Ultra-wideband quick frequency conversion source

Abstract

The invention discloses a super broad band rapid frequency conversion, which comprises a control unit, a DDS unit, a cent unit, a double frequency unit A, a double frequency unit B and a frequency choosing unit. When in reference, the 1GHz DDS time signal is obtained through a PLL lock phase; the DDS unit is driven to produce a 0 to 400MHz signal to be divided into three ways to send to the double frequency unit A, the double frequency unit B and the frequency choosing unit. An output signal of the double frequency unit A and the double frequency unit B are also sent to the frequency choosing unit and finally the frequency choosing unit outputs a final frequency signal. The invention doubles frequency of the signal output by the DDS, and conducts choosing output, which realizes super broad band rapid frequency, with short frequency conversion response time(less than 200ns). The frequency speed reaches nanosecond grade, the output frequency range to more than 1 GHz and the frequency differentiate rate less than 0.01Hz. Under the worst condition, the scattering and harmonic wave is less than -55dBc, noise less than -95dBc / Hz at 1KHz, -105dBc / Hz at 10KHz, with simple periphery control joint and convenient utilization.

Description

technical field [0001] The invention relates to a signal source suitable for various wide-band radars such as frequency-agile system radar, RCS test and imaging radar, and specifically refers to an ultra-wideband fast-change frequency source. Background technique [0002] In recent years, more and more attention has been paid to various broadband radars such as frequency-agile system radars, RCS test and imaging radars. It has been widely used in military and civilian fields such as remote sensing and obstacle avoidance. Radars of various systems have also been put into use. For example, the commonly used frequency agility system has been applied in various types of missiles as a missile terminal guidance and anti-jamming technology, and RCS test radar has been applied many years ago. It has made great contributions to the stealth design of weapons in our country. [0003] Frequency-agile radars and RCS test and imaging radars are all broadband radars, and the signal bandw...

AI Technical Summary

Problems solved by technology

These three methods have their own advantages and disadvantages. The frequency conversion time of direct frequency synthesis technology is short, but the structure is complex, and the output frequency range is limited, and the number of discrete frequencies cannot be too many; the phase-locked frequency synthesis technology has high output spectrum purity, but its frequency conversion time Longer, frequency resolution is also limited; DDS technology has the advantages of high frequency resolution, fast frequency switching, low phase noise, high frequency stability, etc., but the output signal bandwidth is limited

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