METHOD FOR TRACKING A CRUISE MISSILE WHEN ROUNDING THE TERRAIN IN VARIOUS TACTICAL SITUATIONS Russian patent published in 2021 - IPC G01S13/52 G01S13/58 G01S13/72 

FIELD: digital signal processing.

SUBSTANCE: proposed invention relates to the field of digital signal processing and can be used in tracking systems for mobile objects and missile guidance systems for tracking a cruise missile (CM) and recognizing a variant of a tactical situation, including a variant of the missile flight path with a terrain rounding, a variant of the nature of the flight (maneuver intensity) of the missile and a variant of the interference situation. The method consists in the simultaneous formation of reliable unconditional estimates of the phase coordinates of the relative movement of the missile and the radar carrier (or RHH) and the assessment of the tactical situation variant. The method combines radar (or RHH) information and the tactical situation variant indicator, takes into account a priori data on the dynamics of the missile trajectory parameters and the change of the tactical situation variant, adapts the information processing system to them and takes into account alternative models of the rocket movement and measurements of its trajectory parameters, updated on the basis of a digital terrain map (DTM). Based on the narrow-band Doppler filtering of the signal reflected from the rocket body in the radar (or RHH), a Doppler frequency count with the maximum amplitude of the components of the received signal spectrum is formed according to the fast Fourier transform (FFT) procedure, and it is converted into a velocity value. Next, the generated velocity values and output readings of the rangefinder, accelerometer and indicator are processed in a multi-channel filter according to the procedure of joint filtering of phase coordinates and recognition of the state of the Markov structure of a linear stochastic dynamic system based on a two-staged parametric approximation (TPA) by a normal law based on a priori data in the form of a mathematical model (MM) of the system “radar carrier (or RHH) - cruise missile-radar (or RHH) - complex indicator” with a random jump-like structure (RJS), including linear alternative models of the evolution of the trajectory parameters of the rocket movement refined on the basis of the DTM, linear alternative models of measurements of these parameters in the radar (or RHH), a complex Markov model of changing the tactical situation variant (changing the state of the structure) refined on the basis of the DTM, a complex Markov model of the tactical situation variant indicator, alternative models of uncontrolled random disturbances and interference, under initial conditions. At the output of the filter, estimates of the tactical situation variant, the unconditional mathematical expectation (ME) of the trajectory parameters and the covariance matrix (CM) of their estimation errors are formed.

EFFECT: expansion of the functionality of radar stations (radars) and radar homing heads (RHH) for tracking the radar and recognizing a variant of the tactical situation, increasing the reliability and stability of filtering the trajectory parameters of the movement of the radar relative to the radar (or RHH) and recognizing a variant of the tactical situation.

1 cl, 1 dwg