C-waveband frequency comprehensive generator with low phase noise

Abstract

The invention discloses a C-waveband frequency comprehensive generator with low phase noise and wide frequency agility. The generator comprises a 100 MHz of constant-temperature crystal oscillator, a power divider, a frequency tripler, a P-waveband phase locked loop, a C-waveband sampling phase locked medium oscillator, a mixer, a filter, a programmable logic device, a digital frequency direct synthesizer and a frequency divider. The generator disclosed by the invention has the characteristics that: the digital frequency synthesizer (DDS) is rationally utilized; the radar emission waveform iseasy to generate; the digital phase locked circuit is simple; the frequency change is convenient; the remote end of the sampling phase locked medium oscillator has excellent phase noise; the shortcomings are mutually made up; the circuit structure is simple; the phase noise is good; the radar waveform is convenient to change; furthermore, the frequency agility is rapid to carry out.

Description

technical field [0001] The invention relates to a low phase noise frequency synthesis generator, in particular to a C-band low phase noise frequency synthesis generator. Background technique [0002] The frequency synthesis generator is the core component of the radar. It generates various frequency components required by the radar. The index of the frequency synthesis generator is also a key index of the radar. The phase noise of the frequency synthesis generator directly affects the detection sensitivity of the radar; the short-term stability directly affects the improvement factor of the radar. Since the radar electronic countermeasure function needs variable frequency, the transmission signal output by the frequency synthesis generator is required to work in a relatively wide bandwidth. It is necessary to ensure the low phase noise of the transmission signal and to perform frequency agility within a certain range. It is a very difficult thing to balance. Contents of t...

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Problems solved by technology

Since the radar electronic countermeasure function needs variable frequency, the transmission signal output by the frequency synthesis generator is required to work in a relatively wide bandwidth. It is necessary to ensure the low phase noise of the transmission signal and to perform frequency agility within a certain range. It is very difficult to balance

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