dgps receiver

1. Standard NMEA0183 statements1. Global Positioning System Fix Data (GGA) GPS Positioning Information$ GPGGA, 2. gps dop and Active Satellites (GSA) current satellite information$ GPGSA, 3. GPS Satellites in View (GSV) Visible satellite information$ GPGSV, Note: 4. Recommended Minimum Specific GPS/TRANSIT Data (RMC) Recommended positioning information$ Uplmc, 5. Track Made Good and Ground Speed (VTG) Ground Speed information$ GPVTG, 6. Geographic Position (GLL) Location Geographic Information$

(Broadcastreceiver) is used to receive broadcast intent, and the broadcast intent is sent by calling Context.sendbroadcast (), Context.sendorderedbroadcast () To achieve. Typically a broadcast intent can be received by multiple broadcast receivers subscribed to this intent, which is similar to topic message recipients in JMS. The method to implement a broadcast receiver is as follows:The first step: Inherit Broadcastreceiver and override the OnReceiv

Document directory Source code Source code Source code Command mode is the behavior mode of the object. The command mode is also called action mode or transaction mode. In command mode, a request or operation is encapsulated into an object. The command mode allows the system to parameterize the client using different requests, queue requests or record request logs, and provides command revocation and recovery functions.Command mode structure 　　Command mode is the encapsulation of command

the risk of errors. The server system needs to run continuously for a long time, and the accumulation of operations may eventually have a major impact on the entire server. The iis server provides external services in multi-thread mode, which is relatively stable. However, experienced web server managers usually regularly check and restart the servers, to prevent unexpected faults. 3. asynchronous mode Synchronous and asynchronous mechanisms in network communication are the concepts of communic

In the previous article, we analyzed the process of receiver receiving data in detail, and sent the meta-information of data to Receivertracker during receiver receiving data:This article will analyze the architecture design and concrete implementation of receivertracker in detail. First,the main function of Receivertracker The main functions of Receivertracker are:1.start receivers on the executor2.accept

One: the definition of the command pattern---> Command mode is a high-cohesion mode---> Encapsulates a request into an object, allowing you to parameterize the client with different requests, queue requests, or log request logs to provide undo and redo functions for the command.Role of---> Command modeReceive receiver role ==> this role is the role of the job, the command is delivered here should be executedcommand commands the role ==> all the comman

This paper mainly introduces Broadcastreceiver concept, use, life cycle, security, classification, special broadcastreceiver (local, sticky, orderly, sticky and orderly broadcasting). example code see BROADCASTRECEIVERDEMO, example apk see:trineaandroiddemo.apk. 1. Concept introduction and the difference between the two ways of registrationBroadcastreceiver as one of the four components of Android, unlike activity, there is no interface to display. Broadcastreceiver consists of two concepts, the

1.Android Broadcast Mechanism overviewAndroid broadcasts are divided into two areas: the broadcast sender and the broadcast receiver, usually broadcastreceiver refers to the broadcast recipient (broadcast receiver). Broadcast as a means of communication between Android components, you can use the following scenarios:1. Message communication within the same component inside the same app (between single or mu

Android notes. BroadcastReceiver, broadcastreceiverBroadcast is a mechanism widely used to transmit information between applications. BroadcastReceiver is a component that filters and receives and responds to sent broadcasts. BroadcastReceiver is essentially a global listener used to listen to global broadcast messages of the system and receive specified broadcasts. Therefore, it can easily implement communication between different components in the system. The knowledge point structure of Broad

, which avoids copying.3. If the recipient is a large structure or an array, then the pointer type recipient is more efficient. (How big is it?) Suppose you pass all the elements of the recipient as parameters to the method, and if you think that the parameters are a bit more, then it is large.4. Can the recipient be modified when calling functions and methods concurrently in this method? A recipient of a value type creates a copy when the method is called, so the external modification does not

Requestpeers () to get a list of the most recent peer-network (devices). Wifi_p2p_state_changed_action This broadcast is sent when the device's Wi-Fi peer is enabled or disabled. This broadcast is sent when the device's Wi-Fi peer is enabled or disabled. Wifi_p2p_this_device_changed_action This broadcast is sent when the details of the device are modified, such as the name of the device. 2. Create a broadcast

is the binary form of the data, the connection layer is the signal form of the data. It would be interesting to see the world in a different way, and it would be more like a whole to look at the four layers.When the data is sent through these four layers, the data is used as the body after each layer, and the control information of this layer is added as the header. When the destination is reached, this passes through layer four, each layer will be stripped of the corresponding header, and fina

}, Context.bind_auto_create);}Broadcast Receiver ( broadcast receiver )Broadcast receiver is used to receive and process broadcast notifications (broadcast announcements). Broadcastreceive has 1, system broadcast events, such as: action_boot_completed (triggered when the system starts to complete), action_time_changed (triggered when the system time changes), Act

1. Scenario Simulation Use software to simulate the Boot ProcessPress start.Then Power SupplyThe motherboard starts power-on self-check.BiOS searches for the BIOS of other devices in turn and asks them to initialize self-checkStart to detect CPU, memory, optical disc, hard disk, optical drive, serial port, parallel port, and out-of-the-box driveGo to system boot The preceding process can be abstracted as follows:The client only wants to send commands or requests. It does not care who the real

TCP traffic control 1. Implement traffic control using sliding windows If the sender sends data too quickly, the receiver may not be able to receive the data, which may cause data loss. The so-calledTraffic ControlIt is to make the sender's sending speed not too fast, so that the receiver can receive it in time. The sliding window mechanism can be used to conveniently control the traffic of the sender over

requests, send SMTP establishment and ConnectionCreate a two-way transmission channel between receiving and SMTP. Receiving SMTP can be either the final receiver orInter-carrier. The SMTP command is sent by the sending SMTP, and received by the receiving SMTP, and the response is reversed.Send.Once the transfer channel is established, the SMTP sender sends the MAIL command to specify the MAIL sender. IfIf an SMTP recipient can receive an email, an OK

is short and the child threads may not have endedThe Broadcastreceiver will be finished first. Once the broadcastreceiver is over, this broadcastreceiverThe process is easy to kill when the system needs memory because it belongs to an empty process (a process without any active components). If its host process is killed, then the working child thread will be killed. So using sub-threading to solve is unreliable.Broadcast type and broadcast typeGeneral Broadcast (Normal broadcasts)Send a broadca

one of the most widely used serial interfaces in PC and communication industry. A RS-232 is defined as a single-ended standard that increases communication distances in low-rate serial communication. The RS-232 adopts the unbalanced transmission mode, that is, the so-called single-ended communication. Figure 1 (see the figure below) The data signal sent and received is relative to the signal location. For example, the data sent from the DTE device is 2-pin relative to 7-pin (Signal Locat

In enterprise-level development, relational databases are designed for interface transmission. This article takes oracle database as an example to discuss some design ideas about using databases for intermediate table data transmission during enterprise-level development. You are welcome to leave a message to correct your request. 1. The principle of who controls the definition of privilege is that the receiver defines the interface data lattice. In e

summarized as follows:1. The broadcast receiver Broadcastreceiver the AMS (activity Manager Service) through the binder mechanism;2. Radio senders transmit their broadcasts to AMS through the binder mechanism;3.AMS find the Broadcastreceiver that meet the corresponding conditions (intentfilter/permission, etc.), send the broadcast to the broadcastreceiver (usually the activity) corresponding message loop queue;4. Message loop execution get this broad