jps2rin HI computation error observed with 1M raw data file

[S.Szyszkoski]

This may not apply solely to the 1M, but we have noticed that when converting a .jps file to RINEX using jps2rin, the slant antenna height of the 1M is converted to an erroneous vertical distance. For the benefit of the developers, I've uploaded a zipped .jps file, the RINEX version 2.11 o-file by jps2rin, and a PDF page showing the 1M parameters input in the field.

You will note in the pdf that the 1M slant height is 4.5374 feet (1.383m). The RINEX file shows the slant as 1.38m (truncated at the cm level) and the vertical antenna height is shown as 1.3257 meters.

Given a 1M radius of 88.75 mm and a slant of 1.383 m, the vertical should be sqrt(1.383^2-.08875^2)=1.380m, not 1.3257 meters.

 

[Alexey Razumovsky]

jps2rin output for Hub4_104524.jps :
2.11 OBSERVATION DATA M (MIXED) RINEX VERSION / TYPE
JPS2RIN v.2.0.112 JAVAD GNSS 20160927 132319 UTC PGM / RUN BY / DATE
-Unknown- -Unknown- OBSERVER / AGENCY
Hub4 MARKER NAME
2P5QXWKUPTMBA0QYWF01JAVAD TRIUMPH_1M 3.6.6 Apr,27,2016 REC # / TYPE / VERS
115511.6145 -4373723.9880 4625566.0886 APPROX POSITION XYZ
-Unknown- JAVTRIUMPH_1MR NONE ANT # / TYPE
1.3257 0.0000 0.0000 ANTENNA: DELTA H/E/N
Antenna is slant; Height = 1.38 COMMENT

Evaluate:
Slant antenna height = 1.383m. Antenna radius = 0.08875m.
Antenna vertical height to SHMP(Slant Height Measurement Point) = sqrt(sqr(1.383) - sqr(0.08875)) = 1.3801m.
Distance from SHMP to ARP (Antenna Reference Point) = 0.0544m (see attachment).
Antenna vertical height to ARP = 1.3801 - 0.0544 = 1.3257m.

String
Antenna is slant; Height = 1.38 COMMENT
is comment and no more.

 

[S.Szyszkoski]

Ah, I did not realize that it was being brought down to the ARP. I'm still living in the Z-12 days, I guess.
Thank you.

 

[Alexey Razumovsky]

Not bad days. We were more then 20 years younger.