Receiver in a position-finding system and method for position-finding with increased sensitivity
First Claim
1. A receiver in a position-finding system which is configured to ascertain a position based on an evaluation of different propagation times for position-finding signals, the position-finding signals being emitted by a plurality of transmitters at known positions and being received by the receiver, comprising:
- a calculation unit configured to calculate a statistical value from a signal received by the receiver; and
a detector unit configured to compare the statistical value with a threshold value and use the comparison to determine whether the received signal is a position-finding signal or whether the received signal is used for finding the position of the receiver;
an estimation unit configured to estimate a ratio of the signal-carrier power to the noise-power spectral density of the received signal; and
a determination unit configured to determine the threshold value from the estimated ratio of the signal-carrier power to the noise-power spectral density.
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Accused Products
Abstract
The invention relates to a receiver in a position-finding system, having a calculation unit for calculating a statistical value from a received signal, and a detector unit for comparing the statistical value with a threshold value and for determining whether the signal is a synchronized position-finding signal. The system also includes an estimation unit for estimating the quotient of the signal-carrier power and the noise-power spectral density of the signal, and a determination unit for threshold-value determination from the estimated quotient.
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Citations
23 Claims
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1. A receiver in a position-finding system which is configured to ascertain a position based on an evaluation of different propagation times for position-finding signals, the position-finding signals being emitted by a plurality of transmitters at known positions and being received by the receiver, comprising:
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a calculation unit configured to calculate a statistical value from a signal received by the receiver; and
a detector unit configured to compare the statistical value with a threshold value and use the comparison to determine whether the received signal is a position-finding signal or whether the received signal is used for finding the position of the receiver;
an estimation unit configured to estimate a ratio of the signal-carrier power to the noise-power spectral density of the received signal; and
a determination unit configured to determine the threshold value from the estimated ratio of the signal-carrier power to the noise-power spectral density. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for finding a position of a receiver in a position-finding system which is based on the evaluation of different propagation times for position-finding signals, the position-finding signals being emitted by a plurality of transmitters at known positions and being received by the receiver, comprising:
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(a) calculating a statistical value from a signal received by the receiver;
(b) estimating a ratio of the signal-carrier power to the noise-power spectral density of the received signal;
(c) determining a threshold value from the estimated ratio of the signal-carrier power to the noise-power spectral density of the received signal;
(d) comparing the statistical value with the threshold value; and
(e) using the comparison result to determine whether the received signal is a position-finding signal or whether the received signal is used for finding the position of the receiver. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification