CN213149998U

CN213149998U - GNSS remote positioning data acquisition and transmission device

Info

Publication number: CN213149998U
Application number: CN202022546076.8U
Authority: CN
Inventors: 王云莎
Original assignee: Liangshan Beidou Technology Co ltd
Current assignee: Liangshan Beidou Technology Co ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-05-07
Anticipated expiration: 2030-11-06

Abstract

The utility model discloses a GNSS remote positioning data acquisition and transmission device, which comprises a data processing unit, wherein the data processing unit comprises a preceding stage amplification module, a frequency mixing module and a rear stage amplification module which are connected in sequence, and the preceding stage amplification module comprises a filtering amplification circuit, an isolation bias circuit and a matching circuit; the input end of the filter amplifying circuit is connected with the output end of the antenna receiving unit, the output end of the filter amplifying circuit is connected with the input end of the matching circuit, the output end of the matching circuit is connected with the input end of the mixing module, the input end of the isolation bias circuit is connected with the output end of the power supply unit, and the output end of the isolation bias circuit is connected with the filter amplifying circuit; the antenna receiving unit receives a remote radio frequency signal and then sends the remote radio frequency signal to the filtering amplifying circuit, the filtering amplifying circuit carries out two-stage filtering amplification on the remote radio frequency signal, the isolation biasing circuit provides a direct current biasing signal with high isolation for the filtering amplifying circuit, and the matching circuit provides impedance matching between the radio frequency signal and the frequency mixing module.

Description

GNSS remote positioning data acquisition and transmission device

Technical Field

The utility model relates to a GNSS receiver field specifically is a GNSS remote positioning data gathers transmission device.

Background

The high-precision GNSS receiver is used as the most mainstream satellite navigation technology measurement application product at present, and is increasingly widely applied in the fields of modern surveying and mapping, transportation, public safety, rescue, modern agriculture and the like. In the operation mode, the GNSS receiver respectively collects data by taking one receiver as a reference station and taking the other receiver as a mobile station, and the reference station transmits observed values and coordinate information of the survey station to the mobile station through a data chain. The mobile station not only receives data from the reference station through a data chain, but also acquires GNSS observation data, forms a differential observation value in the system for real-time processing, and simultaneously provides millimeter-scale positioning information.

The high-precision GNSS receiver comprises a GNSS antenna device, a data processing unit, a mainboard unit, a data communication unit, a battery unit and the like, wherein the data processing unit comprises a pre-stage amplification module, a frequency mixing module and a post-stage amplification module. When the satellite radio-frequency signal reaches the GNSS antenna device, the satellite radio-frequency signal is very weak, and the data processing unit is used for carrying out amplification, filtering, mixing and other processing on the satellite radio-frequency signal so as to facilitate the subsequent processing of the mainboard unit. The problems of large noise, poor isolation and the like still exist in the processing of satellite radio frequency signals by a data processing unit in the conventional GNSS receiver.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve prior art's above-mentioned problem, provide a GNSS long-range locating data acquisition and transmission device, can carry out the low noise filtering to the radio frequency signal who receives when it is used and enlarge, and have high isolation and high impedance matching degree.

The purpose of the utility model is mainly realized through the following technical scheme: a GNSS remote positioning data acquisition and transmission device comprises a power supply unit, an antenna receiving unit, a data processing unit, a mainboard unit and a data communication unit which are sequentially connected, wherein the data processing unit comprises a preceding-stage amplification module, a frequency mixing module and a subsequent-stage amplification module which are sequentially connected, and the preceding-stage amplification module comprises a filtering amplification circuit, an isolation bias circuit and a matching circuit; the input end of the filter amplifying circuit is connected with the output end of the antenna receiving unit, the output end of the filter amplifying circuit is connected with the input end of the matching circuit, the output end of the matching circuit is connected with the input end of the mixing module, the input end of the isolation bias circuit is connected with the output end of the power supply unit, and the output end of the isolation bias circuit is connected with the filter amplifying circuit; the antenna receiving unit receives a remote radio frequency signal and then sends the remote radio frequency signal to the filtering amplification circuit, the filtering amplification circuit carries out two-stage filtering amplification on the remote radio frequency signal, the isolation bias circuit provides a direct current bias signal with high isolation for the filtering amplification circuit, and the matching circuit provides impedance matching between a radio frequency signal at the input end of the preceding stage amplification module and the load frequency mixing module at the output end.

Preferably, the filtering and amplifying circuit comprises amplifiers U1 and U3, filters U2 and U4, an inductor L4, capacitors C4 to C4, a pin 3 of the amplifier U4 is connected with the capacitor C4 and then connected with an output end of the antenna receiving unit and one end of the inductor L4, the other end of the inductor L4 is connected with one end of the capacitor C4, one end of the capacitor C4 and one end of the capacitor C4, the other ends of the capacitors C4, C4 and C4 are all grounded, a pin 6 of the amplifier U4 is connected with the capacitor C4 and then connected with a pin 2 of the filter U4, a pin 5 of the filter U4 is connected with the capacitor C4 and then connected with a pin 2 of the amplifier U4, a pin 1, a pin 2, a pin 4 and a pin 5 of the amplifiers U4 and U4 are all grounded, and

pins

1, 3 and 6 of the filters U4 and U4 are all grounded.

Preferably, the isolation bias circuit comprises resistors R1 and R2, inductors L2 and L3, capacitors C1 to C4, one end of the inductor L2 is connected to the pin 6 of the amplifier U1, the other end of the inductor L2 is connected to one end of a capacitor C1 and one end of a capacitor C2 and then connected to one end of a resistor R1, the other end of the resistor R1 is connected to the output end of the power supply unit, and the other ends of the capacitors C1 and C2 are both grounded; one end of an inductor L3 is connected with a pin 6 of an amplifier U3, the other end of the inductor L3 is connected with one end of a capacitor C3 and one end of a capacitor C4 and then connected with one end of a resistor R2, the other end of a resistor R2 is connected with the output end of the power supply unit, and the other ends of the capacitors C3 and C4 are both grounded.

To sum up, the utility model discloses following beneficial effect has: the pre-stage amplifying circuit of the data processing unit can perform low-noise amplification twice and filtering three times on radio-frequency signals received by the antenna, reduces signal noise, provides a direct-current bias signal to enable the amplifier to work stably, has high isolation between the radio-frequency signals and the direct-current bias signal, and provides good impedance matching between the radio-frequency signals and the frequency mixing module through the matching circuit.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a diagram of a preceding stage amplifying circuit according to an embodiment of the present invention.

Detailed Description

In the following description, numerous implementation details are set forth in order to provide a more thorough understanding of the present invention. It should be understood, however, that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, details of these implementations are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.

It should be noted that unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b): the utility model provides a GNSS long-range positioning data gathers transmission device, its structure is the same with current GNSS receiver structure, includes power supply unit and the antenna receiving element, data processing unit, mainboard unit, the data communication unit that connect gradually, and the power supply unit output is connected with other units respectively, provides power supply signal for it. The data processing unit comprises a pre-stage amplification module, a frequency mixing module and a post-stage amplification module which are connected in sequence, and the data processing unit is used for carrying out operations such as amplification, filtering, frequency mixing, re-filtering and amplification on satellite radio-frequency signals received by the antenna receiving unit so as to facilitate subsequent processing of the main board unit.

In order to reduce the noise of the data processing unit and improve the isolation of radio frequency signals, the utility model discloses the preceding stage amplifier module in includes filtering amplifier circuit, isolation bias circuit and matching circuit; the input end of the filter amplifying circuit is connected with the output end of the antenna receiving module, the output end of the filter amplifying circuit is connected with the input end of the matching circuit, the output end of the matching circuit is connected with the input end of the frequency mixing module, the input end of the isolation bias circuit is connected with the output end of the power supply module, and the output end of the isolation bias circuit is connected with the filter amplifying circuit; the antenna receiving module receives a remote radio frequency signal and then sends the remote radio frequency signal to the filtering amplification circuit, the filtering amplification circuit carries out two-stage low-noise filtering amplification on the remote radio frequency signal, the isolation bias circuit provides a high-isolation direct current bias signal for the filtering amplification circuit, and the matching circuit provides impedance matching between a radio frequency signal at the input end of the preceding stage amplification module and the load frequency mixing module at the output end.

Specifically, as shown in fig. 1, the filter amplifying circuit includes amplifiers U1 and U3, U1 and U3 with model number HMC476SC70, filters U2 and U4, and U2 and U4 with model number TA1584A, an inductor L1, capacitors C5 to C12, and the matching circuit includes resistors R3 to R5 and a capacitor C13. Pin 3 of amplifier U1 is connected to capacitor C8 and then connected to the output terminal of the antenna receiving unit and one end of inductor L1, the other end of inductor L1 is connected to one end of capacitor C1, one end of C1 and one end of C1, the other ends of capacitors C1, C1 and C1 are all grounded, pin 6 of amplifier U1 is connected to capacitor C1 and then connected to pin 2 of filter U1, pin 5 of filter U1 is connected to capacitor C1 and then connected to pin 3 of amplifier U1, pin 6 of amplifier U1 is connected to capacitor C1 and then connected to pin 2 of filter U1, pin 5 of filter U1 is connected to the input terminal of matching circuit after connected to capacitor C1, that is one end of resistor R1 and one end of R1, the other end of R1 is connected to capacitor C1 and then connected to the input terminal of mixing module, the other ends of resistors R1 and R1 are all grounded, pin 1, pin 2, pin 4 and pin 5 of amplifiers U1 and U1 are all grounded.

The isolation bias circuit comprises resistors R1 and R2, inductors L2 and L3, capacitors C1 to C4, one end of the inductor L2 is connected with a pin 6 of an amplifier U1, the other end of the inductor L2 is connected with one end of a capacitor C1 and one end of a capacitor C2 and then connected with one end of a resistor R1, the other end of the resistor R1 is connected with the output end of the power unit, and the other ends of the capacitors C1 and C2 are grounded; one end of an inductor L3 is connected with a pin 6 of an amplifier U3, the other end of the inductor L3 is connected with one end of a capacitor C3 and one end of a capacitor C4 and then connected with one end of a resistor R2, the other end of a resistor R2 is connected with the output end of the power supply unit, and the other ends of the capacitors C3 and C4 are both grounded.

The rf signal is sent from the antenna receiving unit, first filtered by the inductor L1 and the capacitors C5 to C7, and then sent to the amplifier U1 for the first low noise amplification. One path of direct current bias signals provided by the power supply unit is filtered by the resistor R1, the capacitors C1 and C2 and then is sent to the pin 6 of the amplifier U1 through the inductor L2, so that the stable operation of the amplifier U1 is ensured. The inductor L2 isolates the dc bias signal from the rf signal to avoid rf signal coupling distortion. Since noise may be introduced into the amplifier U1, the resistor R1, the capacitors C1 and C2, and the inductor L2, the low-noise amplified rf signal is output from the U1 and then sent to the filter U2 for secondary filtering. And after the subsequent amplifier U3 and the filter U4 respectively carry out secondary low-noise amplification and tertiary filtering, the radio-frequency signal is sent to the input end of the frequency mixing module through the matching circuit. The other path of the dc bias signal provided by the power supply unit is filtered by the resistor R2, the capacitors C3 and C4, and then sent to the pin 6 of the amplifier U3 through the isolation inductor L3.

The utility model discloses well data processing unit's preceding stage amplifier circuit can carry out twice low noise amplification and cubic filtering to the radio frequency signal that the antenna was received, has reduced signal noise, provides direct current bias signal in addition and makes amplifier steady operation, and the isolation between radio frequency signal and the direct current bias signal is high, still provides good impedance matching through matching circuit for between radio frequency signal and the mixing module.

Parts not described in the above modes can be realized by adopting or referring to the prior art.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments thereof. To the utility model belongs to the technical field of the ordinary skilled person say, do not deviate from the utility model discloses a other embodiments that reach under the technical scheme all should be contained the utility model discloses a within the scope of protection.

Claims

1. The utility model provides a GNSS remote positioning data gathers transmission device, includes power supply unit and the antenna receiving element, data processing unit, mainboard unit, the data communication unit that connect gradually, and the data processing unit is including preceding stage amplification module, mixing module and the latter stage amplification module that connect gradually, its characterized in that: the pre-stage amplification module comprises a filtering amplification circuit, an isolation bias circuit and a matching circuit; the input end of the filter amplifying circuit is connected with the output end of the antenna receiving unit, the output end of the filter amplifying circuit is connected with the input end of the matching circuit, the output end of the matching circuit is connected with the input end of the mixing module, the input end of the isolation bias circuit is connected with the output end of the power supply unit, and the output end of the isolation bias circuit is connected with the filter amplifying circuit; the antenna receiving unit receives a remote radio frequency signal and then sends the remote radio frequency signal to the filtering amplification circuit, the filtering amplification circuit carries out two-stage filtering amplification on the remote radio frequency signal, the isolation bias circuit provides a direct current bias signal with high isolation for the filtering amplification circuit, and the matching circuit provides impedance matching between a radio frequency signal at the input end of the preceding stage amplification module and the load frequency mixing module at the output end.

2. The GNSS remote positioning data collecting and transmitting device of claim 1, wherein: the filtering amplification circuit comprises amplifiers U1 and U3, filters U2 and U4, an inductor L4, capacitors C4 to C4, a pin 3 of the amplifier U4 is connected with the capacitor C4 and then connected with an output end of an antenna receiving unit and one end of the inductor L4, the other end of the inductor L4 is connected with one end of the capacitor C4, one end of the C4 and one end of the C4, the other ends of the capacitors C4, C4 and C4 are all grounded, a pin 6 of the amplifier U4 is connected with the capacitor C4 and then connected with a pin 2 of the filter U4, a pin 5 of the filter U4 is connected with the capacitor C4 and then connected with a pin 3 of the amplifier U4, a pin 1, a pin 2, a pin 4 and a pin 5 of the amplifiers U4 are all grounded, and pins 1, 3, 6 and 6 of the filters U4 are all grounded.

3. The GNSS remote positioning data collecting and transmitting device of claim 1, wherein: the isolation bias circuit comprises resistors R1 and R2, inductors L2 and L3, capacitors C1 to C4, one end of the inductor L2 is connected with a pin 6 of an amplifier U1, the other end of the inductor L2 is connected with one end of a capacitor C1 and one end of a capacitor C2 and then connected with one end of a resistor R1, the other end of the resistor R1 is connected with the output end of a power unit, and the other ends of the capacitors C1 and C2 are grounded; one end of an inductor L3 is connected with a pin 6 of an amplifier U3, the other end of the inductor L3 is connected with one end of a capacitor C3 and one end of a capacitor C4 and then connected with one end of a resistor R2, the other end of a resistor R2 is connected with the output end of the power supply unit, and the other ends of the capacitors C3 and C4 are both grounded.