Automated Spread Spectrum Capture Performance Test Circuit

Abstract

The invention proposes an automatic spread spectrum capture performance test circuit, aiming to provide a test circuit with high test efficiency and convenient debugging and test for receivers. The present invention is realized through the following technical scheme: before the test, the host computer presets the expected accuracy of the all-1 position and frequency test to the all-1 test module; the all-1 test module uses the analog source all-1 corresponding signal as a reference signal, and receives When the capture result is detected, the test result will be refreshed immediately, and the corresponding logic of all 1s captured by spread spectrum and all 1s of the analog source will be automatically counted, and the all 1 position exceeding standard, timeout and total count will be counted, and the all 1 exceeding count, all 1 timeout count and all 1 total count will be captured The results are sent out and reported to the host computer for display; the frequency test module automatically counts the frequency exceeding the standard and the total count in real time according to the corresponding logic of the captured frequency and the analog source frequency, and reports the frequency performance results to the host 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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