A kind of variable power/frequency narrowband fsk signal modulation system and method

Abstract

The invention provides a variable-power / frequency narrow-band FSK signal modulation system. The system comprises a saturated amplification and amplitude limiting module, a phase-locked loop frequencydivision module, a pulse signal generation module, a pulse modulation module and a numerical control attenuation module, which are connected in sequence; the saturated amplification and amplitude limiting module is used for performing saturated amplification on an input signal f0; the phase-locked loop frequency division module is used for performing frequency division on the amplified f0, so thatn frequency offsets df1, df2...dfn are obtained and f0-dfn, ..., f0-df2, f0-df1, f0+df1, f0+df2, ..., f0+dfn signals are separately obtained; the pulse signal generation module is used for enabling 2n+1 signals, namely f0-dfn, ..., f0-df2, f0-df1, f0, f0+df1, f0+df2, ..., f0+dfn, to separately pass through 2n+1 wave door switches, outputting 2n+1 pulse signals, then, synthesizing the 2n+1 pulse signals into a signal, and outputting the signal after amplifying; the pulse modulation module is used for amplifying the pulse signal after modulating the pulse signal; and the numerical control attenuation module is used for outputting the signal after performing multi-stage numerical control attenuation.

Description

technical field [0001] The invention belongs to the technical field of microwave signal modulation, in particular to a variable power / frequency narrowband FSK signal modulation system and method. Background technique [0002] In order to complete the function and performance test of radio controllers such as missiles, it is necessary to design a test unit that can replace the function of the irradiation guidance radar in the test equipment, and realize the modulation of the baseband signal (in the form of PAM+FSK) at the sending end to a certain microwave band output. Modulation problem of narrowband FSK uplink signal with variable power / frequency. Its main requirements include: (1) The frequency of several states output by FSK is relatively close, and the isolation is better; (2) The output power is stable within the design frequency range; (3) It has high-precision program-controlled attenuation capability to meet the needs of automatic sensitivity testing. [0003] Based...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiency that existing devices cannot design narrow-band FSK modulation signals, and provide a narrow-band FSK signal modulation system with variable power / frequency. Using this system, 3 states can be provided, namely f0, f0 For the FSK signal of +df and f0-df, the minimum pulse width of the modulated pulse modulation is 0.3μs when the reference frequency is 9~11GHz

Images