Position fixing system

Details Position fixing system Position fixing system

2007-05-08

2007-05-08

Ha, Dac (Department: 2611)

Pulse or digital communications

Spread spectrum

Frequency hopping

C132S260000

Reexamination Certificate

active

10234178

ABSTRACT:
In a first aspect the present invention provides a method of producing an ultra wide band signal in which a carrier signal is modulated by a spreading waveform which is a periodic deterministic wideband signal and the frequency of the carrier signal is changed by a predetermined amount at predetermined intervals (the reciprocal of this interval being the hopping rate), wherein there is a harmonic relationship between the carrier frequency, the predetermined amount of frequency change, and the period of the spreading waveform. In this way, an ultra wide band signal is created using both direct sequence and frequency hopping techniques and the signal so created may be detected using a coherent detector at a receiver. This provides a wide bandwidth signal, or even an ultra wide bandwidth (UWB) signal which mitigates the problems of multi-path signals (through coherent combining across a wide bandwidth) and also interference.

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N. Koichi, WPI Abstract, AN 1997-172164, JP 9-036795, 2 pages, “Spread Spectrum Communication Relay System for Wireless Communication—Has.Repeating Installation Whose Transmitter Carries out Retransmission of RF Signal Delayed by Delay Circuit” Jul. 20, 1995.

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