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GSM signal frequency point detection method and device thereof

A detection method and frequency point technology, applied in security devices, wireless communication, transmission monitoring, etc., to achieve the effect of improving flexibility and compatibility, ensuring accuracy and speed

Inactive Publication Date: 2011-06-15
深圳国人射频通信有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mix the GSM signal with a changing frequency signal, and then use the insertion loss of the IF filter to detect the frequency of the GSM signal. There is no relevant literature disclosure at present.

Method used

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  • GSM signal frequency point detection method and device thereof
  • GSM signal frequency point detection method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Detection of DCS1800M downlink signal frequency points

[0032] According to the requirements of the GSM protocol, the first frequency point of DCS1800M downlink signal is 1805.2MHz, the last frequency point is 1879.8MHz, and other frequency points are: 1805.2+N*0.2MHz, where N is an integer between 1-374. Since the GSM frequency interval is 200KHz, the 3dB bandwidth of the IF filter is designed to be 200KHz or 250KHz, and the center frequency of the IF filter is f 中 Can be designed as 180MHz, 240MHz, etc., at its center frequency f 中 ±200KHZ requires a certain suppression index. therefore,

[0033] Set the lower limit frequency of the scanning frequency range: 1805.2+f 中 (in MHz)

[0034] Set the upper limit frequency of the scanning frequency range: 1879.8+f 中 (in MHz)

[0035] based on figure 1 The detection process of the DCS1800M downlink signal frequency of the device is as follows:

[0036] 1), the control calculation unit changes the frequen...

Embodiment 2

[0039] Example 2: Detection of EGSM900M downlink signal frequency points

[0040] According to the requirements of the GSM protocol, the first frequency point of the EGSM900M downlink signal is 925.2MHz, the last frequency point is 959.8MHz, and the other frequency points are: 925.2+N*0.2MHZ, where N is an integer between 1-174. Since the GSM frequency interval is 200KHZ, the 3dB bandwidth of our IF filter can be designed as 180KHz, 200KHz or 220KHz, and the center frequency of the IF filter is f 中 Can be designed as 180MHz, 211MHz, 336MHz, etc., at its center frequency f 中 A certain suppression index is required at ±200KHz. therefore,

[0041] Set the lower limit frequency of the sweep frequency range as: 925.2+f 中 (unit MHz)

[0042] Set the upper limit frequency of the sweep frequency range as: 959.8+f 中 (unit MHz)

[0043] The detection process of the EGSM900M downlink signal frequency point of the embodiment 2 is as follows:

[0044] 1), control the calculation unit ...

Embodiment 3

[0048] Embodiment 3: Detection of EGSM900M Downlink Signal Frequency Points

[0049] According to the requirements of the GSM protocol, the first frequency point of the EGSM900M downlink signal is 925.2MHz, the last frequency point is 959,8MHz, and the other frequency points are: 925.2+N*0.2MHZ, where N is an integer between 1-174. Since the GSM frequency interval is 200KHz, the 3dB bandwidth of our IF filter can be 200KHz, or 140KHz, etc. The center frequency of the IF filter is f 中 Can be designed as 180MHz, 211MHz, 336MHz, etc., at its center frequency f 中 A certain suppression index is required at ±200KHz. Because the mixer of Embodiment 3 adopts the down-conversion method, therefore,

[0050] Set the lower limit frequency of the sweep frequency range as: 925.2-f 中 (unit MHz)

[0051] Set the upper limit frequency of the scanning frequency range as: 959.8-f 中 (unit MHz)

[0052] The detection process of the frequency point of the EGSM900M downlink signal in this embo...

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Abstract

The invention discloses a method for detecting GSM signal frequency points, which comprises the following steps: the frequency of a frequency generator is set by a control calculation unit in a stepping way based on a fixed offset within a set scanning frequency range, the GSM signal detected is mixed with the frequency signal of the generator when the frequency is changed for once, and then an intermediate frequency signal is generated and sent into an intermediate frequency filter for filtration; the insertion loss for once of the intermediate frequency filter is detected by a power detecting unit, all the obtained insertion loss values of the intermediate frequency filter are sequenced, a minimum insertion loss value and the frequency corresponding to the minimum insertion loss value are found out, and then the center frequency of the intermediate frequency filter is deducted from or added to the frequency corresponding to the minimum insertion loss value so as to obtain the frequency point of the GSM signal detected. The GSM signal is mixed with a variable frequency signal and the insertion loss of the intermediate frequency filter is skillfully used for detecting the frequency of the GSM signal, having no influence of the variation of the power of the GSM signal as time passes by, thereby guaranteeing the accuracy and speed of detection.

Description

technical field [0001] The invention belongs to the technical field of signal frequency point detection in GSM communication systems, in particular to a GSM signal frequency point detection method and a detection device, which are suitable for fast and accurate detection of input signal frequency points by BTS (base transceiver station) peripheral equipment . Background technique [0002] At present, most BTS peripheral devices obtain the frequency point information of their signals by communicating with the BTS, while communicating with the BTS requires physical interfaces and communication protocols, which limits the flexibility and compatibility of the peripheral devices. increase cost. [0003] With the rapid development of GSM communication technology, accurate and fast detection of its signal frequency is essential. The scheme of mixing the GSM signal with a changing frequency signal and then using the insertion loss of the intermediate frequency filter to detect the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/00H04W12/02H04W24/02H04B17/30
Inventor 田辉群吴秋元
Owner 深圳国人射频通信有限公司
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