Mobile communication teminal and method for calibrating frequency in the same

A mobile communication terminal, automatic frequency calibration technology, applied in the field of calibration frequency, can solve the problem of inaccuracy of predetermined time period, and achieve the effect of shortening time, improving effective accuracy and improving accuracy

Inactive Publication Date: 2003-12-10
LENOVO INNOVATIONS LTD HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the signal sent by the oscillator 201 has an imprecise frequency, the predetermined time period is also inaccurate

Method used

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  • Mobile communication teminal and method for calibrating frequency in the same
  • Mobile communication teminal and method for calibrating frequency in the same
  • Mobile communication teminal and method for calibrating frequency in the same

Examples

Experimental program
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Embodiment Construction

[0059] Figure 6 is a block diagram showing the structure of mobile communication terminal 700 according to the first embodiment of the present invention. The mobile communication terminal 700 is designed to have a network-assisted GPS function in a Personal Digital Cellular (PDC) system.

[0060] The mobile communication terminal 700 includes an automatic frequency calibration (AFC) unit 100, a frequency calibration control (FCC) unit 500 as a GPS module, and a host central processing unit (CPU) that electrically connects the AFC unit 100 and the FCC unit 500 to each other 600.

[0061] In addition to the communication antenna 106 being connected to the down converter 102, the AFC unit 100 has the same figure 1 The AFC unit 100 shown has the same structure.

[0062] While the AFC unit 100 is in the lock condition, the host CPU 600 reads an intermediate frequency (IF) signal count from the AFC circuit 103, converts the thus read count into an FCC actual count offset, and ou...

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PUM

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Abstract

A mobile communication terminal 700 includes an Automatic Frequency Control unit 100 for calibrating frequency, a GPS module 500, and a processor 600 which electrically connects the AFC unit 100 and the GPS module 500 to each other. The AFC unit 100 counts the number of intermediate frequency IF signals generated by converting a frequency of a signal transmitted from a base station. The processor 600 converts the count of the IF signals obtained while the AFC unit 100 is in a lock-up condition into a real count offset. The GPS module 500 counts the number of signals transmitted from a circuit which generates the operational frequency of the mobile device and calibrates the number of signals using the real count offset.

Description

technical field [0001] The invention relates to a mobile communication terminal, such as a cellular phone, which contains a GPS module necessary to generate a precise frequency or to calibrate the frequency to a precise frequency, and to a method for calibrating in such a mobile communication terminal. frequency method. Background technique [0002] Recently, in the field of mobile communication, service providers and service recipients are expecting a service that provides data indicating a user's location. If a user can not only know where he / she is and / or where his / her friends are, but also geographic data such as shops or traffic around the user's location, movies such as the ones the user can watch right now, and movies playing Time-based entertainment-related data and / or traffic-related news can enable a more information-rich society. [0003] One principle of detecting the location of a user or other person is to measure the time it takes for a radio signal to reach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/19G01S19/23H03J1/00H04M1/00H04M1/725H04W64/00
CPCG01S19/235G01S19/256H03J1/0008H03J2200/11
Inventor 北谷谦一
Owner LENOVO INNOVATIONS LTD HONG KONG
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