Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1974-11-01
1977-07-19
Birmiel, Howard A.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
325 65, 325126, 333 30R, 343 172PC, H04B 1500, H03H 710, H03H 730
Patent
active
040371590
ABSTRACT:
A communication system that is difficult to jam has a transmitter transmitting successive chirp signals, which start at different initial frequencies and all have the same frequency - time slope. At the transmitter successive selections are made from among the different available chirp signal frequencies in accordance with a predetermined pseudorandom program that is known at the receiving station. The receiver has a chirp matched filter capable of receiving all of the different chirps but, being a distributed filter, it delays the different received chirps by differing amounts depending upon the initial frequency of each chirp. The output of the chirp filter is envelope-detected, and the resulting pulse signal is passed through a time gate that is gated on at a time that is selected in accordance with the predetermined program. The system has advantages for anti-jam communications, multiple-access communications, frequency diversity radio, and coding using multiple frequencies, as examples. The chirp matched filter is conveniently a surface wave device.
REFERENCES:
patent: 3363248 (1968-01-01), Nicodemus
patent: 3736587 (1973-05-01), Bush et al.
patent: 3795879 (1974-03-01), Whitehouse et al.
patent: 3800247 (1974-03-01), Tancrell et al.
patent: 3845419 (1974-10-01), Nudd
patent: 3875571 (1975-04-01), Davis, Jr. et al.
patent: 3878525 (1975-04-01), Alpers
patent: 3887918 (1975-06-01), Bailey et al.
Birmiel Howard A.
Harris Corporation
LandOfFree
Chirp communication system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Chirp communication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chirp communication system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2295659