Broadband linear frequency modulation signal generating device and method
A chirp signal and generating device technology, applied in the direction of electrical components, automatic power control, etc., can solve the problems of limited frequency bandwidth of chirp signal, insufficient signal bandwidth, frequency linearity, poor frequency linearity of chirp signal, etc. Achieve superior broadband performance, good frequency linearity index, and solve the effect of limited bandwidth
Inactive Publication Date: 2020-12-15
AEROSPACE INFORMATION RES INST CAS
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However, factors such as the level of electronic devices and design methods have affected the generation of broadband signals, and there are still deficiencies in signal bandwidth and frequency linearity. The constraints of the generation of broadband chirp signals on high-resolution radars have gradually emerged.
[0003] The current method for generating broadband chirp signals has the following defects: firstly, a voltage-controlled oscillator can be used to generate chirp signals with a wider bandwidth, but the frequency linearity of the chirp signals generated due to the limited precision of the analog control voltage is poor; secondly , the use of DAC and mixer (or frequency multiplier) can generate a chirp signal with high frequency linearity, but considering the spurious deterioration and the generation of new modulation signals, the frequency bandwidth of the chirp signal generated by this method is limited
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[0044] In order to make the purpose, features, and advantages of the application more obvious and understandable, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the drawings in the embodiments of the application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.
[0045] see figure 1 , figure 1 A schematic structural diagram of a broadband chirp signal generating device provided in an embodiment of the present application, the broadband chirp signal generating device includes:
[0046] a clock unit 10, at least one control unit 20, a direct digital frequency synthesizer 30, two phase-locked loops 40, a mixer 50 and a switch 60;
[00...
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The invention provides a broadband linear frequency modulation signal generating device, which comprises a clock unit used for providing a working clock for a control chip and a direct digital frequency synthesizer; at least one control unit for outputting control signals to the direct digital frequency synthesizer, a phase-locked loop and a switch according to a received control instruction; thedirect digital frequency synthesizer for configuring parameters of the direct digital frequency synthesizer according to the control signals and generating and outputting reference signals to the twophase-locked loops; the two phase-locked loops for configuring parameters of the phase-locked loops according to the control signals and generating frequency modulation signals through a phase-lockedtracking technology and the reference signals output by the direct digital frequency synthesizer; a mixer for mixing the frequency modulation signals output by the two phase-locked loops to obtain mixed signals; and a switch for configuring parameters of the switch according to the control signals and modulating the frequency mixing signals to obtain broadband linear frequency modulation signals.
Description
technical field [0001] The present application relates to the technical field of electronic radar, in particular to a broadband chirp signal generating device, method and chip. Background technique [0002] High-resolution radar has good target detection and recognition capabilities, and has been widely used in military fields such as radar imaging, target detection, and target recognition. High-resolution radar is an important direction for the development of future radar systems. As the key technology of high-resolution radar, the generation method of broadband chirp signal has become a research hotspot. However, factors such as the level of electronic devices and design methods have affected the generation of broadband signals, and there are still deficiencies in signal bandwidth and frequency linearity. The constraints of broadband chirp signal generation on high-resolution radars have gradually emerged. [0003] The current method for generating broadband chirp signals...
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IPC IPC(8): H03L7/16H03L7/099
CPCH03L7/16H03L7/099
Inventor 丁满来王雪梅唐跞曲佳萌
Owner AEROSPACE INFORMATION RES INST CAS