Portable Beidou personnel positioning terminal system for engineering construction environment

Abstract

The utility model discloses a portable Beidou personnel positioning terminal system oriented to an engineering construction environment, which comprises an S5pv210 microprocessor, an audio module adopts a WM8960 CODEC chip, and the WM8960 CODEC chip is connected with the S5pv210 microprocessor through a digital audio IIS interface; the Beidou positioning module adopts a BD / GPS (Big Dipper / Global Positioning System) module, and the BD / GPS module is connected with the S5pv210 microprocessor through a serial port; an SIM900A chip is adopted by the GPRS module, and the SIM900A chip is connected with the S5pv210 microprocessor; the technical problems that the receiving and positioning accuracy of Beidou signals can be influenced in a complex environment, so that the positioning precision is reduced, the cruising ability of a portable terminal is possibly limited, and the requirement for long-time use or continuous operation in an emergency situation cannot be met are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of Beidou positioning, and in particular relates to a portable Beidou personnel positioning terminal system for an engineering construction environment. Background Art

[0002] Construction workers need to locate personnel and collect application data in various scenarios such as smart construction sites and overseas projects. However, due to the limitations of portable terminals, the antenna and positioning technology of the current portable Beidou personnel positioning terminal system may not meet the high-precision requirements, especially in complex environments, which will affect the reception and positioning accuracy of Beidou signals, thereby reducing positioning accuracy. In addition, since portable terminals usually need to carry mobile power or battery power, their battery life may be limited and cannot meet the needs of continuous operation for long-term use or in emergency situations. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a portable Beidou personnel positioning terminal system for engineering construction environments, so as to solve the technical problems that the reception and positioning accuracy of Beidou signals will be affected in complex environments, thereby resulting in a decrease in positioning accuracy, and the portable terminal may have limited battery life and cannot meet the continuous operation requirements for long-term use or in emergency situations.

[0004] The technical solution of the utility model is:

[0005] A portable Beidou personnel positioning terminal system for engineering construction environments comprises an S5pv210 microprocessor, an audio module adopts a WM8960 CODEC chip, and the WM8960 CODEC chip is connected to the S5pv210 microprocessor through a digital audio IIS interface; a Beidou positioning module adopts a BD / GPS module, and the BD / GPS module is connected to the S5pv210 microprocessor through a serial port; a GPRS module adopts a SIM900A chip, and the SIM900A chip is connected to the S5pv210 microprocessor.

[0006] The WM8960 CODEC chip and the S5pv210 microprocessor are also connected via an I2C interface.

[0007] The BD / GPS module uses the UM220-III N chip; a 510 ohm resistor is connected in series between the UM220-III N chip and the S5pv210 microprocessor.

[0008] The antenna pin of the UM220-III N chip is connected to the antenna base through a 50-ohm impedance matching; the UM220-III N chip is connected to the clock power supply: the clock power supply of the UM220-III N chip is directly powered by a button battery.

[0009] The system also includes an SD card module, which uses a 6-pin SIM card slot and SMF05C as an electrostatic protection device; a 22R resistor is cascaded on the IO port line to match the impedance between the module and the SIM card.

[0010] The SIM900A chip is powered by a MIC29302WT linear regulator.

[0011] The system also includes a power supply module, and the power supply module uses an ACT8897 chip as a power management chip.

[0012] Beneficial effects of the utility model:

[0013] The portable Beidou personnel positioning terminal system of this utility model adopts BD / GPS module, so that the positioning accuracy meets the requirements of staff navigation and meets the positioning accuracy of staff. The GPRS module is used for classmates, and the stability of large-scale data communication is very good, which can realize the real-time data exchange between the control center and the navigation terminal, thus overcoming the deficiency that the traditional navigation system cannot realize real-time data communication with the control center; the power module part has the characteristics of low power consumption, which greatly improves the endurance function of the terminal system.

[0014] It solves technical problems such as the reception and positioning accuracy of Beidou signals will be affected in complex environments, resulting in reduced positioning accuracy, and the battery life of portable terminals may be limited and cannot meet the needs of continuous operation for long-term use or in emergency situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the connection between the S5pv210 processor and the CODEC chip of the utility model;

[0017] Figure 3 This is a schematic diagram of the composition of BD / GPS of the utility model;

[0018] Figure 4 This is the schematic diagram of the MIC29302WT linear regulator of the utility model;

[0019] Figure 5 This is a schematic diagram of the SD card module of the utility model. DETAILED DESCRIPTION

[0020] A portable Beidou personnel positioning terminal system for engineering construction environments, including:

[0021] Power supply module:

[0022] The voltage values ​​are 1.1 V and 1.2 V for the core, 1.8 V for the memory, 2.6 V, 3.0 V, 3.3 V for the peripherals, and 5v for USB. Not only should we consider the various voltage and current values ​​during normal operation, but also the minimum current during standby and the low power consumption when the power is turned off, and even the power timing of power on and off and power standby. Of course, we should also simplify the power supply to the maximum extent and reduce the cost. Therefore, after completing the design of the processor interface and external devices, optimize the power supply and select the best power supply solution. The design of the power supply part uses the high-efficiency, low-power, and high-reliability ACT8897 chip as the main power management chip.

[0023] Audio Module:

[0024] The audio module uses the WM8960 CODEC chip, which is connected to the S5pv210 microprocessor.

[0025] The S5pv210 microprocessor expands the CODEC chip with an interface through the integrated digital audio IIS interface to achieve the transmission of digital audio data. The S5pv210 microprocessor can also configure and monitor the functions of the CODEC chip through the I2C interface. The connection structure diagram of the S5pv210 microprocessor and the CODEC chip is shown in the figure. Figure 2 As shown, the S5pv210 microprocessor expands the CODEC chip through the integrated digital audio IIS interface to achieve the transmission of digital audio data. At the same time, the S5pv210 microprocessor also configures and monitors the functions of the CODEC chip through the I2C interface. In the design, WM8960 is used as a low-power, high-quality stereo codec (CODEC). WM8960 supports the most common clocks through direct input or built-in PLL. The connection structure between the S5pv210 microprocessor and the WM8960 CODEC chip is as follows:

[0026] Xi2sSCLK0 is the serial clock signal.

[0027] Xi2sSDI0 is the serial data input signal.

[0028] Xi2sSDO0 is the serial data output signal.

[0029] Xi2sLRCLK0 is the audio channel selection signal.

[0030] Xi2sCDCLK is the codec system clock signal, these signals are transmitted through the IIS bus interface.

[0031] Xi2cSDA0 and Xi2cSCL0 are the data and clock signals of the I2C interface, respectively, for communication between the processor and the CODEC chip. This design allows the S5pv210 processor to effectively interact and control audio data with the CODEC chip.

[0032] Beidou positioning module:

[0033] Positioning system positioning is an important part of Beidou personnel positioning terminal. The utility model is based on China's Beidou positioning system satellite positioning system, adopts BD / GPS module as Beidou positioning module, BD / GPS module adopts the third generation Beidou UM220-III N dual system chip, and supports BD2 B1 and GPS L1 two frequency points at the same time; BD / GPS module is connected with S5pv210 microprocessor.

[0034] The UM220-III N power supply circuit needs to be designed separately for module power supply. The DC voltage range of UM220-III N is 2.7~3.3 V, and the power consumption is 120mw. LM317 is used as the voltage regulator chip of the power module. The power output voltage is 3.3 V.

[0035] The UM220-III N chip communicates with the S5pv210 microprocessor via a serial port. A serial port module is required to achieve this communication. The connection between the UM220-III N and the S5pv210 microprocessor requires a 510 ohm resistor in series to limit the current. This ensures that the module can only be upgraded through the serial port, so it is necessary to ensure that the serial port can be interconnected with the PC. The UM220-III N chip needs to be connected to an external antenna base to receive satellite signals for positioning. The antenna pin RFIN is connected to the external antenna base through a 50 ohm impedance matching to ensure effective transmission of the signal. The UM220-III N chip is connected to the clock power supply module: The clock power supply module of the UM220-III N chip is directly powered by a button battery. This module provides the necessary clock signal for the chip to ensure its normal operation.

[0036] SD card module:

[0037] The design uses a 6-pin SIM card slot without SIM card detection function. The circuit uses SMF05C as an electrostatic protection device. The IO port line is cascaded with a 22R resistor to match the impedance between the module and the SIM card. The sim_data pin of the data signal has been pulled up inside the module. Note that the SIM card peripheral circuit of the device should be close to the SIM card slot. The 6-pin SIM card holder circuit wiring diagram is as follows Figure 5 shown.

[0038] GPRS module:

[0039] The data transmission between the Beidou personnel positioning terminal and the central server is carried out through wireless communication, so the terminal must have a GPRS module for wireless communication. The utility model uses the SIM900A chip produced by SIMCom as the GPRS module. The chip power supply voltage is 3.4 V ~ 4.5 V. The current consumption of the energy-saving mode SLEEP is 1.0 mA. SIM900A has powerful functions, but the utility model only uses the GPRS function.

[0040] SIM900A is powered by VBAT. In some cases, a burst signal can cause the voltage to drop and the current loss peak can reach 2A. Therefore, the power supply must be able to provide enough current to 2A.

[0041] The MIC29302WT linear regulator achieves 4V output voltage and 3A output current. The schematic diagram is as follows Figure 4 As shown, Input Power: The power supply circuit receives an input voltage from the power supply system, which is usually a voltage higher than 4V. MIC29302WT Linear Regulator: This is the core component of the power supply circuit and is used to reduce the input voltage to the required 4V output voltage. The MIC29302WT is a linear regulator that maintains a stable output voltage through internal adjustments, even if the input voltage or load current changes. Output Current Capability: The MIC29302WT is designed to be able to provide an output current of up to 3A. This is necessary to ensure that the SIM900A module can work stably even under high load conditions. Capacitors: Input and output capacitors are included in the power supply circuit to filter noise and provide a smooth power supply. Resistors: Resistors are included in the circuit to set the operating parameters of the regulator, such as output voltage or current limit. Connect to SIM900A: The output of the regulator will be connected to the SIM900A module to provide a stable 4V power supply.

[0042] The SIM900A main chip circuit design mainly includes the switch module design, RTC power supply design and network status indicator light design. The switch module uses the PWRKEY pin to boot the SIM900A module by pulling the PWRKEY signal low for a period of time and then releasing it. The pin inside the module has been pulled to 3V. The RTC module can be powered by a large or battery. There is a current limiting resistor inside the module, so only a button battery or a large capacitor can be used to directly connect the VRTC pin to provide power for the RTC. This design uses a button battery to directly power the RTC module. The NETLIGHT signal is used to drive the LED light for network status instructions.

[0043] The supply voltage of SIM900A is 4V, so a 1k resistor is required in the serial connection between the S5pv210 microprocessor and SIM900A. The SIM900A main chip includes a switch module, an RTC (real time clock) power module and a network status indicator.

[0044] Switch module: The SIM900A module uses the PWRKEY pin to control the switch. The SIM900A module can be started by pulling the PWRKEY signal low for a period of time and then releasing it. This pin has been pulled up to 3V inside the module.

[0045] RTC power module: The RTC module is powered by a large battery or a button battery. There is a current limiting resistor inside the module, so a single button battery or a large capacitor can be directly connected to the VRTC pin to provide power. In this utility model, a button battery is used to directly power the RTC module.

[0046] Network status indicator: Use the NETLIGHT signal to drive the LED light indicating the network status. The working status of the module is indicated by different flashing modes of the LED light, as follows:

[0047] SIM900A is not working: the LED is off.

[0048] SIM900A does not find the network: 64ms on / 800ms off.

[0049] SIM900A has been registered to the network: 64ms on / 3000ms off.

[0050] GPRS starts communication: 64ms on / 3000ms off.

Claims

1. A portable Beidou personnel positioning terminal system for engineering construction environments, characterized by: The system includes an S5pv210 microprocessor, an audio module adopts a WM8960 CODEC chip, and the WM8960 CODEC chip is connected to the S5pv210 microprocessor through a digital audio IIS interface; a Beidou positioning module adopts a BD / GPS module, and the BD / GPS module is connected to the S5pv210 microprocessor through a serial port; a GPRS module adopts a SIM900A chip, and the SIM900A chip is connected to the S5pv210 microprocessor.

2. According to claim 1, a portable Beidou personnel positioning terminal system for engineering construction environment is characterized by: The WM8960 CODEC chip and the S5pv210 microprocessor are also connected via an I2C interface.

3. The portable Beidou personnel positioning terminal system for engineering construction environment according to claim 1 is characterized in that: The BD / GPS module uses the UM220-III N chip; a 510 ohm resistor is connected in series between the UM220-III N chip and the S5pv210 microprocessor.

4. A portable Beidou personnel positioning terminal system for engineering construction environment according to claim 3, characterized in that: The antenna pin of the UM220-III N chip is connected to the antenna base through a 50-ohm impedance matching; the UM220-III N chip is connected to the clock power supply: the clock power supply of the UM220-III N chip is directly powered by a button battery.

5. The portable Beidou personnel positioning terminal system for engineering construction environment according to claim 1 is characterized by: The system also includes an SD card module, which uses a 6-pin SIM card slot and SMF05C as an electrostatic protection device; a 22R resistor is cascaded on the IO port line to match the impedance between the module and the SIM card.

6. The portable Beidou personnel positioning terminal system for engineering construction environment according to claim 1 is characterized by: The SIM900A chip is powered by a MIC29302WT linear regulator.

7. The portable Beidou personnel positioning terminal system for engineering construction environment according to claim 1 is characterized by: The system also includes a power supply module, and the power supply module uses an ACT8897 chip as a power management chip.

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