A method of simulating the dynamic characteristics of a target by incoherent demodulation

Abstract

The invention discloses a method for simulating dynamic characteristics of a target with non-coherent demodulation, aiming at providing a method with the characteristics that the time delay precisionis high, the signal demodulation is not required, and signal motion characteristics can be simulated dynamically with high precision. The invention is realized through the following technical scheme:mixing is carried out with a mixer with a fixed local oscillator after A / D sampling to obtain two low frequency signals of I and Q; a control unit reads the two low frequency signals of I and Q from afirst in first out queue FIFO, calculates orbital data such as the integer time delay, the fractional delay, the carrier Doppler frequency and so on according to the distance and velocity informationof the motion state of the current target, sends the obtained filtering parameters into a poly-phase filter and a re-sampling module, so as to obtain the two baseband data of I and Q after delay adjustment; and an intermediate frequency digital signal is recovered through re-sampling of the re-sampling module and carrier Doppler adjustment; wherein the intermediate frequency digital signal afterthe control unit delay adjustment and the sampling carrier frequency adjustment satisfies the dynamic characteristics of the downlink intermediate frequency measurement and control signal.

Description

technical field [0001] The invention relates to a non-coherent demodulation method, in particular to a method for simulating the dynamic characteristics of a measurement and control signal according to a motion track. Background technique [0002] Whether the measurement and control system is in the process of development or use, it is necessary to have a highly realistic dynamic signal to carry out joint testing and check the state of the equipment, especially in the limit cases where the target distance may be very close or very far, whether the system is normal, especially in the Under the ultra-long distance, whether the baseband distance capture process is normal or not needs to be verified in ordinary experiments to ensure a successful execution of formal tasks; users also need to have a dynamic target environment for daily training. Daily training and maintenance. The existing technology performs dynamic simulation on the measurement and control signal, and usually a...

AI Technical Summary

Problems solved by technology

The minimum register unit of the first-in-first-out queue FIFO register determined by the hardware platform and resources. The frequency of the read and write clock is also limited by the hardware platform and cannot be infinitely increased. Therefore, the delay adjustment accuracy cannot be improved due to the limitation of the hardware platform.

When performing dynamic simulation, dynamic simulation can only be performed according to fixed parameters, and dynamic simulation cannot be performed in real time according to the motion trajectory

The existing dynamic simulation methods have the functional limitations described above, which brings a lot of inconvenience to users and limits the application scenarios

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