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We considered the range of PPP online services that solve the problem of high-precision coordinates and receiver time scale shift determination for the RINEX daily records. The comparative estimation of exact indicators of position determination for different geoids is given. The results contains the recommendations for use the online PPP services to solve the problem of time scales comparison.
The paper presents the search of ranging codes based on shortened Kasami and bent sequences. The criterion of minimum multiple access interference (MAI) level in wide range of Doppler shifts is applied.
Several continuous phase modulation (CPM) models along with binary phase shift keying (BPSK) are compared as for the signal delay estimate potential accuracy with multipath propagation, spectral resources being tightly limited. Despite of the effects of the multipath interference, the CPM formats remain always superior to the BPSK format at least by 8–10 dB under the worst conditions despite of the...
The equation is derived for the autocorrelation function of a continuous-phase manipulation signal covering both full and partial response cases and giving way for calculating multiple access interference mean power in a CDMA signature ensemble. Modulation modes are rated according to the multiple access interference suppression capability and priority of the classical minimum-shift keying in this...
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