Method and apparatus for spreading signal acquisition and tracking
First Claim
1. A spreading signal acquisition and tracking method, said method comprising steps of:
- receiving a spreading signal;
coherently integrating the spreading signal to obtain a coherent integration result of a coherent integration interval;
accumulating a first number of the coherent integration results from a first time point to obtain a non-coherent integration result; and
accumulating the first number of the coherent integration results from a second time point to obtain another non-coherent integration result, said second time point being later than said first time point by a second number of the coherent integration intervals.
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Abstract
A spreading signal acquisition and tracking method and apparatus is proposed. In accordance with the present invention, coherent integrations are performed by segments and stored for a non-coherent integration. A better freedom of the non-coherent interval selection is provided. The window of the non-coherent integration is sequentially and gradually shifted to achieve better update rate to its detection circuit and to improve searching and tracking for a spreading signal. By using the present invention, rapid signal acquisition can be achieved even when intensity of the spreading signal is very weak, or even when deeper signal blocking or jamming occurs.
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Citations
19 Claims
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1. A spreading signal acquisition and tracking method, said method comprising steps of:
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receiving a spreading signal; coherently integrating the spreading signal to obtain a coherent integration result of a coherent integration interval; accumulating a first number of the coherent integration results from a first time point to obtain a non-coherent integration result; and accumulating the first number of the coherent integration results from a second time point to obtain another non-coherent integration result, said second time point being later than said first time point by a second number of the coherent integration intervals. - View Dependent Claims (2, 3, 4, 5)
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6. A spreading signal acquisition and tracking method, said method comprising steps of:
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receiving a spreading signal; coherently integrating the spreading signal to obtain a coherent integration result of a coherent integration interval; storing the coherent integration result into a memory device; non-coherently accumulating the coherent integration results from the memory device to obtain a signal energy; comparing the signal energy to a threshold; and executing a specific operation when said signal energy achieves said threshold, wherein said threshold is obtained by analyzing probability of false alarm rate. - View Dependent Claims (7, 8)
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9. A spreading signal acquisition and tracking apparatus comprising:
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an antenna receiving a spreading signal; an RF processing block for down converting, filtering and amplifying the received signal; a correlator for coherently integrating the received signal to obtain a coherent integration result for a coherent integration interval; a memory device; and a processor accumulating a first number of the coherent integration results from a first time point to obtain a first non-coherent result, storing the first non-coherent result into said memory device, accumulating the first number of the coherent integration results from a second time point to obtain a second non-coherent result, and storing the second non-coherent result into said memory device, wherein said second time point being later than said first time point by a second number of the coherent integrations-intervals. - View Dependent Claims (10, 11, 12, 13)
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14. A spreading signal acquisition and tracking apparatus comprising:
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an antenna receiving a spreading signal; an RF processing block for down converting, filtering and amplifying the received signal; a correlator for coherently integrating the received signal to obtain a coherent integration result for a coherent integration interval; a memory device for storing the coherent integration result; and a processor non-coherently accumulating the coherent results stored in the memory device to obtain a signal energy, and instructing to execute a specific operation when the signal energy achieves a threshold, wherein said threshold is obtained by analyzing probability of false alarm rate. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification