KR101012176B1 - Global navigation satellite system receiver considering high sensitivity and high acquisition for vehicle location determination and controlling method for the same - Google Patents

Abstract

Provided are a receiver considering a high sensitivity and high precision of a vehicle position recognition GNSS and a control method thereof. Receiver and control method considering the high sensitivity and high precision of vehicle position recognition GNSS according to the present invention is a GPS navigation signal of the frequency band used in the GPS (Global Positioning System), and a satellite navigation system (Galileosat) Galileo An RF receiver for processing a Galileo input signal in a frequency band used by the control unit, and adjusting the time difference between the GPS input signal and the Galileo input signal to be equal to or less than a predetermined value, and performing positioning based on the adjustment result. It includes a positioning part.

GNSS receiver, GPS, Galileo, positioning

Description

GLOBAL NAVIGATION SATELLITE SYSTEM RECEIVER CONSIDERING HIGH SENSITIVITY AND HIGH ACQUISITION FOR VEHICLE LOCATION DETERMINATION AND CONTROLLING METHOD FOR THE SAME}

The present invention relates to a receiver in consideration of high sensitivity and high precision of a vehicle position recognition GNSS and a control method thereof.

Recently, a positioning technology using a wireless signal has been developed and widely used. Such a typical radio navigation system is NAVSTAR GPS (NAVigation Satellite Timing And Ranging Global Positioning System), commonly referred to as GPS (Global Positioning System). The GPS system is composed of a ground control station, a satellite group, and a user group.

Ground control stations or satellites operate in the United States, and users can only receive GPS satellite signals. In other words, the GPS has a structure of a unidirectional communication system composed of a GPS satellite that transmits only and a GPS receiver that receives only the GPS.

As such, GPS was designed for military use during the Cold War, but after the end of the Cold War, it released the SA (Selective Availability) at 4am on May 1, 2000, so that some of the GPS services could be used by civilians. As a result, location accuracy has improved by approximately 10 times for private users.

Due to the improved position accuracy of the standard positioning service (SPS), conventional civil GPS users have improved the positioning accuracy without any additional manipulations, thus expanding the use of GPS in many fields.

Until now, the problem with this system was that GPS accuracy was around 20 to 30 meters, which prevented it from functioning near the busy intersections of the city's most important moments. In other words, effective vehicle navigation requires a position accuracy of about 10m, and route guidance is often inaccurate because it is difficult to properly distinguish complicated roads near intersections with 20-30m accuracy. However, the current vehicle navigation system has a suitable distance error due to the development of additional systems, as well as the elimination of SA, is being widely expanded around the world.

As the use of GPS has expanded in Europe, Europe has begun to develop satellite expansion systems to increase the reliability of GPS use. Called EGNOS (European Geostationary Navigation Overlay System), it aims to improve the availability and reliability of satellite signals in Europe by using geostationary satellites such as Inmarsat in addition to GPS and GLONASS in Russia.

This plan in Europe is further evolving, by 2008, developing Galileo, a satellite navigation system consisting of over 30 unique Galileosat, such as GPS. Unlike GPS developed by the US Department of Defense, Galileo is developing under the initiative of the private sector, allowing private companies to participate while maintaining maximum publicity, and currently aims to commercialize in 2008.

Ultimately, the establishment of the Global Navigation Satellite System (GNSS), which integrates all available satellite navigation systems, is the final goal in the field of satellite navigation.

However, GPS basically has an RF structure that can use only the L1 band and cannot be used as a GNSS receiver. To further reduce the conventional distance error by using the GNSS receiver, a multiband RF structure capable of receiving both GPS and Galileo frequency bands is required.

The present invention has been made to improve the prior art as described above, and can simultaneously receive and process conventional GPS and Galileo navigation information data to be used in the future, and high sensitivity (High Sensitivity) and high precision of the next-generation vehicle position recognition GNSS ( It is intended to provide a receiver structure considering high acquisition.

In addition, the present invention is to solve the synchronization problem with the Coarse / Acquisition (C / A) code caused by the inaccuracy of the signal transmitted from the satellite navigation system.

In addition, the present invention is to design a high-sensitivity positioning architecture in an asymmetric structure using 20 correlator, to maximize the reception amplification rate and to minimize the noise to improve the reception rate.

In addition, according to the present invention, since the same C / A code is repeatedly transmitted 20 times in the satellite navigation system, an adaptive structure capable of using all of the same C / A codes is configured to limit the number of correlators according to the surrounding environment. It is possible to improve the reception performance of the satellite navigation system by making it possible to reduce the unnecessary delay time of the system and to ensure the continuity of the synchronization tracking by reducing the synchronization acquisition delay time.

The receiver considering the high sensitivity and high accuracy of the vehicle position recognition GNSS according to one aspect of the present invention, in the Galileo, a satellite navigation system consisting of a GPS input signal of the frequency band used in the Global Positioning System (GPS) and a satellite group (Galileosat) An RF receiver for processing a Galileo input signal in a frequency band to be used, and adjusting the time difference between the GPS input signal and the Galileo input signal to be equal to or less than a predetermined value, and performing positioning based on the adjustment result. It includes a location.

In this case, the RF receiver is a first band processing unit for processing an input signal of 1575.42 MHz, which is an E1 band of Galileo, which is a satellite navigation system consisting of 1575.42 MHz, which is a L1 band of a global positioning system (GPS), and a satellite group (Galileosat), of the Galileo. A second band processor for processing a 1207.1 MHz frequency signal, which is an E5A band, and a third band processor for processing a 1176.45 MHz frequency signal, which is an E5B band of the Galileo.

In this case, the first band processor is configured to generate a first intermediate frequency (IF) signal using a first local oscillator for generating a first oscillation signal, the GPS input signal or the Galileo input signal, and the first oscillation signal. A first mixer, a first band pass filter for passing a predetermined band of the first intermediate frequency signal, a first intermediate frequency amplifier for amplifying a signal having passed the predetermined band, and a second generating oscillation signal A second local oscillator, a second mixer for generating a second intermediate frequency (IF) signal using the amplified signal and the second oscillating signal, and an amplifier for amplifying the second intermediate frequency (IF) signal; Can be.

In this case, the second band processor may include a third local oscillator for generating a third oscillation signal, a third mixer for generating a third intermediate frequency (IF) signal using the Galileo input signal, and the third oscillation signal, A third bandpass filter for passing a predetermined band of a third intermediate frequency signal, a third intermediate frequency amplifier for amplifying a signal having passed the predetermined band, a fourth local oscillator for generating a fourth oscillation signal, and It may include a fourth mixer for generating a fourth intermediate frequency (IF) signal using the amplified signal and the fourth oscillation signal, and an amplifier for amplifying the fourth intermediate frequency (IF) signal.

In this case, the third band processing unit generates a fifth intermediate frequency (IF) signal using a fifth local oscillator for generating a fifth oscillation signal, the Galileo input signal, and the fifth oscillation signal, and the fifth mixer. A fifth bandpass filter for passing a predetermined band of a five intermediate frequency signal, a fifth intermediate frequency amplifier for amplifying a signal passing the predetermined band, a fifth local oscillator for generating a fifth oscillation signal, and the amplification And a fifth mixer for generating a fifth intermediate frequency (IF) signal using the received signal and the fifth oscillation signal, and an amplifier for amplifying the fifth intermediate frequency (IF) signal.

At this time, the positioning unit is a synchronization acquisition unit for adjusting the time difference between the GPS input signal and the Galileo input signal to be less than a predetermined value, and the synchronization tracking unit such that there is no time difference between the reference signal and the input signal. It may include.

In this case, the positioning unit generates a prompt code, a first code, a second code, a third code, and a fourth code by using an I signal and a Q signal of the GPS input signal or the Galileo input signal. A code generator, a discriminator for eliminating phase error using the I and Q signals, a loop filter for eliminating frequency errors using the I and Q signals, a prompt code, a first code, A code phase discriminator for calculating a code phase error using the second code, the third code, and the fourth code may be included.

At this time, the code generator may be such that the difference between the signal power of the first code and the fourth code, so that the prompt code is synchronized with the satellite code.

In this case, the first code is a half-chip leading code to the prompt code, the second code is a quarter-chip leading code to the prompt code, and the third code is a quarter-chip leading code to the prompt code Code, and the fourth code may be a half chip tail code to the prompt code.

According to one aspect of the present invention, a method for controlling a receiver considering high sensitivity and high precision of a vehicle position recognition GNSS includes a GPS input signal of a frequency band used by a global positioning system (GPS) and a satellite navigation system (Galileosat). Processing a Galileo input signal in a frequency band used in Galileo, and adjusting the time difference between the GPS input signal and the Galileo input signal to be equal to or less than a predetermined value and positioning based on the adjustment result. It includes a step.

In this case, the step of processing the GPS input signal of the frequency band used in the Global Positioning System (GPS) and the Galileo input signal of the frequency band used by Galileo, a satellite navigation system composed of a satellite group (Galileosat), the GPS ( Processing an input signal of 1575.42 MHz of Galileo, a satellite navigation system composed of Galileosat, an L1 band of Global Positioning System), and processing a 1207.1 MHz frequency signal of Galileo's E5A band; And processing a 1176.45 MHz frequency signal that is the E5B band of the Galileo.

In this case, the step of processing an input signal of 1575.42MHz, which is an E1 band of Galileo, which is a satellite navigation system consisting of 1575.42MHz, which is a L1 band of the Global Positioning System (GPS), and a satellite group (Galileosat), generating a first oscillation signal. Generating a first intermediate frequency (IF) signal using the GPS input signal or the Galileo input signal and the first oscillation signal, passing a predetermined band of the first intermediate frequency signal, Amplifying a signal passing through a predetermined band, generating a second oscillating signal, generating a second intermediate frequency (IF) signal using the amplified signal and the second oscillating signal, and And amplifying the second intermediate frequency (IF) signal.

In this case, the processing of the 1207.1 MHz frequency signal, which is the E5A band of Galileo, may include generating a third oscillation signal, using a Galileo input signal, and the third oscillation signal to generate a third intermediate frequency (IF) signal. Generating, passing a predetermined band of the third intermediate frequency signal, amplifying a signal passing the predetermined band, generating a fourth oscillation signal, the amplified signal and the second signal The method may include generating a fourth intermediate frequency (IF) signal using the four oscillation signal, and amplifying the fourth intermediate frequency (IF) signal.

In this case, the processing of the 1176.45 MHz frequency signal, which is the E5B band of the Galileo, may include generating a fifth oscillation signal, using a Galileo input signal, and the fifth oscillation signal to generate a fifth intermediate frequency (IF) signal. Generating, passing a predetermined band of the fifth intermediate frequency signal, amplifying a signal passing the predetermined band, generating a fifth oscillation signal, the amplified signal and the second signal The method may include generating a fifth intermediate frequency (IF) signal by using the fifth oscillation signal, and amplifying the fifth intermediate frequency (IF) signal.

In this case, the step of positioning based on the adjustment result, the step of adjusting the time difference between the GPS input signal and the Galileo input signal to be less than a predetermined value, and the time difference between the reference signal and the input signal It may include the step of avoiding.

In this case, positioning based on the adjustment result may include a prompt code, a first code, a second code, and a third code using an I signal and a Q signal of the GPS input signal or the Galileo input signal. Generating a fourth code, removing a phase error using the I signal and the Q signal, removing a frequency error using the I signal and the Q signal, and the prompt code. The method may include calculating a code phase error using the first code, the second code, the third code, and the fourth code.

In this case, generating the prompt code, the first code, the second code, the third code, and the fourth code by using the I signal and the Q signal of the GPS input signal or the Galileo input signal, The prompt code may be synchronized with the satellite code by ensuring that there is no difference in signal power between the first code and the fourth code.

In this case, the first code is a half-chip leading code to the prompt code, the second code is a quarter-chip leading code to the prompt code, and the third code is a quarter-chip leading code to the prompt code Code, and the fourth code may be a half chip tail code to the prompt code.

According to the present invention, it is possible to provide a receiver structure that simultaneously receives and processes conventional GPS and Galileo navigation information data to be used in the future, and takes into account high sensitivity and high accuracy of next-generation vehicle position recognition GNSS.

Further, according to the present invention, it is possible to solve the synchronization problem with the Coarse / Acquisition (C / A) code caused by the inaccuracy of the signal transmitted from the satellite navigation system.

In addition, according to the present invention, by designing a highly sensitive positioning architecture in an asymmetric structure using 20 correlators, it is possible to improve reception by maximizing reception amplification and minimizing noise.

In addition, according to the present invention, by repeatedly transmitting the same C / A code 20 times in the satellite navigation system, by configuring an adaptive structure that can use the same C / A code, the number of the correlator according to the surrounding environment Since it is possible to limit the delay time of the unnecessary system and reduce the acquisition delay time of the system, it is possible to ensure the persistence of the synchronization tracking, thereby improving the reception performance of the satellite navigation system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, but the present invention is not limited or limited to the embodiments. Like reference numerals in the drawings denote like elements.

1 is a block diagram of a receiver considering high sensitivity and high precision of a vehicle position recognition GNSS according to an example of the present invention. Referring to Figure 1 will be described a receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS according to an example of the present invention.

As shown in FIG. 1, the receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS according to an example of the present invention includes an RF receiver 110 and a positioning unit 120.

The RF receiver 110 processes a GPS input signal of a frequency band used by a global positioning system (GPS) and a Galileo input signal of a frequency band used by a Galileo, a satellite navigation system composed of a satellite group (Galileosat).

The positioning unit 120 adjusts the GPS input signal and the Galileo input signal so that a time difference between the reference signal is equal to or less than a predetermined value and performs positioning based on the adjustment result.

The GNSS-based RF receiver should have a structure capable of receiving conventional GPS and navigation information data of Galileo to be used in the future. therefore. It consists of a multiband that can simultaneously receive 1575.42MHz, the L1 band of GPS, 1575.42MHz, the E1 band of Galileo, 1207.1MHz, the E5A band, and 1176.45MHz, the E5B band.

The positioning unit 120 includes a correlator of Early_early code, Early_late code, Prompt code, Late_early code, and Late_late code structure, rather than Early code, Prompt code, and Late code structure of the conventional correlator structure.

As described above, according to the correlator structure of the quarter-chip separation structure, the synchronization problem with the Coarse / Acquisition (C / A) code caused by the inaccuracy of the signal transmitted from the satellite navigation system can be solved. The synchronization problem with the C / A code causes a synchronization acquisition delay time problem of the vehicular navigation system, resulting in performance degradation of the receiver.

The positioning unit 120 according to an example of the present invention may be designed in an asymmetric structure using 20 correlators to maximize reception amplification and minimize noise to improve reception.

The satellite navigation system transmits the same C / A code 20 times. Therefore, the receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS according to an example of the present invention has an adaptive structure that can use the same C / A code. As a result, the number of correlators can be limited according to the surrounding environment, thereby reducing unnecessary system delay time. In addition, the synchronization acquisition delay time can be a week, and the continuity of the synchronization tracking can be guaranteed.

2 is a block diagram of an RF receiver according to an example of the present invention. An RF receiver according to an example of the present invention will be described with reference to FIG. 2.

As shown in FIG. 2, the RF receiver according to an example of the present invention includes a multi-band block capable of receiving the L1 band of GPS, the E1 band, the E5A band, and the E5B band of Galileo.

That is, the RF receiver according to an example of the present invention is a first band for processing an input signal of 1575.42 MHz, which is an L1 band of a global positioning system (GPS), and an E1 band, which is an E1 band of Galileo, a satellite navigation system composed of a satellite group (Galileosat). A processing unit 210, a second band processing unit 220 for processing a 1207.1 MHz frequency signal of the E5A band of Galileo, and a third band processing unit 230 for processing a 1176.45 MHz frequency signal of the E5B band of Galileo do.

The L1 band of the first band processing unit 210 and the E1 band of Galileo may select 75.42 MHz as the first intermediate frequency from the input signal 1575.42 MHz and set the local oscillation frequency to 1500 MHz.

The PLL 218 and VCO 219 can be used to solve the frequency stability problem, which is the most important factor in the first local oscillator 211, and the PLL 218 and VCO 219 at 750 MHz at the 10 MHz main clock. Can be configured by multiplying.

In the PLL 218 circuit, a PLL IC receives a microprocessor signal and a local oscillation circuit having accurate stability may be configured.

The first mixer 212 uses the input RF frequency and the local oscillation signal of the first local oscillator 211 to generate a first IF of 75.42 MHz, which in turn generates a bandpass filter 213 having a band of 4 MHz. After that, it is input to the second mixer 216 through the IF AMP 214. The second local oscillator 215 selects a local oscillation frequency of 64.72 MHz and uses the VCXO, and increases the output level by using the AMP 217 to be processed by the secondary mixer. The IF signal of 10.7 MHz can be amplified by the AMP 217.

Galileo's E5A band selects 107.14 MHz as the first intermediate frequency from the input signal 1207.14 MHz, and can set the local oscillation frequency to 1500 MHz.

Similarly, the third local oscillator 221 can be used as a PLL (228) and a VCO (229) to solve the stability problem, and doubled using a PLL (228) and a VCO (229) of 750 MHz at a 10 MHz main clock. Can be configured.

The third mixer 222 generates the first IF of 107.14 MHz using the input RF frequency and the local oscillator signal of the third local oscillator 221, which in turn passes through a bandpass filter 223 having a band of 4 MHz. The input is input to the fourth mixer 226 through the IF AMP 224. The fourth local oscillator 225 may select a local oscillation frequency of 96.44 MHz to use as the VCXO, and increase the output level by using the AMP 227 to process the secondary mixer. The IF signal of 10.7 MHz can be amplified by the AMP 227.

In Galileo's E5B band, the local oscillation frequency can be set to 1500 MHz by selecting 76.45 MHz as the first intermediate frequency from the input signal 1176.45 MHz. It can be configured by multiplying by using PLL 238 and VCO 239 of 750MHz at 10MHz main clock.

The fifth mixer 232 uses the input RF frequency and the local oscillator signal of the fifth local oscillator 231 to generate a primary IF of 76.45 MHz, which in turn passes through a bandpass filter 233 having a band of 4 MHz. The sixth mixer 236 is input to the sixth mixer 236 through the IF AMP 234. The sixth local oscillator 235 may select a local oscillation frequency of 65.75 MHz to use the VCXO, and increase the output level by using the AMP 237 to process the secondary mixer. IF signal of 10.7MHz can be amplified by the AMP (237).

3 is a configuration diagram of a positioning unit according to an example of the present invention. The configuration of the positioning unit according to an example of the present invention will be described with reference to FIG. 3.

In order to perform precise positioning, positioning is required after acquiring synchronization and tracking.

Signal Acquisition is called Acquisition, which adjusts the time difference between two signals to be within one chip while moving the reference signal by one chip or 1/2 chip, and the time difference is within one chip. The process of finely adjusting the adjusted input signal and the reference signal so that the time difference becomes "0" and maintaining the state is called synchronous tracking.

As shown in FIG. 3, the positioning unit according to an example of the present invention includes a code generator 310, a code phase discriminator 320, a discriminator 330, a loop filter 340, and a carrier generator 350. do.

The code generator 310 generates a prompt code, a first code, a second code, a third code, and a fourth code by using an I signal and a Q signal of the GPS input signal or the Galileo input signal. The first code is a half-chip leading code to the prompt code, the second code is a quarter-chip leading code to the prompt code, and the third code is a quarter-chip leading code to the prompt code. The four code may be a half chip backsumming code to the prompt code.

In this case, the code generator 310 may be configured such that there is no difference in signal power between the first code and the fourth code, thereby synchronizing the prompt code with the satellite code.

The discriminator 330 removes the phase error by using the I and Q signals.

The loop filter 340 removes the frequency error by using the I and Q signals.

The code phase classifier 320 calculates a code phase error using the prompt code, the first code, the second code, the third code, and the fourth code.

4 is a view for explaining a synchronization process of the positioning unit according to an example of the present invention. The synchronization process of the positioning unit according to an example of the present invention will be described with reference to FIG. 4.

The positioning unit according to an example of the present invention generates an Early_early code 410, Early_late code 420, Prompt code 430, Late_early code 440, Late_late code 450, and then outputs through signal multiplication and integration The code delay is calculated using the I and Q signal powers.

In this case, Early_early code is 1/2 chip lead code of Prompt code, Early_late code is 1/4 chip lead code of Prompt code, Late_early code is 1/4 chip tail code of Prompt code, and Late_late code is Represents a half-chip trailing code.

Each of the above codes has a symmetrical structure around the prompt code. Therefore, the code generator is controlled so that the difference between the signal power of the Early_early code and the Late_late code is "0" so that the Prompt code is synchronized with the satellite code.

In addition, the carrier tracking loop includes a discriminator 330, a loop filter 340, and a carrier generator 350, and eliminates phase error or frequency error through a discriminator and a loop filter using I and Q signals.

The PLL enables precise phase tracking, providing pseudorange measurements based on highly accurate phase measurements.

The code phase classifier 320 calculates a code phase error using five correlators, Early_early code, Early_late code, Prompt code, Late_early code, and Late-late code output values.

As shown in FIG. 4, when the code phase of the input signal coincides with the code generated by the correlator, the correlation value of Early_early code and Late_late code or Early_late code and Late_early code is the same, and the Prompt code of the correlation function Point to the highest.

If there is no error, the correlation value of Early_early code and Late_late code or Early_late code and Late_early code is the same, and the prompt code indicates the highest value of the correlation function.

If there is an error, even if the correlation value of Early_early code and Late_late code is different, if the correlation value of Early_late code and Late_early code match, it is determined that the synchronization with Prompt code is correct.

In addition, if there is a different error, even when the correlation value of Early_late code and Late_early code is different, it is determined that the synchronization code is synchronized with the correlation code of Early_early code and Late_late code.

5 and 6 are structural diagrams of an adaptive simple asymmetric multiple correlator 24842 according to an example of the present invention. 5 and 6, an adaptive simple asymmetric multiple correlator 24842 structure according to an example of the present invention will be described.

The positioning unit according to an example of the present invention is an adaptive simple asymmetric multiple correlator, which can increase the reception rate of the satellite navigation system.

In the adaptive simple asymmetric multiple correlator structure according to an example of the present invention, 20 correlators were used as the asymmetric structure.

The satellite transmits the same C / A code 20 times each time. Therefore, according to an example of the present invention, all 20 correlators may be used to configure the sensitivity to be maximized. In addition, bit edge detectors 510 and 610 may be used to synchronize 20 C / A codes.

In addition, each correlator adds serially and repeatedly to increase reception amplification.

That is, 20 correlators amplify the signal by serially adding signals, and the outputs of the same correlators add up again to increase the reception rate. Can be amplified sufficiently, while the noise level can be constructed as low as possible.

Therefore, according to an example of the present invention, two early_early (520, 620) of the correlator having the highest amplification rate are four, four early_late (530, 630), eight prompt (540, 640), and late_early (550). , 650 may be configured as four, and Late_late 560 and 660 may be configured as two.

In addition, it is possible to add BOC generators 570 and 670, which are modulation schemes that GNSS navigation systems use in Galileo to form an integrated structure of GPS and Galileo. Since the number of correlators has an asymmetric structure, the noise level of each correlator is different, and thus the reception rate may be lowered. Therefore, the noise level is averaged for each asymmetry at the output terminal to match the noise level.

The adaptive simple asymmetric multiple correlator according to an example of the present invention has an adaptive structure, a simple structure, and an asymmetric structure.

The characteristic of the adaptive structure is that the sensitivity reader determines whether there is an environment suitable for receiving navigation information data from the satellite, and in the case of an environment suitable for reception, basically five correlators, Early_early, Early_late, Prompt, Late_early, and Late_late Use only However, in the case of poor reception of navigation information data from the satellite due to poor surroundings such as a city center or a forest of trees, 10, 15, and 20 correlators may be extended and used.

As such, when the reception sensitivity is lowered according to the surrounding environment, the sensitivity reader 580 determines that the number of correlators is increased to operate as an adaptive receiver structure according to the surrounding environment. Using this adaptive structure can reduce the number of correlators in a typical environment, thereby reducing the system's operational latency.

In the conventional correlator, I, Q are used at the same time to form early, prompt, and late structures. However, according to an example of the present invention, since 20 asymmetric correlators are used, the complexity may be greater than that of the conventional correlators. However, in order to minimize this, it can be configured to perform the function of the Q phase while using only the I phase. Therefore, compared with the existing correlator structure, the complexity does not increase significantly.

As for the asymmetric correlator structure according to an embodiment of the present invention, Early_early, Early_late, Prompt, Late_early, and Late_late have a 24842 structure.

Structures that can be achieved using 20 correlators include 24842, 34643, 44444, 54245, 42824, 52625, 62426, and 72227.

However, in consideration of the fact that the amplification rate of the received signal is closely related to the reception rate of the navigation message at the receiver, the amplification rate of the received signal can be designed as an asymmetric structure 24842.

7 is a flowchart illustrating a control method of a receiver in consideration of high sensitivity and high precision of a vehicle position recognition GNSS according to an exemplary embodiment of the present invention. A control method of a receiver considering high sensitivity and high precision of a vehicle position recognition GNSS according to an example of the present invention will be described with reference to FIG. 7.

The receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS according to an example of the present invention processes the GPS input signal and the Galileo input signal (S710).

In more detail, the receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS is used in Galileo, a satellite navigation system composed of a GPS input signal of a frequency band used in the Global Positioning System (GPS) and a satellite group (Galileosat). It processes the Galileo input signal of the frequency band.

At this time, the receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS receives an input signal of 1575.42 MHz, which is a satellite navigation system of 1575.42 MHz, which is a L1 band of the Global Positioning System (GPS), and a Galileo satellite system (Galileosat). Can be processed.

In this case, the receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS generates a first oscillation signal when processing the L1 and E1 bands, and generates the GPS input signal or the Galileo input signal and the first oscillation. Generate a first intermediate frequency (IF) signal using the signal, pass a predetermined band of the first intermediate frequency signal, amplify the signal passing the predetermined band, and generate a second oscillation signal A second intermediate frequency (IF) signal may be generated using the amplified signal and the second oscillation signal, and the second intermediate frequency (IF) signal may be amplified.

In addition, the receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS can process the 1207.1 MHz frequency signal, which is the E5A band of the Galileo.

In this case, the receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS generates a third oscillation signal during the input signal processing of the E5A band, and uses the Galileo input signal and the third oscillation signal to generate a third intermediate frequency. Generate an (IF) signal, pass a predetermined band of the third intermediate frequency signal, amplify the signal that has passed the predetermined band, generate a fourth oscillation signal, and generate the amplified signal and the A fourth intermediate frequency IF signal may be generated using the fourth oscillation signal, and the fourth intermediate frequency IF signal may be amplified.

In addition, the receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS can process the 1176.45MHz frequency signal, which is the E5B band of the Galileo.

In this case, the receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS generates a fifth oscillation signal when processing an input signal in the E5B band, and uses the Galileo input signal and the fifth oscillation signal to generate a fifth intermediate frequency. Generating an (IF) signal, passing a predetermined band of the fifth intermediate frequency signal, amplifying a signal passing through the predetermined band, generating a fifth oscillating signal, and The fifth oscillation signal may be used to generate a fifth intermediate frequency IF signal and to amplify the fifth intermediate frequency IF signal.

Subsequently, the receiver considering high sensitivity and high precision of the vehicle position recognition GNSS adjusts the time difference between the GPS input signal and the Galileo input signal to be equal to or less than a predetermined value (S720), and based on the adjustment result. Positioning may be performed (S730).

The receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS adjusts the GPS input signal and the Galileo input signal so that the time difference between the reference signal is equal to or less than a predetermined value at the time of positioning based on the adjustment result. There may be no time difference between the reference signal and the input signal.

In more detail, when positioning the receiver in consideration of the high sensitivity and high precision of the vehicle position recognition GNSS, a prompt code (Prompt) code, Generate a first code, a second code, a third code, and a fourth code, remove a phase error using the I and Q signals, remove a frequency error using the I and Q signals, and The code phase error may be calculated using the prompt code, the first code, the second code, the third code, and the fourth code.

In this case, the difference between the signal power of the first code and the fourth code may be such that the prompt code is synchronized with the satellite code.

In this case, the first code is a half-chip leading code to the prompt code, the second code is a quarter-chip leading code to the prompt code, and the third code is a quarter-chip leading code to the prompt code Code, and the fourth code may be a half chip backsumming code to the prompt code.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

1 is a block diagram of a receiver considering high sensitivity and high precision of a vehicle position recognition GNSS according to an example of the present invention.

2 is a block diagram of an RF receiver according to an example of the present invention.

3 is a configuration diagram of a positioning unit according to an example of the present invention.

4 is a view for explaining a synchronization process of the positioning unit according to an example of the present invention.

5 and 6 are structural diagrams of an adaptive simple asymmetric multiple correlator 24842 according to an example of the present invention.

7 is a flowchart illustrating a control method of a receiver in consideration of high sensitivity and high precision of a vehicle position recognition GNSS according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110: RF receiver 120: positioning part

310; Code generator 320: code phase discriminator

330: discriminator 340: loop filter

350: carrier generator

Claims (18)

An RF receiver for processing a GPS input signal of a frequency band used by a GPS (Global Positioning System) and a Galileo input signal of a frequency band used by a Galileo, a satellite navigation system comprising a satellite group (Galileosat); And And a positioning unit that adjusts the GPS input signal and the Galileo input signal so that a time difference between the reference signal is equal to or less than a predetermined value, and performs positioning based on the adjustment result. The positioning unit performs positioning using the code phase of the input signal, 20 correlators and code phase discriminators, The 20 correlators have an asymmetrical structure consisting of two Early_early correlators, four Early_late correlators, eight Prompt correlators, four Late_early correlators, and two Late_late correlators. Serially sum the output signals and amplify the signals, Based on the determination of the sensitivity reader 680, the positioning unit operates only five correlators in an environment with good reception sensitivity, and increases the number of correlators operating in an environment with poor reception sensitivity to 10, 15, and 20 positions. and, The code phase discriminator calculates code phase error using a prompt code, Early_early code, Early_late code, Late_early code, and Late_late code generated by the input signal and the 20 correlators. The Early_early code is 1/2 chip leading code to the prompt code, The Early_late code is a quarter chip leading code to the prompt code, The Late_early code is a 1/4 chip trailing code to the prompt code, The Late_late code is a receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS, characterized in that the half-code tail code to the prompt code. The method of claim 1, The RF receiver, A first band processor configured to process an input signal of 1575.42 MHz, which is an L1 band of a global positioning system (GPS), and an E1 band of Galileo, a satellite navigation system comprising a satellite group (Galileosat); A second band processor which processes the 1207.1 MHz frequency signal which is the E5A band of the Galileo; And A third band processor configured to process a 1176.45 MHz frequency signal that is the E5B band of Galileo Receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS comprising a. The method of claim 2, The first band processing unit, A first local oscillator for generating a first oscillation signal; A first mixer configured to generate a first intermediate frequency (IF) signal using the GPS input signal or the Galileo input signal and the first oscillation signal; A first band pass filter for passing a predetermined band of the first intermediate frequency signal; A first intermediate frequency amplifier for amplifying the signal passing through the predetermined band; A second local oscillator for generating a second oscillation signal; A second mixer configured to generate a second intermediate frequency (IF) signal using the amplified signal and the second oscillation signal; And Amplifier for amplifying the second intermediate frequency (IF) signal Receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS comprising a. The method of claim 2, The second band processing unit, A third local oscillator for generating a third oscillation signal; A third mixer configured to generate a third intermediate frequency (IF) signal using the Galileo input signal and the third oscillation signal; A third band pass filter for passing the predetermined band of the third intermediate frequency signal; A third intermediate frequency amplifier for amplifying the signal passing through the predetermined band; A fourth local oscillator for generating a fourth oscillation signal; A fourth mixer for generating a fourth intermediate frequency (IF) signal by using the amplified signal and the fourth oscillation signal; And Amplifier for amplifying the fourth intermediate frequency (IF) signal Receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS comprising a. The method of claim 2, The third band processing unit, A fifth local oscillator for generating a fifth oscillation signal; A fifth mixer configured to generate a fifth intermediate frequency (IF) signal using the Galileo input signal and the fifth oscillation signal; A fifth band pass filter for passing the predetermined band of the fifth intermediate frequency signal; A fifth intermediate frequency amplifier for amplifying the signal passing through the predetermined band; A fifth local oscillator for generating a fifth oscillation signal; A fifth mixer configured to generate a fifth intermediate frequency (IF) signal using the amplified signal and the fifth oscillation signal; And Amplifier for amplifying the fifth intermediate frequency (IF) signal Receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS comprising a. The method of claim 1, The positioning portion, A synchronization acquisition unit that adjusts the GPS input signal and the Galileo input signal so that a time difference between a reference signal is equal to or less than a predetermined value; And A synchronization tracking unit to prevent time difference between the reference signal and the input signal Receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS comprising a. The method of claim 1, The positioning portion, A code generator for generating a prompt code, a first code, a second code, a third code, and a fourth code by using an I signal and a Q signal of the GPS input signal or the Galileo input signal; A discriminator for removing phase error using the I and Q signals; A loop filter for removing frequency error using the I and Q signals; And A code phase discriminator for calculating a code phase error using the prompt code, the first code, the second code, the third code, and the fourth code; Receiver considering the high sensitivity and high precision of the vehicle position recognition GNSS comprising a. The method of claim 1, The positioning portion, The receiver considering high sensitivity and high precision of the vehicle position recognition GNSS, characterized in that the difference between the signal power of the prompt code and the Late_late code, so that the prompt code is synchronized with the satellite code. delete delete delete delete delete delete delete delete delete delete

Images