CN216696688U - GPS anti-jamming circuit and mobile terminal - Google Patents
GPS anti-jamming circuit and mobile terminal Download PDFInfo
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- CN216696688U CN216696688U CN202122738549.9U CN202122738549U CN216696688U CN 216696688 U CN216696688 U CN 216696688U CN 202122738549 U CN202122738549 U CN 202122738549U CN 216696688 U CN216696688 U CN 216696688U
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Abstract
The utility model discloses a GPS anti-interference circuit and a mobile terminal, comprising: the system comprises a GPS receiving module, a radio frequency chip, a radio frequency transceiving module and an attenuation module; the GPS receiving module is electrically connected with the attenuation module and used for outputting a first enabling signal to the attenuation module; the radio frequency chip is electrically connected with the attenuation module and used for outputting a second enabling signal to the attenuation module; the radio frequency transceiving module is electrically connected with the attenuation module, the attenuation module is provided with a first attenuation network unit and a second attenuation network unit with different attenuation decibels, and the attenuation module is used for switching the first attenuation network unit or the second attenuation network unit to access the circuit according to a first enabling signal and a second enabling signal so that the radio frequency transceiving module outputs a power feedback signal to the radio frequency chip through the first attenuation network unit or the second attenuation network unit; the radio frequency chip is electrically connected with the radio frequency transceiving module and used for adjusting the output power of the radio frequency transceiving module according to the power feedback signal.
Description
Technical Field
The utility model relates to the technical field of communication, in particular to a GPS anti-interference circuit and a mobile terminal.
Background
The GPS (Global Positioning System) is a high-precision radio navigation Positioning System based on artificial earth satellites, and can provide accurate geographical position, vehicle speed and precise time information anywhere in the world and in the near-earth space. Because the GPS signal strength is weak, it is easy to receive interference from other signals, and especially in the mobile terminal, the transmission frequency of the radio frequency module is close to the GPS operating frequency, which is not favorable for ensuring the signal quality received by the GPS. The current solution on the market is to reduce the transmission power of the specific operating frequency band of other signals on the software radio frequency driving level, but the software system development difficulty of the solution is large, and on the mobile terminal, when the GPS and the radio frequency module are in two different software systems, the solution is extremely difficult to implement.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the utility model provides a GPS anti-jamming circuit and mobile terminal to solve the interference of radio frequency signal to GPS signal from the hardware level.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
a GPS jamming immunity circuit, comprising: the system comprises a GPS receiving module, a radio frequency chip, a radio frequency transceiving module and an attenuation module;
the GPS receiving module is electrically connected with the attenuation module and used for outputting a first enabling signal to the attenuation module;
the radio frequency chip is electrically connected with the attenuation module and is used for outputting a second enabling signal to the attenuation module;
the radio frequency transceiver module is electrically connected with the attenuation module, the attenuation module is provided with a first attenuation network unit and a second attenuation network unit with different attenuation decibels, and the attenuation module is used for switching the access circuit of the first attenuation network unit or the second attenuation network unit according to the first enabling signal and the second enabling signal so that the radio frequency transceiver module outputs a power feedback signal to the radio frequency chip through the first attenuation network unit or the second attenuation network unit;
the radio frequency chip is electrically connected with the radio frequency transceiver module and is used for adjusting the output power of the radio frequency transceiver module according to the power feedback signal.
Further, the attenuation module includes:
the logic unit is respectively electrically connected with the radio frequency chip and the GPS receiving module and is used for receiving the first enabling signal and the second enabling signal and outputting a switching signal;
and the switching unit is respectively electrically connected with the first attenuation network unit, the second attenuation network unit, the radio frequency chip, the radio frequency transceiver module and the logic unit and is used for switching the access circuit of the first attenuation network unit or the second attenuation network unit according to the switching signal.
Further, the switching unit includes:
the input end of the first switch is connected with the radio frequency transceiving module, the first output end of the first switch is connected with one end of a first attenuation network unit, the second output end of the first switch is connected with one end of a second attenuation network unit, and the switching signal receiving end of the first switch is connected with the logic unit;
a first input end of the second switch is connected with the other end of the first attenuation network unit; the second input end of the second switch is connected with the other end of the second attenuation network unit, the output end of the second switch is connected with the radio frequency chip, and the switching signal receiving end of the second switch is connected with the logic unit.
Furthermore, the logic unit comprises an and logic unit, a first input end of the and logic unit is connected with the GPS receiving module, a second input end of the and logic unit is connected with the radio frequency chip, and an output end of the and logic unit is connected with the switching unit.
Further, the GPS transceiver module includes: the GPS antenna, the GPS chip and the low noise amplifier;
the GPS antenna is connected with the low noise amplifier, and the low noise amplifier is respectively connected with the logic unit and the GPS chip;
the low noise amplifier is used for outputting the corresponding first enabling signal according to the working state of the GPS antenna.
Further, the GPS receiving module further includes:
the first filter is respectively connected with the GPS antenna and the low noise amplifier;
and the second filter is respectively connected with the low noise amplifier and the GPS chip.
Furthermore, the first attenuation network unit and the second attenuation network unit are both pi-type attenuation network units.
Further, the radio frequency transceiver module includes: the radio frequency transmitting antenna, the coupler and the power amplifier;
the radio frequency transmitting antenna is connected with the coupler, the coupler is respectively connected with the power amplifier and the attenuation module, and the power amplifier is connected with the radio frequency chip;
wherein the coupler is configured to output the power feedback signal to the attenuation module.
Further, the radio frequency transceiver module further includes: the frequency band selection switch, the third filter and the signal amplifier;
the frequency band selection switch is connected with the coupler and the third filter, and the third filter is connected with the signal amplifier.
A mobile terminal comprises the GPS anti-jamming circuit.
The utility model has the beneficial effects that: by arranging the attenuation module, the attenuation module switches the first attenuation network unit or the second attenuation network unit access circuit according to the first enabling signal and the second enabling signal, the first attenuation network unit and the second attenuation network unit have difference values in attenuation decibels, and when the radio frequency chip is switched in the attenuation network unit, the transmitting power of the radio frequency transceiver module is judged to be larger according to the power feedback signal, so that the output power of the radio frequency transceiver module is reduced, and GPS signals are prevented from being interfered.
Drawings
FIG. 1 is a schematic block diagram of a GSM1800 and GPS receiver of a prior art mobile terminal;
FIG. 2 is a schematic block diagram of a GPS jamming circuit of an embodiment of the present invention;
FIG. 3 is another schematic block diagram of a GPS jamming immunity circuit in accordance with an embodiment of the present invention;
FIG. 4 is yet another schematic block diagram of a GPS jamming immunity circuit of an embodiment of the present invention;
FIG. 5 is a schematic diagram of a first attenuation circuit in accordance with an embodiment of the present invention;
fig. 6 is a schematic diagram of a second attenuation circuit in accordance with an embodiment of the present invention.
Description of reference numerals:
100. a radio frequency transceiver module; 110. a power amplifier; 120. a frequency band selection switch; 130. a coupler; 140. a radio frequency transmit antenna; 200. a radio frequency chip; 300. an attenuation module; 310. a first attenuating network element; 320. a second attenuating network element; 330. a logic unit; 340. a switching unit; 341. a first switch; 342. a second switch; 400. a GPS receiving module; 410. a low noise amplifier; 420. a GPS antenna; 430. a GPS chip; 440. a first filter; 450. a second filter.
Detailed Description
In order to explain the technical contents, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The strength of the GPS signal received by the mobile terminal is-120 dBm to 150dBm, and the signal belongs to a weak signal and is easily interfered by other strong signals, so that the GPS positioning function cannot be normally used. At present, frequency bands which are easy to interfere with the GPS signal on the mobile terminal include a GSM1800 frequency Band and an LTE Band13 frequency Band. The GPS center working frequency is 1575.42MHz, the working bandwidth is 2.046MHz, the GSM1800 transmitting signal works from 1710MHz to 1785MHz, the distance to the GPS working frequency is relatively close, when the GPS filter out-of-band rejection degree is low, the GSM1800 transmitting signal can cause the GPS receiving LNA (low noise amplifier) to be saturated, so that the GPS weak signal can not be demodulated, and the GPS positioning function is influenced. The transmission frequency of the LTE Band13 is 777MHz to 787MHz, the frequency doubling 1554MHz to 1574MHz of the LTE Band13 is close to the frequency of GPS signals, so the frequency doubling harmonic of the LTE Band13 can also affect the GPS performance.
Referring to FIG. 1, when the P1dB (1dB compression point) of the GPS receiving LNA is-13 dBm, and the received signal is greater than-13 dBm, the LNA is saturated and the GPS loses the positioning function.
Referring to fig. 2 to 6, an embodiment of the present invention is: a GPS anti-jamming circuit is applied to a mobile terminal and a terminal with a mobile network and a GPS, so as to reduce the interference of radio frequency signals to GPS signals.
Referring to fig. 2, the GPS jamming prevention circuit includes: a GPS receiving module 400, a radio frequency chip 200, a radio frequency transceiver module 100 and an attenuation module 300; the GPS receiving module 400 is electrically connected to the attenuating module 300, and is configured to output a first enable signal to the attenuating module 300; the radio frequency chip 200 is electrically connected to the attenuation module 300, and is configured to output a second enable signal to the attenuation module 300; the radio frequency transceiver module 100 is electrically connected to the attenuation module 300, the attenuation module 300 is provided with a first attenuation network unit 310 and a second attenuation network unit 320 with different attenuation decibels, and the attenuation module 300 is configured to switch an access circuit of the first attenuation network unit 310 or the second attenuation network unit 320 according to the first enable signal and the second enable signal, so that the radio frequency transceiver module 100 outputs a power feedback signal to the radio frequency chip 200 through the first attenuation network unit 310 or the second attenuation network unit 320; the rf chip 200 is electrically connected to the rf transceiver module 100, and is configured to adjust the output power of the rf transceiver module 100 according to the power feedback signal. The GPS module outputs the first enable signal according to a working state of the GPS module, and the rf chip 200 outputs the second enable signal according to a working state of the rf transceiver module 100. In this embodiment, the decibels of attenuation of the second attenuator network element 320 are less than the decibels of attenuation of the first attenuator network element 310.
The working principle of the GPS anti-jamming circuit in this embodiment is as follows: when the mobile terminal is calibrated, the GPS receiving module 400 is turned off by default, the radio frequency transceiver module 100 operates, the attenuation module 300 switches to the first attenuation network unit 310 according to the current first enable signal and the second enable signal, so that the radio frequency transceiver module 100 outputs a power feedback signal to the radio frequency chip 200 through the first attenuation network unit 310, and stores a corresponding calibration radio frequency parameter into the mobile terminal according to the attenuation state of the first attenuation network unit 310, and the radio frequency chip 200 adjusts the transmission power of the radio frequency transceiver module 100 according to the power feedback signal. When the GPS receiving module 400 and the radio frequency transceiver module 100 operate simultaneously, the first enable signal changes, the logic control unit switches to the second attenuation network unit 320 according to the current first enable signal and the current second enable signal, and the radio frequency transceiver module 100 outputs a power feedback signal to the radio frequency chip 200 through the second attenuation network unit 320.
Since the radio frequency chip 200 calls the calibration parameter based on the use of the first attenuation network unit 310 and receives the power feedback signal output by the second attenuation network unit 320, the decibel of the attenuation of the second attenuation network unit 320 is smaller than the decibel of the attenuation of the first attenuation network unit 310, so that the radio frequency chip 200 determines that the transmission power of the radio frequency transceiver module 100 is higher according to the power feedback signal, thereby reducing the transmission power of the radio frequency transceiver module 100. The required insertion loss value is designed on the second attenuation network unit 320 according to the requirement, so that the radio frequency transceiver module 100 can be reduced to the required transmission power.
It can be understood that, with this configuration, when the GPS module and the radio frequency transceiver module 100 operate simultaneously, the second attenuator network unit 320 accesses the circuit, and the radio frequency chip 200 invokes the calibration parameter based on the use of the first attenuator network unit 310, receives the power feedback signal output by the radio frequency transceiver module 100 via the second attenuator network unit 320, and transmits the power of the radio frequency transceiver module 100 according to the power feedback signal, so as to avoid the radio frequency transceiver module 100 from interfering with the GPS signal on a hardware level.
Referring to fig. 2, the attenuation module 300 includes: the logic unit 330, the logic unit 330 is electrically connected to the radio frequency chip 200 and the GPS receiving module 400, and is configured to receive the first enable signal and the second enable signal and output a switching signal; the switching unit 340, the switching unit 340 is electrically connected to the first attenuation network unit 310, the second attenuation network unit 320, the rf chip 200, the rf transceiver module 100 and the logic unit 330, respectively, and is configured to switch the access circuit of the first attenuation network unit 310 or the second attenuation network unit 320 according to the switching signal.
It can be understood that the logic unit 330 outputs the switching signal corresponding to the level state according to the level state of the first enable signal and the second enable signal, and the switching unit 340 correspondingly switches the first attenuation network unit 310 or the second attenuation network unit 320 according to the switching signal, so that the radio frequency transceiver module 100 outputs the power feedback signal to the radio frequency chip 200 through the first attenuation network unit 310 or the second attenuation network unit 320.
Specifically, the logic unit 330 is an and logic unit, a first input terminal RX _31 of the and logic unit is connected to the GPS receiving module 400, a second input terminal RX _32 of the and logic unit is connected to the radio frequency chip 200, and an output terminal TX _30 of the and logic unit is connected to the switching unit 340. In this embodiment, when the GPS module operates, the first enable signal is at a high level; when the GPS module does not work, the first enabling signal is at a low level. When the radio frequency transceiver module 100 is in operation, the second enable signal is at a high level; when the rf transceiver module 100 does not operate, the second enable signal is at a low level. Further, when any one of the first enable signal and the second enable signal is at a low level, the switching signal is at a low level, and the switching unit 340 switches the first attenuation network unit 310 to access the circuit; when the first enable signal and the enable signal are both at a high level, the switching signal is at a high level, and the switching unit 340 switches the second attenuation network unit 320 to access the circuit. In this embodiment, the and gate logic unit may use a logic gate circuit composed of discrete elements such as a diode or a triode, or may use a logic gate chip.
Referring to fig. 2 and fig. 3, the switching unit 340 includes: a first switch 341, an input terminal IN _10 of the first switch 341 is connected to the rf transceiver module 100, a first output terminal OUT _11 of the first switch 341 is connected to one end of the first attenuator network unit 310, a second output terminal OUT _12 of the first switch 341 is connected to one end of the second attenuator network unit 320, and a switching signal receiving terminal RX _1 of the first switch 341 is connected to the logic unit 330; a second switch 342, a first input terminal IN _21 of the second switch 342 being connected to the other end of the first attenuation network unit 310; a second input terminal IN _22 of the second switch 342 is connected to the other end of the second attenuator network unit 320, an output terminal OUT _20 of the second switch 342 is connected to the rf chip 200, and a switching signal receiving terminal RX _2 of the second switch 342 is connected to the logic unit 330.
In this embodiment, the logic unit 330 outputs the switching signal according to the first enable signal and the second enable signal, a switching signal receiving end of the first switch 341 receives the switching signal, and controls an input end to communicate with the first output end OUT _11 or the second output end OUT _12 according to the switching signal; and a switching signal receiving end of the second control switch receives the switching signal, and controls the output end to be communicated with the first input end IN _21 or the second input end IN _22 according to the switching signal. Further, when any one of the first enable signal and the second enable signal is at a low level, the switching signal is at a low level, the input terminal of the first switch 341 is communicated with the first output terminal OUT _11, and the output terminal of the second switch 342 is communicated with the first input terminal IN _21, so that the first attenuation network unit 310 is connected to the circuit. When the first enable signal and the second enable signal are both at a high level, the radio frequency transceiver module 100 and the GPS receiving module 400 simultaneously operate at the same time, the switching signal is at a high level, the input end of the first switch 341 is communicated with the second output end OUT _12, and the output end of the second switch 342 is communicated with the second input end IN _22, so that the second attenuation network unit 320 is connected to the circuit, the radio frequency chip 200 receives the power feedback signal output by the second attenuation network unit 320, determines that the transmitting power of the radio frequency transceiver module 100 is high, adjusts and reduces the transmitting power of the radio frequency transceiver module 100, and avoids the radio frequency signal from interfering with the GPS signal.
Referring to fig. 4, the GPS transceiver module includes: a GPS antenna 420, a GPS chip 430, and a low noise amplifier 410; the GPS antenna 420 is connected to the low noise amplifier 410, and the low noise amplifier 410 is respectively connected to the logic unit 330 and the GPS chip 430; the low noise amplifier 410 is configured to output the corresponding first enable signal according to an operating state of the GPS antenna 420. Further, the GPS receiving module 400 further includes: a first filter 440, wherein the first filter 440 is respectively connected to the GPS antenna 420 and the low noise amplifier 410; a second filter 450, wherein the second filter 450 is respectively connected to the low noise amplifier 410 and the GPS chip 430. In this embodiment, when the GPS antenna 420 operates, the first enable signal is at a high level; the first enable signal is low when the GPS antenna 420 is not operating. The first filter 440 is used for protecting the low noise amplifier 410, avoiding saturation of the low noise amplifier 410, and enhancing rejection of the GPS out-of-band clutter signals; the second filter 450 is used to protect the GPS chip 430, prevent the low noise amplifier 410 of the GPS signal chip from being saturated, and enhance the degree of suppression of the GPS out-of-band clutter signals.
Referring to fig. 5 and fig. 6, in the present embodiment, the first attenuation network unit 310 and the second attenuation network unit 320 are both pi-type attenuation network units. Specifically, the first attenuation network unit 310 includes a first resistor R1, a second resistor R2, and a third resistor R3; one end of the first resistor R1 is connected to the first output terminal OUT _11 of the first switch 341, and the other end of the first resistor R1 is connected to the first input terminal IN _21 of the second switch 342; one end of the second resistor R2 is connected with one end of the first resistor R1, and the other end of the second resistor R2 is grounded; one end of the third resistor R3 is connected to the other end of the first resistor R1, and the other end of the third resistor R3 is grounded. The second attenuation network unit 320 includes a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; one end of the fourth resistor R4 is connected to the second output terminal OUT _12 of the first switch 341, and the other end of the fourth resistor R4 is connected to the second input terminal IN _22 of the second switch 342; one end of the fifth resistor R5 is connected with one end of the fourth resistor R4, and the other end of the fifth resistor R5 is grounded; one end of the sixth resistor R6 is connected to the other end of the fourth resistor R4, and the other end of the sixth resistor R6 is grounded.
In this embodiment, the rf transceiver module 100 includes: a radio frequency transmitting antenna 140, a coupler 130, and a power amplifier 110; the rf transmitting antenna 140 is connected to the coupler 130, the coupler 130 is respectively connected to the power amplifier 110 and the attenuation module 300, and the power amplifier 110 is connected to the rf chip 200; wherein the coupler 130 is configured to output the power feedback signal to the attenuation module 300. Further, the radio frequency transceiver module 100 further includes: a frequency band selection switch 120, a third filter, and a signal amplifier; the band selection switch 120 is connected to the coupler 130 and the third filter, and the third filter is connected to the signal amplifier. The rf chip 200 outputs the corresponding second enable signal according to the working state of the rf transmitting antenna 140, and when the rf transmitting antenna 140 works, the second enable signal is at a high level; when the rf transmitting antenna 140 does not operate, the second enable signal is at a low level.
Illustratively, the radio frequency transceiver module 100 is configured to transmit and receive a radio frequency signal of LTE Band13, the first attenuation network unit 310 provides 10dB of attenuation, when performing calibration, power sampling is performed by 10dB of attenuation calibration, and a radio frequency parameter record is stored in the mobile terminal device, and when the radio frequency transmitting antenna 140 operates, the radio frequency chip 200 outputs the second enable signal of high level to the logic unit 330. When the GPS is in operation, the low noise amplifier 410 outputs the first enable signal with a high level, the logic unit 330 outputs the switching signal with a high level according to the current first enable signal and the second enable signal, and the switching unit 340 switches from the first attenuating network unit 310 to the second attenuating network unit 320 according to the switching signal. In order to reduce the power of the LTE Band13 transmitted by 6dB, the second attenuation network element 320 is designed as a 4dB insertion loss attenuation network element. At this time, the calibration parameter called by the rf chip 200 based on the use of the first attenuation network unit 310 receives the power feedback signal output by the rf transceiver module 100 through the second attenuation network unit 320, so that the rf chip 200 determines that the power of the rf transceiver module 100 is larger based on the current power feedback signal, and the rf chip 200 sends smaller power, and since the power amplifier 110 performs fixed gain amplification under the previous calibration parameter, the transmission power of the rf transmitting antenna 140 at this time is reduced by 6dB after being amplified by the power amplifier 110 compared with that when the first attenuation network unit 310 is used.
In summary, according to the GPS anti-jamming circuit and the mobile terminal provided by the present invention, the attenuation module is arranged, and the attenuation module switches the first attenuation network unit or the second attenuation network unit to access the circuit according to the first enable signal and the second enable signal, where there is a difference in the attenuation decibels between the first attenuation network unit and the second attenuation network unit, and when the radio frequency chip switches between the attenuation network units, the transmission power of the radio frequency transceiver module is determined to be greater according to the power feedback signal, so as to reduce the signal transmission power of the radio frequency transceiver module, thereby preventing the GPS signal from being interfered. Meanwhile, the attenuation module comprises a switching unit and a logic unit, the logic unit outputs a switching signal according to the first enabling signal and the second enabling signal, the switching unit correspondingly switches the first attenuation network unit or the second attenuation network unit to access the circuit according to the switching signal, and the design is ingenious. In addition, the GPS receiving module is provided with a filter, which is favorable for avoiding the saturation of the low noise amplifier and enhancing the suppression degree of the out-of-band clutter signals of the GPS.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the contents of the present specification and the drawings, or applied to the related technical fields directly or indirectly, are included in the scope of the present invention.
Claims (10)
1. A GPS jamming immunity circuit, comprising: the system comprises a GPS receiving module, a radio frequency chip, a radio frequency transceiving module and an attenuation module;
the GPS receiving module is electrically connected with the attenuation module and used for outputting a first enabling signal to the attenuation module;
the radio frequency chip is electrically connected with the attenuation module and is used for outputting a second enabling signal to the attenuation module;
the radio frequency transceiver module is electrically connected with the attenuation module, the attenuation module is provided with a first attenuation network unit and a second attenuation network unit with different attenuation decibels, and the attenuation module is used for switching the access circuit of the first attenuation network unit or the second attenuation network unit according to the first enabling signal and the second enabling signal so that the radio frequency transceiver module outputs a power feedback signal to the radio frequency chip through the first attenuation network unit or the second attenuation network unit;
the radio frequency chip is electrically connected with the radio frequency transceiver module and is used for adjusting the output power of the radio frequency transceiver module according to the power feedback signal.
2. The GPS jamming immunity circuit of claim 1, wherein the attenuation module comprises:
the logic unit is respectively electrically connected with the radio frequency chip and the GPS receiving module and is used for receiving the first enabling signal and the second enabling signal and outputting a switching signal;
and the switching unit is respectively electrically connected with the first attenuation network unit, the second attenuation network unit, the radio frequency chip, the radio frequency transceiver module and the logic unit and is used for switching the access circuit of the first attenuation network unit or the second attenuation network unit according to the switching signal.
3. The GPS jamming immunity circuit of claim 2, wherein the switching unit comprises:
the input end of the first switch is connected with the radio frequency transceiving module, the first output end of the first switch is connected with one end of a first attenuation network unit, the second output end of the first switch is connected with one end of a second attenuation network unit, and the switching signal receiving end of the first switch is connected with the logic unit;
a first input end of the second switch is connected with the other end of the first attenuation network unit; the second input end of the second switch is connected with the other end of the second attenuation network unit, the output end of the second switch is connected with the radio frequency chip, and the switching signal receiving end of the second switch is connected with the logic unit.
4. The GPS anti-jamming circuit according to claim 2, wherein the logic unit is an AND logic unit, a first input end of the AND logic unit is connected to the GPS receiving module, a second input end of the AND logic unit is connected to the radio frequency chip, and an output end of the AND logic unit is connected to the switching unit.
5. The GPS jamming immunity circuit of claim 2, wherein the GPS transceiver module comprises: the GPS antenna, the GPS chip and the low noise amplifier;
the GPS antenna is connected with the low noise amplifier, and the low noise amplifier is respectively connected with the logic unit and the GPS chip;
the low noise amplifier is used for outputting the corresponding first enabling signal according to the working state of the GPS antenna.
6. The GPS interference rejection circuit according to claim 5, wherein said GPS receiver module further comprises:
the first filter is respectively connected with the GPS antenna and the low noise amplifier;
and the second filter is respectively connected with the low noise amplifier and the GPS chip.
7. The GPS jammer rejection circuit of claim 1, wherein said first attenuating network element and said second attenuating network element are both pi-type attenuating network elements.
8. The GPS jamming immunity circuit of claim 1, wherein the radio frequency transceiver module comprises: the radio frequency transmitting antenna, the coupler and the power amplifier;
the radio frequency transmitting antenna is connected with the coupler, the coupler is respectively connected with the power amplifier and the attenuation module, and the power amplifier is connected with the radio frequency chip;
wherein the coupler is configured to output the power feedback signal to the attenuation module.
9. The GPS jamming immunity circuit of claim 8, wherein the radio frequency transceiver module further comprises: the frequency band selection switch, the third filter and the signal amplifier;
the frequency band selection switch is connected with the coupler and the third filter, and the third filter is connected with the signal amplifier.
10. A mobile terminal comprising a GPS jamming circuit according to any of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122738549.9U CN216696688U (en) | 2021-11-09 | 2021-11-09 | GPS anti-jamming circuit and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122738549.9U CN216696688U (en) | 2021-11-09 | 2021-11-09 | GPS anti-jamming circuit and mobile terminal |
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| CN216696688U true CN216696688U (en) | 2022-06-07 |
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