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Intermediate frequency combining method suitable for improving sensitivity of ETC antenna

A sensitivity, intermediate frequency technology, applied in antennas, antenna components, circuits, etc., can solve the problems of complex digital phase-locked loop structure, large signal delay, etc., to achieve a stable increase in sensitivity, avoid large delays, and reduce complexity. Effect

Pending Publication Date: 2022-06-24
天津科畅慧通信息技术有限公司
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  • Description
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Problems solved by technology

[0006] At present, the common method to achieve the same phase of the two sequences is to use the digital phase-locked loop technology, but the structure of the digital phase-locked loop is complex, and there is a large delay in the output of the signal

Method used

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  • Intermediate frequency combining method suitable for improving sensitivity of ETC antenna
  • Intermediate frequency combining method suitable for improving sensitivity of ETC antenna
  • Intermediate frequency combining method suitable for improving sensitivity of ETC antenna

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Embodiment 1

[0026] see figure 2 , in the embodiment of the present invention: provide a kind of intermediate frequency combining method suitable for ETC antenna to improve sensitivity, comprise the following steps:

[0027] Step 1): Simultaneously obtain digital intermediate frequency signals from N independent receiving channels of the phased array antenna;

[0028] Step 2): In the digital signal processing module, the delay of the first receiving channel data is fixed, and the delays of other channels are adjusted respectively;

[0029] Step 3): Calculate the correlation coefficient between the adjusted delayed signal sequence and the received signal of the first channel, and take out the sequence with the largest correlation coefficient;

[0030] Step 4): The digital signal of the first channel is directly summed with the sequence with the largest correlation coefficient after the delay of each other channel;

[0031] Step 5): The summed data is used as the input signal of the demod...

Embodiment 2

[0059] According to the description of Embodiment 1, its specific application engineering is as follows:

[0060] Since the period of the digital intermediate frequency signal is M, if the inner product is calculated once per clock delay, the inner product of the two signals needs to be calculated M times; D time delays are extracted at intervals to form D split sequences, so that only D inner products need to be calculated.

[0061] In digital IF, the phase delays of these D split sequences relative to the original sequence are:

[0062]

[0063] Suppose the initial phase of channel 1 is 0°, the initial phase of channel 2 is φ 0 When , the D split sequences must have a phase difference φ with channel 1 that satisfies:

[0064]

[0065] At this time, the multiple of the signal-to-noise ratio after the combination is:

[0066]

[0067] For example: when D=3, k≥1.5=1.76dB has an improvement of at least 1.76dB relative to the theoretical sensitivity.

[0068] For the...

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Abstract

The invention discloses an intermediate frequency combining method suitable for improving sensitivity of an ETC antenna. The method comprises the following steps: simultaneously obtaining digital intermediate frequency signals from N independent receiving channels of a phased-array antenna; in the digital signal processing module, the data delay of the first receiving channel is fixed, and the delays of other channels are respectively adjusted; calculating correlation coefficients of the signal sequence after delay adjustment and the received signal of the first channel, and taking out the sequence with the maximum correlation coefficient; directly summing the digital signal of the first channel with the sequence with the maximum correlation coefficient after the delay of other channels; and the summed data is used as an input signal of the demodulation module, so that the sensitivity is stably improved. According to the invention, the correlation coefficient of the digital signal sequence of each channel is maximized by adjusting the delay of each channel, so that the same or similar phase of each digital signal is realized, and the sensitivity is improved.

Description

technical field [0001] The invention relates to the technical field of ETC phased array antennas, in particular to an intermediate frequency combining method suitable for improving the sensitivity of ETC antennas. Background technique [0002] At present, a large number of ETC phased array antennas are used on the entrance and exit lanes of expressways. When the phased array antenna works in the receiving mode, it needs to simultaneously complete the demodulation of the incoming wave signal and the positioning of the incoming wave direction. [0003] The phased array positioning function is usually accomplished by connecting N antenna arrays with N down-conversion receiving channels, and then converting the samples into digital signals by N ADCs and sending them to the digital signal processing module to complete, such as figure 1 As shown: Since the signals received by these N channels all come from one OBU, but the relative positions of the OBU and each antenna element ar...

Claims

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Application Information

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IPC IPC(8): G07B15/06H04B1/16H01Q1/00
CPCG07B15/06H04B1/16H01Q1/002Y02D30/70
Inventor 吴纯杰王烁廖德福
Owner 天津科畅慧通信息技术有限公司
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