发明名称 |
Ramp-weighted correlation with oversampling |
摘要 |
A digital range correlator (50) for performing triangular ramp-weighted correlation relative to a reference word and providing an output data rate higher than the word rate. Two correlator channels (70, 80) are provided. Channel 70 provides a ramp-weighted segment sum over a word segment, with N word segments per L-bit word, wherein each received bit of a received word segment is multiplied by a corresponding ramp weight, and the corresponding product is in turn multiplied by the corresponding delayed reference word bit. The corresponding products over the word segment are accumulated to form a ramp-weighted word segment sum. Channel 80 provides a corresponding uniformly weighted word segment sum. The respective ramp-weighted and uniformly weighted word segment sums formed over the two preceding word segments are stored in a shift register. The ramp-weighted segment sums are scaled by +1 or -1 to represent the proper slope of the triangular weighting and accumulated. The uniformly-weighted segment sums are scaled by appropriate integers from 1 to N to represent the triangular weighting, and accumulated with the accumulated ramp-weighted scaled segment sums, and with appropriate normalization factors provide the correlator output signals. Digital Doppler or low pass filtering can be applied to improve the performance.
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申请公布号 |
US5483243(A) |
申请公布日期 |
1996.01.09 |
申请号 |
US19940276015 |
申请日期 |
1994.07.15 |
申请人 |
HUGHES MISSILE SYSTEMS COMPANY |
发明人 |
GRAMLICH, GARY A.;MAKINO, ROY H.;MOREL, DENNIS W.;URBANSKI, DANIEL J.;KAROBONIK, JOHN R. |
分类号 |
G01S7/292;G01S7/285;G01S13/28;G01S13/524;(IPC1-7):G01S13/00;G06F17/15 |
主分类号 |
G01S7/292 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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