From 7cfa1abf1982f6d97b08b33fc604731d1bfc885c Mon Sep 17 00:00:00 2001
From: pistoletpierre <PistoletPierre@github.com>
Date: Fri, 1 Jan 2021 01:42:45 -0500
Subject: [PATCH 1/2] addressing
 https://github.com/osqzss/gps-sdr-sim/issues/268

---
 README.md | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/README.md b/README.md
index b4e7700..5f33ad2 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,29 @@ individual site navigation files into one. The archive for the daily file can
 be downloaded from: https://cddis.nasa.gov/archive/gnss/data/daily/. Access 
 to this site requires registration, which is free.
 
+After registration, automated downloads can be done in a script by adding
+the following entry to one's netrc file (filling in the appropriate values
+for username and password):
+```bash
+echo machine urs.earthdata.nasa.gov login <your username> password <your password> >> ~/.netrc
+```
+
+and then including the following code (or similar) in a script:
+
+```bash
+day=$(date +%j)
+year=$(date +%Y)
+yr=$(date +%y)
+RINEX_NAV_FILE="brdc${day}0.${yr}n"
+curl \
+    --cookie-jar /tmp/cookie \
+    --netrc \
+    --location \
+    --output "${RINEX_NAV_FILE}.gz" "https://cddis.nasa.gov/archive/gnss/data/daily/${year}/brdc/${RINEX_NAV_FILE}.gz" \
+uncompress --force --keep "${RINEX_NAV_FILE}.gz"
+ls -al "${RINEX_NAV_FILE}"
+```
+
 These files are then used to generate the simulated pseudorange and
 Doppler for the GPS satellites in view. This simulated range data is 
 then used to generate the digitized I/Q samples for the GPS signal.

From fb07683a864585827b543837ddba777e0ac2de3f Mon Sep 17 00:00:00 2001
From: pistoletpierre <PistoletPierre@github.com>
Date: Fri, 1 Jan 2021 01:43:37 -0500
Subject: [PATCH 2/2] addressing
 https://github.com/osqzss/gps-sdr-sim/issues/268

---
 README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/README.md b/README.md
index 5f33ad2..a8ae1f7 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,7 @@ the following entry to one's netrc file (filling in the appropriate values
 for username and password):
 ```bash
 echo machine urs.earthdata.nasa.gov login <your username> password <your password> >> ~/.netrc
+chmod 600 ~/.netrc
 ```
 
 and then including the following code (or similar) in a script: