Method for detecting deterioration degree of BER performance of BPSK satellite communication systems

Abstract

The invention discloses a method for detecting deterioration degree of BER (bit error rate) performance of BPSK satellite communication systems. The method comprises: calculating the BER of a BPSK satellite communication system under single-frequency interference or not under single-frequency interference respectively; calculating the amount of BER performance deterioration of the BPSK satellite communication system under single-frequency interference according to the BER of the BPSK satellite communication system under single-frequency interference or not under single-frequency interference;and comparing the amount of BER performance deterioration with a preset threshold value of the amount of BER performance deterioration and judging the BER performance to be severely deteriorative if the amount of BER performance deterioration is greater than the threshold value. Due to the invention, the prior method for detecting the BER performance deterioration of BPSK satellite communication systems under single-frequency interference is perfected and improved, and an accurate detection method with generality and practicability is provided. In addition, the method of the invention has theadvantages of more rigorous analysis, more accurate and credible result and better practicability.

Description

technical field [0001] The invention relates to the technical field of bit error performance detection of satellite communication systems, in particular to a method for detecting the deterioration degree of bit error performance of a binary phase shift keying (BPSK) satellite communication system under the condition of single-frequency interference. Background technique [0002] The impact of single-carrier interference on the deterioration of bit error performance of satellite communication systems using BPSK modulation is generally reflected in two aspects: the deterioration of carrier tracking performance and the deterioration of detection and judgment performance. The impact is mainly reflected in the deterioration of detection and decision performance. [0003] Existing detection methods for the deterioration of bit error performance of BPSK satellite communication systems are mainly divided into three categories: the first category is to convert single-frequency interf...

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Problems solved by technology

[0003] Existing detection methods for the deterioration of bit error performance in BPSK satellite communication systems are mainly divided into three categories: the first category is to convert single-frequency interference into an equivalent noise component in the receiving frequency band, and then detect the equivalent noise component analysis; the second category distinguishes single-frequency interference from receiving noise, but detects the phase of single-frequency interference as a definite quantity; although the third category introduces the interference phase as a random quantity into the detection analysis, it only gives Qualitative analysis results, no quantitative detection method

[0004] The above three types of methods all have different degrees of defects, which will directly lead to deviations or even errors in the test results, which will affect the anti-interference design analysis in engineering applications.

First of all, there are theoretical loopholes in the first method. The calculation formula of the bit error rate when there is no interference in the BPSK communication system is the statistical analysis result obtained when the system noise satisfies the Gaussian distribution. After the single-frequency interference is equivalent to the noise component, the system The noise does not satisfy the Gaussian distribution, so the original bit error rate calculation formula is not rigorous in theory

Secondly, the second type of method is only suitable for communication systems where the distance between the interference and the receiving end is constant, and the signal transmission distance in the satellite communication system is constantly changing, which will cause the phase of the interfering signal to change constantly, so the phase of the single-frequency signal is used as Analytical methods for determining values ​​are clearly not general

Finally, the third type of method does not provide a quantitative detection method, which is not practical in engineering practice

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