Realization method of double-passage real-time relevance machine

Abstract

The invention relates to a realization method of a double-passage real-time relevance machine on an FPGA (field programmable gate array) chip. According to the realization method, a PCI (peripheral component interconnect) local end interface core, a DMA (direct memory access) interface control logic unit, a 16K depth FIFO (first in first out) unit, a DSP (digital signal processor) core, an ADC (analog to digital converter) control logic unit and a clock management unit are adopted, wherein the DSP core comprises the following processing flow processes that ADC sampling data enters a double-passage FFT (fast fourier transform) core after delay compensation and enters a self relevance and mutual relevance operation unit through passage data separation and data cutting, and finally, the ADC sampling data enters an integrator for integration and enters the FIFO unit. Therefore, the signal to noise ratio of the mutual relevance can be improved, meanwhile, much chip resource space is saved, and the high-speed operation is realized.

Description

technical field [0001] The invention relates to the realization of a dual-channel real-time correlator in astronomical measurement. Background technique [0002] The microwave holographic measurement of the aperture surface antenna is mainly to obtain the amplitude and phase distribution of the antenna aperture field by measuring the amplitude and phase of the antenna radiation field in the complex plane, so as to understand the deviation of the antenna surface from the paraboloid. [0003] Usually, the aperture surface antenna is in the shape of a parabola. If it is an ideal parabola, there is a transmitting source at the focus, and the signal is reflected by the parabola, and the wavefront phase value on the aperture plane is equal everywhere (because the optical path distance from the focus to the aperture plane equal). However, in reality, the antenna surface is not a completely ideal parabola, so the phases on the aperture plane must be unequal. In the case of known si...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a solution to the problem that the capacity of the dual-channel real-time correlator is too large and the rate is too slow

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