A Carrier Suppression Measurement Method for Short Burst Spread Spectrum Signals

Abstract

The invention discloses a method for measuring the carrier suppression degree of a short burst spread spectrum signal. The method includes: 1. Taking the time-frequency signal of a time-frequency reference source as a reference, and constructing a navigation user terminal test platform under laboratory conditions; 2. The test control and evaluation software controls the satellite navigation signal simulator to broadcast the outbound navigation signal; 3. The navigation user terminal receives the outbound navigation signal broadcast by the satellite navigation signal simulator, and sends the inbound short burst under the control of the test control and evaluation software Send spread spectrum signals; 4. The inbound signal receiver captures, tracks and demodulates the short burst spread spectrum signals transmitted by the navigation user terminal, and obtains useful signals and The power of the carrier is leaked, so as to obtain the measured value of the carrier suppression degree of the short burst spread spectrum signal. The invention can realize the measurement of the carrier suppression degree of the inbound short burst spread spectrum signal, and has the advantages of low cost, simplicity and practicability.

Description

technical field [0001] The invention relates to the technical field of satellite navigation user equipment testing, in particular to a method for measuring the carrier suppression degree of short burst spread spectrum signals. Background technique [0002] The navigation user equipment test platform is used to test and evaluate the functional performance of various navigation user terminals including the first phase of Beidou-2 under laboratory conditions. At present, vector signal analyzers are generally used to measure the carrier suppression degree of the inbound short burst spread spectrum signal transmitted by the navigation user terminal. Because the power of the inbound signal transmitted by the navigation user terminal is small and the time is short, the navigation terminal The measured value of the carrier suppression degree of the transmitted signal has large jitter and low precision. At the same time, due to the use of a vector signal analyzer for measurement, th...

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Problems solved by technology

[0003] The purpose of the present invention is: aiming at the shortcomings of high hardware cost and low measurement accuracy of the traditional method of measuring the carrier suppression degree of short burst spread spectrum signal by vector signal analyzer, a kind of carrier suppression degree measurement of short burst spread spectrum signal is designed method, which effectively solves the problem of carrier suppression degree measurement for short burst inbound spread spectrum signals in the navigation user terminal test platform

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