Ephemeris extracting and loading device

Abstract

The ephemeris extracting and loading device comprises a receiving antenna and a casing, the receiving antenna is connected with a power divider through a radio frequency cable, the output end of the power divider is connected with a B1 / L1 receiver and a B3 receiver, the output end of the B1 / L1 receiver and the output end of the B3 receiver are both connected with a level adapter plate through lines, and the level adapter plate is connected with the power divider. A serial port of the level adapter plate is respectively connected with a DB9I connector and a DB9III connector; the output end of the level adapter plate is connected with an upper computer, and the power divider, the B1 / L1 receiver, the B3 receiver and the level adapter plate are all fixed in the machine shell. And a power supply module is fixedly connected in the shell and is respectively connected with the B1 / L1 receiver, the B3 receiver and the level adapter plate through lines. According to the utility model, the problems of poor satellite receiving effect and long first positioning time caused by different antenna gains of the existing terminal are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of satellite signal processing, and in particular relates to an ephemeris extraction and loading device. Background Art

[0002] The navigation signal transmitted from the satellite is very weak when it reaches the ground. The signal strength is about -130dBm, which is thousands of times lower than the noise. It is equivalent to the signal strength emitted by a 25W light bulb 16,000km away. The signal must be separated from the noise through the antenna and receiver through relevant receiving technology to complete the positioning.

[0003] Beidou / GPS satellite positioning terminals are widely used in all aspects of life. They use their receivers to provide location information. However, due to the varying gain of the terminals' built-in antennas, satellite reception is poor, resulting in a long time to first fix (TTFF), which brings significant inconvenience to testing and use. Utility Model Content

[0004] The utility model aims to provide an ephemeris extraction and loading device, which solves the problem that different antenna gains of existing terminals lead to poor satellite reception and long first positioning time.

[0005] The technical solution adopted by the utility model is that the ephemeris extraction and loading device includes a receiving antenna and a housing, the receiving antenna is connected to a power splitter via a radio frequency cable, one output end of the power splitter is connected to a B1 / L1 receiver, and the other output end is connected to a B3 receiver, the output ends of the B1 / L1 receiver and the B3 receiver are both connected to a level adapter board for communication between serial data and a computer via lines, and the serial port of the level adapter board is respectively connected to a DB9Ⅰ connector and a DB9Ⅲ connector for providing ephemeris data loading;

[0006] The output end of the level adapter board is connected to the host computer, and the power splitter, B1 / L1 receiver, B3 receiver and level adapter board are all fixed inside the casing; a power module is also fixedly connected inside the casing, and the power module is connected to the B1 / L1 receiver, B3 receiver and level adapter board through lines.

[0007] The utility model is also characterized in that:

[0008] The level adapter board includes a first FT4232 module and a second FT4232 module. The first FT4232 module and the second FT4232 module are both connected to the host computer through lines and are used to convert USB signals into TTL signals.

[0009] The first FT4232 module includes four serial ports. Serial port I and serial port II are connected to the telemetry and navigation information output by the B1 / L1 receiver respectively; serial port III is connected to the DB9Ⅰ connector, which is connected to an external GPSL1 / BDS B1 terminal with a TTL signal level; serial port IV is connected to a TTL-to-RS232Ⅰ module for converting TTL signals to RS232 levels, and the TTL-to-RS232Ⅰ module signal is connected to a DB9Ⅱ connector, which is connected to a GPS L1 / BDSB1 terminal with an RS232 signal level.

[0010] The second FT4232 module includes four serial ports. Serial port V and serial port VI are connected to the telemetry and navigation information output by the B3 receiver respectively; serial port VII is connected to the DB9Ⅲ connector, which is connected to an external BDS B3 terminal with a TTL signal level; serial port VIII is connected to a TTL-to-RS232Ⅱ module for converting TTL signals to RS232 levels, which is connected to a DB9Ⅳ connector, which is connected to a BDS B3 terminal with an RS232 signal level.

[0011] The receiving antenna includes an antenna array and a low-noise amplifier module. The antenna array is a four-in-one dual-feed point antenna array for GPS L1, GLONASS L1, BDS B1, BDS B3, and Galileo E1. The low-noise amplifier module includes a dielectric filter, a first LNA, a surface acoustic wave filter, a second LNA, and a π-type attenuator connected in sequence. The antenna array is connected to the dielectric filter, and the π-type attenuator is connected to the power divider.

[0012] The B1 / L1 receiver includes a combiner / power splitter unit, which is connected to the power splitter. The combiner / power splitter unit is connected to the first filter, RF channel a, the first A / D conversion module, the first baseband chip and the first memory in sequence through lines. The output end of the first baseband chip is connected to the first RS232 transceiver, and the first RS232 transceiver is connected to the level adapter board.

[0013] The B3 receiver includes a second filter, which is connected to the power divider. The second filter is connected to the RF channel b, the second A / D conversion module, the second baseband chip and the second memory in sequence through lines. The output end of the second baseband chip is connected to the second RS232 transceiver, and the second RS232 transceiver is connected to the level adapter board.

[0014] The power module is a DC / DC power module. The output terminal a of the power module is connected to a push button switch a. The other end of the push button switch a is connected to the B1 / L1 receiver. The output terminal b of the power module is connected to a push button switch b. The push button switch b is connected to the B3 receiver.

[0015] The beneficial effects of the present utility model are:

[0016] (1) The ephemeris extraction and loading device of the utility model receives satellite signals through the GPS L1, GLONASS L1, BDS B1, BDS B3, and Galileo E1 four-star multi-frequency satellite receiving antenna, and sends them to the receiver to complete the capture, tracking, bit synchronization, frame synchronization, and telegram decoding of the satellite signals. Finally, the demodulated data and the observation data are subjected to PVT solution, and the solved telegram data is saved in the computer to realize the extraction of ephemeris data. At the same time, it is connected to the terminal through the RS232 interface to realize the loading of the terminal's ephemeris data, thereby shortening the terminal's positioning time.

[0017] (2) The ephemeris extraction and loading device of the utility model supports BDS B1, BDS B3, and GPS L1, has a modular design and flexible assembly, can download BDS B1, BDS B3, and GPS L1 ephemeris data, and provide the latest ephemeris data for GPS L1, BDS B1, BDS B3 and other terminals, shortening the TTFF time of the terminal and enabling the terminal to achieve rapid positioning; the internal integrated TTL to RS232 circuit and the external DB9 connector can be used as a level conversion tool, which has good practicality and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the ephemeris extraction and loading device of the utility model;

[0019] Figure 2 This is a structural block diagram of the low noise amplifier module in the utility model;

[0020] Figure 3 It is a structural block diagram of the B1 / L1 receiver in the present utility model;

[0021] Figure 4 This is a block diagram of the BDS B3 receiver in the present utility model;

[0022] Figure 5 It is a structural block diagram of the medium-level adapter board of the utility model.

[0023] In the figure, 1. receiving antenna, 2. power splitter, 3. B1 / L1 receiver, 4. B3 receiver, 5. level adapter board, 6. host computer, 7. power module, 8. push button switch a, 9. push button switch b, 10. dielectric filter, 11. first LNA, 12. surface acoustic wave filter, 13. second LNA, 14. π-type attenuator, 15. first filter, 16. first A / D conversion module, 17. first baseband chip, 18. first RS232 transceiver, 19. first memory, 20. second filter, 21. second A / D conversion module, 22. second baseband chip, 23. second RS232 transceiver, 24. second memory, 25. first FT4232 module, 26. second FT4232 module. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example 1

[0026] The utility model of the ephemeris extraction and loading device is as follows Figure 1 As shown, it includes a receiving antenna 1 and a housing. The receiving antenna 1 is connected to a power splitter 2 via a radio frequency cable. One output end of the power splitter 2 is connected to a B1 / L1 receiver 3, and the other output end is connected to a B3 receiver 4. The output ends of the B1 / L1 receiver 3 and the B3 receiver 4 are both connected to a level adapter board 5 for communication between serial data and a computer through lines. The serial port of the level adapter board 5 is respectively connected to a DB9Ⅰ connector and a DB9Ⅲ connector for providing ephemeris data loading.

[0027] The output end of the level adapter board 5 is connected to the host computer 6, and the power divider 2, B1 / L1 receiver 3, B3 receiver 4 and level adapter board 5 are all fixed inside the casing; a power supply module 7 is also fixedly connected inside the casing, and the power supply module 7 is connected to the B1 / L1 receiver 3, B3 receiver 4 and level adapter board 5 through lines respectively, providing corresponding voltages for the B1 / L1 receiver 3, B3 receiver 4 and level adapter board 5.

[0028] Furthermore, the housing, consisting of a shell and lower cover, is constructed from 5A06-H112 aluminum. The shell features a serrated heat sink and a raised hot spot inside the shell to dissipate heat from the USB-to-serial converter and receiver. The lower cover is equipped with four powerful magnets to ensure adhesion to iron surfaces.

[0029] Furthermore, the software of the host computer consists of a navigation unit, a telemetry unit, an ephemeris extraction unit, and an ephemeris binding unit, and the quality of the satellite data can be intuitively observed using a visual interface.

[0030] The power module 7 is a DC / DC power module. The 5V output from the portable power supply (power bank) or 5V 2A power adapter is converted into 3 3.3V outputs through 3 LDOs. The output end c supplies power to the level adapter board 5. The output end a supplies power to the B1 / L1 receiver 3 through the button switch a8. The output end b supplies power to the B3 receiver 4 through the button switch b9.

[0031] Furthermore, output terminal a of power module 7 is connected to push button switch a8, the other end of which is connected to B1 / L1 receiver 3. Output terminal b is connected to push button switch b9, the other end of which is connected to the power input terminal of B3 receiver 4. Furthermore, push button switch a8 and push button switch b9 are respectively mounted on both sides of the housing.

[0032] Furthermore, if Figure 2 As shown, receiving antenna 1 includes an antenna element and a low-noise amplifier module. The antenna element is a four-in-one dual-feed antenna element for GPS L1, GLONASS L1, BDS B1, BDS B3, and Galileo E1. The low-noise amplifier module includes a dielectric filter 10, a first LNA 11, a surface acoustic wave filter 12, a second LNA 13, and a π-type attenuator 14 connected in sequence. The antenna element is connected to dielectric filter 10, and π-type attenuator 14 is connected to power divider 2. The output RF signal is connected to the input of power divider 2 via an RF connector and an RF cable.

[0033] Example 2

[0034] On the basis of Example 1, Figure 3 As shown, in this embodiment, the B1 / L1 receiver 3 includes a combiner / splitter unit connected to the power splitter 2. The RF signal output by the power splitter 2 is input to the combiner / splitter unit of the B1 / L1 receiver 3. The combiner / splitter unit is sequentially connected to a first filter 15, RF channel a, a first A / D conversion module 16, a first baseband chip 17, and a first memory 19 via circuits. The output end of the first baseband chip 17 is connected to a first RS232 transceiver 18, which is connected to the level adapter board 5. The 5V power input from the push button switch a8 is converted to 3.3V, 2.5V, and 1.0V by the power module 7, respectively, to provide the corresponding voltages for various components of the B1 / L1 receiver 3.

[0035] like Figure 4As shown, B3 receiver 4 includes a second filter 20, which is connected to power divider 2. The RF signal output by power divider 2 is input to B3 receiver 4. Second filter 20 is sequentially connected to RF channel b, second A / D conversion module 21, second baseband chip 22, and second memory 24 via circuits. The output end of second baseband chip 22 is connected to second RS232 transceiver 23, which is connected to level adapter board 5. The 5V power input from push button switch b9 is converted to 3.3V, 2.5V, and 1.0V by power module 7, providing the corresponding voltages for various components of B3 receiver 4.

[0036] Furthermore, RF channel a and RF channel b are used for down-conversion processing. The first baseband chip 17 and the second baseband chip 22 are used for performing PVT calculation.

[0037] Example 3

[0038] On the basis of Example 2, Figure 5 As shown, the level adapter board 5 of this embodiment includes a first FT4232 module 25 and a second FT4232 module 26. The first FT4232 module 25 and the second FT4232 module 26 are both connected to the host computer 6 through lines. The serial data input / output from the host computer 6 are converted by the first FT4232 module 25 and the second FT4232 module 26 respectively, and the USB signal is converted into a TTL signal.

[0039] The first FT4232 module 25 includes four serial ports. Serial port I and serial port II are connected to the telemetry and navigation information output by the B1 / L1 receiver 3 respectively; serial port III is connected to the DB9I connector, which is connected to an external GPS L1 / BDS B1 terminal with a TTL signal level; serial port IV is connected to a TTL-to-RS232I module for converting TTL signals to RS232 levels, and the TTL-to-RS232I module signal is connected to a DB9II connector, which is connected to a GPS L1 / BDS B1 terminal with an RS232 signal level.

[0040] The second FT4232 module 26 includes four serial ports, serial port V and serial port VI are respectively connected to the telemetry and navigation information output by the B3 receiver 4; serial port VII is connected to the DB9Ⅲ connector, and the DB9Ⅲ connector is connected to an external BDSB3 terminal with a TTL signal level; serial port VIII is connected to a TTL to RS232Ⅱ module for converting TTL signals to RS232 levels, and the TTL to RS232Ⅱ module is connected to a DB9Ⅳ connector, and the DB9Ⅳ connector is connected to a BDS B3 terminal with an RS232 signal level.

[0041] When the utility model is in use, the receiving antenna 1 receives the satellite signal and converts it into an electrical signal. The signal is divided into two paths through the power divider 2, one path is sent to the B1 / L1 receiver 3, and the other path is sent to the B3 receiver 4. The telemetry and navigation data output after being processed by the B1 / L1 receiver 3 are respectively connected to the serial port I and serial port II of the level adapter board 5, and the serial port III of the level adapter board 5 is connected to the DB9Ⅰ connector, which can be connected to the GPS L1 and BDS B1 terminals to provide loading of ephemeris data; the telemetry and navigation signals output after being processed by the BDS B3 receiver 4 are respectively connected to the serial port V and serial port VI of the level adapter board 5, and the serial port VII of the level adapter board 5 is connected to the DB9Ⅲ, which can be connected to the BDS B3 terminal to provide loading of ephemeris data, and the USB interface of the level adapter board 5 is connected to the host computer 6 through a data cable.

Claims

1. An ephemeris extraction and loading device, characterized in that: The invention comprises a receiving antenna (1) and a housing, wherein the receiving antenna (1) is connected to a power splitter (2) via a radio frequency cable, one output end of the power splitter (2) is connected to a B1 / L1 receiver (3), and the other output end is connected to a B3 receiver (4), the output ends of the B1 / L1 receiver (3) and the B3 receiver (4) are both connected to a level transfer board (5) for communication between serial data and a computer via a line, and the serial port of the level transfer board (5) is respectively connected to a DB9 I connector and a DB9 III connector for providing ephemeris data loading; The output end of the level transfer board (5) is connected to a host computer (6); the power divider (2), the B1 / L1 receiver (3), the B3 receiver (4) and the level transfer board (5) are all fixed inside the housing; a power module (7) is also fixedly connected inside the housing; the power module (7) is respectively connected to the B1 / L1 receiver (3), the B3 receiver (4) and the level transfer board (5) through lines.

2. The ephemeris extraction and loading device according to claim 1, characterized in that: The level transfer board (5) comprises a first FT4232 module (25) and a second FT4232 module (26), wherein the first FT4232 module (25) and the second FT4232 module (26) are both connected to the host computer (6) via a line and are used to convert USB signals into TTL signals.

3. The ephemeris extraction and loading device according to claim 2, characterized in that: The first FT4232 module (25) includes four serial ports, wherein serial port I and serial port II are respectively connected to the telemetry and navigation information output by the B1 / L1 receiver (3); Serial port III is connected to the DB9 I connector, and the DB9 I connector is connected to an external GPS L1 / BDS B1 terminal with a TTL signal level; Serial port IV is connected to a TTL to RS232 I module for converting TTL signals to RS232 levels. The TTL to RS232 I module signal is connected to a DB9 II connector. The DB9 II connector is connected to a GPS L1 / BDS B1 terminal with an RS232 signal level.

4. The ephemeris extraction and loading device according to claim 2, characterized in that: The second FT4232 module (26) includes four serial ports, wherein the serial ports V and VI are connected to the telemetry and navigation information output by the B3 receiver (4) respectively; the serial port VII is connected to the DB9III connector, and the DB9III connector is connected to an external BDS B3 terminal with a TTL signal level; Serial port VIII is connected to a TTL to RS232 II module for converting TTL signals to RS232 levels. The TTL to RS232 II module is connected to a DB9 IV connector. The DB9 IV connector is connected to a BDS B3 terminal with an RS232 signal level.

5. The ephemeris extraction and loading device according to claim 1, characterized in that: The receiving antenna (1) comprises an antenna array and a low noise amplifier module, wherein the antenna array is a four-in-one dual-feed point antenna array for GPS L1, GLONASS L1, BDS B1, BDS B3, and Galileo E1; the low noise amplifier module comprises a dielectric filter (10), a first LNA (11), a surface acoustic wave filter (12), a second LNA (13), and a π-type attenuator (14) connected in sequence, the antenna array is connected to the dielectric filter (10), and the π-type attenuator (14) is connected to the power divider (2).

6. The ephemeris extraction and loading device according to claim 1, characterized in that: The B1 / L1 receiver (3) includes a combiner / power splitter unit, which is connected to the power splitter (2). The combiner / power splitter unit is sequentially connected to a first filter (15), a radio frequency channel a, a first A / D conversion module (16), a first baseband chip (17), and a first memory (19) through lines. The output end of the first baseband chip (17) is connected to a first RS232 transceiver (18), and the first RS232 transceiver (18) is connected to the level adapter board (5).

7. The ephemeris extraction and loading device according to claim 1, characterized in that: The B3 receiver (4) includes a second filter (20), the second filter (20) is connected to the power divider (2), the second filter (20) is sequentially connected to the radio frequency channel b, the second A / D conversion module (21), the second baseband chip (22) and the second memory (24) through lines, the output end of the second baseband chip (22) is connected to the second RS232 transceiver (23), and the second RS232 transceiver (23) is connected to the level adapter board (5).

8. The ephemeris extraction and loading device according to claim 1, characterized in that: The power supply module (7) is a DC / DC power supply module. The output end a of the power supply module (7) is connected to a button switch a (8), the other end of which is connected to the B1 / L1 receiver (3). The output end b of the power supply module (7) is connected to a button switch b (9), which is connected to the B3 receiver (4).

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