Matched circuit of antenna, satellite navigation positioning module and vehicle

Abstract

The utility model discloses a matching circuit of an antenna, a satellite navigation positioning module and a vehicle, and relates to the field of antennae, a power supply circuit can utilize a power supply connected with an input end to supply power to the antenna when the power supply circuit is switched on, and a signal processing circuit receives an antenna signal and carries out filtering processing on the antenna signal. The accuracy and reliability of the finally received antenna signal are ensured, and the detection circuit can detect the installation state of the antenna according to the internal voltage of the power supply circuit connected with the input end. The detection circuit, the signal processing circuit and the power supply circuit are arranged in a matched circuit of the antenna, the functions of power supply, installation detection, signal processing and the like of the antenna are met at the same time, normal work of the antenna is ensured, multiple functions of the antenna are achieved, and the anti-interference capability of the antenna is improved through signal processing and independent power supply; and reliable work of the whole antenna is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of antenna, especially a kind of antenna's supporting circuit, satellite navigation positioning module and vehicle. BACKGROUND

[0002] With the continuous development of the field of automobiles, the application of GNSS (Global Navigation Satellite System) is also more and more widely, GNSS built-in high-precision measurement engine, navigation engine, inertial navigation unit, etc., can utilize the antenna signal received by antenna to help the driver realize the real-time positioning of the car and the collection of the attitude information of the car itself and other functions. In order to cope with the reception of satellite signals and the collection of high-precision position and attitude information in various harsh environments, the power supply of the antenna, the received antenna signal and other information need to be processed to meet the requirements of anti-interference and functional safety; therefore, how to set up the supporting circuit of the antenna to ensure the reliable operation of the antenna has become a technical problem that needs to be solved urgently. SUMMARY

[0003] The utility model aims at providing a kind of antenna's supporting circuit, satellite navigation positioning module and vehicle, meet the power supply of antenna, installation detection and signal processing and other functions simultaneously, ensure the normal operation of antenna, realize the multiple functions of antenna, improve the anti-interference ability of antenna by signal processing and independent power supply, ensure the reliable operation of entire antenna.

[0004] To solve the above technical problems, the utility model provides a kind of antenna's supporting circuit, comprising:

[0005] Power supply circuit, input end is connected with power supply, output end is connected with antenna, is used to utilize the power supply for the power supply of antenna;

[0006] Signal processing circuit, input end is connected with the antenna, is used to filter processing antenna signal output by the antenna;

[0007] Detection circuit, input end is connected with the power supply circuit, is used to detect whether the antenna is normally installed according to the voltage in the power supply circuit;

[0008] Processor, signal receiving end is connected with the output end of signal processing circuit, to obtain antenna signal by signal receiving end;Power supply control end is connected with the control end of power supply circuit, to control the power supply circuit conduction by power supply control end;Detection end is connected with the output end of detection circuit, to determine whether the antenna is normally installed by detection end.

[0009] Optionally, the power supply circuit comprises:

[0010] The magnetic bead is connected with the power supply at the input end and is used for filtering high-frequency noise in the power supply.

[0011] The first resistor is connected with the output end of the magnetic bead at the first end.

[0012] The power supply switch is connected with the second end of the first resistor at the first end, is connected with the power supply control end of the processor at the control end, and is used for being turned on based on the control of the processor when the antenna needs to work.

[0013] The second resistor is grounded at the first end.

[0014] The first capacitor is grounded at the first end, and is connected with the second end of the power supply switch, the second end of the second resistor and the antenna at the second end respectively.

[0015] Optionally, the power supply circuit further comprises:

[0016] The first inductor is connected with the second end of the power supply switch, the second end of the second resistor and the second end of the first capacitor at the first end respectively.

[0017] The second capacitor is grounded at the first end.

[0018] The second inductor is connected with the second end of the first inductor and the second end of the second capacitor at the first end, and is connected with the antenna at the second end.

[0019] Optionally, the detection circuit comprises:

[0020] The third resistor is connected with the second end of the magnetic bead, the first end of the first resistor and the power supply at the first end.

[0021] The fourth resistor is grounded at the first end.

[0022] The fifth resistor is connected with the second end of the third resistor and the second end of the fourth resistor at the first end.

[0023] The sixth resistor is connected with the second end of the first resistor and the first end of the power supply switch at the first end.

[0024] The comparator is connected with the second end of the fifth resistor at the first input end, is connected with the second end of the sixth resistor at the second input end, is connected with the detection end of the processor at the output end, is connected with the preset power supply at the power supply end, and is grounded at the ground end.

[0025] Optionally, the detection circuit further comprises:

[0026] The pull-up resistor is connected with the power supply at the first end, and is connected with the output end of the comparator and the detection end of the processor at the second end respectively.

[0027] and / or,

[0028] A third capacitor, a first end of which is connected to the power supply and a power supply end of the comparator respectively, and a second end of which is grounded.

[0029] Optionally, the signal processing circuit comprises:

[0030] A first filter capacitor, a first end of which is grounded;

[0031] A filter resistor, a first end of which is connected to a second end of the first filter capacitor and the antenna respectively;

[0032] A second filter capacitor, a first end of which is grounded, and a second end of which is connected to a second end of the filter resistor and a signal receiving end of the processor respectively.

[0033] Optionally, the signal processing circuit further comprises:

[0034] A short-circuit protection circuit, an input end of which is connected to the antenna, and an output end of which is connected to a protection end of the processor, for triggering the processor to control the power supply circuit to be turned off when the antenna is short-circuited.

[0035] Optionally, the short-circuit protection circuit comprises:

[0036] An AND gate, a first input end and a second input end of which are connected to each other, and an output end of which is connected to the protection end of the processor, and a ground end of which is grounded;

[0037] A seventh resistor, a first end of which is connected to the antenna and an output end of the power supply circuit respectively, and a second end of which is connected to a common connection point of the first input end and the second input end of the AND gate;

[0038] A fourth capacitor, a first end of which is connected to the power supply and a power supply end of the AND gate respectively, and a second end of which is grounded.

[0039] To solve the above technical problems, the utility model further provides a satellite navigation positioning module, including antenna and antenna's supporting circuit as described above, antenna's supporting circuit with antenna is connected.

[0040] To solve the above technical problems, the utility model further provides a vehicle, including satellite navigation positioning module as described above.

[0041] The utility model provides a kind of antenna's supporting circuit, including power supply circuit, signal processing circuit, detection circuit and processor, power supply circuit can utilize power supply connected by input end to power supply antenna when conducting, signal processing circuit receives antenna signal, and antenna signal is filtered and handled, ensure the accuracy and reliability of antenna signal finally received, detection circuit can detect the installation state of antenna according to the internal voltage of power supply circuit connected by input end.The detection circuit, signal processing circuit and power supply circuit are arranged in the supporting circuit of antenna, meet the power supply of antenna, installation detection and signal processing etc.

[0042] The utility model further provides a satellite navigation positioning module and vehicle, has same beneficial effect with the supporting circuit of above-mentioned antenna. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed in prior art and embodiment will be simply introduced as follows, obviously, the drawings in the following description only some embodiments of the utility model, for ordinary skilled person in the art, without paying creative labor, other drawings can also be obtained according to these drawings.

[0044] Figure 1 The utility model provides a kind of antenna's supporting circuit's structural schematic diagram;

[0045] Figure 2 The utility model provides another kind of antenna's supporting circuit's structural schematic diagram;

[0046] Figure 3 The utility model provides a kind of processor signal module's structural schematic diagram;

[0047] Figure 4 The utility model provides a kind of processor ground module's structural schematic diagram;

[0048] Figure 5 The utility model provides a kind of power supply's circuit structure schematic diagram. DETAILED DESCRIPTION

[0049] The core of the utility model is to provide a kind of antenna's supporting circuit, satellite navigation positioning module and vehicle, meet the power supply of antenna, installation detection and signal processing etc.

[0050] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0051] Please refer to Figure 1 , Figure 1 The utility model provides a kind of antenna's matched circuit's structure schematic diagram;Please refer to Figure 2 , Figure 2 Another kind of antenna's matched circuit's structure schematic diagram provided by the utility model is provided. To solve the above technical problems, the utility model provides a kind of antenna's matched circuit, comprising:

[0052] Power supply circuit 1, input end is connected with power supply, output end is connected with antenna, for using power supply to power supply for antenna;

[0053] Signal processing circuit 2, input end is connected with antenna, for filtering processing to antenna signal that antenna exports;

[0054] Detection circuit 3, input end is connected with power supply circuit 1, for detecting whether antenna is normally installed according to voltage in power supply circuit 1;

[0055] Processor 4, signal receiving end is connected with the output end of signal processing circuit 2, to obtain antenna signal by signal receiving end;Power supply control end is connected with the control end of power supply circuit 1, to control power supply circuit 1 to be turned on by power supply control end;Detection end is connected with the output end of detection circuit 3, to determine whether antenna is normally installed by detection end.

[0056] Specifically, considering that part of the antenna needs to be powered to normally transmit signals and receive signals, a power supply circuit 1 for supplying power to the antenna is arranged in the antenna supporting circuit, and the power supply circuit 1 can be turned on or turned off under the control of the processor 4, when the power supply circuit 1 is turned on, the power supply can supply power to the antenna through the turned-on power supply circuit 1, supporting the normal work of the antenna. At the same time, a signal processing circuit 2 is also arranged in the antenna supporting circuit, which is used to realize the transmission between the antenna signal and the processor 4 in the working process of the antenna, and can filter the antenna signal to filter out the signal noise, thereby improving the accuracy of the antenna signal received by the processor 4. In order to ensure the normal application of the antenna, a detection circuit 3 is also arranged in the antenna supporting circuit, which is used to detect whether the antenna is normally installed, when the antenna is normally installed, the power supply circuit 1 can normally supply power to the antenna, and when the antenna is not normally installed, although the power supply circuit 1 is connected to the power supply, the output voltage cannot be normally output to the antenna, so the detection circuit 3 can use the voltage in the power supply circuit 1 to check whether the antenna is normally installed, to ensure that the antenna can normally work under the premise of normal installation.

[0057] It is not difficult to understand that the processor 4 cooperates with the power supply circuit 1 to control whether to supply power to the antenna, cooperates with the signal processing circuit 2 to realize the reception of the antenna signal and realizes the positioning function when the antenna signal is received, and cooperates with the detection circuit 3 to ensure the normal installation of the antenna; thereby improving the functional safety of the antenna, the anti-interference ability of the whole circuit design is strong, and it is ensured that the antenna can accurately realize the function.

[0058] It should be noted that the specific types and implementation modes of the antenna, the power supply circuit 1, the signal processing circuit 2, the detection circuit 3 and the processor 4 are not particularly limited in the present application, the antenna can be arranged in the GNSS module to realize the positioning function, or can be arranged in other application scenarios requiring radio frequency signals, the processor 4 can also be selected according to the functional requirements of the specific application scenario, and the voltage level and implementation mode of the power supply are not particularly limited in the present application, and can be realized by adopting an LDO (Low-dropout regulator, low-dropout regulator) power supply and the like. When the vehicle-mounted GNSS module adopts an antenna to receive signals, the processor 4 needs to adopt a processing chip that can provide continuous, real-time and reliable high-precision position information through the antenna signal, and can adopt a chip of M21 type, which can effectively cope with satellite signal interference, shielding and other harsh environments, and has a built-in high-precision measurement engine, navigation engine, inertial navigation unit and the like. Please refer to Figure 3 Figure 3 The utility model provides a kind of structure schematic diagram of processor signal module;Please refer to Figure 4 ,​Figure 4 The utility model provides a kind of structure diagram of processor grounding module;Can be implemented processor 4 using M21A.M21A schematic diagram is divided into two parts, one part is the TU3-1 where power supply and signal are located, another part is TU3-2 for implementing the grounding of entire chip, each grounding pin in chip is unifiedly grounded by TU3-2.Processor 4 is connected with external antenna by connector J1, and the MH1, MH2, MH3 and MH4 pins of connector J1 are grounded.Radio frequency signal received by antenna enters the RF_IN (PIN2) pin of M21A by connector J1, and M21A can process radio frequency signal and interact information with the SOC (System on Chip, system level chip) of vehicle, accurately locate vehicle position, more accurately prompt vehicle speed and lane change in highway and other occasions, improve driving safety and driving experience.

[0059] As a specific embodiment, as Figure 3As shown, the processor 4 is implemented by using the M21A, the RESET_N (PIN49) pin of the M21A is connected to the SOC output SOC_GPIO2 signal, which is a reset signal and is low active, when the SOC outputs the low SOC_GPIO2 signal, the processor 4 is reset; meanwhile, the ground capacitor TC8 connected to the RESET_N (PIN49) pin is set to play a filtering role, to improve the accuracy and reliability of the reset function of the processor 4. The RMII_TXD1 / UART3_RX (PIN26) pin of the M21A is connected to the SOC_UART1_TXD port of the SOC, the UART3_TX (PIN27) pin is connected to the SOC_UART1_RXD port of the SOC, the UART2_TX / SPI_MISO (PIN42) pin is connected to the SOC_UART2_TXD port of the SOC, the UART2_RX / SPI_MOSI (PIN43) pin is connected to the SOC_UART2_RXD port of the SOC, and the processor 4 exchanges information with the SOC through the four ports; meanwhile, the resistors TR14, TR15, TR16 and TR17 connected in series at the four pins are used as impedance matching resistors to protect the processor 4. The VCC_33 (PIN33) pin and the VCC_34 (PIN34) pin of the M21A are used as power supply pins of the processor 4, and are connected to the power supply 3V3_M21 of the processor 4, and meanwhile, the ground capacitors TC9, TC10, TC11, TC12 and TC13 connected to the pins are used to play a filtering and voltage stabilizing role, to ensure that the processor 4 can receive stable and reliable power supply voltage. The TIMEPULSE (PIN53) pin of the M21A is used to output the M21_TIMEPULSE signal, and the pin is used to output a time synchronization signal to the SOC; the RTK_STAT (PIN20) pin of the M21A is used to output the M21_RTK_STAT signal, and the pin is used to output an RTK (Real-Time Kinematic) state indication to the SOC, to facilitate the cooperation control between the SOC and the processor 4, and meanwhile, the resistors TR11 and TR12 connected in series at the two pins are set. The ANT_DETECT (PIN4) pin of the M21A is used as a detection end of the processor 4, the ANT_OFF (PIN5) pin is used as a power supply control end of the processor 4, and the ANT_SHORT_N (PIN6) is used as a protection end of the processor 4.

[0060] The utility model provides a kind of antenna's supporting circuit, including power supply circuit 1, signal processing circuit 2, detection circuit 3 and processor 4, power supply circuit 1 can utilize the power supply connected by input end when conducting to power supply antenna, signal processing circuit 2 receives antenna signal, and antenna signal is filtered and handled, ensure the accuracy and reliability of antenna signal received finally, detection circuit 3 can detect the installation state of antenna according to the internal voltage of power supply circuit 1 connected by input end.Through being provided with detection circuit 3, signal processing circuit 2 and power supply circuit 1 in the supporting circuit of antenna, it simultaneously satisfies the power supply of antenna, installation detection and signal processing etc.

[0061] On the basis of the above embodiment:

[0062] As an optional embodiment, power supply circuit 1 includes:

[0063] Magnetic bead TF0, input end is connected with power supply, for filtering high-frequency noise in power supply;

[0064] First resistor R1, first end is connected with the output end of magnetic bead TF0;

[0065] Power supply switch Q0, first end is connected with the second end of first resistor R1, control end is connected with the power supply control end of processor 4, for when needing antenna to work based on the control of processor 4 conduction;

[0066] Second resistor R2, first end is grounded;

[0067] First capacitor C1, first end is grounded, second end is respectively connected with the second end of power supply switch Q0, the second end of second resistor R2 and antenna.

[0068] It is not difficult to understand that the power supply circuit 1 provides the antenna and the power supply path of the GNSS module. The power supply circuit 1 specifically includes a magnetic bead TFO, a first resistor R1, a power supply switch QO, a second resistor R2 and a first capacitor C1. The voltage output by the power supply is first passed through the magnetic bead TFO. The magnetic bead TFO can play a role in filtering high frequencies, so that the accuracy of the voltage output to the first end of the first resistor R1 is higher. The first resistor R1 is connected in series with the power supply switch QO, which can play a role in current limiting. The second resistor R2 and the first capacitor C1 are connected in parallel and grounded. The first capacitor C1 can play a role in filtering. At the same time, the second resistor R2 can cooperate with the first resistor R1 to form a voltage dividing circuit, adjusting the power supply voltage finally output to the antenna. The control end of the power supply switch QO is connected with the processor 4. The processor 4 can control the conduction and shutdown of the power supply switch QO by outputting high and low levels, etc., so as to realize the conduction control of the power supply circuit 1. A resistor TR3 can be further arranged between the control end of the power supply switch QO and the power supply control end of the processor 4 to play a role in current limiting, providing a stable and reliable bias voltage for the power supply switch QO, and avoiding the direct impact of the output signal of the processor 4 on the power supply switch QO. The power supply circuit 1 can further be connected in series with an anti-reverse diode TD1, which is used to define the current flow direction of the power supply circuit 1, prevent the power supply from being reversed, and prevent current from flowing back, etc. A grounded parallel capacitor C5 can also be provided to further filter the voltage output by the magnetic bead TFO, improving the accuracy and reliability of the power supply voltage finally output to the antenna. The specific types, implementation methods and parameter values of the magnetic bead TFO, the first resistor R1, the power supply switch QO, the second resistor R2, the first capacitor C1 and other devices in the power supply circuit 1 are not particularly limited in this application, and device selection can be made with reference to the device parameters in Figure 2 , as shown in Figure 2 , the power supply switch QO can be implemented by a triode.

[0069] Specifically, the power supply circuit 1 can realize the control process of the processor 4 on the antenna power supply by setting the power supply switch QO. The magnetic bead TFO, capacitor devices, etc. can also be set to filter to provide accurate and reliable power supply for the antenna. The circuit structure is simple and easy to implement. The cost of the components used is low, and the volume is small, which is conducive to the simple implementation of the entire power supply circuit 1 and the supporting circuit.

[0070] As an optional embodiment, the power supply circuit 1 further comprises:

[0071] A first inductor L1, the first end of which is connected with the second end of the power supply switch QO, the second end of the second resistor R2 and the second end of the first capacitor C1 respectively;

[0072] A second capacitor C2, the first end of which is grounded;

[0073] The second inductor L2 has a first end connected to the second end of the first inductor L1 and the second end of the second capacitor C2 respectively, and a second end connected to the antenna.

[0074] It can be understood that, in order to further improve the accuracy of the power supply voltage finally output to the antenna, a π-type filter circuit including the first inductor L1, the second capacitor C2 and the second inductor L2 can be additionally arranged at the output end of the power supply circuit 1 to filter out low-frequency noise in the power supply. The specific types, implementation manners and parameter values of the first inductor L1, the second capacitor C2 and the second inductor L2 are not particularly limited herein, and can be referred to in the prior art. Figure 2 A 1UF capacitor is used to implement the second capacitor C2.

[0075] Further, please refer to Figure 5 , Figure 5 The circuit structure schematic diagram of the power supply provided by the utility model. The power supply can be directly implemented by the power supply of the processor 4, further saving cost and reducing size. Meanwhile, in order to guarantee the best performance of the antenna and the GNSS module, the power supply is preferably a low-noise 3.3V LDO power supply dedicated to radio frequency, and the power supply of the M21A chip is also implemented through the 3.3V LDO power supply. As shown in Figure 5 , an LDO power supply PU1 with an output noise voltage less than 53uVRMS, a power supply rejection ratio greater than 35dB and an output current maximum of 500mA is selected to generate the 3.3V power supply required by the matching circuit of the processor 4 and the antenna from the input 5V power supply. The input power supply 5V can be a power supply module from the control mainboard of the vehicle, and the SOC_GPIO1 is a control enable signal of the PU1 power supply by the SOC. Capacitors PC1, PC2 and PC3 can also be arranged at the input end of the input power supply and the final output end to play a filtering role, so as to perform power supply filtering on the input power supply or the output power supply. Resistors PR1 and PR2 are also arranged at the OUT (PIN1) pin of the PU1 output power supply to play a voltage dividing role. The resistor PR1 is a 100KΩ resistor, and the resistor PR2 is a 20KΩ resistor, so that the final output voltage Vout is: Vout=VIN*(PR1+PR2) / PR2=0.55*(100+20) / 20=3.3V, wherein PR1 is the resistance value of the resistor PR1, and PR2 is the resistance value of the resistor PR2. The finally generated 3V3_M21 is used as the power supply of the GNSS module M21A, as shown in Figure 2 , connected to the power supply pins PIN33 and PIN34 of the M21A, and also used as the power supply of the external antenna. The power supply path is 3V3_M21→magnetic bead TF0→first resistor R1→conducting power supply switch Q0→diode TD1→first inductor L1→second inductor L2→connector J1.

[0076] Specifically, the filter structure composed of the combination of the capacitance and the inductance can be further added to realize further filtering of the power supply voltage output by the power supply circuit 1 to the antenna, so as to further improve the accuracy and reliability of the power supply received by the antenna, the circuit structure is simple and easy to realize, the cost of the components used is low, the volume is small, and the whole power supply circuit 1 and the supporting circuit are simple to realize.

[0077] As an optional embodiment, the detection circuit 3 comprises:

[0078] The third resistor R3 has a first end connected with the second end of the magnetic bead TF0, the first end of the first resistor R1 and the power supply respectively;

[0079] The fourth resistor R4 has a first end connected with the ground;

[0080] The fifth resistor R5 has a first end connected with the second end of the third resistor R3 and the second end of the fourth resistor R4 respectively;

[0081] The sixth resistor R6 has a first end connected with the second end of the first resistor R1 and the first end of the power supply switch Q0 respectively;

[0082] The comparator TU1 has a first input end connected with the second end of the fifth resistor R5, a second input end connected with the second end of the sixth resistor R6, an output end connected with the detection end of the processor 4, a power supply end connected with a preset power supply and a ground end connected with the ground.

[0083] It is not difficult to understand that the function of the antenna detection circuit is to detect whether the antenna is normally installed. The pin 4 (ANT_DETECT) of the M21A is a detection pin. On the basis of the first resistor R1 provided in the power supply circuit 1, considering that whether the antenna is installed or not will directly affect the voltage at the second end of the first resistor R1, the first resistor R1 can be directly used as a sampling resistor of the detection circuit 3 at this time, and the voltage across the first resistor R1 is detected by the comparator TU1 to determine whether the antenna is normally installed. The fifth resistor R5 and the sixth resistor R6 are provided at the input end to limit the current, and the third resistor R3 and the fourth resistor R4 are provided at the first input end (IN+) to play a role of voltage division, which cooperates with the comparator TU1 to realize installation detection. The specific types, implementation manners and parameter values of the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the comparator TU1 are not particularly limited in the present application, and can be selected according to the parameters of the M21A. Figure 2

[0084] ​As a specific embodiment, the output structure of the comparator TU1 is an open-drain output, and the high and low levels of the output can directly indicate the installation status of the antenna. After the processor 4 chip is powered on, the ANT_OFF (PIN5) pin of M21A is configured to a low level by default. At this time, the collector and emitter of the power switch Q0 are conductive. Figure 2 As shown, the resistance of the first resistor R1 is 3.3Ω, the resistance of the second resistor R2 is 100KΩ, the resistance of the third resistor R3 is 1KΩ, and the resistance of the fourth resistor R4 is 110KΩ. When the antenna is not installed properly, the antenna cannot normally receive the power supply voltage output by the power supply circuit 1. The path in the power supply circuit 1 is: 3V3→ferrite bead TF0→first resistor R1→power switch Q0 turned on→second resistor R2 turned on to form a loop. At this time, the voltage V1 on both sides of the first resistor R1 is the voltage after voltage division with the second resistor R2, V1=3.3V / (R1+R2)*R1=0.0001V, and the voltage V IN- =3.3-0.0001=3.2999V, and the voltage of the positive input terminal (IN+) of the comparator TU1 is the voltage divided by the third resistor R3 and the fourth resistor R4 on the connected 3.3V power supply, and the positive input terminal voltage V is calculated. IN+ =3.3V / (1+110)*110=3.270V, V IN- Greater than V IN+ , so the output of comparator TU1 is low level. When the antenna is installed normally, the antenna current is generally greater than 30mA, so the voltage drop V2 across the first resistor R1 is greater than 3.3V*30mA=0.099V. At this time, the inverting input voltage V IN- =3.3-0.099=3.201V, which is less than its positive input voltage V IN+ =3.270V, so the output of comparator TU1 is high. R1 is the resistance of the first resistor R1, and R2 is the resistance of the second resistor R2. Therefore, the detection logic of processor 4 is: if ANT_DETECT (PIN4) is high, the antenna is properly installed; if ANT_DETECT (PIN4) is low, the antenna is not installed. To ensure that processor 4 can stably receive the level signal output by comparator TU1 in detection circuit 3, a resistor TR2 can be added between the output of comparator TU1 and the detection terminal of processor 4 to serve as an impedance matching resistor. This ensures stable signal transmission within the system and avoids signal distortion and performance degradation.

[0085] Specifically, the detection circuit 3 can directly detect whether the antenna is normally installed by sampling the voltage across the first resistor R1 and comparing it with the voltage after the third resistor R3 and the fourth resistor R4 are divided, and the detection of the antenna is realized by the power supply process of the power supply circuit 1. The entire circuit structure is simple and easy to implement, the cost of the components used is low, and the volume is small, which is conducive to the simple implementation of the entire power supply circuit 1 and the supporting circuit.

[0086] As an optional embodiment, the detection circuit 3 further comprises:

[0087] The pull-up resistor TR1 has a first end connected to the power supply and a second end connected to the output of the comparator TU1 and the detection end of the processor 4;

[0088] And / or,

[0089] The third capacitor C3 has a first end connected to the power supply and the power supply end of the comparator TU1 and a second end grounded.

[0090] It can be understood that the output pin (PIN1) of the comparator TU1 is connected to the detection end (PIN4) of the M21A, the output end of the comparator TU1 is provided with the pull-up resistor TR1, the output end thereof is connected to the 3V3 power supply through the pull-up resistor TR1, and the third capacitor C3 grounded at the power supply end of the comparator TU1 can also be provided to play a filtering role, thereby ensuring the accuracy and reliability of the power supply received by the comparator TU1. The specific type, implementation manner and parameter value of the pull-up resistor TR1 and the third capacitor C3 are not particularly limited in the present application, and can be selected according to the parameters of the Figure 2 .

[0091] Specifically, the stability and reliability of the final output signal of the comparator TU1 can be further improved by increasing the pull-up resistor TR1 and / or the third capacitor C3, the circuit structure is simple and easy to implement, the cost of the components used is low, and the volume is small, which is conducive to the simple implementation of the entire power supply circuit 1 and the supporting circuit.

[0092] As an optional embodiment, the signal processing circuit 2 comprises:

[0093] The first filter capacitor C11 has a first end grounded;

[0094] The filter resistor R11 has a first end connected to the second end of the first filter capacitor C11 and the antenna;

[0095] The second filter capacitor C12 has a first end grounded and a second end connected to the second end of the filter resistor R11 and the signal receiving end of the processor 4.

[0096] It is not difficult to understand that the processor 4 will receive the antenna signal received by the antenna through the signal processing circuit 2 to realize subsequent satellite positioning and attitude information collection functions, so the signal processing circuit 2 needs to realize the processing of the antenna signal. The signal processing circuit 2 specifically includes a first filter capacitor C11, a filter resistor R11 and a second filter capacitor C12, which form a π-type filter circuit and can effectively filter out signal noise. At the same time, considering that the antenna signal is an alternating current signal, a series capacitor C13 can also be added in the signal processing circuit 2. The capacitor C13 can pass alternating current and block direct current, avoiding the interference of direct current signals. At the same time, a grounded TVS tube TD2 can also be provided to filter out pulse signals. As shown in Figure 2 The transmission path of the antenna signal GNSS ANT is connector J1→ capacitor C13→ filter resistor R11→ RF IN (PIN2) of processor 4. After processing the received signal, M21A interacts with SOC through UART1 / UART2 bus. The specific type, implementation method and parameter value of the filter capacitor, filter resistor R11, second filter capacitor C12 and other components in the signal processing circuit 2 are not particularly limited in this application, and can be selected according to the parameters of the Figure 2 .

[0097] Specifically, by setting filter structure and TVS tube and other devices in the signal processing circuit 2, multi-filtration of the antenna signal is realized, thereby improving the accuracy and reliability of the antenna signal finally output to the processor 4, and ensuring the accurate implementation of the final GNSS module function. The circuit structure is simple and easy to implement, the components used are low in cost and small in size, which is conducive to the simple implementation of the entire power supply circuit 1 and the supporting circuit.

[0098] As an optional embodiment, it also includes:

[0099] A short-circuit protection circuit, the input end is connected with the antenna, and the output end is connected with the protection end of the processor 4, which is used to trigger the processor 4 to control the power supply circuit 1 to shut down when the antenna is short-circuited.

[0100] It can be understood that in order to ensure the normal work of the antenna, short-circuit detection and short-circuit protection of the antenna are also needed. When the antenna is abnormally short-circuited, the power supply process of the antenna needs to be stopped by cooperating with the processor 4 to control the power supply circuit 1, so as to avoid the influence of short-circuit current on the antenna and the entire supporting circuit when the antenna is short-circuited. The specific type and implementation method of the short-circuit protection circuit are not particularly limited in this application.

[0101] Specifically, by increasing the short-circuit protection circuit, the damage of the antenna and the components in the supporting circuit caused by the short-circuit current can be effectively avoided, and the safety and reliability of the entire supporting circuit and the GNSS module are improved.

[0102] As an optional embodiment, the short circuit protection circuit comprises:

[0103] an AND gate TU2, the first input end and the second input end are connected to each other, the output end is connected to the protection end of the processor 4, and the ground end is grounded;

[0104] a seventh resistor R7, the first end is connected to the output end of the power supply circuit 1 and the antenna respectively, and the second end is connected to the common connection point of the first input end and the second input end of the AND gate TU2;

[0105] a fourth capacitor C4, the first end is connected to the power supply and the power supply end of the AND gate TU2 respectively, and the second end is grounded.

[0106] It is not difficult to understand that the short circuit of the antenna will directly reflect at the connection position of the power supply circuit 1 and the antenna. When the antenna is short-circuited, the output end of the power supply circuit 1 will be pulled down, thereby causing the change of the output end voltage of the power supply circuit 1. Thus, the short circuit detection of the antenna can be realized, and since the direct manifestation of the short circuit is the pull-down of the voltage, the AND gate TU2 can be used to perform the level conversion on the abnormally pulled-down voltage in the power supply circuit 1, and output the level signal to the protection end of the processor 4, so that the processor 4 can identify and perform corresponding control. The fourth capacitor C4 can be arranged between the power supply end of the AND gate TU2 and the power supply, which plays a filtering role and ensures the accuracy and reliability of the power supply received by the AND gate TU2. The seventh resistor R7 is connected in series with the input end of the AND gate TU2, which plays a role of current limiting and protects the AND gate TU2. The specific types, implementation manners and parameter values of the AND gate TU2, the seventh resistor R7 and the fourth capacitor C4 are not particularly limited in the present application, and can be selected according to the parameters of the AND gate TU2, the seventh resistor R7 and the fourth capacitor C4 in the patent application. Figure 2 In order to ensure that the processor 4 can stably receive the level signal output by the AND gate TU2, a resistor TR3 can also be arranged between the output end of the AND gate TU2 and the protection end of the processor 4 as an impedance matching resistor, which ensures the stable transmission of the signal in the system and avoids signal distortion and performance degradation.

[0107] As a specific embodiment, the input end of the AND gate TU2 can be connected to the second end of the power supply switch Q0, that is, the C pole of the triode, to detect the short circuit of the antenna. When the antenna is normal, the C pole of the power supply switch Q0 is high, both input ends of the AND gate TU2 are high, and the AND gate TU2 outputs a high level signal. When the antenna is short-circuited, the C pole of the power supply switch Q0 is pulled low, both input ends of the AND gate TU2 are low, and the AND gate TU2 outputs a low level signal. The AND gate TU2 mainly plays a role of level conversion, and since the input level amplitude is less than 3.3V, the output signal high level amplitude reaches 3.3V. Therefore, the detection logic of the processor 4 is that the ANT_SHORT_N (PIN6) pin is high, and the antenna is not short-circuited, and the ANT_SHORT_N (PIN6) pin is low, and the antenna is short-circuited. After the ANT_SHORT_N (PIN6) pin is low, M21A pulls down the level of the ANT_OFF (PIN5) pin, controls the power supply switch Q0 to be turned off, and protects the front stage circuit of the power supply switch Q0 from being damaged.

[0108] Specifically, the voltage of the second end of the power supply switch Q0 is converted into a level signal by the AND gate TU2 and output to the processor 4, so that the processor 4 can detect the short circuit of the antenna in real time, and intervene in the operation of the power supply circuit 1 in time in the short circuit condition, protect the antenna and the entire supporting circuit, and avoid the safety problem caused by the short circuit current. The circuit structure is simple, easy to realize, the cost of the adopted components is low, the volume is small, and it is beneficial to the simple realization of the entire power supply circuit 1 and the supporting circuit.

[0109] To solve the above technical problems, the utility model provides a satellite navigation positioning module, including antenna and like preceding antenna's supporting circuit, antenna's supporting circuit is connected with antenna.

[0110] For the satellite navigation positioning module provided by the utility model, please refer to the above-mentioned embodiment of the antenna's supporting circuit, and the utility model will not be repeated here.

[0111] To solve the above technical problems, the utility model provides a vehicle, including like preceding satellite navigation positioning module.

[0112] For the vehicle provided by the utility model, please refer to the above-mentioned embodiment of the antenna's supporting circuit, and the utility model will not be repeated here.

[0113] Various embodiments are presented in the specification and claims below. Each embodiment can represent a distinct application of the present application. The applicant expects to be able to amend the claims to expressly recite one or more of the specific embodiments shown herein. The application may, however, also include any other applications shown in the specification or otherwise envisioned by the applicant, which are within the four corners of the claims submitted with the present application. The embodiments described herein are presented by way of example to enable one of ordinary skill in the art to practice the application. The applicant is not to be limited to or by these examples. Other embodiments can include a combination of features from different examples. The scope of the application is limited only by the claims submitted with the present application.

[0114] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to those skilled in the art, and all such modifications are within the scope of the present application as defined by the appended claims. The particular embodiments disclosed above are shown by way of example, and numerous other embodiments will become apparent to those skilled in the art, from the disclosure herein, without departing from the scope of the application. The scope of the application is limited only by the claims submitted with the present application.

Claims

1. A matching circuit for an antenna, characterized by The application relates to an antenna power supply circuit. The antenna power supply circuit comprises: a power supply circuit, an input end of which is connected with a power supply, and an output end of which is connected with an antenna, for supplying power to the antenna by using the power supply; a signal processing circuit, an input end of which is connected with the antenna, for filtering and processing an antenna signal output by the antenna; a detection circuit, an input end of which is connected with the power supply circuit, for detecting whether the antenna is normally installed according to a voltage in the power supply circuit; 2. A matching circuit for an antenna as claimed in claim 1, characterized in that a processor, a signal receiving end of which is connected with an output end of the signal processing circuit, for obtaining the antenna signal through the signal receiving end; a power supply control end of which is connected with a control end of the power supply circuit, for controlling the power supply circuit to be turned on through the power supply control end; and a detection end of which is connected with an output end of the detection circuit, for determining whether the antenna is normally installed through the detection end. The power supply circuit comprises: a magnetic bead, an input end of which is connected with a power supply, for filtering high-frequency noise in the power supply; a first resistor, a first end of which is connected with an output end of the magnetic bead; a power supply switch, a first end of which is connected with a second end of the first resistor, and a control end of which is connected with the power supply control end of the processor, for being turned on based on the control of the processor when the antenna needs to work; a second resistor, a first end of which is grounded; 3. A matching circuit for an antenna as claimed in claim 2, characterized in that a first capacitor, a first end of which is grounded, and a second end of which is connected with a second end of the power supply switch, a second end of the second resistor and the antenna respectively. The power supply circuit further comprises: a first inductor, a first end of which is connected with the second end of the power supply switch, the second end of the second resistor and the second end of the first capacitor respectively; a second capacitor, a first end of which is grounded; 4. The antenna companion circuit of claim 2, wherein, a second inductor, a first end of which is connected with the second end of the first inductor and the second end of the second capacitor respectively, and a second end of which is connected with the antenna. The detection circuit comprises: a third resistor, a first end of which is connected with a second end of the magnetic bead, a first end of the first resistor and the power supply respectively; a fourth resistor, a first end of which is grounded; a fifth resistor, a first end of which is connected with a second end of the third resistor and a second end of the fourth resistor respectively; a sixth resistor, a first end of which is connected with a second end of the first resistor and a first end of the power supply switch respectively; 5. A matching circuit for an antenna as claimed in claim 4, characterized in that a comparator, a first input end of which is connected with a second end of the fifth resistor, a second input end of which is connected with a second end of the sixth resistor, an output end of which is connected with the detection end of the processor, a power supply end of which is connected with a preset power supply, and a grounding end of which is grounded. The detection circuit further comprises: a pull-up resistor, a first end of which is connected with the power supply, and a second end of which is connected with the output end of the comparator and the detection end of the processor respectively; and / or, 6. The antenna companion circuit of claim 1, wherein, a third capacitor, a first end of which is connected with the power supply and the power supply end of the comparator respectively, and a second end of which is grounded. The signal processing circuit comprises: a first filter capacitor, a first end of which is grounded; a filter resistor, a first end of which is connected with a second end of the first filter capacitor and the antenna respectively; 7. A matching circuit for an antenna as claimed in any one of claims 1 to 6, characterized in that a second filter capacitor, a first end of which is grounded, and a second end of which is connected with a second end of the filter resistor and the signal receiving end of the processor respectively. Further, the antenna power supply circuit further comprises: a short-circuit protection circuit, an input end of which is connected with the antenna, and an output end of which is connected with a protection end of the processor, for triggering the processor to control the power supply circuit to be turned off when the antenna is short-circuited.

8. A matching circuit for an antenna as claimed in claim 7, characterized in that The short circuit protection circuit comprises: an AND gate, first and second input terminals being connected to each other, an output terminal being connected to a protection terminal of the processor, and a ground terminal being grounded; a seventh resistor, a first terminal of which is connected to the antenna and an output terminal of the power supply circuit respectively, and a second terminal of which is connected to a common connection point of the first and second input terminals of the AND gate; a fourth capacitor, a first terminal of which is connected to a power supply and a power supply terminal of the AND gate respectively, and a second terminal of which is grounded.

9. A satellite navigation positioning module, characterized in that The antenna is connected to a matching circuit of the antenna, and the matching circuit comprises the short circuit protection circuit.

10. A vehicle characterized by comprising: The satellite navigation positioning module comprises the short circuit protection circuit.

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