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(New page: == What is GPS == The Global Positioning System (GPS) is a a satellite positioning system, using a constellation of 31 satellites. GPS uses these as "man-made stars" to calculate positio...)
 
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== What is GPS ==
+
{{Languages|Gpsd}}
  
−
The Global Positioning System (GPS) is a a satellite positioning system, using a constellation of 31 satellites.
 
  
−
GPS uses these as "man-made stars" to calculate positions to within a meter. With some forms of GPS. measurements accurate to  better than a centimeter can be made.
 
  
−
With advancing technology, receivers have shrunk from several dozen ICs and hundreds of other components, to one, and a handfull.
 
  
−
This has drastically reduced costs.
+
== GPS的內容 ==
  
−
The reducing cost has enabled it to be easily integrated in phones, laptops, cameras, as well as more traditional apparatus such as farming equipment, navigation systems and construction equipment.
+
GPS (Global Positioning System)是一個衛星定位系統，使用31個衛星。
  
−
(Another helpful overview [http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html Global Positioning System Overview])
+
GPS 類似 "人造衛星" ，以公尺為計算單位。某些形態的GPS，可以較公分為佳的單位進行度量。
 +
 
 +
利用先進的科技，從IC及其它的元件中接收訊號。
 +
 
 +
它大量的降低了成本。
 +
 
 +
因為它大量降低成本的特性，它可以輕鬆的被整合到手機、筆記型電腦及像是耕作用具、瀏覽系統及建築物...等傳統工具中。tion systems and construction equipment.
 +
 
 +
(你可以在這個位址[http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html Global Positioning System Overview]取得其它的相關資訊。)
  
 
== [[Hardware:AGPS|AGPS]] ==
 
== [[Hardware:AGPS|AGPS]] ==
−
is described on a [[Hardware:AGPS|page of its own]].
+
這個分類中可以找到[[Hardware:AGPS|所有GPS的資訊]].
  
 
== PMB 2520 Hammerhead ==
 
== PMB 2520 Hammerhead ==
−
The PMB 2520 Hammerhead is a one-chip solution for GPS that is produced by Infineon Technologies in cooperation with Global Locate. It allows the usage of assistance data by supporting A-GPS standards.
+
PMB 2520 Hammerhead是GPS的one-chip解決方案，它由全球定位公司的Infineon Technologies所製造。它允許支援A-GPS標準的資料存取。
−
 
+
(相關的資料都可以在 PMB 2520 datasheet中找到)
−
(all infomation is coming from the datasheet of PMB 2520)
+
 
[http://www.infineon.com/upload/Document/cmc_upload/documents/011/4061/pmb2520-pb-200505.pdf short datasheet]
 
[http://www.infineon.com/upload/Document/cmc_upload/documents/011/4061/pmb2520-pb-200505.pdf short datasheet]
−
=== Modules of the Hammerhead===
 
  
−
The Hammerhead consists of the following modules:
+
=== Hammerhead模組===
 +
 
 +
Hammerhead包含了以下的模組：
 
*RF front-end with on-chip, high gain and low noise, LNA, I/Q mixers, on-chip polyphase complex IF filter, digitally controlled AGC, and 3-bits ADC for the I and Q paths.
 
*RF front-end with on-chip, high gain and low noise, LNA, I/Q mixers, on-chip polyphase complex IF filter, digitally controlled AGC, and 3-bits ADC for the I and Q paths.
−
*Sigma-Delta RF PLL with on-chip PCO and on-chip loop filter.
+
*包含on-chip PCO及on-chip loop filter。
 
*Embedded PLL and NCO for baseband clock generation.
 
*Embedded PLL and NCO for baseband clock generation.
−
*Multiple channels digital mixers and parallel correlator engines to enable real time correlation of the PRN code for up to 14 satellites.
+
*多頻道數位混音器及平行相關引擎，做為至少提供給14個衛生使用的即時啟動PRN程式。
−
*Post processor including peak detection logic
+
*包含流量偵測邏輯判斷的Post processor
−
*SRAM for storing correlation results
+
*用來搜尋相關結果的SRAM
  
−
=== Host Interface ===
+
=== 主要界面 ===
  
−
The Hammerhead integrates 3 serial interfaces:
+
Hammerhead整合了三個系列的介面：
 
*UART
 
*UART
 
*I2C
 
*I2C
 
*SPI
 
*SPI
  
−
The UART in the Hammerhead is a full-duplex UART interface. It is fixed in 8N1(8 data bits, no parity, 1 stop bit) mode. On the GTA01, the host processor connect with the Hammerhead through the UART. In all models of Neo1973, this is connected to a serial port.
+
在Hammerhead的UART是一個full-duplex UART 界面。它被固定在8N1(8 data bits, no parity, 1 stop bit)模式。在GTA01中，主要的處理器透過UART連接到這裡。在Neo1973的所有產品當中，它連接到敘列埠。
  
−
=== Host software Architecture ===
+
=== 主軟體架構 ===
  
−
The Hammerhead driver software will be delivered as a binary, which can be interfaced to [http://gpsd.davisnetworks.com/bin/view/Main/GpsdHome gpsd] as it outputs NMEA information, as many serial GPSs do.
+
Hammerhead 驅動程式將會以二進位檔的方法載入，它可以像其它的GPS序列埠般，做為 [http://gpsd.davisnetworks.com/bin/view/Main/GpsdHome gpsd]的介面，輸入如NMEA 資訊。
  
−
The gps driver is [[Gllin|now available]]. (There were some problems in the past getting a license to distribute the binary. [http://lists.openmoko.org/pipermail/community/2007-July/008466.html])
+
gps驅動程式[[Gllin|目前已可以使用]]。(之前，它在取得套件二位元檔授權時，有一些問題 [http://lists.openmoko.org/pipermail/community/2007-July/008466.html])
  
−
The gpsd libraries provide the following infomation to the high level software:
+
gpsd程式庫提供下列的資訊，做為高階軟體：
 
*Position data
 
*Position data
 
*Library status
 
*Library status
 
*Time-out and Packet Available
 
*Time-out and Packet Available
  
−
The high level software sends the following messages to the plugin:
+
高階軟體傳送下列的訊息到plugin：
 
*Assistance data
 
*Assistance data
 
*Positioning Commands
 
*Positioning Commands
 
*Configuration Commands
 
*Configuration Commands
  
−
Gpsd communicates with the system at the following part:
+
Gpsd 利用以下的部份與系統進行溝通：
 
*Communications Drivers
 
*Communications Drivers
 
*System Timer
 
*System Timer
Line 62: Line 67:
 
*Log buffer
 
*Log buffer
  
−
== GPS on GTA01 ==
+
== GTA01上的GPS ==
  
−
At the GTA01, the host processor is a S3C2410.
+
在GTA01，主要的處理器是S3C2410。
  
−
=== Hammerhead on the GTA01 ===
+
=== GTA01上的Hammerhead ===
  
−
On the GTA01, the Hammerhead are configured that connected with the host processor through the UART. The UART of data output/input is connected to the UART 1 of the SC2410. The UART of the hardware flow control is connected to the UART 2 of the SC2410.
+
在GTA01上，Hammerhead被設定為透過UART連接到主處理器。UART 的資料輸入/輸出在SC2410上連接到UART 1。UART的硬體流量控制則連接到SC2410的UART 2。
  
 
== Q & A ==
 
== Q & A ==
  
  
−
====Q: Can gpsd support Differential GPS.====
+
====Q: gpsd支援不同的GPS嗎====
−
*While the neo does not have any means of receiving [http://en.wikipedia.org/wiki/Differential_GPS DGPS] or WAAS/SCCM directly, it can be streamed from an internet server.
+
*在neo無法有其它方法直接接收[http://en.wikipedia.org/wiki/Differential_GPS DGPS] 或WAAS/SCCM時，它可以直接從網際網路伺服器上接收串流。
−
*It may be possible to generate a global ionospheric model from stationary (charging?) neos that have GPS signal and cheap internet connections. This would enable very precise positions to be generated
+
*它可能從有gps訊號及便宜的網路連接的neo上，產生global ionospheric model。因此，它可以非常精準的產生位置資訊。
 
*This could generate positions accurate to well under a metre, compared to (probably) 2-3m without.
 
*This could generate positions accurate to well under a metre, compared to (probably) 2-3m without.
−
*The gpsd plugin is the place that these corrections would need to be done, as they need to be performed on a per-satellite basis, before generating the position.
+
*gpsd plugin是用來放置必須修正的錯誤的地方，如在產生位置時，在每個衛星上，他們必須能執行工作。
−
*This is separate from AGPS - AGPS gives information on current satellite position, or computes your position for you. DGPS is a local minute by minute 'ionospheric weather' for your region.
+
*它是與AGPS分開的 - AGPS在目前的衛星位置或者在電腦中發出資訊。DGPS是區域性的一個本地端minute by minute 'ionospheric weather'。
 +
請參考[[Server:A-GPS]]。
  
−
See also [[Server:A-GPS]].
+
====Q: 我們能上傳能在gpsd和hammerhead間互動的strace嗎?====
 +
*理想的狀況下，從沒有AGPS資料的狀況下，至少在一個半小時內，在收訊方為晴天的狀況下，它可以在每秒內取得GPS 位置。
 +
*視工程狀況而定。
 +
*[[Hammerhead/Protocol]]為reverse-engineering相關頁面。
  
−
====Q: Can someone upload somewhere an strace of the interaction between gpsd, and the hammerhead chip?====
+
====Q: 我可以自GPS上取得NMEA資料嗎====
−
*Ideally this would be requesting a GPS position every second, starting from 'cold', with no AGPS data, for at least half an hour, in an area where the reciever can see the sky.
+
−
*To aid in reverse engineering efforts.
+
−
*A reverse-engineering page has been created: [[Hammerhead/Protocol]]
+
  
−
====Q: Can I get NMEA data from the GPS?====
+
A: 無法直接取得資料。然而，gpsd 程式的'gpspipe'，加入 -r 則可以目前的位置，輸出NMEA資料。正確的方法是在程式裡使用libgpsd。
  
−
A: Not directly. However, the gpsd program 'gpspipe', with the -r switch will output NMEA data with the current position information. The right way to do it is to use libgpsd in your program if possible.
+
[[Category:GPS/zh tw]]
−
 
+
−
{{Languages|Gpsd}}
+
−
[[Category:GPS]]
+

Latest revision as of 22:24, 20 August 2008

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Contents

[edit] GPS的內容

GPS (Global Positioning System)是一個衛星定位系統，使用31個衛星。

GPS 類似 "人造衛星" ，以公尺為計算單位。某些形態的GPS，可以較公分為佳的單位進行度量。

利用先進的科技，從IC及其它的元件中接收訊號。

它大量的降低了成本。

因為它大量降低成本的特性，它可以輕鬆的被整合到手機、筆記型電腦及像是耕作用具、瀏覽系統及建築物...等傳統工具中。tion systems and construction equipment.

(你可以在這個位址Global Positioning System Overview取得其它的相關資訊。)

[edit] AGPS

這個分類中可以找到所有GPS的資訊.

[edit] PMB 2520 Hammerhead

PMB 2520 Hammerhead是GPS的one-chip解決方案，它由全球定位公司的Infineon Technologies所製造。它允許支援A-GPS標準的資料存取。 (相關的資料都可以在 PMB 2520 datasheet中找到) short datasheet

[edit] Hammerhead模組

Hammerhead包含了以下的模組：

  • RF front-end with on-chip, high gain and low noise, LNA, I/Q mixers, on-chip polyphase complex IF filter, digitally controlled AGC, and 3-bits ADC for the I and Q paths.
  • 包含on-chip PCO及on-chip loop filter。
  • Embedded PLL and NCO for baseband clock generation.
  • 多頻道數位混音器及平行相關引擎，做為至少提供給14個衛生使用的即時啟動PRN程式。
  • 包含流量偵測邏輯判斷的Post processor
  • 用來搜尋相關結果的SRAM

[edit] 主要界面

Hammerhead整合了三個系列的介面：

  • UART
  • I2C
  • SPI

在Hammerhead的UART是一個full-duplex UART 界面。它被固定在8N1(8 data bits, no parity, 1 stop bit)模式。在GTA01中，主要的處理器透過UART連接到這裡。在Neo1973的所有產品當中，它連接到敘列埠。

[edit] 主軟體架構

Hammerhead 驅動程式將會以二進位檔的方法載入，它可以像其它的GPS序列埠般，做為 gpsd的介面，輸入如NMEA 資訊。

gps驅動程式目前已可以使用。(之前，它在取得套件二位元檔授權時，有一些問題 [1])

gpsd程式庫提供下列的資訊，做為高階軟體：

  • Position data
  • Library status
  • Time-out and Packet Available

高階軟體傳送下列的訊息到plugin：

  • Assistance data
  • Positioning Commands
  • Configuration Commands

Gpsd 利用以下的部份與系統進行溝通：

  • Communications Drivers
  • System Timer
  • NV storage
  • Log buffer

[edit] GTA01上的GPS

在GTA01，主要的處理器是S3C2410。

[edit] GTA01上的Hammerhead

在GTA01上，Hammerhead被設定為透過UART連接到主處理器。UART 的資料輸入/輸出在SC2410上連接到UART 1。UART的硬體流量控制則連接到SC2410的UART 2。

[edit] Q & A

[edit] Q: gpsd支援不同的GPS嗎

  • 在neo無法有其它方法直接接收DGPS 或WAAS/SCCM時，它可以直接從網際網路伺服器上接收串流。
  • 它可能從有gps訊號及便宜的網路連接的neo上，產生global ionospheric model。因此，它可以非常精準的產生位置資訊。
  • This could generate positions accurate to well under a metre, compared to (probably) 2-3m without.
  • gpsd plugin是用來放置必須修正的錯誤的地方，如在產生位置時，在每個衛星上，他們必須能執行工作。
  • 它是與AGPS分開的 - AGPS在目前的衛星位置或者在電腦中發出資訊。DGPS是區域性的一個本地端minute by minute 'ionospheric weather'。

請參考Server:A-GPS。

[edit] Q: 我們能上傳能在gpsd和hammerhead間互動的strace嗎?

  • 理想的狀況下，從沒有AGPS資料的狀況下，至少在一個半小時內，在收訊方為晴天的狀況下，它可以在每秒內取得GPS 位置。
  • 視工程狀況而定。
  • Hammerhead/Protocol為reverse-engineering相關頁面。

[edit] Q: 我可以自GPS上取得NMEA資料嗎

A: 無法直接取得資料。然而，gpsd 程式的'gpspipe'，加入 -r 則可以目前的位置，輸出NMEA資料。正確的方法是在程式裡使用libgpsd。

Retrieved from "http://openmoko.org/index.php?title=Gpsd/zh_tw&oldid=47677"
Personal tools

What is GPS

The Global Positioning System (GPS) is a a satellite positioning system, using a constellation of 31 satellites.

GPS uses these as "man-made stars" to calculate positions to within a meter. With some forms of GPS. measurements accurate to better than a centimeter can be made.

With advancing technology, receivers have shrunk from several dozen ICs and hundreds of other components, to one, and a handfull.

This has drastically reduced costs.

The reducing cost has enabled it to be easily integrated in phones, laptops, cameras, as well as more traditional apparatus such as farming equipment, navigation systems and construction equipment.

(Another helpful overview Global Positioning System Overview)

AGPS

is described on a page of its own.

PMB 2520 Hammerhead

The PMB 2520 Hammerhead is a one-chip solution for GPS that is produced by Infineon Technologies in cooperation with Global Locate. It allows the usage of assistance data by supporting A-GPS standards.

(all infomation is coming from the datasheet of PMB 2520) short datasheet

Modules of the Hammerhead

The Hammerhead consists of the following modules:

  • RF front-end with on-chip, high gain and low noise, LNA, I/Q mixers, on-chip polyphase complex IF filter, digitally controlled AGC, and 3-bits ADC for the I and Q paths.
  • Sigma-Delta RF PLL with on-chip PCO and on-chip loop filter.
  • Embedded PLL and NCO for baseband clock generation.
  • Multiple channels digital mixers and parallel correlator engines to enable real time correlation of the PRN code for up to 14 satellites.
  • Post processor including peak detection logic
  • SRAM for storing correlation results

Host Interface

The Hammerhead integrates 3 serial interfaces:

  • UART
  • I2C
  • SPI

The UART in the Hammerhead is a full-duplex UART interface. It is fixed in 8N1(8 data bits, no parity, 1 stop bit) mode. On the GTA01, the host processor connect with the Hammerhead through the UART. In all models of Neo1973, this is connected to a serial port.

Host software Architecture

The Hammerhead driver software will be delivered as a binary, which can be interfaced to gpsd as it outputs NMEA information, as many serial GPSs do.

The gps driver is now available. (There were some problems in the past getting a license to distribute the binary. [1])

The gpsd libraries provide the following infomation to the high level software:

  • Position data
  • Library status
  • Time-out and Packet Available

The high level software sends the following messages to the plugin:

  • Assistance data
  • Positioning Commands
  • Configuration Commands

Gpsd communicates with the system at the following part:

  • Communications Drivers
  • System Timer
  • NV storage
  • Log buffer

GPS on GTA01

At the GTA01, the host processor is a S3C2410.

Hammerhead on the GTA01

On the GTA01, the Hammerhead are configured that connected with the host processor through the UART. The UART of data output/input is connected to the UART 1 of the SC2410. The UART of the hardware flow control is connected to the UART 2 of the SC2410.

Q & A

Q: Can gpsd support Differential GPS.

  • While the neo does not have any means of receiving DGPS or WAAS/SCCM directly, it can be streamed from an internet server.
  • It may be possible to generate a global ionospheric model from stationary (charging?) neos that have GPS signal and cheap internet connections. This would enable very precise positions to be generated
  • This could generate positions accurate to well under a metre, compared to (probably) 2-3m without.
  • The gpsd plugin is the place that these corrections would need to be done, as they need to be performed on a per-satellite basis, before generating the position.
  • This is separate from AGPS - AGPS gives information on current satellite position, or computes your position for you. DGPS is a local minute by minute 'ionospheric weather' for your region.

See also Server:A-GPS.

Q: Can someone upload somewhere an strace of the interaction between gpsd, and the hammerhead chip?

  • Ideally this would be requesting a GPS position every second, starting from 'cold', with no AGPS data, for at least half an hour, in an area where the reciever can see the sky.
  • To aid in reverse engineering efforts.
  • A reverse-engineering page has been created: Hammerhead/Protocol

Q: Can I get NMEA data from the GPS?

A: Not directly. However, the gpsd program 'gpspipe', with the -r switch will output NMEA data with the current position information. The right way to do it is to use libgpsd in your program if possible.

Geographylogo.png Languages:

English •  العربية •  Български •  Česky •  Dansk •  Deutsch •  Esperanto •  Eesti •  Español •  فارسی •  Suomi •  Français •  עברית •  Magyar •  Italiano •  한국어 •  Nederlands •  ‪Norsk (bokmål)‬ •  Polski •  Português •  Română •  Русский •  Svenska •  Slovenčina •  Українська •  ‪中文(中国大陆)‬ •  ‪中文(台灣)‬ •  Euskara •  Català