An automatic multi-channel multi-frequency field strength measurement device and measurement method

Abstract

The invention discloses an automatic multi-channel multi-frequency field strength measuring device and a measuring method. The device includes a plurality of receiving antennas and analog signal processing units respectively connected to the receiving antennas, a distance measurement module, a digital signal processing unit and a host computer; all Both the analog signal processing unit and the distance measurement module are connected to the digital signal processing unit, and the digital signal processing unit is connected to the upper computer. The invention is designed with multiple receiving channels, and can freely configure the local oscillator source in the analog signal processing unit to realize the reception of different transmission channels and different transmission frequencies of the ground base station, adapt to the MIMO system adopted by the vehicle-ground communication system, and be able to Freely switch between distance trigger mode and time trigger mode to realize efficient measurement of track lines.

Description

technical field [0001] The invention belongs to the technical field of rail traffic measurement, mainly aims at the problem of field strength measurement of a maglev rail transport vehicle-ground communication system, and particularly relates to an automatic multi-channel multi-frequency field strength measurement device and measurement method. Background technique [0002] With the rapid development of wireless communication technology, wireless communication technology is applied in all aspects of life. In order to ensure the reliability of communication, we need to use some indicators to quantify the quality of the signal to confirm the security and reliability of wireless communication. Field strength is one of the most important indicators. It measures the magnitude of the electrical signal induced by the antenna at a certain point in space to characterize the electric field strength at that point, which can reflect the quality of the signal to a certain extent. [0003...

AI Technical Summary

Problems solved by technology

In the design, the vehicle-to-ground communication system of the maglev train can measure the field strength itself, but the train cannot run without confirming that the entire track has covered the signal

This creates a contradiction. The train can monitor the field strength signal, but the train cannot run if the signal coverage cannot be confirmed. Therefore, a set of devices is needed to measure the field strength of the track before the train runs to confirm the complex environment. The impact of multipath problems and whether the main lobe of the antenna covers the track, and confirm that the train can communicate normally at any position on the track

[0006] There are two main problems in testing the signal quality of the high-speed maglev vehicle ground communication system: the correlation between field strength and track position; the problem of efficient multi-channel and multi-frequency field strength measurement

[0008] (1) Add a GPS module to the commercial field strength meter to realize automatic measurement, but the GPS positioning cannot meet the high-precision requirements

[0009] (2) Fixed-point sampling measurement, measuring the field strength of the position at intervals on the track, and recording the data at these positions, this measurement method is extremely inefficient, especially when the distance of the track is long, the required time and High labor cost

[0010] For the efficient measurement of multi-channel and multi-frequency field strength, the current field strength test generally uses single-antenna measurement, which cannot realize multi-channel and multi-frequency simultaneous measurement

like figure 1 The communication system of the high-speed maglev vehicle shown in the figure adopts the MIMO system to ensure the reliability of communication, and uses multi-channel and multi-frequency transceivers to solve the problem of rapid signal fading in complex environments. If the traditional single-frequency single-channel field strength test method is used for multiple time switching test, the required time and labor cost will be further increased

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