$GPRMC解析

$GPRMC解析

帧头	UTC时间	状态	纬度	北纬/南纬	经度	东经/西经	速度
$GPRMC	hhmmss.sss	A/V	ddmm.mmmm	N/S	dddmm.mmmm	E/W	节

方位角	UTC日期	磁偏角	磁偏角方向	模式	校验	回车换行
度	ddmmyy	000 - 180	E/W	A/D/E/N	*hh	CR+LF

格 式：

$GPRMC,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>*hh<CR><LF>

             $GPRMC,024813.640,A,3158.4608,N,11848.3737,E,10.05,324.27,150706,,,A*50

说 明：

字段 0：$GPRMC，语句ID，表明该语句为Recommended Minimum Specific GPS/TRANSIT Data(RMC)推荐最小定位信息

字段 1：UTC时间，hhmmss.sss格式

字段 2：状态，A=定位，V=未定位

字段 3：纬度ddmm.mmmm，度分格式(前导位数不足则补0)

字段 4：纬度N(北纬)或S(南纬)

字段 5：经度dddmm.mmmm，度分格式(前导位数不足则补0)

字段 6：经度E(东经)或W(西经)

字段 7：速度，节，Knots(一节也是1.852千米／小时)

字段 8：方位角，度(二维方向指向，相当于二维罗盘)

字段 9：UTC日期，DDMMYY格式

字段10：磁偏角，(000 - 180)度(前导位数不足则补0)

字段11：磁偏角方向，E=东，W=西

字段12：模式，A=自动，D=差分，E=估测，N=数据无效(3.0协议内容)

字段13：校验值

对应的程序代码如下：

package cc.oyz.gps;


import lombok.Data;
import org.apache.log4j.Logger;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

/**
 * @description:
 * @author: libin.hao
 * @time: 2021/3/31 9:43
 */
@Data
public class GPRMC extends GpsInfoRecord {

    private static Logger log = Logger.getLogger(GPRMC.class);

    private static SimpleDateFormat dateFormat = new SimpleDateFormat("ddMMyy HHmmss.SSS");

    static {
        // set the timezone for analysis of dates on UTC
        dateFormat.setCalendar(Calendar.getInstance(TimeZone.getTimeZone("UTC")));
    }

    private boolean isValid;
    private double latitude;
    private double longitude;
    private Date readingDate;



    protected GPRMC(String[] fields) {
        super(fields);

        try {
            this.readingDate = dateFormat.parse(fields[9] + " " + fields[1]);
        } catch (ParseException e) {
            log.error("Couldn't parse reading date", e);
            log.debug("Will assume _now_ as reading date");
            this.readingDate = new Date();
        }

        this.isValid = fields[2].equals("A");
        if(isValid){
            String rawLat = fields[3];
            String rawLong = fields[5];
            if(rawLat.length() > 0 && rawLong.length() > 0){
                int degrees = Integer.parseInt(rawLat.substring(0, 2));
                double minutes = Double.parseDouble(rawLat.substring(2));
                this.latitude = degrees + minutes / 60;
                if (fields[4].equals("S")) {
                    this.latitude *= -1;
                }
                degrees = Integer.parseInt(rawLong.substring(0, 3));
                minutes = Double.parseDouble(rawLong.substring(3));
                this.longitude = degrees + minutes / 60;
                if (fields[6].equals("W")) {
                    this.longitude *= -1;
                }
            }
        }
    }


    @Override
    public String toString() {

        return "GPRMC{" +
                "isValid=" + isValid +
                ", latitude=" + latitude +
                ", longitude=" + longitude +
                ", readingDate=" + readingDate +
                '}';
    }
}

package cc.oyz.gps;

/**
 * @description: gps信息记录
 * @author: libin.hao
 * @time: 2021/3/31 9:31
 */
public class GpsInfoRecord extends GpsEvent{

    protected String[] fields;


    public static GpsInfoRecord createRecord(String inputLine)
            throws InvalidInputException {
        if (inputLine.length() == 0) {
            throw new InvalidInputException("输入行为空");
        }
        if (inputLine.charAt(0) != '$') {
            throw new InvalidInputException("Record doesn't start with $");
        }
        int checksumPos = inputLine.indexOf('*');
        if (checksumPos != -1) {
            /*
             * FIXME has checksum, let's check it.... but, for now, let's just
             * strip it
             */
            inputLine = inputLine.substring(0, checksumPos);
        }

        String[] fields = inputLine.substring(1).split(",");
        if (fields[0].equals("GPRMC")) {
            return new GPRMC(fields);
        } else {
            return new UnknownGpsInfoRecord(fields);
        }
    }


    public GpsInfoRecord(String[] fields) {
        this.fields = fields;
    }

    public int getFieldsCount() {
        return fields.length;
    }

    public String getField(int index) {
        return fields[index];
    }

    public String toString() {
        return fields[0] + " (from GpsEvent)";
    }


}

package cc.oyz.gps;

/**
 * @description: gps事件监听
 * @author: libin.hao
 * @time: 2021/3/31 9:29
 */
public abstract class GpsEvent {
}

package cc.oyz.test.gps;

import cc.oyz.gps.GPRMC;
import cc.oyz.gps.GpsInfoRecord;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.io.BufferedReader;
import java.io.FileReader;
import java.text.SimpleDateFormat;

/**
 * @description:
 * @author: libin.hao
 * @time: 2021/3/31 9:52
 */
// 让 JUnit 运行 Spring 的测试环境， 获得 Spring 环境的上下文的支持
@RunWith(SpringJUnit4ClassRunner.class)
// 获取启动类，加载配置，确定装载 Spring 程序的装载方法，它回去寻找 主配置启动类(被 @SpringBootApplication 注解的)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class GpsTest {

    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

    //解析单体数据
    @Test
    public void gpsStr(){
        String str = "$GPRMC,064159.000,A,4002.3959,N,11619.5986,E,5.93,189.9,310321,,*34";
        try {
            GpsInfoRecord record = GpsInfoRecord.createRecord(str);
            if(record instanceof GPRMC){
                GPRMC gprmc = (GPRMC) record;
                String formatDate = simpleDateFormat.format(gprmc.getReadingDate());

                System.out.println("格式化时间：" + formatDate);
                System.out.println(gprmc);
            }
        }catch (Exception e){
            System.err.println("错误日志：" + e.getMessage());
        }
    }




}

打印结果：

格式化时间：2021-03-31 02:41:59
GPRMC{isValid=true, latitude=40.03993166666667, longitude=116.32664333333334, readingDate=Wed Mar 31 14:41:59 CST 2021}