Patent ID: 7071866
Filing Date: 2006-07-04
Classification: G01S

Abstract:
1. A method for providing spread spectrum communication between first and second apparatus which transmit and receive RF pulse type signals, comprising the steps of: generating a first message signal by said first apparatus consisting of a sequence of modulated RF pulses; transmitting the RF pulses of the first message signal to the second apparatus; receiving the RF pulses of the first message signal transmitted by the first apparatus by the second apparatus; generating a second message for transmittal to the first apparatus upon receipt of the first message; encoding in the second apparatus alternate RF pulses in the sequence of the received first message with the second message by applying a pseudo random time delay and a pseudo random phase shift to each of the alternate RF pulses; transmitting encoded alternate RF pulses containing the second message back to the first apparatus as a relatively low power level spread spectrum transmission during intervening pulses between the alternate pulses of the RF pulses of the first message; receiving the encoded alternate RF pulses containing the second message by the first apparatus; decoding the encoded RF pulses containing the second message; and displaying the second message by the first apparatus.