Method for suppressing pulse modulation continuous wave interference of notch filter assisted by variable gain amplifier
A technology of gain amplifier and notch filter, which is applied in the anti-jamming field of GNSS receivers, can solve the loss of useful signals, cannot make up for the loss of useful signals, and cannot improve the carrier-to-noise ratio of satellite signals and the decline of receiver correlator output amplitude, etc. Problems, to achieve the effect of improving the tolerance, enhancing the ability to resist suppressive interference, and improving the anti-interference ability of the loop
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[0051] The variable gain amplifier-assisted notch filter pulse modulation continuous wave interference (abbreviated as pulse interference) suppression method disclosed in the present invention can be specifically completed by a software algorithm, and mainly includes a mixed signal amplitude detection module, a notch filter, and carrier stripping. Module, variable gain amplifier, storage module, operation module, estimation module, subtraction module and adaptive mechanism and other program modules.
[0052] The mixed signal of pulse modulation continuous wave interference and GNSS intermediate frequency digital signal is input to the notch filter for filtering; the notch filter outputs the filtered mixed signal, and the filtered mixed signal is input to the carrier stripping module, and the output mixed signal and Mixing result I of a sinusoidal carrier replica signal P (t) and the mixing result Q of the mixed signal and the cosine carrier replica signal P (t); for I P (t) ...
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(t) and Q
(t); performing amplitude detection on the filtered mixed signals, and outputting a corresponding compensation coefficient Gain by the variable gain amplifier according to an amplitude detection result; compensating the mixing result I
(t) to obtain a compensated mixing result I<Pamp>(t); and evaluating and outputting the actual value A(t) of a filtered and compensated signal amplitude according to Q
(t) and I<Pamp>(t). According to the method for suppressing the pulse modulation continuous wave interference ofthe notch filter assisted by the variable gain amplifier, a traditional notch filter is assisted by the variable gain amplifier to achieve effective suppression for pulse modulation continuous wave interference, and can compensate for lost useful signals, which provides a basis for subsequent high-precision tracking and positioning.
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