Double-antenna double-diversity Beidou positioning terminal

Abstract

The utility model provides a double-antenna double-diversity Beidou positioning terminal. The double-antenna double-diversity Beidou positioning terminal comprises a module box, a partition plate, a PCB, a first antenna, a second antenna and a cable, the partition plate is arranged in the module box, the partition plate is of a hollow annular structure, the first antenna and the second antenna are arranged on the two sides of the partition plate respectively, the PCB is fixed to the side, close to the second antenna, of the partition plate, and the cable penetrates through an arm of the module box to be connected with the PCB; the PCB is provided with a double-antenna double-diversity Beidou positioning module circuit, and the double-antenna double-diversity Beidou positioning module circuit is used for selecting the first antenna or the second antenna with strong signals to receive B3, B2b and S frequency band satellite navigation signals and transmitting L frequency band satellite navigation signals. The device has the advantages of high sensitivity, high precision and high dynamic performance, can display excellent narrowband interference resistance in a complex environment, meets the application requirements of industry users on high-precision positioning and speed measurement and short message requirements, can be widely applied to multiple fields, and is low in cost and small in size.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of satellite positioning technology, and particularly relates to a dual-antenna dual-diversity Beidou positioning terminal. BACKGROUND

[0002] With the continuous improvement of the Beidou global satellite positioning system, its application in the military and civilian fields is increasingly widespread. The global application scenarios of the Beidou system are continuously expanding, and the technical index requirements are also rising.

[0003] The promotion of the third-generation Beidou navigation system has enabled satellite navigation technology to steadily grow in the maritime, agricultural, surveying and mapping industries, and has achieved a leap in special application scenarios such as dual-antenna dual-diversity processing. Navigation technology has penetrated into daily life. Especially in the equipment field, the demand for lightweight dual-diversity positioning terminals is increasingly urgent, which requires navigation receivers to have small size, low power consumption, dual-diversity and other characteristics. However, most existing navigation receivers are based on single-antenna designs outside the board, and in some equipment scenarios that require dual-diversity applications, single-antenna designs cannot meet the complex application requirements. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the embodiment of the utility model is to provide a dual-antenna dual-diversity Beidou positioning terminal with high sensitivity, high precision and high dynamic performance, which can display excellent narrow-band interference resistance in complex environments, meet the application requirements of industry users for high-precision positioning and speed measurement, and short message requirements, and can be widely applied in multiple fields with low cost and small size.

[0005] In a first aspect, a dual-antenna dual-diversity Beidou positioning terminal is provided, comprising a module box, a partition, a PCB, a first antenna, a second antenna, and a cable. The partition is arranged in the module box and has a hollow ring structure. The first antenna and the second antenna are arranged on opposite sides of the partition. The PCB is fixed to a side of the partition close to the second antenna. The cable passes through the module box arm and is connected to the PCB. The PCB is provided with a dual-antenna dual-diversity Beidou positioning module circuit. The dual-antenna dual-diversity Beidou positioning module circuit is used to select the first antenna or the second antenna with strong signal to receive B3 frequency band satellite navigation signals, B2b frequency band satellite navigation signals, S frequency band satellite navigation signals, and transmit L frequency band satellite navigation signals.

[0006] In another possible implementation manner, the dual-antenna dual-diversity Beidou positioning module circuit comprises: a radio frequency front-end circuit, a radio frequency circuit and a baseband chip connected in sequence; the radio frequency front-end circuit comprises a first radio frequency switch and a second radio frequency switch; the baseband chip comprises a baseband signal processing unit connected with the radio frequency circuit and a signal processing unit connected with the baseband signal processing unit, and the first radio frequency switch and the second radio frequency switch are connected with the signal processing unit and used for selecting the first antenna or the second antenna with strong signal.

[0007] In a possible implementation manner, the radio frequency circuit comprises: a first radio frequency chip and a second radio frequency chip connected with the baseband chip; the first radio frequency chip is connected with the first antenna or the second antenna through the radio frequency front-end circuit; and the second radio frequency chip is connected with the first antenna or the second antenna through the radio frequency front-end circuit.

[0008] In another possible implementation manner, the dual-antenna dual-diversity Beidou positioning module circuit further comprises: a plurality of filters and a low noise amplifier; the first radio frequency chip is connected with the first radio frequency switch through a filter and used for receiving an S-band satellite navigation signal through the first antenna or the second antenna; the first radio frequency chip is connected with the second radio frequency switch through a filter and the low noise amplifier and used for transmitting an L-band satellite navigation signal through the first antenna or the second antenna; the first radio frequency chip is further connected with the first antenna through different filters and used for receiving a B3-band satellite navigation signal and a B2b-band satellite navigation signal respectively; and the second radio frequency chip is further connected with the second antenna through different filters and used for receiving a B3-band satellite navigation signal and a B2b-band satellite navigation signal respectively.

[0009] In another possible implementation manner, the first antenna and the second antenna are active antennas, comprising: a B2b-frequency point receiving array element, a B3-frequency point receiving array element, an S-frequency point receiving array element and an L-frequency point transmitting array element.

[0010] In another possible implementation manner, the Beidou positioning terminal further comprises a user interface connected with the signal processing unit and used for completing power supply and data communication between the satellite receiver and an external user.

[0011] In another possible implementation manner, the user interface comprises: an IO1 interface, an IO2 interface, an IO3 interface and an RS422 interface.

[0012] In another possible implementation manner, the size of the Beidou positioning terminal is not greater than 80mm in length, 60mm in width and 60mm in height. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced.

[0014] Figure 1The structure schematic diagram of the dual-antenna dual-diversity Beidou positioning terminal is provided for an embodiment of the utility model.

[0015] Figure 2 The structure exploded view of the dual-antenna dual-diversity Beidou positioning terminal is provided for an embodiment of the utility model.

[0016] Figure 3 The structure schematic diagram of the dual-antenna dual-diversity Beidou positioning module circuit is provided for an embodiment of the utility model.

[0017] Figure 4 The specific circuit schematic diagram of the dual-antenna dual-diversity Beidou positioning module circuit is provided for an embodiment of the utility model. DETAILED DESCRIPTION

[0018] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar modules or modules with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, but cannot be interpreted as a limitation on the utility model.

[0019] Those skilled in the art can understand that, unless specifically stated, the singular forms "a", "an" and "the" used herein also include the plural forms. It should be further understood that the phrase "comprising" used in the specification of the present application means that the features, integers, steps, operations, modules and / or components exist, but does not exclude the presence or addition of one or more other features, integers, steps, operations, modules, components and / or their groups. It should be understood that when we say that a module is "connected" or "coupled" to another module, it can be directly connected or coupled to other modules, or there can be intermediate modules. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any module and all combinations of the associated listed items.

[0020] In order to make the purpose, technical scheme and advantages of the present application clearer, the implementation mode of the present application will be described in further detail below.

[0021] The technical scheme of the present application and the technical scheme of the present application and the solution to the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0022] Figure 1 The structure diagram of the dual-antenna dual-diversity Beidou positioning terminal provided by an embodiment of the utility model is shown.Figure 1 As shown in the structural exploded view of the dual-antenna dual-diversity Beidou positioning terminal provided by the embodiment of the utility model. Figure 1 And Figure 2 As shown, the dual-antenna dual-diversity Beidou positioning terminal comprises a module box, a partition, a PCB board, a first antenna, a second antenna and a cable; the partition is arranged in the module box, the partition is of a hollow ring structure, the first antenna and the second antenna are arranged on the two sides of the partition respectively, the PCB board is fixed on the side of the partition close to the second antenna, and the cable is connected with the PCB board through the module box arm; the dual-antenna dual-diversity Beidou positioning module circuit is arranged on the PCB board, and the dual-antenna dual-diversity Beidou positioning module circuit is used for selecting the first antenna or the second antenna with strong signal to receive B3 frequency band satellite navigation signals, B2b frequency band satellite navigation signals and S frequency band satellite navigation signals and transmit L frequency band satellite navigation signals.

[0023] The dual-antenna dual-diversity Beidou positioning terminal of the utility model relies on the Beidou positioning system, is compactly integrated on the Beidou positioning board (i.e. the PCB board) through the linkage of the dual antenna and the coaxial radio frequency cable, can perform signal processing and Beidou positioning on two antennas separately, and has the function of selecting the antenna with strong signal to perform short message communication. The dual-antenna dual-diversity Beidou positioning terminal has the characteristics of small size, low power consumption, simple installation and low cost. Not only does it have the performance comparable to the domestic similar products, but also has the significant advantages of miniaturization and low power consumption, the size is not greater than 80mm in length, 60mm in width and 60mm in height, the power consumption is not more than 2.0W, and the weight is not more than 300g, so it is suitable for being used as a general positioning terminal and is widely deployed in various dual-diversity special equipment.

[0024] The dual-antenna dual-diversity Beidou positioning terminal can receive B3 frequency band satellite navigation signals, B2b frequency band satellite navigation signals, S frequency band satellite navigation signals and transmit L frequency band satellite navigation signals, has high sensitivity, high precision and high dynamic performance, and shows excellent narrow-band interference resistance in complex environments, can fully meet the application requirements of industry users for high-precision positioning and speed measurement, short message requirements, and can be widely applied in many fields, and has the significant advantages of low cost, excellent performance, small size and low power consumption; the dual-antenna dual-diversity Beidou positioning terminal has two antennas, has the function of selecting the antenna with strong signal to perform short message communication, and the two antennas can perform signal processing and positioning calculation separately, so it is fully suitable for various miniaturized, low-power, dual-diversity application requirements in complex environments.

[0025] In the embodiment of the utility model, reference Figure 3 And Figure 4The dual-antenna dual-diversity Beidou positioning module circuit comprises, in sequence, a radio frequency front-end circuit, a radio frequency circuit and a baseband chip. The radio frequency front-end circuit is used for processing satellite navigation signals from two antennas, performing amplification, filtering and the like. The radio frequency circuit is used for performing down-conversion processing on the radio frequency signals and outputting intermediate frequency signals to the baseband chip. The baseband chip is used for completing signal acquisition, tracking, calculation and the like and outputting protocol information such as positioning and speed measurement. The dual-antenna dual-diversity Beidou positioning module circuit further comprises a power supply circuit. The power supply circuit is used for providing power supply for each component. The power supply circuit provides stable power supply for each component circuit on the PCB, selects a power supply chip with high conversion efficiency according to the power supply load, satisfies the size limitation, uses a low-noise LDO power supply for the radio frequency part, and realizes the construction of the whole-board power supply circuit.

[0026] The radio frequency front-end circuit comprises a first radio frequency switch and a second radio frequency switch. The baseband chip comprises a baseband signal processing unit connected with the radio frequency circuit and a signal processing unit connected with the baseband signal processing unit. The first radio frequency switch and the second radio frequency switch are connected with the signal processing unit and are used for selecting the first antenna or the second antenna with strong signals. The first radio frequency switch and the second radio frequency switch realize the radio frequency signal switching function from different antennas and are controlled by the information processing unit. The information processing unit inquires the signal strength of the two antennas at a period of 5 seconds and selects the antenna with strong signals for short message communication. The baseband chip is preferably a baseband chip with a model of BP2020L.

[0027] The first antenna and the second antenna are active antennas and comprise B2b frequency point receiving elements, B3 frequency point receiving elements, S frequency point receiving elements and L frequency point transmitting elements. Thus, the first antenna or the second antenna has the receiving function of RNSS-B3 frequency points, RSSS-S frequency points and B2b frequency points and the transmitting function of RDSS-L frequency points. The receiving channels of the S frequency points and the B2b frequency points of the first antenna and the second antenna are provided with 3.6V power supply by the power supply circuit.

[0028] The satellite navigation signals are linked into the Beidou positioning board (i.e. the PCB) through coaxial radio frequency cables of two antennas, are amplified by an amplification circuit, are processed by a filtering circuit, and are sent into the radio frequency circuit. The radio frequency circuit mainly comprises a professional radio frequency chip, a matching circuit and a voltage-controlled-temperature-compensated crystal oscillator, completes the processing of the radio frequency signals, and outputs intermediate frequency signals to the baseband signal processing unit. The baseband signal processing unit is composed of a baseband core circuit, a reset circuit and a FLASH circuit. The baseband core circuit is responsible for acquiring, tracking, demodulating and decoding the navigation text, extracting the original observation quantity and PVT calculation of the received frequency point signals, and outputting positioning, speed measurement and the like data; the reset circuit can provide a stable reset signal when the Beidou positioning board is powered on, so as to ensure the normal work of the baseband terminal; and the internally integrated FLASH circuit is used for storing the program and part of the data of the baseband chip.

[0029] The radio frequency circuit comprises a first radio frequency chip and a second radio frequency chip connected with the baseband chip. The first radio frequency chip is connected with the first antenna or the second antenna through the radio frequency front-end circuit. The second radio frequency chip is connected with the first antenna or the second antenna through the radio frequency front-end circuit. The first radio frequency chip is preferably a radio frequency chip of model RX3701, and the second radio frequency chip is preferably a radio frequency chip of model RX3706.

[0030] The dual-antenna dual-diversity Beidou positioning module circuit further comprises a plurality of filters and a low-noise amplifier. The first radio frequency chip is connected with the first radio frequency switch through a filter for receiving S-band satellite navigation signals through the first antenna or the second antenna. The first radio frequency chip is connected with the second radio frequency switch through a filter and a low-noise amplifier for transmitting L-band satellite navigation signals through the first antenna or the second antenna. The first radio frequency chip is further connected with the first antenna through different filters for receiving B3-band satellite navigation signals and B2b-band satellite navigation signals, respectively. The second radio frequency chip is further connected with the second antenna through different filters for receiving B3-band satellite navigation signals and B2b-band satellite navigation signals, respectively. The first radio frequency chip and the second radio frequency chip send the received satellite navigation signals to the mixer after low-noise amplification and band-pass filtering to be down-converted into analog intermediate frequency signals, which are converted into digital intermediate frequency signals after AD sampling and transmitted to the baseband signal processing unit. The baseband signal processing unit completes the demodulation and capture, tracking processing and extraction of the original observation quantity of the downlink satellite signal; and is responsible for the data generation, pseudo-code spreading, carrier modulation, power amplification, filtering and the like of the uplink satellite signal, which is radiated to space by the L-frequency antenna. The information processing unit performs PVT calculation and outputs position, velocity and time information.

[0031] The Beidou positioning terminal further comprises a user interface connected with the signal processing unit for completing power supply and data communication between the satellite receiver and the external user. The user interface comprises an IO1 interface, an IO2 interface, an IO3 interface and an RS422 interface; the RS422 interface is used for receiving protocol data, the IO1 interface and the IO2 interface are used for receiving data or signals, and the IO3 interface is used for transmitting data or signals. The information processing unit further receives the IO3 interface signal of the user interface and the protocol data of the RS422 interface, and switches the working module.

[0032] The double-antenna double-diversity Beidou positioning terminal of the embodiment of the utility model adopts double-antenna design for installation, and realizes interconnection and intercommunication of power supply and data through interfaces and corresponding equipment of customers; not only has high sensitivity, high precision and high dynamic performance, but also shows excellent narrow-band interference resistance in complex environments, can fully meet the application requirements of industry users for high-precision positioning and speed measurement, and short message requirements, and can be widely applied in multiple fields. The baseband chip technology is mature, stable in performance, and highly controllable in code, can stably track satellite signals of B3, B2 and S frequency points, realize precise positioning and speed measurement, and short message communication function. The radio frequency switch realizes radio frequency signal switching function from different antennas, is controlled by the information processing unit, the information processing unit inquires signal strength of two antennas with 5 seconds as a period, selects the antenna with strong signal for short message communication. In addition, the miniaturized design and low power consumption characteristics of the baseband chip, combined with the linkage of the two coaxial radio frequency cables of the Beidou positioning board, enable the Beidou positioning terminal to meet the requirements of miniaturization, low power consumption and complex environment double-diversity.

[0033] In summary, the double-antenna double-diversity Beidou positioning terminal of the embodiment of the utility model comprises: a module box, a partition, a PCB, a first antenna, a second antenna and a cable; the partition is arranged in the module box, the partition is a hollow ring structure, the first antenna and the second antenna are arranged on the two sides of the partition respectively, the PCB is fixed on the side of the partition close to the second antenna, and the cable is connected with the PCB through the arm of the module box; the PCB is provided with a double-antenna double-diversity Beidou positioning module circuit, the double-antenna double-diversity Beidou positioning module circuit is used for selecting the first antenna or the second antenna with strong signal to receive B3, B2b and S frequency band satellite navigation signals and transmit L frequency band satellite navigation signals; has high sensitivity, high precision and high dynamic performance, can show excellent narrow-band interference resistance in complex environments, meets the application requirements of industry users for high-precision positioning and speed measurement and short message requirements, can be widely applied in multiple fields, and is low in cost and small in size.

[0034] The above is only part of the implementation mode of the utility model, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principle of the utility model, and these improvements and refinements should also be regarded as the protection scope of the utility model.

Claims

1. A dual-antenna dual-diversity Beidou positioning terminal, characterized in that, The Beidou positioning terminal comprises a module box, a partition plate, a PCB board, a first antenna, a second antenna and a cable; the partition plate is arranged in the module box, the partition plate is a hollow ring structure, the first antenna and the second antenna are arranged on two sides of the partition plate respectively, the PCB board is fixed on a side of the partition plate close to the second antenna, and the cable is connected with the PCB board through the module box arm; a double-antenna double-diversity Beidou positioning module circuit is arranged on the PCB board, and the double-antenna double-diversity Beidou positioning module circuit is used for selecting the first antenna or the second antenna with strong signal to receive B3 frequency band satellite navigation signals, B2b frequency band satellite navigation signals and S frequency band satellite navigation signals and emit L frequency band satellite navigation signals.

2. The Beidou positioning terminal according to claim 1, wherein, The double-antenna double-diversity Beidou positioning module circuit comprises a radio frequency front-end circuit, a radio frequency circuit and a baseband chip connected in sequence; the radio frequency front-end circuit comprises a first radio frequency switch and a second radio frequency switch; the baseband chip comprises a baseband signal processing unit connected with the radio frequency circuit and a signal processing unit connected with the baseband signal processing unit, and the first radio frequency switch and the second radio frequency switch are connected with the signal processing unit and used for selecting the first antenna or the second antenna with strong signal.

3. The Beidou positioning terminal according to claim 2, wherein the Beidou positioning terminal is configured to: The radio frequency circuit comprises a first radio frequency chip and a second radio frequency chip connected with the baseband chip; the first radio frequency chip is connected with the first antenna or the second antenna through the radio frequency front-end circuit; and the second radio frequency chip is connected with the first antenna or the second antenna through the radio frequency front-end circuit.

4. The Beidou positioning terminal according to claim 3, wherein the Beidou positioning terminal is configured to: The double-antenna double-diversity Beidou positioning module circuit further comprises a plurality of filters and a low noise amplifier; the first radio frequency chip is connected with the first radio frequency switch through one of the filters and used for receiving S frequency band satellite navigation signals through the first antenna or the second antenna; the first radio frequency chip is connected with the second radio frequency switch through one of the filters and the low noise amplifier and used for emitting L frequency band satellite navigation signals through the first antenna or the second antenna; the first radio frequency chip is further connected with the first antenna through different filters and used for receiving B3 frequency band satellite navigation signals and B2b frequency band satellite navigation signals respectively; and the second radio frequency chip is further connected with the second antenna through different filters and used for receiving B3 frequency band satellite navigation signals and B2b frequency band satellite navigation signals respectively.

5. The Beidou positioning terminal according to claim 4, wherein the Beidou positioning terminal is configured to: The first antenna and the second antenna are active antennas and comprise a B2b frequency point receiving array element, a B3 frequency point receiving array element, an S frequency point receiving array element and an L frequency point emitting array element.

6. The Beidou positioning terminal according to claim 2, wherein the Beidou positioning terminal is a Beidou handheld terminal. The Beidou positioning terminal further comprises a user interface connected with the signal processing unit and used for completing power supply and data communication between a satellite receiver and an external user.

7. The BeiDou positioning terminal as described in claim 6, characterized in that, The user interface comprises an IO1 interface, an IO2 interface, an IO3 interface and an RS422 interface.

8. The Beidou positioning terminal according to claim 1, wherein, The size of the Beidou positioning terminal is not greater than 80mm in length, 60mm in width and 60mm in height.

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