CN213023578U

CN213023578U - Circuit for reducing GPS signal interference

Info

Publication number: CN213023578U
Application number: CN202021505537.0U
Authority: CN
Inventors: 梁春林
Original assignee: Guangdong Yinuo Communication Co Ltd
Current assignee: Guangdong Yinuo Communication Co Ltd
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2021-04-20
Anticipated expiration: 2030-07-27

Abstract

The utility model provides a pair of reduce GPS signal interference's circuit, a serial communication port, include: the GPS receiver comprises an upper computer, a radio frequency transceiver and a GPS receiver, wherein the upper computer controls signals of the radio frequency transceiver and the GPS receiver, the radio frequency transceiver is sequentially connected with a first amplifier, a duplexer, a first low-pass filter ASM switch and a tuning switch, the tuning switch is connected with a main antenna, the radio frequency transceiver is further connected with a logic circuit, the logic circuit is connected with the tuning switch, the upper computer controls the logic circuit through an interrupt signal, the logic circuit is electrically connected with the GPS receiver, the GPS receiver is further sequentially connected with a second amplifier, an SAW filter and a second low-pass filter, the second low-pass filter is connected with the GPS antenna, and the logic circuit is connected with the second amplifier. And monitoring whether the interference occurs in real time by using a hardware circuit mode, and controlling and eliminating the interference by an upper computer.

Description

Circuit for reducing GPS signal interference

Technical Field

The utility model belongs to the technical field of the cell-phone antenna, especially, relate to a reduce GPS signal interference's circuit.

Background

Currently, AGPS is an assisted global positioning system, which can utilize the information of the mobile phone base station in cooperation with the conventional GPS satellite to make the positioning speed faster. When AGPS works, the main radio frequency of the mobile phone also works, and the main radio frequency signal can generate interference on a GPS signal when being transmitted at high power, so that the AGPS performance is reduced. Especially the second harmonic of Band13/14 falls directly into the GPS reception Band, directly affecting GPS reception. The AGPS coexistence interference problem is a general challenge in current handset design. The existing solutions are to add a filter in the main rf path to reduce the interference of the main rf to the GPS. However, the addition of the filter cannot completely eliminate interference, and different gps receiving platforms have different demodulation capabilities, which increases the requirement on the isolation between the filter and the antenna, so that the design of the mobile phone becomes more difficult.

In summary, there is a need for a method and system that can solve the above-mentioned technical problem, and can utilize the combined action of the GPS receiving circuit control signal and the main rf antenna tunnel control signal, when the main rf and the GPS work together, if there is interference in the actual test, the upper station sends the control signal to the rf transceiver, so as to reduce the main rf interference.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned prior art's weak point, the utility model aims to provide a reduce GPS signal interference's circuit aims at solving prior art and reduces the problem of main radio frequency to GPS's interference.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a circuit for reducing GPS signal interference, comprising: the GPS receiver comprises an upper computer, a radio frequency transceiver and a GPS receiver, wherein the upper computer controls signals of the radio frequency transceiver and the GPS receiver, the radio frequency transceiver is sequentially connected with a first amplifier, a duplexer, a first low-pass filter, an ASM switch and a tuning switch, the tuning switch is connected with a main antenna, the radio frequency transceiver is further connected with a logic circuit, the logic circuit is connected with the tuning switch, the upper computer controls the logic circuit through an interrupt signal, the logic circuit is electrically connected with the GPS receiver, the GPS receiver is further sequentially connected with a second amplifier, an SAW filter and a second low-pass filter, the second low-pass filter is connected with the GPS antenna, and the logic circuit is connected with the second amplifier.

Preferably, the first amplifier is a PA amplifier and the second amplifier is an LNA amplifier.

Preferably, the first low-pass filter and the second low-pass filter are of the type RFLPF1005040YM1T 76.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a pair of reduce GPS signal interference's circuit, utilize GPS receiving circuit control signal and main radio frequency antenna tunner control signal combined action, as the interrupt signal of host computer, handle GPS control signal and antenna tunner control signal through logic circuit, when GPS is receiving, if the main radio frequency of interference launches, then the host computer sends control signal for the radio frequency transceiver, reduce main radio frequency transmitting power, utilize the hardware circuit mode to reduce main radio frequency and disturb GPS.

Drawings

Fig. 1 is a circuit block diagram of the present invention.

Reference numerals:

10. the radio frequency transceiver 20, the first amplifier 30, the duplexer 40, the first low pass filter 50, the ASM switch 60, the tuning switch 70, the logic circuit 80., the GPS receiver 90, the second amplifier 100, the SAW filter 110, the second low pass filter 120, and the host computer.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

As shown in fig. 1, the present invention provides a circuit for reducing GPS signal interference, which includes: the GPS receiver comprises an upper computer 120, a radio frequency transceiver 10 and a GPS receiver 80, wherein the radio frequency transceiver 10 and the GPS receiver 80 are controlled by signals of the upper computer 120, the radio frequency transceiver 10 is sequentially connected with a first amplifier 20, a duplexer 30, a first low-pass filter 40, an ASM switch 50 and a tuning switch 60, the tuning switch 60 is connected with a main antenna, the radio frequency transceiver 10 is further connected with a logic circuit 70, the logic circuit 70 is connected with the tuning switch 60, the upper computer 120 controls the logic circuit 70 through an interrupt signal, the logic circuit 70 is electrically connected with the GPS receiver 80, the GPS receiver 80 is further sequentially connected with a second amplifier 90, a SAW filter 100 and a second low-pass filter 110, the second low-pass filter 110 is connected with a GPS antenna, and the logic circuit 70 is connected with the second amplifier 90.

It should be noted that, according to the theory of GPS reception, when the GPS signal is not interfered, the main RF needs to satisfy P ≦ -174dbm/hz in the GPS band. And P ═ PAout-DPXatt-LPFatt + ASM-ANTiso. Where PAout is the output signal power, DPXiso represents the duplexer 30 rejection, LPFatt represents the filter rejection, ASM represents the switching gain, and anti represents the antenna isolation. PAout, DPXatt, LPFatt and ASM are all common devices in the industry, and after the typical value is substituted, P is-84-45-32 +5-ANTiso is less than or equal to-174. Therefore, the isolation between the antennas needs to be more than 15, and the antenna isolation in the current mobile phone design is difficult to guarantee.

Specifically, the GPS receiving circuit needs to add the external second amplifier 90, and when the GPS operates, the second amplifier 90 needs to operate under the control of the EN enable signal of the GPS second amplifier 90, so that when the signal is enabled, the GPS operates. The antenna tuner and the tuning switch 60 are arranged at the main radio frequency antenna port on the circuit design of the mobile phone, and the antenna gain is changed in a tuning mode. And the tunnel also needs to be controlled by an enabling signal, namely the enabling signal represents that the main radio frequency works. According to the scheme, the GPS control signal and the antenna tunnel control signal are processed through the logic circuit 70, and when the GPS receives the signal, if the main interfering radio frequency is transmitted, the main radio frequency signal is controlled through the upper level, the main radio frequency transmitting power is reduced, and then the interference of the main radio frequency to the GPS is reduced. Therefore, the combined action of the control signal of the GPS receiving circuit and the control signal of the main radio-frequency antenna tunnel is utilized, when the main radio frequency and the GPS work together, if the interference exists in the actual test, the upper radio frequency sends the control signal to the radio-frequency transceiver 10, and the main radio-frequency interference is reduced.

In some embodiments, the first amplifier 20 is a PA amplifier and the second amplifier 90 is an LNA amplifier.

In some embodiments, the first low pass filter 40 and the second low pass filter 110 are of the type RFLPF1005040YM1T 76.

To sum up, the utility model discloses a theory of operation as follows:

the utility model provides a pair of reduce GPS signal interference's circuit, a serial communication port, include: the GPS receiver comprises an upper computer 120, a radio frequency transceiver 10 and a GPS receiver 80, wherein the radio frequency transceiver 10 and the GPS receiver 80 are controlled by signals of the upper computer 120, the radio frequency transceiver 10 is sequentially connected with a first amplifier 20, a duplexer 30, a first low-pass filter 40, an ASM switch 50 and a tuning switch 60, the tuning switch 60 is connected with a main antenna, the radio frequency transceiver 10 is further connected with a logic circuit 70, the logic circuit 70 is connected with the tuning switch 60, the upper computer 120 controls the logic circuit 70 through an interrupt signal, the logic circuit 70 is electrically connected with the GPS receiver 80, the GPS receiver 80 is further sequentially connected with a second amplifier 90, a SAW filter 100 and a second low-pass filter 110, the second low-pass filter 110 is connected with a GPS antenna, and the logic circuit 70 is connected with the second amplifier 90. The GPS receiving circuit control signal and the main radio frequency antenna tunnel control signal are used for acting together, when the GPS receiving circuit control signal and the main radio frequency antenna tunnel control signal are used as an interrupt signal of the upper computer 120, the GPS control signal and the antenna tunnel control signal are processed through the logic circuit 70, when the GPS receives, if the main radio frequency with interference is transmitted, the upper position sends the control signal to the radio frequency transceiver 10, the main radio frequency transmitting power is reduced, and the interference of the main radio frequency to the GPS is reduced in a hardware circuit mode.

It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.

Claims

1. A circuit for reducing GPS signal interference, comprising: the GPS receiver comprises an upper computer, a radio frequency transceiver and a GPS receiver, wherein the upper computer controls signals of the radio frequency transceiver and the GPS receiver, the radio frequency transceiver is sequentially connected with a first amplifier, a duplexer, a first low-pass filter, an ASM switch and a tuning switch, the tuning switch is connected with a main antenna, the radio frequency transceiver is further connected with a logic circuit, the logic circuit is connected with the tuning switch, the upper computer controls the logic circuit through an interrupt signal, the logic circuit is electrically connected with the GPS receiver, the GPS receiver is further sequentially connected with a second amplifier, an SAW filter and a second low-pass filter, the second low-pass filter is connected with the GPS antenna, and the logic circuit is connected with the second amplifier.

2. The circuit for reducing GPS signal interference of claim 1, wherein the first amplifier is a PA amplifier and the second amplifier is an LNA amplifier.

3. The circuit for reducing GPS signal interference of claim 1, wherein the first low pass filter and the second low pass filter are RFLPF1005040YM1T 76.