Fig 1

Schematic diagram of signals received by two channels"

Fig 2

Flowchart of echo signal likelihood ratio detection"

Fig 3

Echo signal diagram of Shenzhou spacecraft electromagnetic simulation model after double-channel correlation"

Fig 4

Relationship between the SNR after correlation ( ${{\bf{SNR}}_{\boldsymbol{1}}}$ )and the echo signal’s SNR ( ${\bf{SNR}}_{\boldsymbol{e}}$ ) "

Fig 5

Flow chart of radar target double-channel sliding window correlation detection"

Fig 6

Graph of relation between false alarm probability and threshold coefficient K "

Fig 7

Model diagram of electromagnetic simulation"

Fig 8

Location diagram of the model"

Table 1

Simulation parameters"

Fig 9

Two channel echo signal diagrams under ideal conditions"

Fig 10

Echo signal diagram of two channels under 12 dB SNR"

Fig 11

Test statistic of sliding window correlation of two channel echo signal"

Fig 12

Echo signal diagram of two channels after correlation processing"

Table 2

SNR of the dual-channel echo signals after correlation processing in the case of 12 dB SNR dB "

Fig 13

Diagram of the SNR of channel 1 echo signal ${\bf{SNR}}_{\boldsymbol{1}}$ and SNR after correlation processing ${{\bf{SNR}}_{\boldsymbol{c}}}$ "

Table 3

SNR of channel 1 echo signal ${\bf{SNR}}_{\boldsymbol{1}}$ and SNR after correlation processing ${{\bf{SNR}}_{\boldsymbol{c}}}$ dB "

Fig 14

Curve of detection probability of different detectors as a function of SNR"

Fig 15

Two channel echo signal diagrams of space target 1"

Fig 16

Echo signal diagram of the 2000th cycle"

Fig 17

Test statistic of sliding window correlation of the 2000th cycle echo"

Fig 18

Echo signal diagram of the 2200th cycle"

Fig 19

Test statistic of sliding window correlation of the 2200th cycle echo"

Fig 20

Graph of detection results of four detectors on space target 1"

Fig 21

Two channel echo signal diagrams of space target 2"

Fig 22

Echo signal diagram of the 2200th cycle"

Fig 23

Test statistic of sliding window correlation of the 2200th cycle echo"

Fig 24

Echo signal diagram of the 2400th cycle"

Fig 25

Test statistic of sliding window correlation of the 2400th cycle echo"

Fig 26

Graph of detection results of four detectors on space target 2"

Table 4

Detection probability of four detectors under different SNRs (partial SNR)"