Combined navigation equipment

Abstract

The utility model relates to combined navigation equipment, belongs to the technical field of navigation, and solves the problems of high cost and high power consumption of a receiver for navigation in the prior art. The combined navigation equipment comprises a radio frequency chip, a baseband chip and a DSP (Digital Signal Processor) chip; the signal input end of the radio frequency chip is connected with a navigation antenna, and the signal output end of the radio frequency chip is connected with the signal input end of the baseband chip; the signal transmission end of the baseband chip is connected with the first UART interface of the DSP chip; a second UART (Universal Asynchronous Receiver / Transmitter) interface of the DSP chip is used as a first external interface of the combined navigation equipment and is connected with host equipment; and the radio frequency chip is connected to the DSP chip through an SPI (Serial Peripheral Interface) bus. The navigation equipment with low cost and low power consumption is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of navigation, in particular to a combined navigation device. Background Art

[0002] Navigation is to guide the navigation of a vehicle. Integrated navigation is a navigation system that combines two or more navigation devices on moving vehicles such as aircraft and ships.

[0003] As far as the Beidou satellite navigation industry is concerned, with the improvement of China's IC design level, there are now more than 10 domestic manufacturers that have the ability to design Beidou RF chips and baseband chips. However, there are no baseband chips and related miniaturized modules that can achieve high dynamic / high precision combined navigation.

[0004] Although it is possible to use a receiver built with general-purpose chips to achieve high dynamic capabilities, it is difficult to use such a receiver due to limitations in cost, power consumption, and other aspects.

[0005] Therefore, there is an urgent need for a navigation device with low cost and low power consumption. Utility Model Content

[0006] In view of the above analysis, the utility model aims to provide a combined navigation device to solve the problems of high cost and high power consumption of receivers used for navigation in the prior art.

[0007] The purpose of this utility model is mainly achieved through the following technical solutions:

[0008] The combined navigation device includes a radio frequency chip, a baseband chip and a DSP chip;

[0009] The signal input end of the radio frequency chip is connected to the navigation antenna, and the signal output end of the radio frequency chip is connected to the signal input end of the baseband chip;

[0010] The signal transmission end of the baseband chip is connected to the first UART interface of the DSP chip; the second UART interface of the DSP chip is used as the first external interface of the combined navigation device and is connected to the host device;

[0011] The radio frequency chip is connected to the DSP chip via an SPI bus.

[0012] Based on the further improvement of the above combined navigation device, the signal input end of the radio frequency chip includes two independent down-conversion channels, both connected to the navigation antenna, and each down-conversion channel is separately configured to receive the GNSS radio frequency signal from the navigation antenna;

[0013] The signal output end of the RF chip includes two pairs of differential analog intermediate frequency interfaces, and the two pairs of differential analog intermediate frequency interfaces are both connected to the baseband ADC sampling interface of the baseband chip, and output two GNSS intermediate frequency signals to the baseband chip respectively;

[0014] Wherein, the signal input end of the baseband chip includes the baseband ADC sampling interface.

[0015] Based on the further improvement of the above-mentioned combined navigation device, the radio frequency chip is Runxin CA1725.

[0016] Based on the further improvement of the above combined navigation device, the signal transmission end of the baseband chip includes a third UART interface and a fourth UART interface;

[0017] The third UART interface is connected to the first UART interface of the DSP chip, and is used to transmit the original observation value to the DSP chip;

[0018] The fourth UART interface serves as the second external interface of the combined navigation device and is used for debugging and program upgrading the baseband chip.

[0019] Based on the further improvement of the above combined navigation device, the baseband chip is Higer BP2015.

[0020] Based on the further improvement of the above combined navigation device, the DSP chip further includes a fifth UART interface, a first SPI interface and a second SPI interface; the radio frequency chip further includes a third SPI interface;

[0021] The fifth UART interface is used as the third external interface of the integrated navigation device to connect to an inertial component or a differential base station device;

[0022] The first SPI interface is connected to the third SPI interface of the radio frequency chip;

[0023] The second SPI interface serves as the fourth external interface of the integrated navigation device and is used to connect a serial external device.

[0024] Based on the further improvement of the above combined navigation device, the DSP chip is TMS320C6748.

[0025] Based on the further improvement of the above combined navigation device, the combined navigation device further comprises a first power chip and a second power chip, and the first power chip and the second power chip are connected to an external 3.3V power supply;

[0026] An external 3.3V power supply supplies power to the RF chip and the baseband chip at the same time, the first power chip supplies power to the baseband chip and the DSP chip at the same time, and the second power chip supplies power to the DSP chip.

[0027] Based on further improvement of the above combined navigation device, the first power chip is TPS62060, and the second power chip is TPS62236.

[0028] Based on further improvement of the above combined navigation device, the first external interface, the second external interface, the third external interface and the fourth external interface are all 80-pin stamp interfaces.

[0029] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0030] 1. By modularizing the RF chip, baseband chip and DSP chip as a whole, the cost and power consumption of the combined navigation device are low;

[0031] 2. The entire combined navigation device only requires a simple external power supply and communication interface, and is equipped with an antenna to realize the navigation function and meet the needs of secondary development.

[0032] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can be obvious from the description or understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0034] Figure 1 A schematic structural diagram of a combined navigation device provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0036] High dynamics: refers to the ability of navigation equipment to update position information in real time in high dynamic scenes. It is a key indicator for applications such as high dynamic navigation. Usually, we call motion scenes with speeds greater than 900m / s high dynamics.

[0037] High precision: refers to high positioning accuracy, reaching centimeter level or above in positioning plane and elevation, which is a key indicator for applications such as surveying and mapping.

[0038] Integrated navigation: Navigation is to guide the navigation of the vehicle. Integrated navigation is a navigation system that combines two or more navigation devices on moving vehicles such as aircraft and ships.

[0039] A specific embodiment of the utility model discloses a combined navigation device, such as Figure 1 As shown, the combined navigation device includes a radio frequency chip, a baseband chip and a DSP chip;

[0040] The signal input end of the radio frequency chip is connected to the navigation antenna, and the signal output end of the radio frequency chip is connected to the signal input end of the baseband chip;

[0041] The signal transmission end of the baseband chip is connected to the first UART interface of the DSP chip; the second UART interface of the DSP chip is used as the first external interface of the combined navigation device and is connected to the host device;

[0042] The radio frequency chip is connected to the DSP chip via an SPI bus.

[0043] Specifically, the navigation antenna is used to receive radio frequency signals and transmit them to the radio frequency chip, which performs frequency conversion on the radio frequency signals and transmits the processed intermediate frequency signals to the baseband chip. The baseband chip converts the intermediate frequency signals into digital signals for processing, and performs functions such as capturing, tracking, demodulating and decoding navigation messages, and extracting original observation quantities (pseudorange, Doppler, messages) on the intermediate frequency signals.

[0044] Specifically, the baseband chip communicates with the DSP chip through the signal transmission end, and the DSP chip communicates with an external host device through the second UART interface, and the host device may be a satellite.

[0045] Specifically, the radio frequency chip is connected to the DSP chip through the SPI bus for communication, and the DSP chip can configure the registers of the radio frequency chip.

[0046] Preferably, if Figure 1 As shown, the signal input end of the RF chip includes two independent down-conversion channels, both of which are connected to the navigation antenna, and each down-conversion channel is separately configured to receive the GNSS RF signal from the navigation antenna;

[0047] The signal output end of the RF chip includes two pairs of differential analog intermediate frequency interfaces, and the two pairs of differential analog intermediate frequency interfaces are both connected to the baseband ADC sampling interface of the baseband chip, and output two GNSS intermediate frequency signals to the baseband chip respectively;

[0048] Wherein, the signal input end of the baseband chip includes the baseband ADC sampling interface.

[0049] Specifically, Figure 1 As shown, the RF chip receives the GNSS RF signal received by the navigation antenna through two down-conversion channels. The two down-conversion channels can arbitrarily configure the frequency and bandwidth to receive the required GNSS RF signal; the RF chip transmits the GNSS IF signal to the baseband chip through two pairs of differential analog IF interfaces, and the baseband chip connects the two pairs of differential analog IF interfaces through the baseband ADC sampling interface.

[0050] Preferably, the RF chip uses Runxin CA1725.

[0051] Specifically, the RF_IN_C1 pin and RF_IN_C2 pin of Runxin CA1725 are used as two down-conversion channel interfaces for connecting the navigation antenna; the IF_P_C1 pin and IF_N_C1 pin of Runxin CA1725 are used as a pair of differential analog intermediate frequency interfaces, and the IF_P_C2 pin and IF_N_C2 pin of Runxin CA1725 are used as another pair of differential analog intermediate frequency interfaces to connect to the baseband chip; the VDD_IO pin of Runxin CA1725 is used to connect an external 3.3V power supply to power the RF chip; the SCLK pin, SDA pin and SS pin of Runxin CA1725 are connected to the DSP chip as an SPI interface.

[0052] Preferably, the signal transmission end of the baseband chip includes a third UART interface and a fourth UART interface;

[0053] The third UART interface is connected to the first UART interface of the DSP chip, and is used to transmit the original observation value to the DSP chip;

[0054] The fourth UART interface serves as the second external interface of the combined navigation device and is used for debugging and program upgrading the baseband chip.

[0055] Specifically, the baseband ADC sampling interface of the baseband chip receives the GNSS intermediate frequency signal from the RF chip, and the baseband chip performs functions such as capturing, tracking, demodulating and decoding the navigation message, and extracting the original observation quantity (pseudorange, Doppler, message) on the GNSS intermediate frequency signal.

[0056] Specifically, the baseband chip communicates with the DSP chip through the third UART interface, and is connected to the debugging and program upgrading device through the fourth UART interface to perform debugging and program upgrading for the baseband chip.

[0057] Preferably, the baseband chip adopts Higer BP2015.

[0058] Specifically, the F_B3_N pin, IF_B3_P pin, IF_L1_N pin and IF_L1_P pin of Haige BP2015 are used as the baseband ADC sampling interface of the baseband chip, among which the IF_B3_N pin and IF_B3_P pin are used to connect a pair of differential analog intermediate frequency interfaces of the RF chip, and the IF_L1_N pin and IF_L1_P pin of Haige BP2015 are used to connect another pair of differential analog intermediate frequency interfaces of the RF chip; the UART_CS0_RX pin of Haige BP2015 The UART_NM0_RX pin and UART_NM0_TX pin of Haier BP2015 serve as the third UART interface of the baseband chip, which are used to connect the DSP chip; the UART_NM0_RX pin and UART_NM0_TX pin of Haier BP2015 serve as the fourth UART interface of the baseband chip and serve as the second external interface of the combined navigation device, which are used for debugging and program upgrade interface; the VDD_3_3 pin of Haier BP2015 is used to connect the external 3.3V power supply, and the VDD_1_2 pin of Haier BP2015 is used to connect the first power supply chip.

[0059] Preferably, if Figure 1 As shown, the DSP chip also includes a fifth UART interface, a first SPI interface and a second SPI interface; the RF chip also includes a third SPI interface;

[0060] The fifth UART interface is used as the third external interface of the integrated navigation device to connect to an inertial component or a differential base station device;

[0061] The first SPI interface is connected to the third SPI interface of the radio frequency chip;

[0062] The second SPI interface serves as the fourth external interface of the integrated navigation device and is used to connect a serial external device.

[0063] Specifically, when the RF chip is Runxin CA1725, the third SPI interface is the SCLK pin, SDA pin and SS pin of Runxin CA1725, and the first SPI interface of the DSP chip is connected to the third SPI interface of the RF chip.

[0064] Specifically, Figure 1 As shown, the DSP chip communicates with the baseband chip through the first UART, communicates with the RF chip through the first SPI interface, communicates with the external serial external device through the second SPI interface, communicates with the external host device through the second UART interface, and communicates with the external inertial component or differential base station device through the fifth UART interface.

[0065] Preferably, the DSP chip is TMS320C6748.

[0066] Specifically, when the DSP chip is TMS320C6748, the SPI1_CLK pin, SPI1_SOMI pin and SPI1_SIMO pin of the TMS320C6748 are used as the first SPI interface, connected to the third SPI interface of the RF chip; the UART1_RXD pin and UART1_TXD pin of the TMS320C6748 are used as the first UART interface, connected to the third UART interface of the baseband chip; the UART2_RXD pin and UART2_TXD pin of the TMS320C6748 are used as the second UART interface, as the first external interface of the combined navigation device, connected to the host device; the UART0_RXD pin and UART0_TXD pin of the TMS320C6748 are used as the second UART interface, as the first external interface of the combined navigation device, connected to the host device; The D pin serves as the fifth UART interface and the third external interface of the combined navigation device, and is used to connect an inertial component or a differential base station device; the SPI1_CLK pin, SPI1_SOMI pin and SPI1_SIMO pin of the TMS320C6748 serve as the first SPI interface and are used to connect the third SPI interface of the RF chip; the SPI2_CLK pin, SPI2_SOMI pin and SPI2_SIMO pin of the TMS320C6748 serve as the second SPI interface and are used as the fourth external interface to connect a serial external device; the CVDD12 pin of the TMS320C6748 is used to connect the first power chip, and the CVDD18 pin of the TMS320C6748 is used to connect the second power chip.

[0067] Preferably, the combined navigation device further comprises a first power chip and a second power chip, wherein the first power chip and the second power chip are connected to an external 3.3V power supply;

[0068] An external 3.3V power supply supplies power to the RF chip and the baseband chip at the same time, the first power chip supplies power to the baseband chip and the DSP chip at the same time, and the second power chip supplies power to the DSP chip.

[0069] Specifically, the external 3.3V power supply supplies power to the entire combined navigation device. The first power chip converts 3.3V into 1.2V, and the second power chip converts 3.3V into 1.8V. When in use, the combined navigation device is powered according to the situation.

[0070] Preferably, the first power chip adopts TPS62060, and the second power chip adopts TPS62236.

[0071] Preferably, the first external interface, the second external interface, the third external interface and the fourth external interface are all 80-pin stamp interfaces.

[0072] Specifically, the combined navigation device includes a first external interface, a second external interface, a third external interface and a fourth external interface, all of which adopt an 80-pin stamp interface.

[0073] It is worth noting that each UART includes a two-wire combination of RX receiving and TX sending.

[0074] Compared with the prior art, the combined navigation device provided by the embodiment of the utility model modularizes the RF chip, baseband chip and DSP chip as a whole, so that the combined navigation device has low cost and low power consumption; at the same time, the entire combined navigation device only requires a simple power supply and communication interface to be provided externally, and is equipped with an antenna to realize the navigation function, thereby meeting the needs of secondary development.

[0075] Those skilled in the art can understand that the programs / software involved in the baseband chip in the above-mentioned embodiments are common methods in the prior art, such as running the existing navigation differential calculation method in the baseband chip, and the present invention does not involve any software improvements. The present invention only requires that each device with corresponding functions be connected through the connection relationship given in the embodiment of the present invention, which does not involve any program software improvements. As for the connection method between the hardware devices with corresponding functions, it can be implemented by those skilled in the art using the prior art, and will not be described in detail here.

[0076] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A combined navigation device, characterized in that: The combined navigation device includes a radio frequency chip, a baseband chip and a DSP chip; The signal input end of the radio frequency chip is connected to the navigation antenna, and the signal output end of the radio frequency chip is connected to the signal input end of the baseband chip; The signal transmission end of the baseband chip is connected to the first UART interface of the DSP chip; the second UART interface of the DSP chip is used as the first external interface of the combined navigation device and is connected to the host device; The radio frequency chip is connected to the DSP chip via an SPI bus.

2. The integrated navigation device according to claim 1, characterized in that: The signal input end of the RF chip includes two independent down-conversion channels, both connected to the navigation antenna, and each down-conversion channel is separately configured to receive the GNSS RF signal from the navigation antenna; The signal output end of the RF chip includes two pairs of differential analog intermediate frequency interfaces, and the two pairs of differential analog intermediate frequency interfaces are both connected to the baseband ADC sampling interface of the baseband chip, and output two GNSS intermediate frequency signals to the baseband chip respectively; Wherein, the signal input end of the baseband chip includes the baseband ADC sampling interface.

3. The integrated navigation device according to claim 2, characterized in that: The RF chip is Runxin CA1725.

4. The integrated navigation device according to claim 3, characterized in that: The signal transmission end of the baseband chip includes a third UART interface and a fourth UART interface; The third UART interface is connected to the first UART interface of the DSP chip, and is used to transmit the original observation value to the DSP chip; The fourth UART interface serves as the second external interface of the combined navigation device and is used for debugging and program upgrading the baseband chip.

5. The integrated navigation device according to claim 4, characterized in that: The baseband chip is Higer BP2015.

6. The integrated navigation device according to claim 4, characterized in that: The DSP chip also includes a fifth UART interface, a first SPI interface and a second SPI interface; the radio frequency chip also includes a third SPI interface; The fifth UART interface is used as the third external interface of the integrated navigation device to connect to an inertial component or a differential base station device; The first SPI interface is connected to the third SPI interface of the radio frequency chip; The second SPI interface serves as the fourth external interface of the integrated navigation device and is used to connect a serial external device.

7. The integrated navigation device according to claim 6, characterized in that: The DSP chip is TMS320C6748.

8. The integrated navigation device according to claim 1, characterized in that: The integrated navigation device further comprises a first power chip and a second power chip, wherein the first power chip and the second power chip are connected to an external 3.3V power supply; An external 3.3V power supply supplies power to the RF chip and the baseband chip at the same time, the first power chip supplies power to the baseband chip and the DSP chip at the same time, and the second power chip supplies power to the DSP chip.

9. The integrated navigation device according to claim 8, characterized in that: The first power chip is TPS62060, and the second power chip is TPS62236.

10. The integrated navigation device according to claim 6, characterized in that: The first external interface, the second external interface, the third external interface and the fourth external interface are all 80-pin stamp interfaces.

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