Integral modulation

Details Integral modulation Integral modulation

G - Physics

01

S

G01S 5/06 (2006.01) H04B 1/69 (2006.01)

Patent

CA 2080024

2080024 9116639 PCTABS00008 A slope controlled modulation Spread Spectrum TDMA System used in tracking the absolute position of moving targets by radio or other electromagnetic or acoustic radiated energy systems having a master clock (M) transmitting time reference to a network of fixed receivers (RX1, RX2...), a mobile transmitter in a vehicle (V) generating a signal (Tx) with a stimulus preceding the prescribed modulation signal. This signal is of incremental and/or decremental time and/or frequency, amplitude, phase or interval modulation domain(s). All the fixed receivers (RX1, RX2...) may be normalized to an absolute reference (M) common to all receivers based on propagation time differences between each receiver and the stationary time reference (M). The known relationship of receiver timing differences are used to calculate time of arrival epochs from any mobile transmitter and then substracting these timing differences from the calculated time of arrival epochs from the transmitters. These are then sent to a region computer (C) to calculate time of arrival differential of epochs relative to each receiver (RX1, RX2...) in order to provide a position fix of the transmitter (V). The transmitter (V) has a facility to produce the stimulus in signal (Tx) as chirp modulation from which the slope controlled modulation is derived and the receivers (RX1, RX2...) having the facility to decode stimulus events.

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