Method for measuring delay of direct sequence spread spectrum binary phase shift keying modulator

Abstract

The invention discloses a method for measuring delay of a direct sequence spread spectrum binary phase shift keying modulator. Data despreading and demodulation and delay dependence are taken as cores, the delay measurement of input / output signals with different frequencies and different waveforms of the direct sequence spread spectrum binary phase shift keying modulator is converted into the delay measurement of signals with the same frequency and the same waveform, and is implemented by a created system. Digital signals are divided into two paths by a baseband signal generator (1) through apower divider (2), one path of digital signals pass through a direct sequence spread spectrum binary phase shift keying modulator (3) to be tested and enter a high-speed data acquisition unit (4), and the other path of digital signals are directly output by the power divider (2) to the high-speed data acquisition unit (4). A demodulation module (5) and a dispreading module (6) respectively perform demodulation and despreading processing on the acquired signals, and a delay-dependent module (7) calculates the delay of the two paths of signals. The method ensures that additional delay caused byhardware is not introduced in the measuring process, and can ensure the delay measuring accuracy less than 500ps when the sampling rate is 4GSa / s.

Description

technical field [0001] The invention relates to a method for measuring the delay of a spread spectrum modulator, in particular to a method for measuring the delay of a direct sequence spread spectrum binary phase shift keying modulator. Background technique [0002] With the rapid development of science and technology, the requirements for the accuracy of distance measurement in the fields of satellite positioning, satellite navigation, and aerospace ranging are getting higher and higher. The key to accurate distance measurement is the accurate measurement of time delay. In modern communication systems, in order to achieve anti-noise, anti-interference, secure communication and other purposes, the transceiver equipment usually uses a modulation and demodulation device with a complex modulation system. As a part of the communication link, the modulator has a certain influence on the final measurement result due to its own delay component. Only by accurately measuring the dela...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for measuring the time delay of a direct sequence spread spectrum binary phase shift keying modulator to solve the problem that the existing conventional technology is difficult to accurately measure the time delay of a direct sequence spread spectrum binary phase shift keying modulator

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