polarization, effective radiated power (ERP) level, noise bandwidth and density, and keying modulation (or switching rate) of the radiators are selected to provide sufficient diversity of the interference signal in victim GPS system to prevent normal C/A and/or P(Y) code receiver operation. The encoded switching modulation waveform to control switching between the denial polarization states uses a pseudo-noise encryption technique which allows asynchronous reception, decoding and synchronization for authorized users possessing essential codes, time information, and secure matched synchronization techniques implemented in an adaptive polarization feed network prior to inputting to the GPS receiver. The transmit system or network can deny GPS equipment operation over an area controlled by the effective radiated power radiation pattern of the transmit unit. The receive system or network can achieve synchronized polarization mismatch against the denial or jamming sources and also achieve suppression against other forms of interference sources.

REFERENCES:
patent: 3421691 (1969-01-01), Brown
patent: 3883872 (1975-05-01), Fletcher et al.
patent: 4283795 (1981-08-01), Steinberger
patent: 4972431 (1990-11-01), Keegan
patent: 5298908 (1994-03-01), Piele
patent: 5535278 (1996-07-01), Cahn et al.
patent: 5541606 (1996-07-01), Lennen
patent: 5610984 (1997-03-01), Lennen
patent: 5621416 (1997-04-01), Lennen
patent: 5663733 (1997-09-01), Lennen
Proceedings of the National Technical Meeting; Technology and Operations: Partnership for Success in Navigation, Jan. 22-24, 1996, Santa Monica, CA.
New Product Announcement--GPS Interference Suppression Unit, Electro-Radiation Incorporated, 39 Plymouth Street, Fairfield, Fairfield, NJ 07004, Donald W. Hiorth, V.P. Busines Development, Sep. 7, 1995.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

System for preventing global positioning satellite signal recept does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for preventing global positioning satellite signal recept, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for preventing global positioning satellite signal recept will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-321816

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.