Satellite signal receiving device and satellite positioning vehicle-mounted terminal

Abstract

The utility model discloses a satellite signal receiving device and a satellite positioning vehicle-mounted terminal, and relates to the field of satellite terminals. The satellite signal receiving device comprises an antenna device which comprises a first antenna unit and a second antenna unit, the first antenna unit and the second antenna unit are configured to be capable of independently receiving electromagnetic wave signals from a satellite or the ground, and an included angle is formed between the first antenna unit and the second antenna unit; and a satellite positioning module, wherein the first antenna unit and the second antenna unit are electrically connected with the satellite positioning module. According to the utility model, the first antenna unit and the second antenna unit which form the included angle with each other are arranged to receive signals, then the satellite positioning module judges signal sources according to the signals received by the first antenna unit and the second antenna unit, and only the signals of which the signal sources are satellites are sent to the vehicle-mounted recording device to be stored. Therefore, the time service accuracy of the vehicle-mounted recording device is improved, and an anti-cheating function is realized.

Description

Technical Field

[0001] This utility model relates to the field of satellite terminal equipment technology, specifically to a satellite signal receiving device and a satellite positioning vehicle terminal. Background Technology

[0002] Currently, all car dashcams on the market are equipped with a Beidou positioning module. The Beidou positioning module receives satellite signals through a single antenna and uses the received satellite time information to calibrate the dashcam's clock.

[0003] However, BeiDou positioning modules, which rely on a single antenna to receive satellite signals, are vulnerable to spoofing. Attackers can use forged simulated satellite signals to interfere with the BeiDou positioning module, thereby arbitrarily altering the time recorded on the dashcam. This time tampering severely reduces the credibility of the dashcam's time, resulting in inaccurate timestamps on the recorded data, which in turn affects law enforcement agencies' trust in and the validity of the evidence.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] Purpose of this utility model: The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a satellite signal receiving device and a satellite positioning vehicle terminal, which can prevent spoofing and improve the time synchronization accuracy of the vehicle recording device.

[0006] To solve the above-mentioned technical problems, this utility model discloses a satellite signal receiving device, which includes:

[0007] The antenna device includes a first antenna element and a second antenna element, the first antenna element and the second antenna element being configured to independently receive electromagnetic wave signals from a satellite or the ground, and forming an angle between them;

[0008] And a satellite positioning module, wherein the first antenna unit and the second antenna unit are electrically connected to the satellite positioning module.

[0009] Specifically, the angle formed between the first antenna element and the second antenna element is adjustable.

[0010] Specifically, the top end of the first antenna unit and the top end of the second antenna unit are hinged to each other via a hinge axis, and the first antenna unit and the second antenna unit are configured to be able to rotate around the hinge axis to adjust the included angle.

[0011] Specifically, the antenna device includes an angle adjustment mechanism, which includes:

[0012] Base for connection with the vehicle body structure;

[0013] A lead screw is rotatably mounted on the base, and one end of the lead screw away from the base is connected to the hinge shaft;

[0014] The system also includes a bidirectional sliding structure, comprising a mounting base threadedly connected to the lead screw, a first telescopic end hinged to the first antenna unit, and a second telescopic end hinged to the second antenna unit. The mounting base is threadedly connected to the lead screw. The first telescopic end and the second telescopic end are located on both sides of the mounting base and are respectively disposed opposite to the mounting base. The first telescopic end and the second telescopic end are telescopically oriented in the direction of approaching or moving away from the mounting base.

[0015] Specifically, the bidirectional sliding member structure includes a first sliding member and a second sliding member. The mounting base forms a first sliding cavity and a second sliding cavity. The first sliding member includes two ends arranged opposite to each other along its length direction, one end of which is slidably sleeved in the first sliding cavity, and the other end of which defines a first telescopic end of the bidirectional sliding member structure. The second sliding member includes two ends arranged opposite to each other along its length direction, one end of which is slidably sleeved in the second sliding cavity, and the other end of which defines a second telescopic end of the bidirectional sliding member structure.

[0016] Specifically, the bidirectional sliding member structure includes a first elastic element and a second elastic element. The first elastic element connects the first sliding member and the mounting base, and is used to apply an elastic force to the first sliding member pointing towards the lead screw. The second elastic element connects the second sliding member and the mounting base, and is used to apply an elastic force to the second sliding member pointing towards the lead screw.

[0017] Specifically, the lead screw is threaded with a nut, and the mounting base is threadedly connected to the lead screw by connecting the nut.

[0018] Specifically, the hinge shaft is arranged perpendicular to the lead screw.

[0019] Specifically, the device includes a motor for driving the lead screw.

[0020] Specifically, the antenna device is an external antenna device; the external antenna device is connected to the satellite positioning module via an antenna feed line.

[0021] A second aspect of this invention provides a satellite positioning vehicle-mounted terminal, including a vehicle-mounted recording device and the aforementioned satellite signal receiving device. The satellite positioning module of the satellite signal receiving device is electrically connected to the vehicle-mounted recording device.

[0022] Beneficial effects:

[0023] 1. This utility model provides a satellite signal receiving device, which receives signals by setting a first antenna unit and a second antenna unit that form an angle with each other. Then, the satellite positioning module determines the source of the signal based on the signals received by the first antenna unit and the second antenna unit, and only sends the signals whose source is a satellite to the vehicle recording device for storage, thereby improving the time synchronization accuracy of the vehicle recording device and realizing the anti-spoofing function.

[0024] 2. In one embodiment of this utility model, the included angle is adjustable. By adjusting the angle of the satellite antenna, both antennas can receive satellite signals of sufficient strength. This avoids the situation where, when the satellite signal strength is weak, one antenna unit may not be able to receive the satellite signal, thus making it impossible to compare the signals received by the two antenna units. Attached Figure Description

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.

[0026] Figure 1 A schematic diagram of the structure of a satellite signal receiving device provided in one embodiment of this utility model. Figure 1 ;

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of a satellite signal receiving device is shown. Figure 2 ;

[0028] Figure 3 for Figure 1 The principle block diagram of the satellite positioning vehicle terminal.

[0029] The accompanying figure labels are explained as follows:

[0030] 100, Antenna assembly; 110, First antenna element; 120, Second antenna element; 130, Hinge shaft; 140, Base; 150, Lead screw; 160, Mounting seat; 170, First sliding member; 171, First telescopic end; 180, Second sliding member; 181, Second telescopic end; 190, Nut; 200, Antenna feed line; 300, Satellite positioning module; α, Angle. Detailed Implementation

[0031] Satellite positioning modules that rely on a single antenna element to receive satellite signals are vulnerable to spoofing. Attackers can use forged simulated satellite signals to interfere with the satellite positioning module, thereby arbitrarily altering the time displayed on the dashcam. This time tampering severely reduces the credibility of the dashcam's time, causing inaccurate timestamps on the recorded data, which in turn affects law enforcement agencies' trust in and the validity of the evidence. The aforementioned satellites could be those constituting China's BeiDou Navigation Satellite System (BDS) or those constituting the Global Positioning System (GPS).

[0032] Therefore, the first aspect of this utility model provides a satellite signal receiving device, which includes an antenna device 100 and a satellite positioning module 300.

[0033] Combination Figure 1 As shown, the antenna device 100 includes a first antenna element 110 having a first antenna body and a second antenna element 120 having a second antenna body. The first antenna element 110 and the second antenna element 120 are configured to independently receive electromagnetic wave signals from a satellite or the ground, and an included angle α is formed between them.

[0034] Combination Figure 1 As shown, the first antenna unit 110 and the second antenna unit 120 are electrically connected to the satellite positioning module 300. The satellite positioning module 300 can determine the signal source based on the signals received by the first antenna unit 110 and the second antenna unit 120, and only send signals whose source is a satellite to the vehicle recording device 400 for storage.

[0035] The principle of this utility model's satellite positioning module 300 in identifying single-point sources and satellite signal transmission sources is as follows:

[0036] Currently, satellite signals in the air originate from multiple satellite transmitters. These signals are received by a dual-antenna unit formed by two satellites at an angle. The signals are then analyzed by the positioning module to obtain clock information, position information, azimuth angle, and signal strength for each satellite. Since different satellite transmitters are located in different orbits, the signal strength and azimuth angle of the actual satellite signals arriving at the same antenna unit are inconsistent. This is reflected in the MCU analysis results of the satellite positioning module 300, where the multiple actual satellite signals received by the antenna unit have multiple different satellite numbers and inconsistent signal strengths.

[0037] For a single real satellite signal emitted from the same satellite transmitter, for the first and second antenna elements at an angle, the received signals have the same satellite number, but due to the angle, the signal strength differs. This difference is reflected in the MCU analysis result of the satellite positioning module 300; that is, the antenna element facing the transmitter receives a stronger real satellite signal than the antenna element facing away from the transmitter. For multiple satellite transmitters, some face the first antenna element and some face away from it, causing a difference in signal strength between the two antenna elements. This difference means that when a satellite transmitter corresponding to a certain satellite number is facing the first antenna element, the first antenna element receives a stronger signal than the second antenna element, while when a satellite transmitter corresponding to another satellite number is facing the second antenna element, the second antenna element receives a stronger signal than the first antenna element.

[0038] In contrast, the counterfeit analog signals are often sourced from a single point due to technological limitations. The signals spoofed from this single point source originate from the same interference source, and their propagation paths are relatively fixed. Therefore, the analysis results from the satellite positioning module 300 show that the fake satellite numbers and azimuth angles in the multiple spoofing signals received by different antenna elements are consistent. Furthermore, for the same antenna element, the different spoofing signals it receives have essentially the same signal strength. Because it is a single point source, the single point source is either directly facing the first antenna element or the second antenna element. Therefore, in the MCU analysis results of the satellite positioning module 300, the overall strength of the multiple spoofing signals received by one antenna element is weaker than that received by the other antenna element.

[0039] By utilizing the differences in satellite numbering and signal strength between multiple spoof signals and multiple real satellite signals in the MCU analysis results, the satellite positioning module 300 can distinguish whether the signal received by the antenna device 100 originates from a real satellite or a single point source, and only sends signals originating from satellites to the vehicle recording device 400 for storage, thereby improving the timing accuracy of the vehicle recording device 400.

[0040] Example 1

[0041] In this embodiment, the angle between the first antenna unit 110 and the second antenna unit 120 is a fixed angle α, with a value ranging from 60° to 150°. In a specific embodiment, the angle is 90°. When the first antenna unit 110 and the second antenna unit 120 simultaneously receive multiple satellite signals, the different installation angles of the two antenna units result in differences in the strength of the satellite signals received by the two antenna units. Specifically, after the signals received by the first antenna unit 110 (facing the satellite signal source) and the second antenna unit 120 (facing away from the satellite signal source) are analyzed by the MCU in the satellite positioning module 300, the strength of the multiple satellite signals received by the first antenna unit 110 (facing the satellite signal source) is greater than that received by the second antenna unit 120 (facing away from the satellite signal source). By comparing the signal strength, the satellite positioning module 300 can determine that the received satellite signals are real satellite signals, and further analyze the location information, clock information, and related information of the multiple satellite signals.

[0042] Example 2

[0043] While satellite signal receivers with a fixed angle can prevent spoofing, the fixed angle of the satellite antenna means that one antenna may fail to receive the signal when the satellite signal strength is weak, making it impossible to compare the signals received by the two antennas. By adjusting the angle of the satellite antenna, both antennas can receive a sufficiently strong satellite signal.

[0044] Therefore, unlike the fixed included angle in Embodiment 1, in this embodiment, the included angle α formed between the first antenna unit 110 and the second antenna unit 120 is adjustable, and the adjustment range of the angle is 60°-150°.

[0045] Combination Figure 1 As shown, the top of the first antenna unit 110 and the top of the second antenna unit 120 are hinged to each other via a hinge shaft 130, and the first antenna unit 110 and the second antenna unit 120 are configured to be able to rotate around the hinge shaft 130 to adjust the included angle α.

[0046] Combination Figure 1 As shown, the satellite signal receiving device in this embodiment includes an angle adjustment mechanism, which includes a base 140 for connecting to the vehicle body structure, a lead screw 150, and a bidirectional sliding member structure.

[0047] The lead screw 150 is rotatably mounted on the base 140, and the end of the lead screw 150 away from the base 140 is connected to the hinge shaft 130. In other words, when the lead screw 150 rotates, the relative position of the lead screw 150 and the hinge shaft 130 remains unchanged.

[0048] The bidirectional sliding member structure includes a mounting base 160 threadedly connected to a lead screw 150, a first telescopic end 171 hinged to a first antenna unit 110, and a second telescopic end 181 hinged to a second antenna unit 120. The mounting base 160 is threadedly connected to the lead screw 150. The first telescopic end 171 and the second telescopic end 181 are located on both sides of the mounting base 160 and are both opposite to the mounting base 160. The first telescopic end 171 and the second telescopic end 181 are telescopically oriented in the direction of approaching or moving away from the mounting base 160.

[0049] Combination Figure 2 As shown, the bidirectional sliding member structure includes a first sliding member 170 and a second sliding member 180. The mounting base 160 forms a first sliding cavity and a second sliding cavity. The first sliding member 170 includes two ends arranged opposite to each other along its length direction, one end of which is slidably sleeved in the first sliding cavity, and the other end defines a first telescopic end 171 of the bidirectional sliding member structure. The second sliding member 180 includes two ends arranged opposite to each other along its length direction, one end of which is slidably sleeved in the second sliding cavity, and the other end defines a second telescopic end 181 of the bidirectional sliding member structure.

[0050] The extendable stroke of the first slider 170 and the second slider 180, together with the lifting stroke of the mounting base 160 along the lead screw 150, define the adjustable range of the included angle α.

[0051] The first slider 170 and the second slider 180 can be rod-shaped parts with a circular or square cross-section.

[0052] It should be understood that the bidirectional sliding member structure includes a first elastic element and a second elastic element. The first elastic element connects the first sliding member 170 and the mounting base 160, and is used to apply an elastic force pointing towards the lead screw 150 to the first sliding member 170. The second elastic element connects the second sliding member 180 and the mounting base 160, and is used to apply an elastic force pointing towards the lead screw 150 to the second sliding member 180. The first and second elastic elements are not shown in the figure.

[0053] Mounting bracket 160 is threadedly connected to lead screw 150. Specifically, in combination with Figure 2 As shown, the lead screw 150 is threadedly connected to the nut 190, and the mounting base 160 is fixedly connected to the nut 190, so that the mounting base 160 and the lead screw 150 are threadedly connected.

[0054] Combination Figure 2 As shown, the hinge shaft 130 is arranged perpendicularly to the lead screw 150. The extension and retraction directions of the first telescopic end 171 and the second telescopic end 181 relative to the mounting base 160 are perpendicular to the lead screw 150. In a particular embodiment, the lead screw 150 is arranged in a vertical direction.

[0055] It should be understood that the satellite signal receiving device includes a motor for driving the lead screw 150. The motor can directly or indirectly drive the lead screw 150.

[0056] The antenna devices in the above embodiments can all be configured as either built-in or external.

[0057] Specifically, combined Figure 2 As shown, when the antenna device 100 is an external antenna device, the mounting base 160 of the antenna device 100 is fixedly installed on the vehicle body structure and located on the outside of the vehicle body structure. The satellite positioning module 300 is installed on the inside of the vehicle body structure. The external antenna device 100 can be connected to the satellite positioning module 300 via the antenna feed line 200.

[0058] Example 3

[0059] Unlike Embodiment 2, which uses a bidirectional sliding structure to simultaneously rotate the first antenna unit 110 and the second antenna unit 120 around the hinge axis 130, this embodiment can use a unidirectional sliding structure, which has only one of the first telescopic end 171 and the second telescopic end 181. For example, only the first telescopic end 171 is provided, and the first antenna unit 110 is rotated through the telescopic end 171 to change the angle between the first antenna unit 110 and the second antenna unit 120, so that the second antenna unit 120 and the base 140 remain relatively stationary.

[0060] A second aspect of this utility model provides a satellite positioning vehicle terminal, including a vehicle recording device 400 and the aforementioned satellite signal receiving device. The satellite positioning module 300 of the satellite signal receiving device is electrically connected to the vehicle recording device 400.

[0061] This utility model provides a concept and method for a satellite signal receiving device and a satellite positioning vehicle-mounted terminal. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A satellite signal receiving device, characterized in that, include: The antenna device (100) includes a first antenna element (110) and a second antenna element (120), the first antenna element (110) and the second antenna element (120) being configured to independently receive electromagnetic wave signals from a satellite or the ground, and forming an angle between them; And a satellite positioning module (300), wherein the first antenna unit (110) and the second antenna unit (120) are electrically connected to the satellite positioning module (300).

2. The satellite signal receiving device according to claim 1, characterized in that, The angle formed between the first antenna element (110) and the second antenna element (120) is adjustable.

3. The satellite signal receiving device according to claim 2, characterized in that, The top end of the first antenna unit (110) and the top end of the second antenna unit (120) are hinged to each other via a hinge axis (130), and the first antenna unit (110) and the second antenna unit (120) are configured to be able to rotate about the hinge axis (130) to adjust the included angle.

4. The satellite signal receiving device according to claim 3, characterized in that, The antenna device (100) includes an angle adjustment mechanism, the angle adjustment mechanism comprising: Base (140) for connection with the vehicle body structure; A lead screw (150) is rotatably mounted on the base (140), and one end of the lead screw (150) away from the base (140) is connected to the hinge shaft (130); The bidirectional sliding structure includes a mounting base (160) threadedly connected to the lead screw (150), a first telescopic end (171) hinged to the first antenna unit (110), and a second telescopic end (181) hinged to the second antenna unit (120). The mounting base (160) is threadedly connected to the lead screw (150). The first telescopic end (171) and the second telescopic end (181) are located on both sides of the mounting base (160) and are respectively disposed opposite to the mounting base (160). The first telescopic end (171) and the second telescopic end (181) are telescopically oriented in the direction of approaching or moving away from the mounting base (160).

5. The satellite signal receiving device according to claim 4, characterized in that, The bidirectional sliding member structure includes a first sliding member (170) and a second sliding member (180). The mounting base (160) forms a first sliding cavity and a second sliding cavity. The first sliding member (170) includes two ends arranged opposite to each other along its length direction, one end of which is slidably sleeved in the first sliding cavity, and the other end of which defines a first telescopic end (171) of the bidirectional sliding member structure. The second sliding member (180) includes two ends arranged opposite to each other along its length direction, one end of which is slidably sleeved in the second sliding cavity, and the other end of which defines a second telescopic end (181) of the bidirectional sliding member structure.

6. The satellite signal receiving device according to claim 5, characterized in that, The bidirectional sliding member structure includes a first elastic element and a second elastic element. The first elastic element connects the first sliding member (170) and the mounting base (160) and is used to apply an elastic force to the first sliding member (170) pointing towards the lead screw (150). The second elastic element connects the second sliding member (180) and the mounting base (160) and is used to apply an elastic force to the second sliding member (180) pointing towards the lead screw (150).

7. The satellite signal receiving device according to claim 4, characterized in that, The lead screw (150) is threadedly connected to a nut (190), and the mounting base (160) is threadedly connected to the lead screw (150) by connecting the nut (190).

8. The satellite signal receiving device according to claim 4, characterized in that, The hinge shaft (130) is arranged perpendicularly to the lead screw (150); it includes a motor for driving the lead screw (150).

9. The satellite signal receiving device according to claim 1, characterized in that, The antenna device (100) is an external antenna device; the external antenna device is connected to the satellite positioning module (300) via an antenna feed line (200).

10. A satellite positioning vehicle-mounted terminal, characterized in that, It includes an in-vehicle recording device (400) and a satellite signal receiving device as described in any one of claims 1 to 9; the satellite positioning module (300) of the satellite signal receiving device is electrically connected to the in-vehicle recording device (400).

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