A circuit structure for converting single-board dual-antenna satellite signals into baseband signals

Abstract

The present invention designs a circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal. This structure can be applied to single-board dual-antenna dual-system positioning and orientation, or even three-system positioning and orientation, and can also be applied to the test requirements of measuring two points on one board. Implementation steps: There are two antenna interfaces A and B, two amplification units and two primary power division units on the circuit. After the primary power division, the signal forms three-way signals, one of which forms two frequency points after mixing and secondary power division, and the other two forms two frequency points respectively. In this way, the two antennas A and B each form four frequency points, that is, two first frequency points and two second frequency points, such as GPSL1, GPSL2, BDB1, and BDB3. The two frequency points of the two antennas share a local oscillator unit, and then the radio frequency signals of the dual antennas are filtered; the filtered 8 radio frequency signals are down-converted and demodulated, and then output to the baseband part for baseband signal processing, thereby realizing the single-board dual-antenna multi-system satellite application.

Description

Technical Field

[0001] The invention relates to the application field of GPS, Beidou and GLONASS satellite signals, and its main feature is to design a circuit structure with a suitable single-board dual antenna supporting multiple systems. Background Art

[0002] The global satellite navigation and positioning system has been widely used. Different geographical locations and application domains have different requirements for the system and frequency. For example, in the field of orientation, many scholars are studying and seeking answers to how to achieve low-cost, low-power and required circuit structures on a limited board area. At present, in the field of satellite applications, single antennas are the main ones, and satellite applications that support single-board dual-antenna dual-system or multi-system are relatively rare, especially for Beidou dual-antenna positioning and orientation used in the domestic market. Foreign boards basically do not have this function because they do not have Beidou B3 signals. Summary of the invention

[0003] Based on the technical defects in the existing technology, it is necessary to minimize power consumption and circuit area in the dual-antenna dual-system orientation and circuit structure. For this purpose, the design method in this article came into being.

[0004] The present invention provides a circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal.

[0005] Two antennas are placed on the single board, and there are two independent RF signal processing units;

[0006] Each antenna supports two first-frequency points and two second-frequency points;

[0007] Any RF signal processing unit includes an amplifier circuit and a primary power division circuit. The signal of each antenna is amplified by the amplifier circuit and divided by the primary power division circuit to form three signal channels, of which two signal channels are separated into one frequency point of two systems, and the signal of another channel is formed into two two frequency points through an up-conversion processing circuit and a secondary power division circuit.

[0008] Two frequency conversion processing circuits of two antennas share one local oscillator unit;

[0009] The 4-frequency radio frequency signals formed after the mixing process of each single antenna are filtered through the modulation processing circuit;

[0010] The filtered signal enters the demodulation process and is output to the baseband processing circuit for baseband signal processing.

[0011] The circuit structure for converting the single-board dual-antenna satellite signal into a baseband signal is structured in which two signal processing units for two antennas are respectively configured on the single board, and the two signal processing units are independent of each other.

[0012] The above-mentioned single-board dual-antenna satellite signal is converted into a circuit structure of a baseband signal, wherein the signal will undergo two power divisions to form four frequency points, the first-level power division of the first-level power division circuit will form three channels, and the second-level power division of the second-level power division circuit will form four frequency points.

[0013] In the circuit structure for converting the satellite signal of the single-board dual-antenna into a baseband signal, two dual-frequency point signals of each antenna share a frequency conversion processing circuit for up-conversion.

[0014] In the circuit structure for converting the satellite signal of the single-board dual-antenna into a baseband signal, two frequency conversion processing circuits of the two antennas share a local oscillator generating unit.

[0015] The above-mentioned circuit structure for converting the single-board dual-antenna satellite signal into a baseband signal further includes a clock signal generating unit, which is connected to the local oscillator signal generating unit and the baseband signal processing circuit respectively.

[0016] The circuit structure for converting the satellite signal of the single-board dual-antenna into a baseband signal is constructed, wherein each antenna supports two single-frequency point signal resources and two dual-frequency point signal resources respectively.

[0017] Specific implementation steps: There are two antenna interfaces A and B, two amplification units and two primary power division units in the circuit. After the primary power division, the signal forms three signals, one of which forms two frequency points after mixing and secondary power division, and the other two forms two frequency points respectively. In this way, the two antennas A and B each form four frequency points, that is, two single frequency points and two dual frequency points, such as GPSL1, GPSL2, BDB1, and BDB3. The dual frequency points of the two antennas share a local oscillator unit, and then the RF signals of the dual antennas are filtered; the filtered 8 RF signals are down-converted and demodulated and then output to the baseband part for baseband signal processing, thereby realizing a single-board dual-antenna multi-system satellite application. This structure prepares two single frequency points and two dual frequency point resources for each antenna, saving power consumption and reducing hardware area and cost.

[0018] Advantages of the implementation of the present invention: The circuit structure of the present invention for converting a single-board dual-antenna satellite signal into a baseband signal forms a two-way signal processing link by connecting the dual antennas to a single board, and has the advantages of dual antennas. After signal processing, each antenna is stripped into four frequency points, which can be applied to the positioning and orientation of dual systems and even triple systems. Two frequency points share a mixing circuit, which effectively reduces the circuit area and cost while ensuring the signal quality. In addition, an independent local oscillator signal is used to form a differential two-way local oscillator signal for use in the two-way mixing circuit through a buffer amplifier circuit, which also reduces the mutual interference between the two channels and improves the signal-to-noise ratio of the system. The circuit structure is simple and practical, the use process is convenient and fast, the working performance is stable and reliable, the scope of application is relatively wide, and the single board can realize the positioning detection of two positions, which is widely welcomed by users. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention and its features, configurations and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts throughout the drawings. The drawings are not drawn to scale, but rather to illustrate the subject matter of the present invention.

[0020] Figure 1 The present invention is a schematic diagram of the overall structure of a circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal. DETAILED DESCRIPTION

[0021] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0022] In order to fully understand the present invention, detailed steps and detailed structures will be proposed in the following description to illustrate the technical solution of the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0023] The present invention provides a circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal, and the specific structure is as follows:

[0024] Two antennas are placed on the single board, and there are two independent RF signal processing units;

[0025] Each antenna supports two first-frequency points and two second-frequency points;

[0026] Any RF signal processing unit includes an amplifier circuit and a primary power division circuit. The signal of each antenna is amplified by the amplifier circuit and divided by the primary power division circuit to form three signal channels, of which two signal channels are separated into one frequency point of two systems, and the signal of another channel is formed into two two frequency points through an up-conversion processing circuit and a secondary power division circuit.

[0027] Two frequency conversion processing circuits of two antennas share one local oscillator unit;

[0028] The 4-frequency radio frequency signals formed after the mixing process of each single antenna are filtered through the modulation processing circuit;

[0029] The filtered signal enters the demodulation process and is output to the baseband processing circuit for baseband signal processing.

[0030] In an optional embodiment of the present invention, two signal processing units for two antennas are respectively configured on the single board, and the two signal processing units are independent of each other.

[0031] In an optional embodiment of the present invention, the signal will undergo two power divisions to form four frequency points, the first-level power division of the first-level power division circuit will form three channels, and the second-level power division of the second-level power division circuit will form four frequency points.

[0032] In an optional embodiment of the present invention, two dual-frequency signals of each antenna share a frequency conversion processing circuit for up-conversion.

[0033] In an optional embodiment of the present invention, two frequency conversion processing circuits of two antennas share a local oscillator generating unit.

[0034] In an optional embodiment of the present invention, a clock signal generating unit is further included, and the clock signal generating unit is connected to the local oscillator signal generating unit and the baseband signal processing circuit respectively.

[0035] In an optional embodiment of the present invention, each antenna supports two single-frequency signal resources and two dual-frequency signal resources respectively.

[0036] The present invention provides a circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal, wherein the signal comes from two antennas A and B. The signal received by antenna A passes through a low noise amplifier on channel A, enters a primary divider on channel A, and is divided into three channels, wherein two channels are stripped of two single-frequency signals through filters, and the other channel enters a mixer circuit on channel A for up-conversion, and then the secondary power is divided into two channels, which become two two-frequency signals after passing through filters respectively, so that an antenna can support four frequencies of two systems. In the same principle, antenna B passes through a low noise amplifier on channel B and a power divider, and is divided after mixing, generating four frequency signals on channel B. In the mixing part, the mixing of the two antennas shares a local oscillator unit to provide signals, so the local oscillator circuit is connected to the two mixing circuits. Two antennas are placed on a single board, and are respectively connected to the corresponding amplifying circuit units. After the signal passes through the amplifying circuit unit, three channels are formed, wherein two channels directly enter the filtering unit, and the third channel enters the mixing circuit. The signal entering the mixing circuit will be processed and divided twice to form two signals.

[0037] Furthermore, the frequency mixing circuit units of the two antennas share a local oscillator generating unit. The circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal also includes a clock signal generating unit, which is connected to the local oscillator signal generating unit and the baseband signal processing circuit respectively. The circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal, each antenna supports two first-frequency points and two second-frequency points.

[0038] Please refer to the following Figure 1 , shows a circuit structure of converting dual-antenna dual-system satellite signals into baseband signals in a typical embodiment of the present invention, and the circuit structure of converting dual-antenna satellite signals into baseband signals includes a signal amplification unit, a power division unit, a signal mixing processing unit, a local oscillator signal generating unit, an AD conversion unit, a baseband signal processing circuit, and a clock generating unit. The A antenna and the B antenna are respectively connected to two low-noise signal amplification processing units, and the amplified signal enters the power division processing unit, that is, the signal amplification unit is directly connected to the power division unit; the two power division processing units are respectively connected to three channels, two of which are directly connected to the filtering unit, and the third channel is connected to the mixing unit. The mixing unit is directly connected to the secondary power division unit to form two channels, and the two channels are directly connected to the filtering unit to strip out the effective signal. The local oscillator signal generating unit is connected to the local oscillator signal amplification unit, and then two local oscillator signals are formed, which are directly connected to the signal mixing processing unit. The signal is connected to the demodulation processing unit through the filtering unit and enters the baseband. The clock generating unit is simultaneously connected to the local oscillator signal generating unit, the demodulation processing unit, and the baseband signal. The overall circuit structure is simple and practical, the use process is convenient and fast, the working performance is stable and reliable, and the application range is relatively wide.

[0039] Advantages of the implementation of the present invention: The circuit structure of the present invention for converting a single-board dual-antenna satellite signal into a baseband signal forms a two-way signal processing link by connecting the dual antennas to a single board, and has the advantages of dual antennas. After signal processing, each antenna is stripped into four frequency points, which can be applied to the positioning and orientation of dual systems and even triple systems. Two frequency points share a mixing circuit, which effectively reduces the circuit area and cost while ensuring the signal quality. In addition, an independent local oscillator signal is used to form a differential two-way local oscillator signal for use in the two-way mixing circuit through a buffer amplifier circuit, which also reduces the mutual interference between the two channels and improves the signal-to-noise ratio of the system. The circuit structure is simple and practical, the use process is convenient and fast, the working performance is stable and reliable, the scope of application is relatively wide, and the single board can realize the positioning detection of two positions, which is widely welcomed by users.

[0040] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal, characterized in that: Two antennas are placed on the single board, and there are two independent RF signal processing units; Each antenna supports two first-frequency points and two second-frequency points; Any RF signal processing unit includes an amplifier circuit and a primary power division circuit. The signal of each antenna is amplified by the amplifier circuit and divided by the primary power division circuit to form three signal channels, of which two signal channels are separated into one frequency point of two systems, and the signal of another channel is formed into two two frequency points through an up-conversion processing circuit and a secondary power division circuit. Two frequency conversion processing circuits of two antennas share one local oscillator unit; The 4-frequency radio frequency signals formed after the mixing process of each single antenna are filtered through the modulation processing circuit; The filtered signal enters the demodulation process and is output to the baseband signal processing circuit for baseband signal processing; The single board is respectively configured with two antenna signal processing units, and the two signal processing units are independent of each other; The two dual-frequency signals of each antenna share a frequency conversion processing circuit for up-conversion.

2. The circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal according to claim 1, characterized in that: The signal will undergo two power divisions to form four frequency points. The first-level power division of the first-level power division circuit will form three channels, and the second-level power division of the second-level power division circuit will form four frequency points.

3. The circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal according to claim 1, characterized in that: The two frequency conversion processing circuits of the two antennas share one local oscillator generating unit.

4. The circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal according to claim 1, characterized in that: It also includes a clock signal generating unit, which is connected to the local oscillator signal generating unit and the baseband signal processing circuit respectively.

5. The circuit structure for converting a single-board dual-antenna satellite signal into a baseband signal according to claim 1, characterized in that: Each antenna supports two single-frequency signal resources and two dual-frequency signal resources.

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