Method of determining the position of a target using transmitters of opportunity
First Claim
1. In a communication system wherein pre-stored codes are used in transmissions as part of the communication protocol, a method of determining the position of a target comprising the steps of:
- a) providing a transmitter or to transmit a signal to the target, b) providing a plurality of receivers, in communication with each other, to receive signals reflected from said target, the receivers being time or phase synchronised;
c) determining the time of arrival information of said code of reflected signal at each receiver by continuously correlating said received signal with the prestored codes in the receiver;
d) using information pertaining to the position of each receiver and with the information obtained from step c), determining the target position.
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Accused Products
Abstract
A method of determining the position of a target comprising the steps of: providing a transmitter or a plurality of transmitters to transmit a signal to the target, providing a receiver or a plurality of receivers to receive signals reflected from said target. Determining the time of arrival information of said reflected signal at the or each receiver; using information pertaining to the position of the or each receiver and/or the or each transmitter and with the information obtained determining the target position. Preferably the signal includes a modulated or coded portion unique to the transmitter; and said signal portion is associated with the or each particular transmitter by virtue of said signal portion. The signal maybe a mobile phone transmission, DAB, digital TV, digital Radio or digital satellite transmissions.
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Citations
8 Claims
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1. In a communication system wherein pre-stored codes are used in transmissions as part of the communication protocol, a method of determining the position of a target comprising the steps of:
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a) providing a transmitter or to transmit a signal to the target, b) providing a plurality of receivers, in communication with each other, to receive signals reflected from said target, the receivers being time or phase synchronised;
c) determining the time of arrival information of said code of reflected signal at each receiver by continuously correlating said received signal with the prestored codes in the receiver;
d) using information pertaining to the position of each receiver and with the information obtained from step c), determining the target position. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. In a communication system wherein pre-stored codes are used in transmissions as part of the communication protocol, a method of determining the position of a target comprising the steps of:
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a) providing a plurality of transmitters to transmit each a signal to the target, said transmitters being time or phase synchronized;
b) providing a receiver to receive signals reflected from said target and wherein said signals are set out pre-set times known to the receiver;
c) correlating said received signal with the pre-stored codes in each receiver to identify the transmitter of a particular signal;
d) the receiver determining the time delay in receiving said signal by subtracting the time of arrival of a pre-stored code of each reflected signal from each transmitter from the known time the pre-stored code was sent, e) using information known to the receiver pertaining to the position of each transmitter and with the timing information obtained from step c), determining the target position.
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Specification