KR19990071026A - Device for improving the reception performance of GPS - Google Patents

Abstract

The present invention relates to a device for improving the reception performance of a WPS, and in particular, by down-converting a reception frequency received from an antenna to facilitate demodulation, the clock and down-converted signals are divided and multiplied by a correlator. A receiving unit for applying; A correlator for demodulating data using a clock and a signal applied by the receiver, or extracting information transmitted from a satellite by tracking a signal; A central processing unit which receives data extracted from the correlator and processes information; A temperature sensor for sensing a temperature of the oscillator to generate a constant clock signal; A signal converter for amplifying the analog signal applied from the temperature sensor and converting the analog signal into a digital signal; A complex program logic device for converting a signal applied from the signal conversion unit into a suitable signal for applying to a central processing unit, or for applying a correction signal applied from the central processing unit to an offset correction unit; An offset correction unit for correcting a clock signal generated by an oscillator using a signal applied from the complex program logic device; Apparatus for improving the reception performance of the PSPS, characterized in that it comprises an oscillator for generating a clock required for the receiver, the present invention has the effect of improving the performance of the overall system.

Description

Device for improving the receiving performance of the GPS

The present invention provides a GPS (Global Positioning System) engine board that receives a signal from a satellite by code division multiple access method (CDMA) and converts it into information (position, time and speed information) that can be used by a general user. In particular, the use of pulses of the oscillator for signal processing such as down-conversion of the received frequency signal received from the antenna, input of the correlator, clock, etc., causes errors due to temperature changes and affects the performance of the system. By adding a digital thermometer to the oscillator to correct the temperature, the present invention relates to a device for improving the reception performance of the GPS, which generates an accurate clock of a precise and constant period regardless of the influence of temperature.

Conventionally, the influence of temperature is reduced by using TCXO (TEMPERATURE COMPENSATDE CRYSTAL OSCILLATOR). However, this also has a problem that it is difficult to obtain good performance at any extreme temperature because the operating point (OPERATING POINT) showing good characteristics is determined according to the specification of TCXO.

An object of the present invention is to solve the above problems, in particular, by sensing the temperature of the oscillator using a temperature sensor, amplifying the analog signal detected by the temperature sensor, converting the digital signal into a central processing unit By improving the clock and pulse generated by the oscillator in comparison with the control signal generated by the system, a device for improving the reception performance of the GPS, which can generate a precise and constant cycle clock regardless of the temperature influence. To provide.

In order to achieve the above object, the apparatus for improving the reception performance of the GPS of the present invention is to down-convert the reception frequency received from the antenna to facilitate demodulation. A receiver for applying a down-converted signal; A correlator for demodulating data using a clock and a signal applied by the receiver, or extracting information transmitted from a satellite by tracking a signal; A central processing unit which receives data extracted from the correlator and processes information (position data, velocity data, visual data, etc.); A temperature sensor for sensing a temperature of the oscillator to generate a constant clock signal; A signal converter for amplifying the analog signal applied from the temperature sensor and converting the analog signal into a digital signal; A complex program logic device for converting a signal applied from the signal conversion unit into a suitable signal for applying to a central processing unit, or for applying a correction signal applied from the central processing unit to an offset correction unit; An offset correction unit for correcting a clock signal generated by an oscillator using a signal applied from the complex program logic device; The technical configuration is characterized by including an oscillator for generating a clock required for the receiver.

1 is a schematic block diagram of an apparatus for improving the reception performance of the present invention,

Explanation of symbols for the main parts of the drawings

100: receiver 200: correlator

300: central processing unit 400: temperature sensor

500: signal conversion unit 600: complex program logic device

700: offset correction 800: oscillator

Hereinafter, with reference to the accompanying drawings for an embodiment according to the technical idea of the device for improving the reception performance of the present invention WPS configured as described above are as follows.

Example

As shown in FIG. 1, the receiver 100 down-converts a reception frequency received from an antenna to facilitate demodulation. The receiver 100 divides and multiplies the clock input from the oscillator 700 to clock and correlate the correlator 200. The down-converted signal is applied, and the correlator 200 demodulates the data by using the clock and the signal applied from the receiver 100, or extracts various information sent from the satellite by tracking the signal to the central processing unit 300. The central processing unit 300 receives the information data extracted from the correlator 200 to process position data, speed data, time data, and the like, and does not harmonize the information data with the clock signal. In this case, the correction signal of the clock signal is applied to the complex program logic device.

The temperature sensor 400 detects the temperature of the oscillator 700 and applies it to the signal conversion unit 500 so as to generate a constant clock signal, and the signal conversion unit 500 applies the analog signal applied from the temperature sensor 400. Amplify and convert the signal into a digital signal and apply it to the complex program logic device 600, and the complex program logic device 600 applies the signal applied from the signal converter 500 to the central processing unit 300. The correction signal is converted into a suitable signal or the correction signal applied from the central processing unit 300 is applied to the offset corrector 800, and the offset correction unit 700 applies the correction signal applied from the complex program logic device 600. By correcting the clock signal generated by the oscillator 800 by using the retransmission to the receiver 100, the oscillator 800 generates a clock required for the receiver 100 by applying to the offset corrector 700 By the way, this embodiment is constituted.

Hereinafter, the operation of the present embodiment configured as described above will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 1, when information data is input from the satellite through the receiver 100, the oscillator 800 generates a clock signal suitable for the information data in order to detect the information data.

The clock signal generated by the oscillator 800 is applied to the receiver 100 through the calibrator 700, and the receiver 100 receiving the clock signal from the oscillator 800 demodulates the frequency signal received by the antenna. It is converted to easily and applied to the correlator 200, the correlator 200 receives a signal from the receiver 100 demodulates the information data using a clock signal and a signal or tracks the information to send the information data from the satellite Extract the information about and apply to the central processing unit (300).

The central processing unit 300, which receives the information on the information data from the correlator 200, processes the position data, the speed data, and the time data based on the information data, and the timing of the information data and the clock signal is appropriate. If it is not done, the clock signal correction signal is applied to the complex program logic device 600, and the complex program logic device 600 receiving the correction signal for the clock signal from the central processing unit 300 is offset offset. The correction signal for the clock signal is applied to the government 700.

In this case, the complex program logic device 600 does not randomly send a calibration signal to the offset calibration unit 700, but periodically checks the temperature of the oscillator 800 by the temperature sensor 400 to the temperature of the oscillator 800. Correct the clock signal accordingly.

If you look at the signal processing process for correcting the clock signal by sensing the temperature of the oscillator 800 for a while, first, the temperature sensor 400 periodically checks the temperature of the oscillator 800 to be applied to the signal conversion unit 500 When the signal converter 500 amplifies an analog signal, converts it into a digital signal, and applies it to the complex program logic device 600. The complex program logic device 600 receiving the signal from the signal converter 500 is The signal is converted into a signal suitable for processing in the central processing unit 300 and applied to the central processing unit 300.

The central processing unit 300 then retransmits the signal to the complex program logic device 600 when a situation occurs in which the clock signal needs to be corrected by processing the received signal, and the complex program retransmitted the signal from the central processing unit 300. The logic device 600 applies a correction signal to the offset corrector 800 to correct the clock signal, and the offset corrector 700 uses an oscillator using the correction signal applied from the complex program logic device 600. The clock signal generated at 800 is corrected and retransmitted to the receiver 100.

As described above, in the apparatus for improving the reception performance of the present invention, in particular, an error occurs in demodulating data input through the receiver as the clock signal changes according to the temperature of the oscillator. By checking the temperature of the oscillator and correcting the clock signal as much as the oscillator's changed temperature to prevent it, it is possible to use the satellite receiver in the environment where the temperature change is large by improving the overall system performance and improving the overall system performance. It works.

Claims (3)

A receiving unit which down-converts the reception frequency received from the antenna to easily demodulate and divides and multiplies the clock input from the oscillator to apply a clock and down-converted signal to the correlator; A correlator for demodulating data using a clock and a signal applied by the receiver, or extracting information transmitted from a satellite by tracking a signal; A central processing unit which receives data extracted from the correlator and processes information (position data, velocity data, visual data, etc.); A temperature sensor for sensing a temperature of the oscillator to generate a constant clock signal; A signal converter for amplifying the analog signal applied from the temperature sensor and converting the analog signal into a digital signal; A complex program logic device for converting a signal applied from the signal conversion unit into a suitable signal for applying to a central processing unit, or for applying a correction signal applied from the central processing unit to an offset correction unit; An offset correction unit for correcting a clock signal generated by an oscillator using a signal applied from the complex program logic device; And an oscillator for generating a clock required for the reception unit. The method of claim 1, wherein the complex program logic device obtains a stable clock by applying a temperature of an oscillator obtained from a temperature sensor to a central processing unit in real time, and applying a correction signal obtained from the central processing unit to an offset correction unit. Device for improving the reception performance of the PSS. 2. The method of claim 1, wherein the offset correction unit compares a clock signal applied by the oscillator with a correction signal applied from the complex program logic device to adjust the clock signal generated by the oscillator according to the correction signal sent from the complex program logic device. Device for improving the reception performance of the GPS, characterized in that a stable system can be implemented by the correction.