SubFrame1.java
/* Copyright 2002-2024 Thales Alenia Space
* Licensed to CS GROUP (CS) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* CS licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.orekit.gnss.rflink.gps;
import org.hipparchus.util.FastMath;
/**
* Container for sub-frames 1.
* <p>
* Table 20-1, sheet 1 and table 40-1, sheet 1 in
* <a href="https://navcen.uscg.gov/sites/default/files/pdf/gps/IS-GPS-200N.pdf">NAVSTAR
* GPS Space Segment/Navigation User Segment Interface</a>, IS-GPS-200N, 22 Aug 2022
* </p>
* @author Luc Maisonobe
* @since 12.0
*/
public class SubFrame1 extends SubFrame {
/** Index of Week Number field. */
private static final int WEEK_NUMBER = 7;
/** Index of C/A or P code field. */
private static final int CA_OR_P = 8;
/** Index of URA_INDEX index field. */
private static final int URA_INDEX = 9;
/** Index of SV Health field. */
private static final int SV_HEALTH = 10;
/** Index of IODC field. */
private static final int IODC = 11;
/** Index of L2 P data flag field. */
private static final int L2_P_DATA = 12;
/** Index of reserved field in word 4. */
private static final int RESERVED_4 = 13;
/** Index of reserved field in word 5. */
private static final int RESERVED_5 = 14;
/** Index of reserved field in word 6. */
private static final int RESERVED_6 = 15;
/** Index of reserved field in word 7. */
private static final int RESERVED_7 = 16;
/** Index of TGD field. */
private static final int TGD = 17;
/** Index of TOC field. */
private static final int TOC = 18;
/** Index of AF2 field. */
private static final int AF2 = 19;
/** Index of AF1 field. */
private static final int AF1 = 20;
/** Index of AF0 field. */
private static final int AF0 = 21;
/** */
/** Simple constructor.
* @param words raw words
*/
SubFrame1(final int[] words) {
// create raw container
super(words, AF0 + 1);
// populate container
setField(WEEK_NUMBER, 3, 20, 10, words);
setField(CA_OR_P, 3, 18, 2, words);
setField(URA_INDEX, 3, 14, 4, words);
setField(SV_HEALTH, 3, 8, 6, words);
setField(IODC, 3, 6, 2, 8, 22, 8, words);
setField(L2_P_DATA, 4, 29, 1, words);
setField(RESERVED_4, 4, 6, 23, words);
setField(RESERVED_5, 5, 6, 24, words);
setField(RESERVED_6, 6, 6, 24, words);
setField(RESERVED_7, 7, 14, 16, words);
setField(TGD, 7, 6, 8, words);
setField(TOC, 8, 6, 16, words);
setField(AF2, 9, 22, 8, words);
setField(AF1, 9, 6, 16, words);
setField(AF0, 10, 8, 22, words);
}
/** Get Week Number.
* @return week number
*/
public int getWeekNumber() {
return getField(WEEK_NUMBER);
}
/** Get C/A or P flag.
* @return C/A or P flag
*/
public int getCaOrPFlag() {
return getField(CA_OR_P);
}
/** Get URA index.
* @return URA index
*/
public int getUraIndex() {
return getField(URA_INDEX);
}
/** Get SV health.
* @return SV health
*/
public int getSvHealth() {
return getField(SV_HEALTH);
}
/** Get IODC.
* @return IODC
*/
public int getIODC() {
return getField(IODC);
}
/** Get L2 P data flag.
* @return L2 P data flag
*/
public int getL2PDataFlag() {
return getField(L2_P_DATA);
}
/** Get the reserved field in word 4.
* @return reserved field in word 4
*/
public int getReserved04() {
return getField(RESERVED_4);
}
/** Get the reserved field in word 5.
* @return reserved field in word 5
*/
public int getReserved05() {
return getField(RESERVED_5);
}
/** Get the reserved field in word 6.
* @return reserved field in word 6
*/
public int getReserved06() {
return getField(RESERVED_6);
}
/** Get the reserved field in word 7.
* @return reserved field in word 7
*/
public int getReserved07() {
return getField(RESERVED_7);
}
/** Get the TGD.
* @return TGD
*/
public int getTGD() {
return getField(TGD);
}
/** Get the TOC.
* @return TOC
*/
public int getTOC() {
return getField(TOC);
}
/** Get af₂.
* @return af₂ (second/second²)
*/
public double getAF2() {
return FastMath.scalb((double) getField(AF2), -55);
}
/** Get af₁.
* @return af₁ (second/second)
*/
public double getAF1() {
return FastMath.scalb((double) getField(AF1), -43);
}
/** Get af₀.
* @return af₀
*/
public double getAF0() {
return FastMath.scalb((double) getField(AF0), -31);
}
}