Frequency synthesizer for generating Ka-waveband FM linear continuous wave and operating method thereof
A frequency synthesizer and digital frequency synthesis technology, applied in instruments, radio wave measurement systems, etc., can solve the problems of low linearity of FM continuous wave SAR signals, and achieve the effects of avoiding nonlinear deterioration, easy implementation and simple design.
Active Publication Date: 2016-09-28
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology
[0005] The problem solved by the present invention is that in the prior art, the linearity of the FM continuous wave SAR signal is low; in order to solve the problem, the present invention provides a frequency synthesizer and its working method for generating the Ka band FM linear continuous wave signal, using The millimeter-wave FMCWSAR echo receiving system of the frequency synthesizer that produces the Ka-band FM linear continuous wave signal
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[0017] Hereinafter, the present invention will be further described in conjunction with the drawings and embodiments.
[0018] Such as figure 2 As shown, the frequency synthesizer for generating the Ka-band FM linear continuous wave signal provided by the present invention includes: crystal oscillator 1, direct digital frequency synthesis unit 2, PDRO 4, first power division 3, second power division 5, first stage upper Frequency conversion unit 6, second-stage up-conversion unit 7, frequency multiplication unit 9; the crystal oscillator 1 is connected to the input terminal of the first power division 3, and the output terminal of the first power division 3 is connected to the input of the direct digital frequency synthesis unit 2 terminal, the input end of PDRO4, the output end of PDRO4 is connected with the input end of the second power division 5, and the output end of the second power division 5 is connected with the input end of the frequency multiplication unit 9 and th...
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Abstract
The invention discloses a frequency synthesizer for generating a Ka-waveband FM linear continuous wave and an operating method thereof, wherein a millimeter wave FMCWSAR echo receiving system of the frequency synthesizer is adopted. The frequency synthesizer comprises the components of a crystal oscillator, a direct digital frequency synthesizing unit, a PDRO, a first power divider, a second power divider, a first-stage up conversion unit, a second-stage up conversion unit and a frequency multiplication unit. The crystal oscillator is connected with the first power divider. The output end of the first power divider is connected with the input end of the direct digital frequency synthesizing unit and the input end of the PDRO. The output end of the PDRO is connected with the input end of the second power divider. The output end of the second power divider is connected with the input end of the frequency multiplication unit and the input end of the first-stage up conversion unit. The output end of the frequency multiplication unit is connected with the input end of the second-stage up conversion unit. The output end of the direct digital frequency synthesizing unit is connected with the input end of the first-stage up conversion unit. The output end of the first-stage up conversion unit is connected with the input end of the second-stage up conversion unit.
Description
technical field [0001] The present invention relates to unmanned aerial vehicle-borne millimeter-wave FMCWSAR, particularly relate to the frequency synthesizer that produces Ka-band frequency-modulated linear continuous wave signal and its working method, adopts the millimeter-wave FMCWSAR feedback of the frequency synthesizer that produces Ka-band frequency-modulated linear continuous wave signal wave receiving system. Background technique [0002] Due to institutional reasons, pulse system SAR system equipment is complex, heavy, bulky, and expensive, and is not suitable for installation on small UAVs. The special system of frequency modulated continuous wave SAR (FMCWSAR) determines that there is no need to use a large transmit peak power, and the system equipment is simple. complexity and power levels. However, the frequency sweep nonlinearity of FM CW SAR signals will seriously affect the imaging dimension resolution. [0003] In the detuned receiving mode, the non-...
Claims
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Login to View More IPC IPC(8): G01S7/282
CPCG01S7/282
Inventor 王树文蔡昆崔永香刘庆波唐侃
Owner SHANGHAI RADIO EQUIP RES INST