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Figures
- FIGURE 1
Code migration and frequency drift (right) within a search cube of code phase × frequency bin × integration time (left)
- FIGURE 2
Standalone direct acquisition of BOC signals with massive parallel correlators in the CCLCI scheme
- FIGURE 3
Illustration of key operations for coherent combining and long coherent integration (CCLCI)
- FIGURE 4
Division of long integration (CM) into multiple short-term correlations (cm, m = 1, 2, …, M)
- FIGURE 5
Coarse frequency search (1st stage) and refined frequency search (2nd Stage)
- FIGURE 6
Illustration of code migration and its effect on correlation peak values
- FIGURE 7
Frequency divergence and compensation
- FIGURE 8
Example of long coherent integration over 1 second at three frequency search bins
- FIGURE 9
An illustrating example of code migration
- FIGURE 10
Impairments affecting effective gain of long coherent integration
- FIGURE 11
1-s correlations over time-frequency search grid
- FIGURE 12
Coherent vs. coherent/non-coherent integrations of even and odd chips
- FIGURE 13
Bitwise correlations of odd chips on upper and lower sidebands: Secondary peaks when the signal straddles two frequency bins
- FIGURE 14
Block diagram of interference signal injection
- FIGURE 15
Peak-to-peak ratio of CCLCI vs. PDI for different J/S
- FIGURE 16
PPR vs. PDI of combined coherent and non-coherent integration schemes under different J/S
- FIGURE 17
Estimated ROC curves for different PDIs under SNR = −10 dB and J/S = 53 dB from Monte Carlo simulations
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