发明名称 |
Unbiased code phase discriminator |
摘要 |
A feedback control law steers a reference phase that tracks the phase of a received code sequence. The reference phase clocks a track-reference signal consisting of a series of correlation kernels, over which data is extracted and then summed in various combinations. The correlation kernels are designed in such a manner that errors caused by multipath are eliminated or substantially reduced. Furthermore, the areas of the correlation kernels are balanced across level-transitions of a code and non-transitions to eliminate phase biases when tracking specific satellites. Extra care must be taken to balance the correlation kernels in this manner due to a little known aspect of GPS C/A codes. Specifically, not all C/A codes have the same ratio of level-transitions to non-transitions as has been assumed in prior art. |
申请公布号 |
AU2009255554(B2) |
申请公布日期 |
2013.08.29 |
申请号 |
AU20090255554 |
申请日期 |
2009.02.18 |
申请人 |
HEMISPHERE GNSS INC.;WHITEHEAD, MICHAEL;MILLER, STEVEN |
发明人 |
WHITEHEAD, MICHAEL L.;MILLER, STEVEN R. |
分类号 |
H04B7/00 |
主分类号 |
H04B7/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|