strf | Radio Frequency Satellite Tracking | Navigation library
kandi X-RAY | strf Summary
kandi X-RAY | strf Summary
strf is the satellite tracking toolkit for radio observations (RF). The software is designed to allow tracking of satellites from radio observations, using Doppler curves to identify satellites and/or determine their orbits. The software is designed for linux operating systems, and will work with most software defined radios (SDRs), certainly those that are supported by The software comes with tools for data acquisition, performing FFTs to generate timestamped spectrograms (waterfall plots), and analysis, to extract and analyse Doppler curves.
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QUESTION
This system call code is not working at all. The compiler is optimizing things out and generally behaving strangely:
...ANSWER
Answered 2022-Mar-12 at 16:57It's not loading a0 with the buffer at sp.
Because you didn't ask for a pointer as an "r"
input in a register. The one and only guaranteed/supported behaviour of T foo asm("a0")
is to make an "r"
constraint (including +r or =r) pick that register.
But you used "m"
to let it pick an addressing mode for that buffer, not necessarily 0(a0)
, so it probably picked an SP-relative mode. If you add asm comments inside the template like "ecall # 0 = %0 1 = %1 2 = %2"
you can look at the compiler's asm output and see what it picked. (With clang, use -no-integrated-as
so asm comments in the template come through in the -S
output.)
Wrapping a system call does need the pointer in a specific register, i.e. using "r"
or +"r"
QUESTION
In vue.js 2.0 I'm trying to make a compute a class like this:
...ANSWER
Answered 2021-Sep-11 at 02:12When you use v-bind
, it expects a valid javascript expression, but 'str1' calcStarClass(1, p.rtg)
is not a valid javascript expression. Use +
to concatenate multiple classes if that's what you need:
QUESTION
I have this bot that checks everytime someone sends a message using an on_message
event and for some reason the other commands that the bot has seem to be ignored.
I figured that out after removing the function of checking the msgs and the commands work pretty fine.
Here is the on_message
event code:
ANSWER
Answered 2021-Jul-10 at 15:38You need to add await client.process_commands(message)
to the end of your on_message coroutine.
As the docs state:
By default, this coroutine is called inside the on_message() event. If you choose to override the on_message() event, then you should invoke this coroutine as well.
QUESTION
I was trying to select all the columns in the table where the "month" and "year" are the same. The method rawQuery(query,args) receive an array of string[] with the a query that replaces the camps with "?".
This was some of my attempts:
...ANSWER
Answered 2021-Jul-02 at 15:34Your first attempt is dangerous. This will open your app for a SQL injection attack. For a local database that only has one user, this probably isn't a big deal. But you should get in the habit of using bound parameters as in the second query.
The problem is that you can only use ?
as a place holder for the entire value, so your query should be:
QUESTION
I have following Dataframe in R.
...ANSWER
Answered 2021-May-08 at 18:50You need some sort of string-parsing function that also handles the aggregation:
QUESTION
I have three large tables (employee_info, driver_info, school_info) that I have joined together on common attributes using a series of LEFT OUTER JOIN
operations. After each join, the resulting number of records increased slightly, indicating that there are duplicate IDs in the data. To try and find all of the duplicates in the IDs, I dumped the ID columns into a temp table like so:
In this overly simplified example, you will see that IDs 1234
(employee_id), strf
(driver_id), and aaaa
(school_id) are each duplicated at least once. I would like to add a count column for each of the ID columns, and populate them with the count for each ID used, like so:
You can see that IDs 1234
and strf
each have 2 in the count, and aaaa
has 3. After generating this table, my goal is to pull out all records where any of the counts are greater than 1, like so:
In my real-world work, the JOIN'd table contains 100 columns, 15 different ID fields and over 30,000 records, and the final table came out to be 28 more than the original. This may seem like a small amount, but each of the 28 represent a broken link that we must fix.
Is there a simple way to get the counts populated like in the second table above? I have been wrestling with this for hours already, and have not been able to make this work. I tried some aggregate functions, but they cannot be used in table UPDATE operations.
...ANSWER
Answered 2021-Mar-01 at 03:54The COUNT
function, when used as an analytic function, can do what you want here, e.g.
QUESTION
within a dataset, there are several different datetime-strings.
For example:
2020-11-16T06:00:00Z
2020-11-16T06:00:00+01:00
2020-11-16T06:00:00+01:00Z
2020-11-16T06:00:00+02:00
2020-11-16T06:00:00.000Z
I thought about replacing everything after the seconds, but it gives me errors, when for example +01:00 isn't given in the first place.. or else.
Do you have any clou, how to handle this?
It would be absolutely enough, if I could get:
%Y-%m-%dT%H:%M
(The basics, how to strp and strf are known...)
I've wrangled my head all night about this problem. Hope, that one of you have got a solution...
thank you in advance!
...ANSWER
Answered 2020-Nov-16 at 05:26Python has a standard library that deals with this problem:
QUESTION
Overall aim: Parse a string in GMT as a time using jq
and output both a formatted time and the difference of that time to "now". However, jq
s (version 1.6, Debian testing) timezone handling seems very confused to me:
ANSWER
Answered 2020-Jul-04 at 21:36This probably isn't the answer you're looking for but it might clear some things up. builtin.jq defines
QUESTION
How can I break down a string by spaces? I’m used to taking data before/after a word or special character or a space. However I’m working on a decoder app where my string would look like:
...This is a downloaded code that would be set to a string: “09627189762”
ANSWER
Answered 2020-Apr-19 at 09:19You can use a regular expression to split your input string into constant-length parts. In the example below, each (\\d{X})
part of the pattern means "match a sequence of X digits".
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