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HX-CH7604A

Setup

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Fig. 1: VRTK2 with HX-CH7604A

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Fig. 2: CH7604A antenna

Antenna phase center:

image-20240517-114301.png

Test results

Stationary 1

In this test the HX-CH7604A antenna was connected to GNSS2.

image-20240517-115412.png

Number of tracked signals

image-20240517-115507.png

Position variance

image-20240517-115528.png

CN0 timeseries

image-20240517-115555.png

CN0 histogram

image-20240517-115623.png

ENU position estimate statistics

Timeseries file:

antennas1-ch7604a.html

Link to KML file: 2024-05-16-12-40-56

Links to raw GNSS data: GNSS1, GNSS2

Stationary 2

In this test the HX-CH7604A antenna was connected to GNSS1.

image-20240517-115800.png

Number of tracked signals

image-20240517-120054.png

Position variance

image-20240517-115859.png

CN0 timeseries

image-20240517-115919.png

CN0 histogram

image-20240517-115954.png

ENU position estimate statistics

Timeseries file:

antennas2-ch7604a.html

Link to KML file: 2024-05-16-13-10-29

Links to raw GNSS data: GNSS1, GNSS2

Urban canyon
image-20240517-121107.png

Number of tracked signals

image-20240517-121132.png

Fix types

image-20240517-121155.png

Position variance

image-20240517-121218.png

CN0 timeseries

image-20240517-121239.png

CN0 histogram

image-20240517-124514.png

CN0 vs elevation

image-20240517-121306.png

ENU position estimate statistics

Timeseries file:

antennas3-ch7604a.html

Link to KML file: 2024-05-17-08-46-07

Links to raw GNSS data: GNSS1, GNSS2

GNSS outage
image-20240517-121602.png

Number of tracked signals

image-20240517-121631.png

Fix types

image-20240517-121654.png

Position variance

image-20240517-121711.png

CN0 timeseries

image-20240517-121731.png

CN0 histogram

image-20240517-124430.png

CN0 vs elevation

image-20240517-121805.png

ENU position estimate statistics

Timeseries file:

antennas4-ch7604a.html

Link to KML file: 2024-05-17-08-56-49

Links to raw GNSS data: GNSS1, GNSS2

Observations

  • This antenna presents a significantly better stationary performance compared to the AH-3232.

  • This antenna appears to reject some signals at low elevations, which could help with multi-pathing.

  • The time to re-fix was faster in some scenarios.

  • The average C/N0 was slightly lower when moving next to trees, which could be due to the signals rejected at low elevations.

Conclusions

  • This antenna can serve as a replacement to the AH-3232 antenna.

  • Has good performance in all scenarios.

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