APPARATUS FOR AND METHOD OF MAKING PULSE-SHAPE MEASUREMENTS
First Claim
1. A method of producing measurement pulse shapes associated with code chips of a PRN code in a received signal, the method including the steps of:
- over multiple PRN code chips taking measurements that correspond to samples of the received signal; and
selectively accumulating the measurements into respective ranges that each span a portion of a code chip that is less than the entire chip, the respective ranges being based on estimated code phase angles of the samples.
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Accused Products
Abstract
A receiver includes a pre-correlation filter that forms an image of the average chip shape of a received signal over a specified period of time. The filter includes an array of complex accumulation registers that accumulate measurements that are associated with signal samples from specific ranges of locations, or code chip phase angles, along a spread-spectrum chip. Using the accumulated measurements, the receiver estimates the location of the chip transitions in a direct path signal component. The receiver may thereafter change the starting point, size and number of ranges, such that the accumulation registers accumulate more detail from the chip edges. The receiver in addition may compare the accumulated measurements with a reference pulse shape to determine if any interference is present in the received transmission that will distort ranging information calculated from the received signal.
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Citations
14 Claims
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1. A method of producing measurement pulse shapes associated with code chips of a PRN code in a received signal, the method including the steps of:
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over multiple PRN code chips taking measurements that correspond to samples of the received signal; and selectively accumulating the measurements into respective ranges that each span a portion of a code chip that is less than the entire chip, the respective ranges being based on estimated code phase angles of the samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of producing measurement pulse shapes associated with code chips of a PRN code in a received signal, the method including the steps of:
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over multiple PRN code chips taking measurements that correspond to samples of the received signal; and selectively accumulating the measurements into respective ranges that each span a portion of a code chip that is less than the entire chip and producing respective sums, the assignment of the measurements to the ranges being based on estimated code phase angles of the respective samples. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification