We are pleased to announce that we have made a massive update to Digital Elevation Matrix (DEM) for North America, Europe, Australia, and New Zealand.

For North America, 1 Arc-second Digital Elevation Model USGS National Map 3DEP is now used.

Coverage: USA, Canada, Mexico.

Source: https://data.usgs.gov/datacatalog/data/USGS:35f9c4d4-b113-4c8d-8691-47c428c29a5b

We now use data from open digital terrain models (DTM) from national geoservices for the following European countries:

  • Austria (DTM 5-10 meters)

  • Belgium (DTM 5-10 meters)

  • Denmark (DTM 1.6 meters)

  • Estonia (DTM 10 meters)

  • Finland (DTM 10 meters)

  • France (DTM 5-10 meters)

  • Germany (DTM 2-25 meters)

  • Iceland (DTM 10 meters)

  • Italy (DTM 2-10 meters)

  • Latvia (DTM 20 meters)

  • Liechtenstein (DTM 10 meters)

  • Luxembourg (DTM 5 meters)

  • Netherlands (DTM 5 meters)

  • Norway (DTM 10 meters)

  • Slovakia (DTM 10 meters)

  • Slovenia (DTM 1 meters)

  • Spain (DTM 2-5 meters)

  • Sweden (DTM 50 meters)

  • Switzerland (DTM 2 meters)

  • United Kingdom (DTM 2-50 meters)

For the rest of Europe, the European Digital Elevation Model (EU-DEM), version 1.1 is now used.

Coverage: Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czechia, Greece, Hungary, Kosovo, Lithuania, Malta, Montenegro, North Macedonia, Poland, Portugal, Romania, Serbia, Turkey.

Source: https://land.copernicus.eu/imagery-in-situ/eu-dem/eu-dem-v1.1?tab=metadata

For Australia, SRTM-derived 1 Second Digital Elevation Models Version 1.0 (DEM-S) is now used.

Coverage: Australia

Source: https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/72759

For New Zealand, the New Zealand National Digital Elevation Model a 25-meter resolution is now used.

Coverage: New Zealand

Source: https://lris.scinfo.org.nz/layer/48131-nzdem-north-island-25-metre/

https://lris.scinfo.org.nz/layer/48127-nzdem-south-island-25-metre/

The new DEMs have higher accuracy compared to SRTM, which was previously used for these regions. This will allow for more reliable coverage and link predictions.


Attention! To use these new DEMs you need to delete the old DEM cache files that are stored on the computer.


For MLinkPlanner please clean the folder: C:\Users\user\AppData\Roaming\MLinkPlanner2\data\

For RadioPlanner please clean the folder:

C:\Users\user\AppData\Roaming\RadioPlanner\data\

For the rest of the regions, the SRTM Worldwide Elevation Data (1-arc-second Resolution SRTM Plus V3) matrix is ​​still used.

We also plan to update geodata in the future.

134 views0 comments


The Google Planet Earth KMZ file, which can be exported from MLinkPlanner, now includes sites as well as Point-to-Point and Point-to-Multipoint links.

114 views0 comments


In May 2021, we carried out test measurements of signal levels from the base station of the conventional radio communication system in VHF and UHF bands (145 MHz and 430 MHz) in suburban/rural and forest areas.


We took these measurements for:

1. Comparative analysis of real measured received power values with the signal levels predicted in RadioPlanner 2.1

2. Comparison of the attenuation in different clutter types obtained experimentally with the attenuation values determined for the corresponding clutter type according to the recommendation ITU-R P.1814.


Test base station: Baofeng DM-1701 radio station operating in analog mode with an output power of 2-2.5 W, OPEK UVS-100 dual-band OMNI antenna, RG-6 cable. The transmitter output power, antenna VSWR, and cable attenuation were monitored for each frequency band before testing with Supercom SW-102 power meter and NanoVIVA-F vector analyzer.


Transmitter power measurement


Measuring the SWR of the transmitter


BS antenna


Measuring cable loss



Mobile measuring station: SignalHound USB-SA44B spectrum analyzer/measuring receiver, USB GPS receiver, OPEK VH-1210 (for 145 MHz) and OPEK UH-411 (for 430 MHz) antennas, laptop with proprietary measurement software. During the tests, the antenna of the mobile station was placed on the roof of the car.



Measuring mobile station



UHF antenna and GPS receiver on the car roof

Measurement track recording


We did not have an opportunity to place the BS antenna so that it was at a dominant height relative to the entire clutter. The antenna phase center was at a level of 9 m from the ground. This somewhat violates the scheme adopted for calculations in RadioPlanner, when clutter losses are taken into account only on the mobile station side. But, given that in a radius of up to 400-500 m from the BS, almost the entire clutter was below the antenna height, we assumed that this should not strongly affect the result.


Measurement area - rural area near the Beloyarka, Novosibirsk region. This is a flat territory with absolute values of terrain heights from 90 to 200 m with dense forests and low residential buildings with a height of 4-7 m.


Typical local woodland


Typical local settlement


For each frequency band, several test runs were performed, then, for the convenience of analysis, the tracks for one frequency band were combined, and, as a result, two tracks were obtained - for the VHF and UHF, with several thousand measurement points in each.


Measurement racks:



The prediction of receive power levels in RadioPlanner 2.1 was carried out using the ITU-R P.1812-4 propagation model with the exclusion of the location and time variability component (percentage of location and time = 50%).


Propagation model parameters:




























Screenshots comparing measured and calculated receive power levels:






The analysis results were summarized in two tables for each of the frequency band:





Our conclusions based on the results of comparison of measurements and predictions in RadioPlanner:


1. The standard deviation of the measured values of the signal levels and levels predicted in RadioPlanner 2.1 for different clutter types is in the range of 4.6-7.6 dB. This is a pretty good result for a predictive tool that also shows the relevance of the ITU-R P.1812-4 propagation model and the spatial datasets used - DEM and clutter.


2. The obtained absolute clutter loss values, typical for rural and forest areas, are practically the same for the VHF and UHF bands.


3. For forest areas - forest and roads in the forest, the absolute clutter loss values obtained as a result of measurements, with an accuracy of 1-3 dB, coincide with the corresponding losses calculated according to ITU-R P.1812-4.


4. On an "open space" type clutter, measurements show additional attenuation of 9-11 dB. This can be explained by the fact that this is an area surrounded on all sides by a forest, despite the fact that locally a clutter in them is identified as an "open space."


5. The measured attenuation in the suburban clutter is 3-6 dB higher than that determined in ITU-R P.1812-4. We believe that this may be the result of the fact that the BS antenna was located just in a suburban clutter at a height only slightly higher than the average clutter height.


General conclusion:

The comparative analysis showed good agreement between the measured values and the values of the signal levels predicted in RadioPlanner 2.1 in the VHF and UHF bands.


173 views0 comments
1
2