Patent ID: 7006849

Claim:
A spatial domain matched filtering method, comprising the steps of: receiving array digital signals; performing a weighting calculation for the array digital signals and weighting vectors of N B set to obtain a digital beam output signal S B i (n) of N B set; evaluating power value P S Bi (n) of the digital beam output signal within a correlation time period: P S Bi ( n )=α p S B i ( n ) S B i *( n )+(1−α p ) S B i ( n− 1) S B i *( n− 1) normalizing the beam output signal S B i (n) to obtain a power normalized digital beam output signal S ~ Bi ⁡ ( n ) = S Bi ⁡ ( n ) P S Bi ⁡ ( n ) , wherein, prefix “*” indicates a complex conjugation calculation, α p is a constant, 0<α p <1; correlating the power normalized digital beam output signal {tilde over (S)} B i (n) with a reference signal and evaluating a correlation coefficient Coeff i reflecting energy of an expected signal in each beam, evaluating equation being: Coeff i ⁡ ( k ) = 1 N ⁢ ∑ n = 1 N ⁢ ⁢  S ~ B ⁢ ⁢ i ⁡ ( n ) ⁢ s * ⁡ ( n )  2 i ( k )=Coeff i ( k )+αCoeff i ( k −1) wherein prefix “*” indicates a complex conjugation calculation, s(n) is the reference signal; N is a total amount of sample points, a product of N with sample time is smaller than coherent time; Coeff i (k) indicates correlation coefficient reflecting the energy of the expected signal energy in an ith beam, obtained by accumulating a kth correlation parameter; and α is a constant; and comparing obtained correlation coefficients Coeff i (k) reflecting the energy of the expected signal in the respective beams to obtain a maximum correlation coefficient Coeff max , and outputting the digital beam output signal S B i (n) corresponding to the maximum correlation coefficient Coeff max .