1 /*
2 * Licensed to the Hipparchus project under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The Hipparchus project licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * https://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.hipparchus.filtering.kalman;
19
20 import org.hipparchus.linear.RealMatrix;
21 import org.hipparchus.linear.RealVector;
22
23 /**
24 * Interface defining a measurement on process.
25 * @since 1.3
26 */
27 public interface Measurement {
28
29 /** Get the process time.
30 * @return process time (typically the time or index of a measurement)
31 */
32 double getTime();
33
34 /** Get the measurement vector.
35 * @return measurement vector
36 */
37 RealVector getValue();
38
39 /** Get the measurement covariance.
40 * @return measurement covariance
41 */
42 RealMatrix getCovariance();
43
44 }