Page 59 - 卫星导航2021年第1-2合期

Chen et al. Satell Navig (2021) 2:12 Page 4 of 7

M i M i+1 M i+2 M i+3 M i+4 M i+5 M i+6
ECDSA-I DS 1 DS 1 DS 1 reserve DS 2 DS 2 DS 2 reserve DS 3
(1/3) (2/3) (3/3) (1/3) (2/3) (3/3) (3/3)
Authenticationthentication AuthenticationAuthentication AuthenticationAuthentication AuthenticationAuthentication Authenticationthentication AuthenticationAuthentication AuthenticationAuthentication
Au
Au
data
data data data data data data data
data
data
data
data
data
data
Latency
TBA
ECDSA-Q M i M i+1 M i+2 M i+3 M i+4 M i+5 M i+6 M i+7 M i+8 M i+9 M i+10 M i+11

DS 0 DS DS DS
DS 0 DS 1 DS 1 DS 1 1 DS 2 DS 2 DS 2 2 DS 3 DS 3 DS 3 3 DS 3 DS 3
(3/3) reserve (1/3) (2/3) (3/3) reserve (1/3) (2/3) (3/3) reserve (1/3) (2/3) (3/3) reserve (1/3) (2/3)
(3/3)
(3/3)
(3/3)
(3/3)
Authentication Authentication Authentication Authentication
data data data data
Latency
TBA

M i M i+1 M i+2 M i+3 M i+4
1 2 3 4 5
MAC 1 MAC k 0 k 0 reserve MAC 2 MAC k 1 k 1 reserve MAC 3 MAC k 2 k 2 reserve MAC 4 MAC k 3 k 3 reserve MAC 5 MAC k 4 k 4 reserve reserve
TESLA-I
Authentication Authentication Authentication Authentication Authentication
data data data data data
Latency

TBA

TESLA-Q M i M i+1 M i+2 M i+3 M i+4 M i+5 M i+6 M i+7 M i+8 M i+9 M i+10 M i+11

MAC1 MAC1 MAC 1 k k 00 k 0 reserve MAC 2 MAC2 MAC2 k k 11 k 1 reserve MAC 3 MAC3 MAC3 k k 22 k 2 reserve MAC4 MAC4 MAC4 k k 33 k 3 reserve MAC5 MAC5 MAC5 k k 44 k 4 reserve
Authentication
data
Latency
TBA
Fig. 3 Simplifed scheme of the implementations of SBAS message authentication