Multichannel positioning system calibrating method

Abstract

The invention relates to a calibration method of a multichannel positioning system, which comprises five operating procedures of calibration channel arrangement, calibration signal sending and receiving, receiving signal treatment, phase deviation and margin deviation judgment and normal receiving; (A) for the calibration channel arrangement procedure, a receiving channel is in a receiving state, and a signal sending machine is switched on; (B) for the calibration signal sending and receiving procedure, the signal sending machine is used for selecting frequency points which have little interference for other devices in the same system, calibration signals are continuously generated, and the continuously sending time takes 10 to 20 baseband sine signals as a cycle; (C) for the receiving signal treatment procedure, a baseband treater carries out margin deviation estimation and phase deviation estimation of received channel data; (D) the phase deviation and the margin deviation are compared with a calibration standard, if the phase deviation and the margin deviation conform to the standard, the calibration is finished, and the normal multichannel receiving is carried out; if the phase deviation and the margin deviation do not conform to the standard, the steps returns to the second procedure to newly carry out the phase calibration and the margin calibration; and (E) the normal multichannel receiving is carried out after the calibration is competed.

Description

technical field [0001] The invention relates to communication receiving technology, in particular to a calibration method for a multi-channel positioning system, which is applicable to any multi-antenna / multi-channel receiving communication system. Background technique [0002] One of the main tasks of multi-channel reception is to realize the estimation of signal space parameters (such as direction of arrival, signal source distance). Taking the estimation of the direction of arrival as an example, such as figure 1 The antenna element shown receives a narrowband signal s from a certain direction i (n), the orientation angle is θ i , if the array element 1 is used as the reference point (referred to as the reference array element), due to the effect of the arrival direction angle, the arrival time of the signal to other array elements is delayed (or ahead) relative to the reference array element, and this delay causes other array elements There is a difference in the phas...

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Problems solved by technology

[0006] In order to ensure the accuracy of the measurement, different array elements are required to have the same amplitude and phase response in the process from antenna reception to baseband processing. However, in the actual system, since different array elements pass through different receiving channels, they are independent of each other. As the surrounding environment changes, it is difficult to guarantee the same amplitude and phase gain between different receiving channels. If there are differences between them, these differences will seriously affect the accuracy of signal space parameter estimation.

[0007] In view of the fact that in a multi-channel receiving system (such as MIMO, smart antenna), the receiver may need to use different channels to receive signals to measure signal space parameters such as signal arrival angle, distance, and multi-channel correlation. Independent of each other, there will be inherent differences in amplitude and phase between different channels, and these differences will seriously affect the accuracy of the measurement of the above-mentioned multiple signal space parameters

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