Automatic spread spectrum capturing performance test circuit

Abstract

The invention provides an automatic spread spectrum capture performance test circuit, aims to provide a test circuit which has high test efficiency, can be used for conveniently debugging and testinga receiver. According to the technical scheme provided by the invention, before test, an upper computer presets all-ones position accuracy and a frequency test expected accuracy to an all-ones test module; the all-ones test module rapidly refreshes a test result once receiving a capture result by taking a signal corresponding to analog source all-ones as a reference signal, and implements automatic statistic on an all-ones position over-proof count, an all-ones position time-out count and an all-ones position total count according to the logic corresponding to spread spectrum capture all-onesand simulation source all-ones, delivering capture results of the all-ones position over-proof count, the all-ones position time-out count and the all-ones position total count, and reporting the capture results to the upper computer for displaying; the frequency test module implements automatic statistic on frequency over-proof count and total count according to the logic corresponding to a capture frequency and a simulation source frequency, and reporting the frequency performance result to the upper computer for display.

Description

technical field [0001] The invention relates to an automatic test circuit for the capture performance of spread spectrum in a spread spectrum receiver in the field of aircraft measurement and control. Background technique [0002] Among the various spread spectrum methods of the prior art spread spectrum communication system, the most widely used is the Direct Sequence Spread Spectrum (Direct Sequence Spread Spectrum, referred to as Direct Spread Technology), for the Direct Sequence Spread Spectrum communication, the capture of the spread spectrum code is a very key Only when the spread spectrum code capture is completed, the system can track the spread spectrum code and demodulate the data. The function of the spread spectrum code capture circuit is to reduce the phase difference between the local spread spectrum code and the received spread spectrum code. to within one spreading code symbol period. In spread spectrum communication, a pseudo-random code (also known as a ps...

AI Technical Summary

Problems solved by technology

At present, in the field of aircraft measurement and control, there is no dedicated hardware circuit for automatic testing of the capture performance. Most of the capture performance tests are still performed manually, and the test results are visually inspected, and it is necessary to capture the frequency performance of the signal during frequency scanning. During the test, the frequency of the signal is constantly changing in real time during the frequency scan. If the frequency performance test is performed by manual single sampling, the efficiency is low, and it is difficult to perform a coverage test on the entire frequency Doppler frequency offset range.

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