Fig.1

True spectrogram of PCAL signal"

Fig.2

Flowchart of real phase extraction method of PCAL signal with optimized FFT resolution"

Fig.3

DCU structure for serial-to-parallel conversion and cumulative averaging operations"

Fig.4

Flowchart of FFT operation in DCU"

Fig.5

Flowchart of parallel unwinding operation implementation"

Fig.6

Schematic diagram of unwinding"

Fig.7

Timing diagram of asynchronous stream concurrency with DTK serial operation queue"

Fig.8

Timing diagram of asynchronous stream concurrency for longer kernel time"

Fig.9

Timing diagram of parallel extraction method of true phase for PCAL signal"

Fig.10

Flowchart of parallel extraction method of true phase for PCAL signal"

Fig.11

Flowchart of signal data acquisition processing"

Fig.12

Hardware platforms and software systems"

Table 1

System hardware instruments and parameters"

Table 2

Domestic DCU server performance parameters"

Table 3

CPU and DCU specific performance parameters"

Fig.13

Block diagram of overall structure of system software"

Fig.14

Published and subscribed topics of DDS middleware in system"

Fig.15

Circular buffer 1"

Fig.16

Circular buffer 2"

Table 4

Circulating buffer parameter setting"

Table 5

Simulation parameters in experiment 1"

Fig.17

PCAL signals' phase frequency curve"

Fig.18

Variation of PCAL signals' phase with time"

Fig.19

Time consumption of improved phase extraction methods at different FFT resolutions"

Fig.20

Operation timing diagram of parallel improved algorithm without asynchronous flow concurrency structure"

Fig.21

Operation timing diagram of parallel improvement algorithm for asynchronous flow concurrency structure"

Fig.22

Acceleration performance of improvement methods and parallel improvement methods"

Table 6

Simulation parameters in experiment 4"

Fig.23

Variation of processing elapsed time with data stream and effective bandwidth in real-time phase extraction system for PCAL signals"