Fig 1

Flow chart of set partitioning algorithm"

Fig 2

Signal model for narrowband mode"

Fig 3

Flow chart of the proposed algorithm"

Fig 4

Scattering point layout of two targets in wideband mode"

Fig 5

Estimation results of two algorithms"

Fig 6

Estimation results of MRSP-E algorithm"

Table 1

Comparison of RMSEs between the proposed algorithm and PTE algorithm"

Table 2

RMSE of MRSP-E algorithm results"

Fig 7

Comparison of computation time of the three algorithms"

Fig 8

RMSE of position parameter ${\boldsymbol{\alpha}}$ estimation in range cell of the two algorithms "

Fig 9

RMSE of angel parameter ${\boldsymbol{\eta}}$ estimation of the two algorithms "

Fig 10

Comparison of computation time v.s. ${{\boldsymbol{N}}_{\boldsymbol{d}}}$ of the two algorithms "

Fig 11

Comparison of angel estimation RMSE of the two algorithms"

Fig 12

Comparison of computation time v.s. SNR of the two algorithms"

Fig 13

Position of the ships"

Fig 14

HRRP Ship A model and its HRRP"

Fig 15

HRRP Ship B model and its HRRP"

Fig 16

HRRP in the sum channel of the unresolved targets combination in 1 MHz and 100 MHz bandwidths"

Fig 17

HRRP of unresolved targets and the corresponding ${\boldsymbol{x}}_{\boldsymbol{k}}^{\boldsymbol{2}} $ "

Fig 18

Estimation results of two algorithms"

Table 3

Comparison of azimuth estimation RMSEs of the proposed algorithm and PTE algorithm with the true value being 0.86 and ?0.57"