RANGECMP

Compressed version of the RANGE log

Platform:

OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7, SMART2

This log contains the RANGE data in a compressed format.

For dual antenna receivers, a RANGECMP_1 log can be requested to get RANGECMP data from the second antenna. As described in Table: Binary Message Header Structure, the message type indicates the log is from the second antenna. To request an ASCII log enter RANGECMPA_1, and for a binary log enter RANGECMPB_1.

Message ID: 140

Log Type: Synch

Recommended Input:

log rangecmpa ontime 10

ASCII Example:

#RANGECMPA,USB1,0,54.5,FINESTEERING,2209,512487.000,02000020,9691,16809;154,

04dc1018c2e70a40d6a37b0b9fb702f5531a616f20030000,

0b5c3011667f08400ea47b0bf32b559f501a546f20030000,

0bdc3002667f08f00aa47b0bb027559f631a5d6fe0020000,

04dcd001dd2408400aa47b0bc1e906de301a0e7440030000,

24dc1008122cf77f198ebc0ab3e387f221025f7bc0030000,

2b5c3001041ff96f1a8ebc0a0e1324812002e87560030000,

44dc1008fa5d0c6073fa260b0a8d9fac32124d7b80030000,

4b5c300100a309f097fa260b0cc9aaca4012e87520030000,

4bdc300200a309309dfa260bcaccaaca32124b7680030000,

44dcd001303c09e0c3fa260b1b378e8710127976e0030000,

449c1042175e0c607efa260b4b7e9fac30127a7680030000,

64dc10180ea8f00f2091680bcb3e8a81420c3e7b40030000,

6b5c3011410bf43f4991680b5b9218a9400c187600030000,

6bdc3002420bf47f4b91680b189518a9430c557640030000,

...

24de15181dcb00b02e50bd1457da6be063c25179e0020000,

649f14086ea6fd7fdfa6500a20df2dc9200b2b7be0030000,

64df3400ca2efe2fe2a6500ad00de6ce100b7476e0030000,

64df54002e17fe9fe3a6500a0b35518b200b5976c0030000,

849f1408c398f57f19a0dc0b79e06fc7400cef7920030000,

84df3410a5f4f73f29a0dc0bac969887210c6e7680030000,

84df5400f18bf74f28a0dc0bcb6ce1b9300c547640030000,

c49f14081d9a0d101c032b0c6dfa6994500e837ae0020000,

c4df341087840a504a032b0c8a2e24e0420e7a7620030000,

c4df5400900d0bf040032b0c9d7c6b90510e6176c0020000,

e49f1408a208f76f49cfe30b1bbac2c22017117880030000,

e4dff400a9f3f6ff35cfe30ba97395b04217527660030000,

e4df34013c3ef92f51cfe30bf503eeaa1017c175e0030000,

e43f74011a11f91f49cfe30b8bebfa832017547680030000,

e4df5400e2b6f86f34cfe30bbeb814b63017547600030000*5bf4bd0a

Field

Field Type

Description

Format

Binary Bytes

Binary Offset

1

Log header

RANGECMP header

For information about log headers, see ASCII, Abbreviated ASCII or Binary.

 

H

0

2

#obs

Number of satellite observations with information to follow

Ulong

4

H

3

1st range record

Compressed range log in format of Table: Range Record Format (RANGECMP only)

Hex

24

H+4

4

Next rangecmp offset = H+4 (#obs x 24)

5

xxxx

32-bit CRC (ASCII and Binary only)

Ulong

4

H+4+
(#obs x 24)

6

[CR][LF]

Sentence terminator (ASCII only)

-

-

-
Range Record Format (RANGECMP only)

Data

Description

Bits first to last

Length (bits)

Scale Factor

Units

Channel Tracking Status

Channel tracking status word

0-31

32

see Table: Channel Tracking Status

-

Doppler Frequency

Instantaneous carrier Doppler frequency

32-59

28

1/256

Hz

Pseudorange (PSR)

Pseudorange measurement

60-95

36

1/128

m

ADR

ADR (Accumulated Doppler Range) is calculated as follows:

ADR_ROLLS = (RANGECMP_PSR / WAVELENGTH + RANGECMP_ADR) / MAX_VALUE

Round to the closest integer

IF (ADR_ROLLS ≤ 0)
     ADR_ROLLS = ADR_ROLLS - 0.5
ELSE
     ADR_ROLLS = ADR_ROLLS + 0.5

At this point integerise ADR_ROLLS
CORRECTED_ADR = RANGECMP_ADR - (MAX_VALUE*ADR_ROLLS)
where
  ADR has units of cycles
  WAVELENGTH = 0.1902936727984 for GPS L1
  WAVELENGTH = 0.2442102134246 for GPS L2
  MAX_VALUE = 8388608

GLONASS satellites emit L1 and L2 carrier waves at a satellite-specific frequency, refer to the GLONASS section of An Introduction to GNSS available on our website at novatel.com/an-introduction-to-gnss

96-127

32

1/256

cycles

StdDev-PSR

Pseudorange measurement standard deviation

128-131

4

See Table: StdDev-PSR Values

m

StdDev-ADR

ADR measurement standard deviation

132-135

4

(n+1)/512

cycles

PRN/Slot

Refer to PRN Numbers

136-143

8

1

-

Lock Time

Number of seconds of continuous tracking (no cycle slipping)

This field is constrained to a maximum value of 2,097,151 which represents a lock time of 65535.96875 s (2097151/32).

144-164

21

1/32

s

C/No

Carrier to noise density ratio

The C/No is constrained to a value between 20-51 dB-Hz. Thus, if it is reported that C/No = 20 dB-Hz, the actual value could be less. Likewise, if it is reported that C/No = 51, the true value could be greater.

165‑169

5

(20+n)

dB-Hz

GLONASS Frequency number

GLONASS Frequency number

170-175

n+7

1

 

Reserved

176‑191

16
StdDev-PSR Values

Code

StdDev-PSR (m)

0

0.050

1

0.075

2

0.113

3

0.169

4

0.253

5

0.380

6

0.570

7

0.854

8

1.281

9

2.375

10

4.750

11

9.500

12

19.000

13

38.000

14

76.000

15

152.000