CN113447967B - Application processor chip integrating satellite navigation baseband IP and integration method - Google Patents
Application processor chip integrating satellite navigation baseband IP and integration method Download PDFInfo
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- CN113447967B CN113447967B CN202110718113.5A CN202110718113A CN113447967B CN 113447967 B CN113447967 B CN 113447967B CN 202110718113 A CN202110718113 A CN 202110718113A CN 113447967 B CN113447967 B CN 113447967B
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Classifications
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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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention relates to an application processor chip integrating satellite navigation baseband IP and an integration method. The application processor chip of the integrated satellite navigation baseband IP comprises a CPU, a history information storage unit, a navigation signal storage unit, a channel operation storage unit, a clock unit and an asynchronous receiving and transmitting serial port unit, and also comprises 1 navigation channel operation unit, wherein the navigation channel operation storage unit is a RAM (random access memory) in the application processor chip and is divided into N sections of address spaces, N is more than or equal to 4 and is an integer; the navigation channel operation unit adopts time division multiplexing, allocates a period of time to each channel for operation, and the operation results are respectively stored in the N operation storage units; the clock frequency of the clock unit is at least increased to N times of the GPS or Beidou intermediate frequency sampling frequency according to the received GPS signals or Beidou signals, the GPS is a global satellite positioning system, the intermediate frequency sampling frequency is more than or equal to 4.092MHz, the Beidou is a global satellite navigation system, and the intermediate frequency sampling frequency is more than or equal to 8.184MHz.
Description
Technical Field
The invention relates to an integrated satellite navigation baseband IP in an application processor chip, in particular to an application processor chip integrating the satellite navigation baseband IP and an integration method.
Background
Methods for adding satellite navigation functions in systems requiring satellite navigation equipment such as mobile phones, PDAs or vehicle navigation are divided into three types: firstly, selecting a satellite navigation module; secondly, a navigation chip set (a baseband chip and a radio frequency receiving chip) or a single chip is selected, and the two modes have the advantages of simplicity and easiness in use, and the defects of large size, high cost and high power consumption of the satellite navigation module and the navigation chip set; and thirdly, directly integrating the satellite navigation baseband IP into an application processor chip of the satellite navigation baseband, processing and producing the satellite navigation baseband by adopting the process of the processor chip, and integrating the radio frequency chip into a radio frequency module. The method has the advantages of small volume, low cost and low power consumption, and has the defects of high integrated design difficulty and higher early-stage cost.
Fig. 1 is a schematic diagram of a conventional satellite navigation system architecture. Comprising the following steps: the system comprises a CPU, a BBRAM navigation history information storage unit, a navigation signal storage unit, N channel units, an asynchronous receiving and transmitting serial port unit and a clock unit.
Navigation signal storage unit: the received information containing all navigation satellite signals is stored.
BBRAM navigation history information storage unit: when the last navigation is finished, main navigation information is stored and used for starting the next navigation function, so that quick positioning is realized.
CPU: and the central processing unit controls the system to run and performs functions such as protocol processing, positioning calculation, communication and the like.
Channel 1 to channel N: the system comprises a capturing, tracking, bit synchronizing and frame synchronizing channel units, wherein the functions of the channel units are the same, and the capturing, tracking, bit synchronizing and frame synchronizing channel units comprise two functional units of storage and operation. The storage is used for storing all data of the channel operation process, which is also called a channel operation storage unit. The operations are navigation channel operation units, including various operations.
The satellite navigation baseband signal processing adopts an SOC system architecture and is divided into two parts of hardware and software.
The software part mainly comprises a baseband circuit capture strategy control algorithm, a loop tracking control algorithm, interrupt processing, satellite constellation and frequency point selection, positioning position and timing information calculation, NEMA-0183 protocol processing of positioning timing information output, A-GNSS protocol processing, communication control of an asynchronous receiving and transmitting transmitter and the like, wherein a central processing unit CPU is responsible for processing, and a serial processor of ARM company or a CPU of other companies is usually selected.
The hardware part receives signals output from the radio frequency front end receiving chip, the radio frequency front end chip comprises an ADC unit module, and the output signals are digital signals. The digital signal contains information of all navigation satellites, and each satellite signal is processed by one channel or a plurality of channels. Each channel comprises a storage unit module and an operation unit module, the processing of each channel on satellite signals specifically comprises capturing, tracking, bit synchronization, frame synchronization, data demodulation, measurement data extraction and the like, and the processing method of each channel is completely consistent.
Currently, the satellite navigation baseband IP is integrated in an application processor chip, and can be integrated in multiple layers. Firstly, integrating satellite navigation baseband IP to an application processor chip; and secondly, the other parts are directly integrated into the application processor chip by partially utilizing the resources of the application processor chip, such as a CPU (Central processing Unit), a serial port and the like. However, these two integration methods do not fully utilize the resources in the application processor chip, so that the satellite navigation baseband IP and the application processor chip are fused in depth.
Disclosure of Invention
The invention aims to solve the technical problems that the prior method for integrating satellite navigation baseband IP in an application processor chip does not fully utilize resources in the application processor chip and can not enable the satellite navigation baseband IP to be fused with the processor chip in depth, and provides an application processor chip for integrating the satellite navigation baseband IP and an integration method.
The technical idea of the invention is as follows: the application processor chip in the mobile phone, PDA or vehicle navigation equipment contains one or more CPU, RAM, asynchronous receiving and transmitting serial port unit, history information memory in the processor, clock unit and other large amount of resources, when the satellite navigation baseband IP is integrated in the application processor chip, only one navigation channel operation unit is integrated in the existing application processor chip, and the satellite navigation baseband chip system can be formed by using the resources of the application processor chip through time division multiplexing of the navigation channel operation unit.
The technical scheme of the invention is as follows:
the invention provides an application processor chip of an integrated satellite navigation baseband IP, which comprises a CPU, a history information storage unit, a navigation signal storage unit, a channel operation storage unit, a clock unit and an asynchronous receiving and transmitting serial port unit;
the navigation channel computing unit is also included, and the number of the navigation channel computing units is 1;
the channel operation storage unit is a RAM (random access memory) in the application processor chip, the channel operation storage unit divides the RAM into N sections of address spaces, the RAM in each section of address space corresponds to one channel operation storage unit, N is the maximum configurable channel number in the application processor chip, N is more than or equal to 4, N is an integer, and N is programmed according to the internal resources of the application processor chip;
the N sections of RAM address spaces form a channel operation storage unit of N processing channels of the application processor chip; the navigation channel operation unit adopts time division multiplexing, allocates a period of time to each channel for operation, and the operation results are respectively stored in a channel operation storage unit formed by N processing channels of the application processor chip;
the clock frequency of the clock unit is at least increased to be N times of the intermediate frequency sampling frequency of the GPS or the Beidou according to the received GPS signals or the Beidou signals, the GPS is a global satellite positioning system, the intermediate frequency sampling frequency is more than or equal to 4.092MHz, the Beidou is a global satellite navigation system, and the intermediate frequency sampling frequency is more than or equal to 8.184MHz.
Further, the channel operation storage unit divides the RAM into N sections of address spaces, wherein the range of N values is 8-192, and N is an integer.
Further, the application processor chip is an application processor chip of a mobile phone, a PDA or a vehicle navigation device.
The invention also provides an integration method of the application processor chip of the integrated satellite navigation baseband IP, which comprises the following steps:
(1) Only one navigation channel operation unit of satellite navigation baseband IP is integrated on the existing application processor chip; the navigation signal storage unit, the channel operation storage unit, the CPU, the history information storage unit, the clock unit and the asynchronous receiving and transmitting serial port unit utilize the internal resources of the application processor chip;
(2) The method comprises the steps that a channel operation storage unit uses a RAM (random access memory) in an existing application processor chip, the channel operation storage unit is divided into N sections of address spaces, the RAM of each section of address space corresponds to one channel operation storage unit, N is the maximum number of channels which can be configured in the application processor chip, N is more than or equal to 4, N is an integer, and N is programmed according to the internal resources of the application processor chip;
(3) The clock frequency of the clock unit is at least increased to N times of the intermediate frequency sampling frequency of the GPS or the Beidou according to the received GPS signals or the Beidou signals, the GPS is a global satellite positioning system, the intermediate frequency sampling frequency is more than or equal to 4.092MHz, the Beidou is a global satellite navigation system, and the intermediate frequency sampling frequency is more than or equal to 8.184MHz. .
In the implementation operation, the three aspects of the method for integrating the application processor chip of the satellite navigation baseband IP have no fixed sequence, and a designer can arrange the integration sequence by himself.
Compared with the prior art, the invention has the advantages that:
1. compared with the existing application processor chip integrating the satellite navigation baseband IP, the invention omits a CPU, a BBRAM navigation history information storage unit, a navigation signal storage unit, a channel operation storage unit in N channel units, an asynchronous receiving and transmitting serial port unit and a clock unit in the system, and can form a satellite navigation baseband chip system by integrating one navigation channel operation unit in the existing application processor chip, and by time division multiplexing of the navigation channel operation unit and simultaneously borrowing corresponding resources of the application processor chip. The design method fully utilizes the resources of the application processor chip and reduces the power consumption.
2. The invention is the deep fusion of the satellite navigation baseband IP and the application processor chip, and the storage unit in the channel unit of the satellite navigation baseband IP utilizes the RAM in the application processor chip, thereby being beneficial to the design of a time division multiplexing circuit and the integration of the satellite navigation baseband IP on the application processor chip and further reducing the area and the power consumption of the circuit.
Drawings
FIG. 1 is a schematic diagram of a conventional satellite navigation system architecture (clock unit not shown);
fig. 2 is a schematic architecture diagram of an application processor chip (clock unit is not shown) of the integrated satellite navigation baseband IP of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 2, the present embodiment provides an application processor chip of an integrated satellite navigation baseband IP, including a CPU, a history information storage unit, a navigation signal storage unit, a channel operation storage unit, and an asynchronous transceiver serial port unit;
navigation signal storage unit: the received information containing all navigation satellite signals is stored as a common RAM memory.
Navigation history information storage unit: the history information which needs to be memorized is stored, and the history information comprises main navigation information when the last navigation is finished.
CPU: the central processing unit or the multi-core processor is used for controlling the operation of the whole navigation system, and comprises the functions of navigation access protocol processing, positioning calculation, communication and the like.
Channel 1 operation memory, channel 2 operation memory-channel N operation memory: the storage of all data used for storing the channel operation process is also called a channel operation storage unit.
Software of the satellite navigation baseband IP runs on a CPU of the application processor chip; the historical information of the satellite navigation baseband IP is stored in a historical information memory of the application processor chip; the results of positioning and timing are output through an asynchronous transceiving serial port unit of the application processor chip.
The application processor chip of the integrated satellite navigation baseband IP also comprises 1 navigation channel operation unit, and the navigation channel operation unit respectively performs operation processing on each channel through time division multiplexing;
the channel operation storage unit is a RAM which is programmed and set according to the internal resources of the processor chip, and divides N sections of RAM address space to store the processing results of N channels; n is the maximum configurable channel number in the application processor chip, N is more than or equal to 4, N is an integer, and the preferable range of N is 8-192.
The application processor chip of the integrated satellite navigation baseband IP changes the original satellite signal processing of N channel units in the satellite navigation baseband IP into N times of calling of navigation channel operation units of the channel units through a time division multiplexing technology, and allocates a period of time to each operation storage channel for operation processing and data storage.
The clock frequency of the clock unit is at least increased to be N times of the GPS or Beidou intermediate frequency sampling frequency according to the received GPS or Beidou intermediate frequency sampling frequency, the GPS is a global satellite positioning system, the intermediate frequency sampling frequency is more than or equal to 4.092MHz, the Beidou is a global satellite navigation system, and the intermediate frequency sampling frequency is more than or equal to 8.184MHz.
When the design of the application processor chip integrating the satellite navigation baseband IP is carried out, only a navigation channel operation unit integrating the satellite navigation baseband IP is needed to be integrated on the application processor chip, and the CPU, the navigation signal storage unit, the channel operation storage unit, the history information storage unit, the clock unit and the asynchronous receiving and transmitting serial port unit of the satellite navigation baseband IP all utilize the internal resources of the application processor chip;
all D triggers in a storage unit in a channel unit of the satellite navigation baseband IP are changed into RAM in an application processor chip, the RAM in the application processor chip is divided into N sections of address spaces, each channel storage unit is a RAM for designating one section of address space and is used for storing information in a channel operation process, wherein N is the maximum configurable channel number in the application processor chip. N is programmed according to the internal resources of the application processor chip, N is more than or equal to 4, N is an integer, the precision and the accuracy of navigation and the configuration of the application processor chip are comprehensively considered, and the preferable range of N is as follows: 8-192;
the clock frequency of the clock unit is at least increased to be N times of the GPS or Beidou intermediate frequency sampling frequency by modifying the clock unit according to the received GPS intermediate frequency sampling frequency or Beidou intermediate frequency sampling frequency, the GPS is a global satellite positioning system, the intermediate frequency sampling frequency is more than or equal to 4.092MHz, the Beidou is a global satellite navigation system, and the intermediate frequency sampling frequency is more than or equal to 8.184MHz.
The english abbreviations appearing in the present invention are defined as follows:
ADC (AnalogtoDigital Converter): an analog signal/digital signal converter;
BBRAM (BaseBand RAM): a baseband random access memory;
RAM (Random Access Memory): a random access memory;
IP (Intellectual Property): intellectual property rights;
CPU (central processing unit): a central processing unit;
PDA (Personal Digital Assistant): palm computer;
SOC (System on Chip): a system-on-chip;
GPS (Global Positioning System): a global navigation positioning system.
Claims (4)
1. An application processor chip integrating a satellite navigation baseband IP comprises a CPU, a history information storage unit, a navigation signal storage unit, a channel operation storage unit, a clock unit and an asynchronous receiving and transmitting serial port unit;
the method is characterized in that:
the navigation channel computing unit is also included, and the number of the navigation channel computing units is 1;
the channel operation storage unit is a RAM (random access memory) in the application processor chip, the channel operation storage unit divides the RAM into N sections of address spaces, the RAM of each section of address space corresponds to the operation storage unit of one channel, N is the maximum number of channels which can be configured in the application processor chip, N is more than or equal to 4, and N is an integer;
the N sections of RAM address spaces form a channel operation storage unit of N processing channels of the application processor chip; the navigation channel operation unit adopts time division multiplexing, allocates a period of time to each channel for operation, and the operation results are respectively stored in the channel operation storage units of N processing channels of the application processor chip;
the clock frequency of the clock unit is at least increased to be N times of the intermediate frequency sampling frequency of the GPS or the Beidou according to the received GPS signals or the Beidou signals, the GPS is a global satellite positioning system, the intermediate frequency sampling frequency is more than or equal to 4.092MHz, the Beidou is a global satellite navigation system, and the intermediate frequency sampling frequency is more than or equal to 8.184MHz.
2. The integrated satellite navigation baseband IP application processor chip of claim 1, wherein: the channel operation storage unit divides the RAM into N sections of address spaces, the value range of N is 8-192, and N is an integer.
3. The application processor chip of an integrated satellite navigation baseband IP of claim 1 or 2, wherein: the application processor chip is an application processor chip of a mobile phone, a PDA or a vehicle navigation device.
4. An integration method of an application processor chip integrating satellite navigation baseband IP is characterized in that:
(1) Only one navigation channel operation unit of satellite navigation baseband IP is integrated on the existing application processor chip; the satellite navigation signal storage unit, the channel operation storage unit, the CPU, the history information storage unit, the clock unit and the asynchronous receiving and transmitting serial port unit utilize the internal resources of the application processor chip;
(2) The method comprises the steps that a channel operation storage unit uses RAM (random access memory) in an existing application processor chip, N sections of address spaces are divided from the RAM of the channel operation storage unit, the RAM of each section of address space corresponds to the operation storage unit of one channel, N is the maximum number of channels which can be configured in the application processor chip, N is greater than or equal to 4, and N is an integer;
(3) The clock frequency of the clock unit is improved to be at least N times of the GPS or Beidou intermediate frequency sampling frequency through the transformation of the clock unit according to the received GPS signals or the Beidou signals, the GPS is a global satellite positioning system, the intermediate frequency sampling frequency is more than or equal to 4.092MHz, the Beidou is a global satellite navigation system, and the intermediate frequency sampling frequency is more than or equal to 8.184MHz.
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