Method for measuring modulation parameters of digital quadrature-modulated signal

摘要: The signal to be measured is converted into digital form and read a memory 13 using trigger as the reference, of length 1/5 that measured, in vicinity trigger, orthogonal-transformed (14). A frequency error ω 1 transformed output I ,Q estimated (15) used correct (16). corrected 2 subjected processing by receiving filter (17), filtered 3 synchronized with PN code obtain an ideal R ,R Q phase difference τ calculated. are . All signals stored 13, orthogonal transformation (23) so +ω +τ removed, 5 calculate modulation parameters case prior art.