H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/2, 343/82
H04J 1/02 (2006.01) G01S 5/06 (2006.01) H04B 1/707 (2006.01) H04J 13/00 (2006.01) H04J 13/02 (2006.01)
Patent
CA 1319183
ABSTRACT A spread-spectrum transmission system wherein a plurality of spread-spectrum signals are frequency division multiplexed by offsetting the centre or carrier frequencies of the spread-spectrum signals by a fraction of the spectral-line spacing of the signals. The signals are generated by modulating a carrier with a pseudo-noise (PN) code signal. Demultiplexing is achieved by generating the same PN code in a code generator 47 and mixing the PN code with the received signal in a mixer 45. The epoch of the code generated by the generator 47 is then advanced or retarded in response to an epoch control signal 48 generated by a controller 46. The mixed signal is passed through a narrowband filter 49 to select the baseband signal which is then fed to the controller 46 to enable the generation of the epoch control signal 48. When applied to a vehicle tracking system, the relationship between the epoch of the noise code and the reference signal 50 is used to indicate the relative propagation delay, when correlation with the received signal is achieved. The delay information, when combined with information from receivers at other locations, can be used to calculate transmitter position.
528509
Hurst Gregory Charles
Yerbury Michael John
Bereskin & Parr
British Aerospace Australia Limited
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