Dual-output high-precision vehicle-mounted GNSS antenna

Abstract

The utility model discloses a dual-output high-precision vehicle-mounted GNSS (Global Navigation Satellite System) antenna, and relates to the technical field of positioning antennas. The receiving unit comprises a first microstrip patch, a second microstrip patch, an L1 antenna feed network, an L2 antenna feed network, an L1 prefilter, an L2 prefilter, an L1 pre-amplifier, an L2 pre-amplifier, an L1 filter, an L2 filter, a pilot frequency combiner circuit, a final amplifier, a splitter, a power switching circuit, a first switch, a second switch, a first connector and a second connector. The first microstrip patch is arranged above the second microstrip patch, and the L1 antenna feed network and the L2 antenna feed network are connected to the second microstrip patch. The device can realize miniaturization, expand the impedance bandwidth of the antenna, realize the reception of multi-constellation satellites and low-elevation satellites of the antenna, and meet the requirements of a high-precision inertial navigation module on the antenna.

Description

Technical Field

[0001] The utility model relates to the technical field of positioning antennas, in particular to a dual-output high-precision vehicle-mounted GNSS antenna. Background Art

[0002] With the deployment of 5G and Beidou, autonomous driving applications are becoming increasingly widespread. For autonomous vehicles at level 3 and above, high-precision positioning is an essential foundational technology. High-precision GNSS positioning, in particular, significantly improves positioning accuracy and stability in a variety of complex environments and is gradually becoming a focus of attention in the autonomous driving field. For vehicles at level 3 and above, because control of the vehicle must be partially or fully transferred to the system, positioning accuracy must reach the centimeter level to achieve the highest possible safety. Different application scenarios also have different positioning technology requirements. Therefore, antennas must possess excellent phase center stability to enhance high-precision signal reception.

[0003] However, in the existing technology, the antenna output is single. Traditional antennas have only one output port, and one antenna can only be connected to one inertial navigation module or positioning receiving module. When different positioning modules need to be connected to high-precision antennas at the same time, the number of antennas can only be increased, which increases the cost of the antenna.

[0004] If an antenna uses an external power splitter to distribute the received signal to different positioning modules, the high insertion loss of the external power splitter will significantly degrade the antenna's RF performance, resulting in lower gain, poor satellite reception performance, and a reduced number of satellites. This makes it impossible to receive multi-frequency and multi-constellation signals, resulting in low navigation accuracy. Therefore, we propose a dual-output, high-precision, vehicle-mounted GNSS antenna to address these technical issues. Utility Model Content

[0005] In view of this, the present invention addresses the above-mentioned shortcomings, and its main purpose is to provide a dual-output high-precision vehicle-mounted GNSS antenna, which is used to solve the above-mentioned problems.

[0006] To achieve the above object, the present invention adopts the following technical solution: a receiving unit, the receiving unit including a first microstrip patch, a second microstrip patch, an L1 antenna feeding network, an L2 antenna feeding network, an L1 prefilter, an L2 prefilter, an L1 preamplifier, an L2 preamplifier, an L1 filter, an L2 filter, a different frequency combining circuit, a final amplifier, a splitter, a power switching circuit, a first switch, a second switch, a first connector and a second connector, the first microstrip patch is arranged above the second microstrip patch, the L1 antenna feeding network and the L2 antenna feeding network are connected to the second microstrip patch, the L1 prefilter is connected to the L1 antenna feeding network, and the L2 prefilter is connected to the L2 antenna. a line-fed network, the L1 preamplifier connected to the L1 prefilter, the L2 preamplifier connected to the L2 prefilter, the L1 filter connected to the L1 preamplifier, the L2 filter connected to the L2 preamplifier, the different-frequency combiner circuit connected to both the L1 filter and the L2 filter, the final amplifier connected to the different-frequency combiner circuit, the splitter connected to the final amplifier, the power switching circuit connected to the splitter, the first switch and the second switch respectively connected to the splitter, the first connector connected to the first switch, the second connector connected to the second switch, and the power switching circuit respectively connected to the first connector and the second connector;

[0007] An output unit includes a radio frequency signal, a pre-splitter, a first resistor, a second resistor, a first connector, a second connector, a third resistor, a fourth resistor, a first circuit breaker, a second circuit breaker, a fifth resistor, a first transistor, a second transistor, a third transistor, a fourth transistor, a sixth resistor, and a voltage-regulated output circuit. The radio frequency signal is connected to the pre-splitter, the first resistor and the second resistor are connected to the pre-splitter, the first connector and the second connector are connected to the second resistor and the first resistor, respectively, the fourth resistor and the third resistor are connected to the first connector and the second connector, respectively, the first circuit breaker and the second circuit breaker are connected to the fourth resistor and the third resistor, respectively, the first circuit breaker and the second circuit breaker are commonly connected to the fifth resistor, the first transistor and the second transistor are commonly connected to the fifth resistor, the fourth transistor is connected to the first transistor, the third transistor is connected to the second transistor, the third transistor and the fourth transistor are commonly connected to the sixth resistor, and the sixth resistor is connected to the voltage-regulated output circuit.

[0008] As a preferred solution, the first connector can detect a current ranging from 27 to 33 mA.

[0009] As a preferred solution, the second connector can detect a current range of 27 to 33 mA. When the first connector and the second connector are powered on at the same time, the first connector can detect a designed current of 27 to 33 mA, and the second connector can detect a current of 3 to 5 mA.

[0010] As a preferred solution, the L1 pre-amplifier is also connected to the voltage-stabilized output circuit.

[0011] As a preferred solution, the L2 pre-amplifier is connected to the voltage-stabilized output circuit.

[0012] As a preferred solution, the final amplifier is connected to the voltage-stabilized output circuit.

[0013] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0014] This device can achieve miniaturization, expand the impedance bandwidth of the antenna, realize the reception of multi-constellation satellites and low-elevation-angle satellites, and meet the antenna requirements of high-precision inertial navigation modules;

[0015] By designing a signal splitter circuit at the output end of the high-precision antenna, the antenna signal is distributed to different positioning modules. The splitter circuit has the characteristics of low insertion loss and high isolation.

[0016] Through the power switching circuit, two positioning modules can be powered at the same time or the antenna can work normally even if a single positioning module is powered.

[0017] In order to more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the connection of the receiving unit of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the output unit connection of an embodiment of the present utility model.

[0020] Explanation of the accompanying symbols: 1. RF signal; 2. splitter; 3. first resistor; 4. second resistor; 5. first connector; 6. second connector; 7. third resistor; 8. fourth resistor; 9. first circuit breaker; 10. second circuit breaker; 11. fifth resistor; 12. first transistor; 13. second transistor; 14. third transistor; 15. fourth transistor; 16. sixth resistor; 17. voltage-regulated output circuit; 18. first microstrip patch; 19. second microstrip patch; 20. L1 antenna feeding network; 21. L2 antenna feeding network; 22. L1 prefilter; 23. L2 prefilter; 24. L1 preamplifier; 25. L2 preamplifier; 26. L1 filter; 27. L2 filter; 28. frequency-combining circuit; 29. ​​final amplifier; 30. splitter; 31. power switching circuit; 32. first switch; 33. second switch. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0023] See also Figures 1 to 2 The present invention provides a dual-output high-precision vehicle-mounted GNSS antenna, comprising:

[0024] The receiving unit includes a first microstrip patch 18, a second microstrip patch 19, an L1 antenna feed network 20, an L2 antenna feed network 21, an L1 prefilter 22, an L2 prefilter 23, an L1 preamplifier 24, an L2 preamplifier 25, an L1 filter 26, an L2 filter 27, an inter-frequency combining circuit 28, a final amplifier 29, a splitter 30, a power switching circuit 31, a first switch 32, a second switch 33, a first connector 5 and a second connector 6. The first microstrip patch 18 is arranged above the second microstrip patch 19, the L1 antenna feed network 20 and the L2 antenna feed network 21 are connected to the second microstrip patch 19, the L1 prefilter 22 is connected to the L1 antenna feed network 20, and the L2 prefilter 23 is connected to the L2 antenna feeding network 21, L1 preamplifier 24 connected to L1 prefilter 22, L2 preamplifier 25 connected to L2 prefilter 23, L1 filter 26 connected to L1 preamplifier 24, L2 filter 27 connected to L2 preamplifier 25, inter-frequency combining circuit 28 connected to L1 filter 26 and L2 filter 27, final amplifier 29 connected to inter-frequency combining circuit 28, splitter 30 connected to final amplifier 29, power switching circuit 31 connected to splitter 30, first switch 32 and second switch 33 respectively connected to splitter 30, first connector 5 connected to first switch 32, second connector 6 connected to second switch 33, power switching circuit 31 respectively connected to first connector 5 and second connector 6;

[0025] The output unit includes a radio frequency signal 1, a pre-splitter 2, a first resistor 3, a second resistor 4, a first connector 5, a second connector 6, a third resistor 7, a fourth resistor 8, a first circuit breaker 9, a second circuit breaker 10, a fifth resistor 11, a first transistor 12, a second transistor 13, a third transistor 14, a fourth transistor 15, a sixth resistor 16, and a voltage-stabilized output circuit 17. The radio frequency signal 1 is connected to the pre-splitter 2, the first resistor 3 and the second resistor 4 are connected to the pre-splitter 2, and the first connector 5 and the second connector 6 are connected to the second resistor 4 and the first resistor 8, respectively. 3, the fourth resistor 8 and the third resistor 7 are connected to the first connector 5 and the second connector 6, respectively. The first circuit breaker 9 and the second circuit breaker 10 are connected to the fourth resistor 8 and the third resistor 7, respectively. The first circuit breaker 9 and the second circuit breaker 10 are commonly connected to the fifth resistor 11. The first triode 12 and the second triode 13 are commonly connected to the fifth resistor 11. The fourth triode 15 is connected to the first triode 12. The third triode 14 is connected to the second triode 13. The third triode 14 and the fourth triode 15 are commonly connected to the sixth resistor 16. The sixth resistor 16 is connected to the voltage-stabilized output circuit 17.

[0026] See also Figures 1 to 2The first microstrip patch 18 and the second microstrip patch 19 are respectively fed through coaxial power to the L2 antenna feeding network 21 and the L1 prefilter 22 for phase shifting, and then enter the L1 prefilter 22 and the L2 prefilter 23 for filtering, and then pass through the L1 preamplifier 24 with ultra-low noise and the L2 preamplifier 25 for the first stage amplification, and then enter the L1 filter 26 and the L2 filter 27 with high out-of-band suppression for filtering. The high and low frequency signals are separated by the L1 filter 26 and the L2 filter 27 and enter the different-frequency combining circuit 28 for combining. The combined signal passes through the final amplifier 29 to increase the signal gain to a signal suitable for use by the module, and then passes through the splitter 30 to transmit the signal to the first connector 5 and the second connector 6 for use.

[0027] If the antenna is connected only to the first connector 5, the first transistor 12 is turned off, the second transistor 13 is turned off, the third transistor 14 is turned off, and the fourth transistor 15 is turned on. Then, the voltage is supplied to the RF front-end LNA through the voltage-stabilized output circuit 17, so that the antenna can operate normally and transmit the antenna signal to the receiving unit for processing. The normally designed current that can be detected by the first connector 5 is 30±3 mA.

[0028] If the antenna is connected only to the second connector 6, the first transistor 12 is turned off, the second transistor 13 is turned off, the third transistor 14 is turned off, and the fourth transistor 15 is turned on. Then, the voltage is supplied to the RF front-end LNA through the voltage-stabilized output circuit 17, enabling the antenna to operate normally and transmitting the antenna signal to the receiving unit for processing. The second connector 6 can detect the normally designed current of 30±3mA. The RF front-end LNA is a low-noise amplifier, a key component in wireless communication systems, mainly used to amplify the received signal and reduce noise introduction.

[0029] If the antenna is connected to both the first connector 5 and the second connector 6, the first transistor 12 is turned off, the second transistor 13 is turned on, the third transistor 14 is turned on, and the fourth transistor 15 is turned on. The input voltage is selectively switched by the power switching circuit 31, allowing only the voltage from the first connector 5 to enter the RF LNA for powering, ensuring normal operation of the antenna. The signal is then transmitted to the second connector 6 and the first connector 5 for use via the splitter 30. At the same time, the first connector 5 can detect the designed current of 30±3mA, and the second connector 6 can detect the current of 4±1mA.

[0030] In summary, this device can achieve miniaturization, expand the impedance bandwidth of the antenna, realize the reception of multi-constellation satellites and low-elevation-angle satellites, and meet the antenna requirements of high-precision inertial navigation modules;

[0031] By designing a signal splitter circuit at the output end of the high-precision antenna, the antenna signal is distributed to different positioning modules. The splitter circuit has the characteristics of low insertion loss and high isolation.

[0032] Through the power switching circuit, two positioning modules can be powered at the same time or the antenna can work normally even if a single positioning module is powered.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dual-output high-precision vehicle-mounted GNSS antenna, characterized in that: include: A receiving unit comprising a first microstrip patch (18), a second microstrip patch (19), an L1 antenna feeding network (20), an L2 antenna feeding network (21), an L1 pre-filter (22), an L2 pre-filter (23), an L1 pre-amplifier (24), an L2 pre-amplifier (25), an L1 filter (26), an L2 filter (27), a different frequency combining circuit (28), a final amplifier (29), a splitter (30), a power supply switching circuit (31), a first switch ( 32), a second switch (33), a first connector (5) and a second connector (6), the first microstrip patch (18) is arranged above the second microstrip patch (19), the L1 antenna feeding network (20) and the L2 antenna feeding network (21) are connected to the second microstrip patch (19), the L1 prefilter (22) is connected to the L1 antenna feeding network (20), the L2 prefilter (23) is connected to the L2 antenna feeding network (21), the L1 prefilter (23) is connected to the L2 antenna feeding network (21), and the L1 prefilter (22) is connected to the L1 antenna feeding network (20). The first stage amplifier (24) is connected to the L1 pre-filter (22), the L2 pre-amplifier (25) is connected to the L2 pre-filter (23), the L1 filter (26) is connected to the L1 pre-amplifier (24), the L2 filter (27) is connected to the L2 pre-amplifier (25), the different frequency combining circuit (28) is connected to the L1 filter (26) and the L2 filter (27), and the final stage amplifier (29) is connected to the different frequency combining circuit (2 8), the splitter (30) is connected to the final amplifier (29), the power switching circuit (31) is connected to the splitter (30), the first switch (32) and the second switch (33) are respectively connected to the splitter (30), the first connector (5) is connected to the first switch (32), the second connector (6) is connected to the second switch (33), and the power switching circuit (31) is respectively connected to the first connector (5) and the second connector (6); An output unit, comprising a radio frequency signal (1), a pre-splitter (2), a first resistor (3), a second resistor (4), a third resistor (7), a fourth resistor (8), a first circuit breaker (9), a second circuit breaker (10), a fifth resistor (11), a first triode (12), a second triode (13), a third triode (14), a fourth triode (15), a sixth resistor (16), and a voltage-stabilizing output circuit (17), wherein the radio frequency signal (1) is connected to the pre-splitter (2), the first resistor (3) and the second resistor (4) are connected to the pre-splitter (2), the first connector (5) and the second connector (6) are connected to the second resistor (4) and the first resistor (3), respectively, the fourth resistor (8) and the third resistor ( 7) are respectively connected to the first connector (5) and the second connector (6), the first circuit breaker (9) and the second circuit breaker (10) are respectively connected to the fourth resistor (8) and the third resistor (7), the first circuit breaker (9) and the second circuit breaker (10) are commonly connected to the fifth resistor (11), the first triode (12) and the second triode (13) are commonly connected to the fifth resistor (11), the fourth triode (15) is connected to the first triode (12), the third triode (14) is connected to the second triode (13), the third triode (14) and the fourth triode (15) are commonly connected to the sixth resistor (16), and the sixth resistor (16) is connected to the voltage stabilization output circuit (17).

2. The dual-output high-precision vehicle-mounted GNSS antenna according to claim 1, characterized in that: The first connector (5) can detect a current ranging from 27 to 33 mA.

3. The dual-output high-precision vehicle-mounted GNSS antenna according to claim 1, characterized in that: The second connector (6) can detect a current range of 27 to 33 mA. When the first connector (5) and the second connector (6) are simultaneously in a power-on state, the first connector (5) can detect a designed current of 27 to 33 mA, and the second connector (6) can detect a current of 3 to 5 mA.

4. The dual-output high-precision vehicle-mounted GNSS antenna according to claim 1, characterized in that: The L1 pre-amplifier (24) is also connected to the voltage-stabilizing output circuit (17).

5. The dual-output high-precision vehicle-mounted GNSS antenna according to claim 4, characterized in that: The L2 pre-amplifier (25) is connected to the voltage-stabilized output circuit (17).

6. The dual-output high-precision vehicle-mounted GNSS antenna according to claim 1, characterized in that: The final amplifier (29) is connected to the voltage-stabilizing output circuit (17).

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