11075 Santa Monica Blvd SUITE 350, Los Angeles, CA 90025 1034 Somera Rd, Los Angeles, CA 90077 11075 Snta Monica Bl, Westwood, CA 96137 (310) 479-9021, (310) 479-5820
Jalal Alisobhani Director Of Product Development
Navcom Technology, Inc Mfg Radio/TV Communication Equipment Business Consulting Services · Radio and T.V. Communications Equipment
20780 Madrona Ave, Torrance, CA 90503 20770 Madrona Ave, Torrance, CA 90503 (310) 381-2000, (310) 381-2645
Jalal Alisobhani - Corona Del Mar CA Donald K. Leimer - Rancho Palos Verdes CA Richard Kai-Tuen Woo - Orange CA Mark Philip Kaplan - Culver City CA
Assignee:
Navcom Technology, Inc. - Redondo Beach CA
International Classification:
H04B 1707
US Classification:
375141, 375142, 375145, 375149, 375150
Abstract:
A communication device includes a transmitter and receiver. The transmitter includes an M-ary encoder configured to generate an M-1 number of distinctive symbols each comprising k bits. M is equal to 2 and k is a positive integer. The transmitter also includes a code generator configured to produce spread spectrum codeword sequences based on the symbols generated by the M-ary encoder and based on a first and a second Gold code polynomials. The transmitter sends a radio signal based on the spread spectrum codeword sequences. The receiver is configured to receive the radio signal. The receiver includes a first shift register configured to receive an input signal generated based on the received radio signal and a second shift register configured to receive and circularly shift a locally generated codeword sequence that is identical to the codeword sequence used to encode the symbols. The receiver also includes an accumulator coupled to the first and second shift registers and configured to multiply and accumulate stored values in the first and second shift registers each time the second shift register is circularly shifted and a selecting device coupled to the accumulator and configured to identify one symbol from the plurality of symbols based on outputs from the accumulator. A method corresponding to the device is also provided.
George A. Lucchi - Granada Hills CA Jalal Alisobhani - Northridge CA
Assignee:
Sperry Corporation - New York NY
International Classification:
G01S 1395 G01S 728
US Classification:
343 5W
Abstract:
An apparatus for the suppression of terrain generated clutter in a pulsed weather radar system. Weather induced returns typically having scintillation frequencies greater than 50 Hz may be isolated from terrain backscattered signals utilizing a digital filter technique having a sampling rate equal to the pulsed radar PRF.