A s-band low phase noise frequency synthesis generator

Abstract

The invention relates to an S wave band low-phase noise frequency comprehensive generator. According to the S wave band low-phase noise frequency comprehensive generator, a radar system generates four paths of radio-frequency signals and sequential control signals; a high-stability clock source generates two kinds of intermediate frequency signals having difference frequency in the frequency comprehensive generator, the two kinds of intermediate frequency signals are mutually independent and coherent, then three of the four paths of radio-frequency signals are directly output through a first mixer circuit and are the receiving local oscillator signals, the emitting drive signals and the system correction signals used by the radar system, and the emitting drive signals and the system correction signals are generated in the same link, are in a time division relationship during work, and are selected to be output by a microwave switch; the last of the four paths of radio-frequency signals is sampling reference signals used by a signal processor in the radar system and is directly generated by the high-stability clock source in a frequency division mode; the sequential control signals are generated by a control unit. The signals generated by the S wave band low-phase noise frequency comprehensive generator are excellent in quality, and are easy to debug and control.

Description

technical field [0001] The invention relates to a frequency synthesis generator with low phase noise, in particular to a frequency synthesis generator with low phase noise under the S-band FM continuous wave radar system. Background technique [0002] The detection sensitivity of FM CW radar is directly related to the phase noise of the transmitted excitation signal and the received local oscillator signal. [0003] When the radar target echo signal is mixed with the received local oscillator signal, the phase noise of the received local oscillator signal will affect the noise floor of the receiver; while the transmitted signal in FM continuous wave radar will inevitably leak into the receiver, and the transmitted excitation signal The phase noise of the receiver and the mixing product of the received local oscillator signal will also affect the receiver's noise floor. [0004] The detection of the target requires the target echo signal to have a certain signal-to-noise rat...

AI Technical Summary

Problems solved by technology

At present, the circuit architecture commonly used in the design of frequency synthesis generators for this requirement is: DDS + voltage-controlled oscillator + several single-frequency dielectric oscillators in the form of multiple frequency mixing. The circuit form is simple, and the use of filter banks after mixing is very convenient. The signal quality is well guaranteed, but it also brings the problem of large volume and high cost, and the basic waveform circuit of multiple signals is shared, which not only introduces factors that hinder each other when debugging the signal indicators, but also makes the independence of each signal suffer loss

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