Time domain and modulation domain parameter combined measuring method of triangular frequency-modulation pulse signals

Abstract

The invention discloses a time domain and modulation domain parameter combined measuring method of triangular frequency-modulation pulse signals and mainly solves the problems of low parameter accuracy and high operation load in measurement of the triangular frequency-modulation pulse signals in the prior art. The time domain and modulation domain parameter combined measuring method includes steps of 1, acquiring real and imaginary part discrete values of the triangular frequency-modulation pulse signals by a signal analyzer; 2, calculating signal envelopes of the triangular frequency-modulation pulse signals according to the discrete values; 3, estimating the approximate amplitude of the triangular frequency-modulation pulse signals by the signal envelopes; 4, setting a judgment threshold by the approximate amplitude and detecting the number of pulses; 5, calculating the pulse width of each pulse; 6, calculating various time domain parameters by the number of the pulse and the pulse widths; 7, calculating instant frequency of the triangular frequency-modulation pulse signals on the basis of the time domain parameters; 8, calculating various modulation domain parameters of the triangular frequency-modulation pulse signals by the instant frequency. The simulation results indicated that the time domain and modulation domain parameter combined measuring method is low in operation load and higher in accuracy under the condition of high signal to noise ratio as compared with existing methods.

Description

technical field [0001] The invention relates to the field of radar technology, in particular to a method for joint measurement of time domain modulation domain parameters of triangular frequency modulation pulse signals, which can be used in modern radar electronic warfare to measure key information of triangular frequency modulation radar signals. Background technique [0002] Triangular FM pulse signal is a kind of transmission signal often used in modern radar electronic warfare. It has the advantages of insensitivity to Doppler frequency shift and solving the contradiction between signal energy and distance resolution. Measuring the parameters of the triangular FM pulse signal is one of the key points in the field of radar signal processing engineering. Traditional measurement methods only target time domain or modulation domain, and do not combine time domain and modulation domain for parameter measurement. Moreover, time-frequency analysis is required to measure the m...

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Problems solved by technology

STFT has the problem of difficult selection of window length and window function. Due to the use of Fourier transform, the amount of calculation is large, and it is limited by the uncertainty criterion, which cannot solve the contradiction between time resolution and frequency resolution.

Although the Wigner-Vile distribution does not use a window function, there is no STFT problem, but there are "cross-term" interferences in the time-frequency distribution of multi-component signals (such as triangular FM signals), and the time-frequency distribution will become blurred. The frequency estimation Not allowed, and it uses integral calculation, which has a large amount of calculation

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