CN112612038A - Low-power consumption GPS positioning method and system - Google Patents
Low-power consumption GPS positioning method and system Download PDFInfo
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- CN112612038A CN112612038A CN202011618272.XA CN202011618272A CN112612038A CN 112612038 A CN112612038 A CN 112612038A CN 202011618272 A CN202011618272 A CN 202011618272A CN 112612038 A CN112612038 A CN 112612038A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/34—Power consumption
Abstract
The invention relates to a navigation positioning technology, and discloses a low-power consumption GPS positioning method, which comprises the following steps: a base station gateway acquires and broadcasts a real-time ephemeris; the positioning device receives the real-time ephemeris after being awakened, enters a hot start mode to acquire specific position information, uploads the specific position information to the base station gateway and then enters a sleep mode; the base station gateway receives the specific position information and further performs back-end processing; the system also comprises a low-power consumption GPS positioning system, which comprises a positioning device, a base station gateway and an A-GNSS server, wherein the base station gateway is in network interaction with the A-GNSS server; the positioning device and the base station gateway receive and transmit information through the wireless communication module. Compared with the GPS hot start mode, the invention only adds the part for receiving data, and removes the time for transmitting data request, network interaction and corresponding power consumption, so that the positioning device is always in an ultra-low power consumption state, and the service cycle and the service life of the battery are greatly prolonged.
Description
Technical Field
The invention relates to a navigation positioning technology, in particular to a low-power-consumption GPS positioning method and system.
Background
The existing GPS module cold start method of the positioning device is forcibly started in a hardware mode, at the moment, the GPS module clears all historical information, a GPS receiver loses satellite parameters, or the difference between the existing parameters and the actually received satellite parameters is too much, so that the positioning device cannot work, and coordinate data provided by satellites must be obtained again.
The warm start mode is the start of the GPS module when the last positioning time exceeds 2 hours or the Beidou satellite navigation module when the last positioning time exceeds 1 hour, and the satellite searching and positioning time is between cold start and hot start. The GPS module stores the position, the almanac and the UTC time of the satellite which are calculated finally, however, due to the fact that the shutdown time is too long, ephemeris changes, the stored content is not data of the current visible satellite, the previous satellite cannot receive the ephemeris, and position information needs to be searched and supplemented, therefore, the satellite searching time is longer than that of hot start and shorter than that of cold start, but the warm start mode also has the problem that power consumption is high.
In addition, the A-GNSS auxiliary function required by the GPS positioning scheme is a mode of injecting GPS/BDS ephemeris through a serial port, the first positioning time of the receiver can be improved, and especially under the scene that weak signal ephemeris is difficult to collect, the A-GNSS auxiliary function is more obvious in improvement of the first positioning time. Therefore, the positioning power consumption can be greatly reduced. However, the a-GNSS scheme requires a channel to interact with the a-GNSS server in real time, and generally connects to a 2G/3G/4G wireless network to acquire data of the satellite's position, almanac, and UTC time, which also increases power consumption and cost.
In summary, in combination with the two modes, the GPS-Only mode has high power consumption, especially in the cold start state and the warm start state; in the A-GNSS mode, the access terminal initiates a request to acquire data such as original ephemeris and the like through the wireless network and the A-GNSS server, a certain amount of interaction is needed in the period, and the power consumption is obviously reduced compared with the power consumption in the GPS-Only mode depending on the specific network environment and conditions, but considerable power consumption is still consumed in network interaction.
Disclosure of Invention
The invention provides a low-power consumption GPS positioning method and system aiming at the defect of high power consumption in the prior art, wherein a base station gateway acquires a real-time ephemeris, the real-time ephemeris is broadcast and covered circularly and continuously, a positioning device receives the real-time ephemeris after being awakened, and a GPS module enters a hot start mode to acquire specific position information, so that the power consumption is greatly reduced.
In order to solve the technical problem, the invention is solved by the following technical scheme:
the low-power consumption GPS positioning method comprises the following steps:
s1: a GPS module of a base station gateway acquires local position information and local time information in real time;
s2: the base station gateway and the A-GNSS server interact to obtain a real-time ephemeris;
s3: the base station gateway broadcasts and covers the acquired real-time ephemeris, local position information and local time information in real time;
s4: the method comprises the steps that after being awakened, a positioning device receives real-time ephemeris, local position information and local time information broadcast by a base station gateway, and injects the real-time ephemeris, the local position information and the local time information into a GPS module of the positioning device, the GPS module enters a hot start mode, and the GPS module acquires specific position information of the positioning device;
s5: the positioning device uploads specific position information to the base station gateway, and then the positioning device enters a sleep mode to wait for being awakened next time;
s6: and the base station gateway receives the specific position information transmitted by the positioning device and further performs back-end processing.
Further, in step S3, the base station gateway broadcasts the acquired real-time ephemeris in real-time by using an FSK modulation method. Because the corresponding information is broadcasted in real time, the data volume of the information needing to be transmitted is large, and the FSK modulation mode can ensure the accurate transmission of the information.
Further, the broadcast rate of the base station gateway can reach 300 Kbit.
Further, in step S4, the positioning apparatus receives the real-time ephemeris broadcast by the base station gateway through the FSK receiver.
Further, in step S5, the positioning apparatus uploads the specific location information to the base station gateway through the LORA transmitter.
Further, in step S6, the base station gateway receives the specific location information transmitted by the positioning apparatus by using the LORA modulation method. Due to the characteristics of small data quantity of transmitted specific position information, long transmission distance and the like, the LORA modulation mode can ensure accurate and error-free transmission of information.
Further, the broadcast frequency point of the base station gateway in step S3 is spaced by 30Mhz from the receive frequency point of the base station gateway in step S6. The receiving and sending pilot frequency is separated by 30Mhz, so that the influence on a receiver can be reduced, and the influence of a base station gateway broadcast channel on the uplink of the positioning device can be effectively avoided. The invention also provides a low-power consumption GPS positioning system, which comprises a positioning device, a base station gateway and an A-GNSS server, wherein the positioning device comprises an MCU, a GPS module, a wireless communication module and a battery; the MCU is connected with the GPS module through a circuit and is powered by a battery; the base station gateway comprises an MCU, a GPS module, a wireless communication module, a wireless network module and a power supply, wherein the MCU is connected with the GPS module through a circuit and is powered by the power supply;
the base station gateway interacts with an A-GNSS server network through a wireless network module to acquire real-time ephemeris information;
the positioning device and the base station gateway receive and send information through the wireless communication module, the base station gateway broadcasts the obtained real-time ephemeris continuously, the positioning device is awakened to receive the real-time ephemeris, the hot start mode is entered, specific position information is obtained, and the specific position information is sent to the base station gateway for back-end processing.
Furthermore, the wireless communication module of the positioning device comprises an FSK receiver for receiving the real-time ephemeris broadcast by the base station gateway; the wireless communication module of the positioning device also comprises a LORA transmitter which uploads the specific position information of the positioning device to the base station gateway.
Further, a wireless communication module of the base station gateway comprises an FSK transmitter for broadcasting and covering the acquired real-time ephemeris in real time; the wireless communication module of the base station gateway also comprises a LORA receiver for receiving the specific position information transmitted by the positioning device.
Furthermore, the wireless network module is a 3G/4G/5G wireless network.
Due to the adoption of the technical scheme, the invention has the remarkable technical effects that:
the invention optimizes the calling of AGNSS data request initiated by a positioning device (access terminal), the establishment of link, the return receiving of data and the like, local real-time ephemeris and other data are directly received and used through a base station node (public channel) (not acquired by the positioning device through interacting with an A-GNSS server network), the positioning device can receive the real-time ephemeris after being awakened, and then the positioning device enters a hot start mode instead of a cold start or warm start mode.
Partial estimation is carried out on power consumption, the frequency of updating ephemeris is about 2 hours, the duration of a cold start mode is about 30S without real-time ephemeris, the power consumption is about (20mA × 3V × 30S), and the duration of the cold start mode even reaches the level of minutes under the signal difference condition; the positioning device of the invention is under the condition of real-time ephemeris, namely the positioning device can obtain the real-time ephemeris sent by the base station gateway, and belongs to a hot start mode, the time length of the hot start mode is about (1-6) S, the power consumption of the hot start mode is about (20mA x 3V x 1S-20mA x 3V x 6S), the electric energy is saved, and the service life of a battery of the positioning device in the prior art can be greatly prolonged by more than 5 times.
Drawings
FIG. 1 is a schematic flow chart of a GPS positioning method according to the present invention;
FIG. 2 is a block diagram of a GPS positioning system according to the present invention.
Detailed Description
Embodiments of the present application will be described in detail with reference to the drawings and examples, so that how to implement technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.
Examples
As shown in fig. 1, the low power consumption GPS positioning method includes the following steps:
s1: a GPS module of a base station gateway acquires local position information and local time information in real time;
s2: the base station gateway interacts with an A-GNSS server at regular time through a wireless network module to obtain a real-time ephemeris; the size of the acquired real-time ephemeris information is about 6.3KB, the real-time ephemeris information comprises a GPS module and BD ephemeris data, and the base station gateway interacts with the AGPS server every 1-2 hours.
S3: a wireless communication module of the base station gateway broadcasts and covers the acquired real-time ephemeris and local position information and local time information in real time by adopting an FSK modulation mode; because the transmission data volume is large, an FSK modulation mode is adopted, and the rate can reach 300 Kbit; it is sent in broadcast form, with uninterrupted polling. The broadcast coverage area can be up to 10 km.
S4: the MCU and the GPS module of the positioning device are awakened regularly or when the G-sensor is interrupted, after being awakened, the positioning device opens an FSK receiver of the wireless communication module to receive real-time ephemeris, local position information and local time information broadcasted by a base station gateway, and injects the real-time ephemeris, the local position information and the local time information into the GPS module of the positioning device, so that the GPS module is switched from a cold start mode to a hot start mode, the positioning time can be controlled at a second level, and the GPS module acquires specific position information of the positioning device; the positioning device is provided with a G-sensor, and when the motion touch is interrupted, the positioning device MCU is awakened to receive the real-time ephemeris. The positioning device can receive the real-time ephemeris after being awakened, and therefore can enter a hot start mode instead of a warm start or cold start mode so as to reduce the power consumption of the positioning device. The local position information and time acquired by the base station gateway in step S1 are assisted position and time information, and after the acquired assisted position, time and ephemeris information are injected into the GPS module of the positioning apparatus, the acquisition time can be further reduced, and the positioning can be performed more quickly, especially in weak signals.
S5: the positioning device uploads specific position information to the base station gateway through the LORA transmitter of the wireless communication module, and then the GPS module, the MCU, the FSK receiver and the LORA transmitter all enter a sleep mode to wait for being awakened next time;
s6: and the wireless communication module of the base station gateway receives the specific position information transmitted by the positioning device by adopting an LORA modulation mode, and further performs back-end processing. Because the transmitted specific position information has the characteristics of small data quantity, long transmission distance and the like, an LORA modulation mode is adopted.
Two sets of systems, namely an FSK modulation mode and an LORA modulation mode, adopted by a wireless communication module of a base station gateway respectively adopt different frequency bands, belong to a pilot frequency duplex mode, and optimize the working time of a node transceiver. In this embodiment, the base station gateway broadcast frequency point is set to 510Mhz, the base station gateway receiving frequency point is 480Mhz, and the receiving and transmitting pilot frequency is separated by 30Mhz, so that the influence on the receiver can be reduced, and the influence of the base station gateway broadcast channel on the uplink of the positioning apparatus can be effectively avoided.
The base station gateway adopts a pilot frequency duplex mode, continuously broadcasts the latest ephemeris information in a cyclic and reciprocating mode, the positioning device can receive the latest ephemeris information as long as being awakened, and the two parties do not need synchronous processing so as to reduce the power consumption of the positioning device.
As shown in fig. 2, the present invention further provides a low power consumption GPS positioning system, which includes a positioning device, a base station gateway, and an a-GNSS server.
The positioning device comprises an MCU, a GPS module, a wireless communication module and a battery; MCU and GPS module line connection and all through battery powered, the GPS module adopts AT6558 chip, wireless communication module adopts SX1268 chip, and it supports FSK debugging mode and LORA debugging mode, and wireless communication module includes FSK receiver, LORA transmitter, and the real-time ephemeris of FSK receiver receiving base station gateway broadcast, and the LORA transmitter uploads positioner's specific position information to the base station gateway.
The base station gateway comprises an MCU, a GPS module, a wireless communication module, a wireless network module, a power supply and a display screen, wherein the display screen adopts an HMI (human machine interface), the wireless network module can be a 3G/4G/5G wireless network, and in the embodiment, the wireless network module adopts a more universal 4G wireless network; the base station gateway is provided with two independent wireless communication modules, one wireless communication module comprises an FSK transmitter, and the other wireless communication module comprises a real-time ephemeris obtained by covering the FSK transmitter by real-time broadcasting; one set includes a LORA receiver that receives specific location information transmitted by a positioning device. The wireless network module adopts a 4G CAT.1 module.
The MCU of the base station gateway is STM32F405, and the MCU model of the positioning device is STM 8L.
The base station gateway interacts with an A-GNSS server network through a wireless network module to acquire real-time ephemeris information; the positioning device and the base station gateway receive and send information through the wireless communication module, the base station gateway broadcasts the obtained real-time ephemeris continuously, the positioning device is awakened to receive the real-time ephemeris, the hot start mode is entered, specific position information is obtained, and the specific position information is sent to the base station gateway for back-end processing.
The positioning node and the base station gateway form a star network, the coverage area of the whole star network is 10km, and the GPS ephemeris sharing requirement is met.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept described herein, as determined by the above teachings or as determined by the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The low-power consumption GPS positioning method is characterized by comprising the following steps:
s1: a GPS module of a base station gateway acquires local position information and local time information in real time;
s2: the base station gateway and the A-GNSS server interact to obtain a real-time ephemeris;
s3: the base station gateway broadcasts and covers the acquired real-time ephemeris, local position information and local time information in real time;
s4: the method comprises the steps that after being awakened, a positioning device receives real-time ephemeris, local position information and local time information broadcast by a base station gateway, and injects the real-time ephemeris, the local position information and the local time information into a GPS module of the positioning device, the GPS module enters a hot start mode, and the GPS module acquires specific position information of the positioning device;
s5: the positioning device uploads specific position information to the base station gateway, and then the positioning device enters a sleep mode to wait for being awakened next time;
s6: and the base station gateway receives the specific position information transmitted by the positioning device and further performs back-end processing.
2. The low-power-consumption GPS positioning method of claim 1, wherein in step S3, the base station gateway broadcasts the acquired real-time ephemeris in real-time using FSK modulation.
3. The low-power-consumption GPS positioning method of claim 1, wherein in step S4, the positioning device receives the real-time ephemeris broadcast by the base station gateway through the FSK receiver.
4. The low power consumption GPS positioning method according to claim 1, wherein in step S5, the positioning device uploads specific location information to the base station gateway via the LORA transmitter.
5. The GPS positioning method with low power consumption of claim 1, wherein in step S6, the base station gateway receives the specific location information transmitted by the positioning device by using a LORA modulation method.
6. The low power consumption GPS positioning method of claim 1, wherein the distance between the broadcasting frequency point of the base station gateway in step S3 and the receiving frequency point of the base station gateway in step S6 is 30 Mhz.
7. The low-power consumption GPS positioning system is characterized by comprising a positioning device, a base station gateway and an A-GNSS server, wherein the positioning device comprises an MCU, a GPS module, a wireless communication module and a battery; the MCU is connected with the GPS module through a circuit and is powered by a battery; the base station gateway comprises an MCU, a GPS module, a wireless communication module, a wireless network module and a power supply, wherein the MCU is connected with the GPS module through a circuit and is powered by the power supply;
the base station gateway interacts with an A-GNSS server network through a wireless network module to acquire real-time ephemeris information;
the positioning device and the base station gateway receive and send information through the wireless communication module, the base station gateway broadcasts the obtained real-time ephemeris, the positioning device is awakened to receive the real-time ephemeris, the hot start mode is entered, specific position information is obtained, and the specific position information is sent to the base station gateway for back-end processing.
8. The low power consumption GPS positioning system of claim 7, wherein the wireless communication module of the positioning device comprises an FSK receiver for receiving real-time ephemeris broadcast by the base station gateway;
the wireless communication module of the positioning device also comprises a LORA transmitter which uploads the specific position information of the positioning device to the base station gateway.
9. The low power GPS positioning system of claim 7, wherein the wireless communication module of the base station gateway comprises an FSK transmitter that broadcasts real-time ephemeris acquired over real-time;
the wireless communication module of the base station gateway also comprises a LORA receiver for receiving the specific position information transmitted by the positioning device.
10. The low-power consumption GPS positioning system according to claim 7, wherein the wireless network module is a 3G/4G/5G wireless network.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112904372A (en) * | 2021-04-22 | 2021-06-04 | 电子科技大学 | Auxiliary satellite navigation system and positioning method thereof |
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