KR20020078361A - High-Precision GPS Chipset Using Embedded DGPS Data Receiving Units for On-Air Broadcasting Subcarrier - Google Patents

Abstract

PURPOSE: A high density global positioning system(GPS) chip set incorporated therein differential global positioning system(DGPS) information data process device by using an additional skywave broadcast is provided to improve the accuracy of a conventional GPS engine by fabricating a position correction information selected from various information transmitted from the additional skywave broadcast decoder and a carrier wave data detected in the GPS engine. CONSTITUTION: A high density GPS chip set incorporated therein DGPS information data process device by using the additional skywave broadcast includes a GPS signal processor(22), a microprocessor(26), a communication port(28) and a GPS engine(31). A primitive information reconstructed in a dedicated decoder(25) through the sky wave antenna(23) and a terminal of a tuner(24) generates an interrupt related to the decoder by inputting a received signal to the microprocessor(26) through a GPIO of the GPS chip set. When a GPS observed data determined at the GPS signal processor(22) through a GPS antenna(18) and a low noise amplifier(19) is created, the interrupt related to the GPS is generated. The high density GPS chip set provides a position information(30) to a user in real time through the incorporated communication port(28) by extracting the additional skywave broadcast and a high density position determination work by the microprocessor(26) of the GPS chip set.

Description

High-Precision GPS Chipset Using Embedded DGPS Data Receiving Units for On-Air Broadcasting Subcarrier

The present invention relates to a digital chipset (Differential Global Positioning System, hereinafter referred to as "DGPS") information data processing unit built-in high-precision (GPS) chipset using airwave additional broadcasting,

More specifically, in order to determine the data processing and the high-precision position of the over-the-air broadcasting using a DGPS correction information of the over-the-air broadcasting, a dedicated processor for processing the over-the-air broadcasting, which is a conventional method, is used. Not to process the position correction signal contained in the over-the-air supplementary broadcasting and transmit it to the GPS engine, but to perform the reception processing related to the over-the-air supplementary broadcasting using a processor installed in the GPS engine, and to use a separate high-precision positioning data using the information. By performing the processing in the GPS engine, the accuracy of the existing GPS engine is further improved by processing the position correction information and the carrier data observed in the GPS engine among the various information transmitted from the airwave additional broadcasting decoder. One microprocessor Additional broadcast information, and to perform the processing and high-precision positioning operation, which relates to high-precision GPS chipset composed of a low-power and small size due to the use.

In general, GPS is a satellite positioning system, which is a state-of-the-art satellite positioning system that provides accurate time information while providing the ability to determine three-dimensional position in real time.

The GPS can serve as an excellent location information provider in various fields requiring its location and speed information, but has a problem of being limited in positioning ability due to its structural limitations. The technology developed to solve the constraints involved in positioning is a differentially-corrected DGPS positioning technique. The precision is several centimeters (cm) to several meters (m) depending on the correction information utilized in the DGPS and the performance of the receiver used. In the case of RTK (Real-Time Kinematic) using various real-time carrier observation data up to now, the positioning accuracy has a very precise position value of several centimeters (cm), but there is a problem of using an expensive receiver.

In general, when using a real-time pseudorange correction value known as DGPS, there is an economical advantage of using a low-cost GPS terminal, but the precision is several meters (m), so the personal navigation system (PNS) or There is a problem that is difficult to apply to applications that require more precise location, such as geographic information system (GIS).

In addition, one of the important factors in the GPS positioning technique using the DGPS is a transmission medium for DGPS correction information. The airwave additional broadcasting method recommended in the DGPS information transmission method can receive information simultaneously at a low price. Although there is an advantage, there is a problem in that a cost burden is added because a dedicated terminal including a decoder part for extracting information contained in additional broadcasting and a microprocessor part for data processing is required.

On the other hand, the conventional DGPS positioning system using the airwave additional broadcasting is composed of a separate airwave additional broadcasting terminal 1 and the GPS receiving system 2, as shown in the accompanying drawings, The broadcast terminal 1 passes through the airwave antenna 3 and the tuner 4, and then recovers the raw information recovered by the dedicated decoder 5 through the main control unit 6, RTCM (Radio Technical Commission for International Recommendation). Maritime Service) In accordance with the SC-104 standard, the RS-232 communication port 7 transmits to the GPS receiver, and the GPS receiving system 2 passes the GPS antenna 9 and the low noise amplifier 10 and then the GPS signal. After determining the position in the microprocessor 15 by using the observation data determined by the processor 13 and the DGPS correction information received through the communication port 14, the position information 17 is provided to the user in real time. A.

However, the DGPS positioning system requires a dedicated airwave additional broadcasting terminal for receiving DGPS correction information, and can only use a pseudo distance correction value using a C / A code having the lowest precision among DGPS data processing techniques. There is an unsuitable problem in the field requiring precision within the system. Also, the system composed of two terminals equipped with each microprocessor has a problem of taking up a lot of space since power consumption and component redundancy of the terminal cannot be avoided. It is.

Therefore, due to the above problems, the DGPS positioning system, which has been conventionally practiced, is contrary to the rapidly developed communication technology, which lowers productivity and economical efficiency, and at the same time, decreases efficiency, resulting in reliability and satisfaction for users using the same. It has problems that are minimized.

The present invention has been made to solve the problems of the prior art as described above has the following object.

According to the present invention, in order to determine the data processing and the high-precision position of the airwave additional broadcast in the configuration of a receiver which improves the position accuracy of the GPS using the DGPS correction information of the airwave additional broadcast, the airwave using the conventional airwave additional broadcast processing dedicated processor Instead of processing the position correction signal included in the supplementary broadcast and transmitting it to the GPS engine, the processor equipped with the GPS engine is used to perform airborne additional broadcast reception related processing, and to perform separate high-precision positioning data processing using the information. In the GPS engine, the position correction information and the carrier data observed from the GPS engine are processed in the GPS engine to improve the accuracy of the existing GPS engine. One microprocessor To provide an additional broadcast over information processing and high-precision positioning High precision GPS chipset that can do the job that purpose.

Another object of the present invention is to incorporate a data processing unit of the DGPS correction information transmitted through the additional air broadcasting in the GPS chipset and a positioning unit capable of calculating a high-precision position within 1 m using the received correction information and the observed carrier data. It is aimed at providing high-precision GPS chipset with low price, low power and small space.

In order to achieve the above object, the present invention is to mount the data processing unit of the DGPS correction information received through the air reception tuner and the additional broadcast decoder in the GPS chipset, the precision orbital force and GPS of the GPS satellite restored from the data processing unit The carrier information of the reference station is combined with the carrier data observed from the GPS chipset to perform high-precision positioning.

1 is a block diagram illustrating a positioning system using a GPS receiver and an additional information terminal using conventional airwave additional broadcasting;

Figure 2 is a block diagram showing a high-precision GPS receiver system built-in DGPS information data processing unit using airwave additional broadcasting according to the present invention,

3 is a flowchart illustrating a main process of an embedded processor in the present invention;

4 is a flowchart illustrating a decoder-related interrupt processing procedure of an embedded processor of the present invention;

5 is a flowchart illustrating a GPS-related interrupt processing procedure of an embedded processor of the present invention;

FIG. 6 is a flowchart illustrating data processing for performing high-precision positioning using DGPS correction information calculated by an airwave additional information processing unit and carrier data determined inside a GPS chipset. FIG.

<Description of the code | symbol about the principal part of drawing>

18: GPS antenna 19: low noise amplifier

23: aerial antenna 24: tuner

25: decoder 26: microprocessor

Hereinafter, with reference to the accompanying drawings, a preferred embodiment for implementing the above-described invention will be described in detail.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, the terms to be described below are terms set in consideration of functions in the present invention, which may vary depending on the intentions or customs of the producers producing the products, and the definitions should be made based on the contents throughout the specification.

That is, the present invention is a block diagram showing a high-precision GPS receiver system built-in DGPS information data processing unit using airwave additional broadcasting, as shown in Figure 2, the airwave antenna 23 and the tuner 24 stage The raw information recovered by the dedicated decoder 25 is input to the microprocessor 26 through the GPIO of the GPS chipset to generate an interrupt related to the decoder, and the GPS signal processor via the GPS antenna 18 and the low noise amplifier 19. When the GPS observation data determined in (22) is generated, an interrupt related to GPS is generated, and the microprocessor 26 of the GPS chipset performs information extraction and high-precision positioning of the over-the-air supplementary broadcasting and transmits the result to a built-in communication port ( 28, the location information 30 is provided to the user in real time.

In addition, with reference to the accompanying drawings, FIGS. 3 to 5, the process of processing the received DGPS correction information and the over-the-air additional broadcasting information and the GPS reception data will be described in the present invention.

First, the microprocessor 26 starts the main program at the first power-up and initializes the program so that the GPS front end 20, the tuner 24, the decoder 25, and the GPS engine can be initialized. 31) initiating operation preparation by initializing each of the internal blocks, and receiving the GPS carrier information or the decoder information after the program initialization operation is completed, and processing the related work, wherein the microprocessor 26 Receiving the interrupt according to the first and processing the interrupt routines related to the GPS and the interrupt routines related to GPS, and when receiving the GPS information, the microprocessor 26 executes the GPS interrupt processing routine, Stores the received GPS carrier information in the buffer and displays the completed status on the GPS received flag. The microprocessor 26 executes the decoder interrupt processing routine even when the GPS interrupt processing routine is terminated and the decoder information is received. The decoder receives the decoder information in the buffer, and the decoder information reception flag is completed. After the flag is marked as complete in the flag, the decoder interrupt processing routine is terminated.

When the interrupt routine is processed, the main program checks the flag and starts work.

Confirming that the GPS information reception completion flag state is displayed in the completed state, and then checking the flag to confirm whether the processing is completed so that the position correction information received through the decoder 25 can be combined with the GPS carrier reception information. And, if it is completed in the above state, calculating the more precise position information by combining the processed position correction information and the GPS carrier reception information through a high-precision positioning operation, and displaying the position information calculation completion flag as the completed state. Checking the flags. If the position correction information is inappropriate to use or if it is not received, it is a step of setting the position determined by the GPS chipset itself, displaying the position information completion flag as completed, and then checking the next flag.

Checking the decoder information reception completion flag to determine whether the broadcast additional information or the position correction information is completed when the completion state is completed; and processing the position correction information to determine whether the processing is completed in the case of the position correction information; When it is completed, the position correction information processing completion flag is displayed in the completed state and the next flag is inspected. If the processing is not completed, the next flag is checked.

The following is a process of checking whether the GPS position information corrected by the above two processes and the broadcasting unit information received through the decoder are completed and transmitting them through the communication port (UART).

First, confirming whether the GPS position information is completed and the flag is displayed in a completed state. If the completion state is completed, transmitting the position information to the outside through the communication ports UART2 and 28 and initializing the flag; Check whether the flag has been processed and if it is completed, transmit it to the outside through UART1 (27), initialize the flag, and repeat the flag checking process repeatedly to further improve the accuracy through the data processing process. Positional information and over-the-air broadcasting additional information can be processed by one chipset at the same time.

In the process of performing high-precision positioning by using the carrier observation data of the reference station acquired by the supplementary airwave broadcasting and the position correction information such as the precision orbital force and the carrier observation data obtained by the GPS signal processing unit with reference to FIG. 6. Let's take a closer look.

In order to perform a high-precision positioning operation using the information first processed by the DGPS correction information data processor 62 and the GPS observation and data processor 66 mounted on one microprocessor 26 by the interrupt, Combining the carrier data 64 of the GPS reference point and the carrier observation data 67 of the GPS chipset received by the airborne additional broadcasting (68) to eliminate an error factor caused by the delay of the ion layer, and the pseudo distance using the carrier phase Determining an ambiguity constant having a great influence on the determination precision (69) to calculate a final pseudorange, and using the precision orbital force (63) and additional correction information of the GPS satellites received by the above-mentioned airwave additional broadcasting. After eliminating the cause of error of the GPS as much as possible, determining the precise position of the GPS receiver (70).

As described above, the portable terminal using GPS requires a smaller terminal and a lower current consumption than a vehicle GPS terminal, and requires a receiver with high accuracy due to operating characteristics. By using a single processor installed in the GPS engine, it is easy to manufacture a terminal equipped with a high-performance miniaturized GPS engine by processing over-the-air broadcasting and high-precision GPS-related tasks. Active response is possible.

Accordingly, the present invention provides a GPS receiver system capable of performing DGPS correction information signal processing using GPS chipset and high-precision positioning using the same, and using a GPS chipset of a GPS reference station provided by an additional broadcasting information transmission system of airwaves. Carrier observation data and precision orbital force are calculated and used together with the observed carrier data to perform high-precision positioning.

On the other hand, the present invention can be variously modified and take various forms in the system of the component unit consisting of the above configuration.

It is to be understood, however, that the present invention is not limited to the specific forms referred to in the above description, but rather includes all modifications, equivalents and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

As described above, the present invention is dedicated to the conventional airwave additional broadcast processing to determine the data processing and the high precision position of the airwave additional broadcasting in the configuration of a receiver which improves the position accuracy of the GPS using the DGPS correction information of the airwave additional broadcasting. The processor does not process the position correction signal contained in the over-the-air supplementary broadcasting and transmits it to the GPS engine. Instead, it performs the processing related to the over-the-air supplementary broadcasting using the processor installed in the GPS engine and uses the above information. Positioning data processing is performed by the GPS engine, and the position correction information and the carrier data observed by the GPS engine are processed from the inside of the GPS engine. With the effect of further enhancing, one It is effective to process additional broadcasting information and high-precision positioning by using microprocessor of microprocessor, and it is a data processing unit of DGPS correction information transmitted through air supplementary broadcasting in one GPS chipset, received correction information and observed carrier data. It is obvious that it is a very useful invention that can simultaneously achieve various effects such as low cost, low power, and low space due to the built-in positioning unit capable of calculating a high precision position within 1 m.

Claims (6)

The raw information recovered from the dedicated decoder 25 via the airwave antenna 23 and the tuner 24 stage is input to the microprocessor 26 through the GPIO of the GPS chipset to generate an interrupt related to the decoder, and the GPS antenna 18 GPS observation data determined by the GPS signal processor 22 through the low noise amplifier 19 generates an interrupt related to GPS, and the microprocessor 26 of the GPS chipset extracts the information of the airborne additional broadcasting and the high precision position. DGPS information data processing unit embedded high-precision GPS chipset using over-the-air additional broadcasting, characterized in that the determination is performed to provide the location information (30) to the user in real time through the built-in communication port (28). The method of claim 1, The microprocessor 26 starts the main program at the first power-up and initializes the program so that the GPS front end 20, the tuner 24, the decoder 25, and the GPS engine 31 are initialized. Initializing each of the blocks therein to prepare for operation; When the program initialization is completed, the GPS carrier information or the decoder information is received and processed accordingly. The microprocessor 26 receives the interrupt according to the interrupt routine related to the corresponding decoder and the interrupt routine related to GPS. First processing; Upon reception of the GPS information, the microprocessor 26 executes the GPS interrupt processing routine, stores the received GPS carrier information in a buffer, and displays a completion state on the GPS reception flag. Terminating the GPS interrupt processing routine; Even when the decoder information is received, the microprocessor 26 executes the decoder interrupt processing routine, stores the information received by the decoder in the buffer, and marks the completion state in the decoder information reception completion flag. Terminating the decoder interrupt processing routine afterwards; DGPS information data processing unit built-in high precision GPS chipset using over-the-air additional broadcasting, characterized in that consisting of. The method of claim 2, Confirming that the GPS information reception completion flag state is displayed in the completed state, and then checking the flag to confirm whether the processing is completed so that the position correction information received through the decoder 25 can be combined with the GPS carrier reception information. ; Calculating the more precise position information through a high-precision positioning operation by combining the processed position correction information and the GPS carrier reception information when the state is completed; Displaying the location information calculation complete flag as completed and checking the flag; Checking the next flag after setting the position determined by the GPS chipset itself and displaying the position information completion flag as completed when the position correction information is an inappropriate value or is not received; DGPS information data processing unit built-in high precision GPS chipset using over-the-air additional broadcasting, characterized in that consisting of. The method of claim 2, Checking the decoder information reception completion flag to determine whether broadcast additional information or position correction information is completed when the decoder information reception completion flag is completed; Processing the position correction information in the case of the position correction information and checking whether the machining is completed; Displaying the position correction information processing completion flag as completed when the completion is completed and inspecting the next flag, and checking the next flag when the processing is not completed; DGPS information data processing unit built-in high precision GPS chipset using over-the-air additional broadcasting, characterized in that consisting of. The method of claim 2, Checking whether the GPS position information is completed and displaying the flag in the completed state, and if the completion state is completed, initializing the flag after transmitting the position information to the outside through the communication port (UART2, 28); Checking a flag to indicate whether the broadcast additional information is completed and transmitting the external information through the UART1 (27) to initialize the flag if it is completed; DGPS information using over-the-air supplementary broadcasting, characterized in that it is possible to process the GPS position information and the over-the-air broadcasting additional information with improved accuracy through the data processing process by repeating the flag inspection process at the same time. High precision GPS chipset with built-in data processor. The method of claim 1, In order to perform a high-precision positioning operation using the information first processed by the DGPS correction information data processor 62 and the GPS observation and data processor 66 mounted on one microprocessor 26 by the interrupt, Combining the carrier data 64 of the GPS reference point and the carrier observation data 67 of the GPS chipset received by the airborne additional broadcasting (68) to eliminate an error factor caused by the delay of the ion layer, and the pseudo distance using the carrier phase Determining an ambiguity constant which has a great influence on the determination precision and calculating a final pseudorange; Determining (70) the precise position of the GPS receiver after eliminating the cause of the first error of the GPS by using the precision orbital force (63) and additional correction information of the GPS satellite received by the above-mentioned additional air wave broadcasting; DGPS information data processing unit built-in high precision GPS chipset using over-the-air additional broadcasting, characterized in that consisting of.