算法：获取雷达的目标经纬度信息

    @Test
    public void test() {

        // 雷达信息
        double radarLon = 120.283664;
        double radarLat = 29.892702;
        double northAngle = 26.5;

        // 目标信息
        float x = -13.7f * 0.1f;
        float y = 234.7f * 0.1f;
        float v = -1.3f;

        calculateTarget(radarLon, radarLat, northAngle, x, y, v);
    }


    public RadarTarget calculateTarget(double radarLon, double radarLat, double northAngle,
                                       double x, double y, double v) {
        // 1. 计算距离
        double distance = Math.sqrt(x * x + y * y);
        // 2. 计算方位角（弧度）
        double theta = Math.atan2(y, x);
        double bearing = Math.toRadians(26.5) + theta;
        // 3. 计算运动方向（相对于正北顺时针的角度）
        double direction = Math.toDegrees(bearing);
        if (direction < 0) {
            direction += 360;
        }

        // 4. 计算目标经纬度
        double northAngleRad = Math.toRadians(northAngle);
        double deltaX = x * Math.cos(northAngleRad) - y * Math.sin(northAngleRad);
        double deltaY = x * Math.sin(northAngleRad) + y * Math.cos(northAngleRad);

        System.out.println(deltaY);
        // 转换为经纬度 - 1度纬度对应的米数
        double deltaLon = deltaX / (111320 * Math.cos(Math.toRadians(radarLat)));
        double deltaLat = deltaY / 111320;

        double targetLon = radarLon + deltaLon;
        double targetLat = radarLat + deltaLat;

        return new RadarTarget(distance, targetLon, targetLat, direction, v);
    }