Miniature airborne up-conversionsystem

Abstract

The invention discloses a miniature airborne up-conversionsystem which is composed of three parts of a local oscillator circuit, a frequency conversion channel circuit and a power control circuit. An output end of the local oscillator circuit and the power control circuit are connected with the frequency conversion channel circuit respectively. According to the miniature airborne up-conversionsystem, a digital phase locking frequency source is directly used and an indirect synthesis method is used, so that stray rejection ratio of local oscillator signals is improved greatly, power dissipation of the whole system is reduced, and the stray output at an L is superior to 78 dBc; meanwhile, broadband phase discrimination is used, phase discrimination frequency is improved, rapid capture broadband is increased, frequency agility time is improved, and problems of miscellaneous inhibition capacity, frequency agility time and the like are solved; a mixer with high compression is used as frequency spectrum flitting, secondary frequency conversion is used, needed broadband signals are produced by the secondary frequency conversion and signals of 960 MHz to 1224 MHz are output by amplification of filtering waves, stray is effectively restrained, and anti-interference capability is enhanced.

Description

technical field [0001] The invention relates to a small airborne up-conversion system. Background technique [0002] There are many ways to achieve frequency hopping oscillation, which can be divided into direct synthesis (crystal oscillator frequency multiplication chain) and indirect synthesis (phase-locked loop) according to the way of realization. When direct synthesis is used, the system is complex in structure, high in cost, low in clutter suppression, difficult to achieve dense jump points, large in working current, and large in size; in indirect synthesis, although the system is simple in structure, high in reliability, low in cost, High wave suppression, easy to achieve dense jump points, small operating current, and small size, but it must be combined with direct synthesis when forming broadband frequency hopping, and the slow frequency hopping speed and poor phase noise are inevitable shortcomings . At present, the frequency hopping speed of the indirect synthes...

AI Technical Summary

Problems solved by technology

It has the advantages of relatively simple system composition, low cost, and small volume. Because it uses indirect synthesis, its clutter suppression is good and the complexity is not high.

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