Injecting an arbitrary IQ stream into a test environment
Disclosed is incorporating an IQ stream into a test signal for a receiver in motion, configuring a path for the motion of the receiver during simulation, a period of the simulation, a transmitter constellation to emulate, and a path of at least one IQ stream transmitter. Also generating signals emulating the transmitter constellation and conditioning the stream to be merged with the signals, using distance and relative motion between receiver and transmitter to determine delay and Doppler shift between transmitter and receiver in motion, scheduling sampling of the signal, including interpolation among samples of the stream, based on delay and Doppler shift, and synthesizing a conditioned stream from the interpolation between the samples, taking into account signal level of the stream, in addition to delay and shift, and merging the conditioned signal with the signals emulating the transmitter constellation and supplying the merged signals to the receiver during the test.
1. A method of incorporating an IQ stream into a test signal used to test a receiver in motion, wherein the IQ stream represents an interference transmitter without representing the motion of the receiver in motion, the method including:
configuring the test, including:
configuring a path for the motion of the receiver during simulation;
configuring a period of the simulation that includes time corresponding to start time;
configuring at least one transmitter constellation to emulate during the simulation; and
configuring a location of or path for motion of at least one IQ stream transmitter of the IQ stream during the simulation;
generating signals emulating the transmitter constellation;
conditioning the IQ stream to be merged with the signals emulating the transmitter constellation, including:
using distance and relative motion between the receiver and the IQ stream transmitter to determine delay and Doppler frequency shift between the IQ stream transmitter and the receiver in motion;
scheduling sampling of the IQ stream, including interpolation among samples of the IQ stream, taking into account the delay and the Doppler frequency shift; and
synthesizing a conditioned IQ stream from the interpolation among the samples, further taking into account signal level of the conditioned IQ stream, in addition to the delay and the Doppler frequency shift;
merging the conditioned IQ stream with the signals emulating the transmitter constellation; and
supplying the merged signals to the receiver during the test.
2. The method of claim 1 , wherein the transmitter constellation is at least one constellation of GNSS or other positioning satellite transmitters.
3. The method of claim 1 , wherein the transmitter constellation is a plurality of ground based transmitters of cellular signals.
4. The method of claim 1 , wherein the transmitter constellation is a plurality of ground based transmitters of Wi-Fi signals.
5. The method of claim 1 , wherein the IQ stream represents a jamming signal.
6. The method of claim 1 , wherein the IQ stream represents an interference signal.
7. The method of claim 1 , further including a start time with the IQ stream.
8. The method of claim 1 , further including a plurality of IQ stream transmitters with distances and relative motions corresponding to satellites.
9. A non-transitory computer readable storage medium loaded with program instructions that, when executed on processors, cause the processors to become operable to perform a method of incorporating an IQ stream into a test signal used to test a receiver in motion, wherein the IQ stream represents an interference transmitter without representing the motion of the receiver in motion, the method including:
configuring the test, including:
configuring a path for the motion of the receiver during simulation;
configuring a period of the simulation that includes time corresponding to start time;
configuring at least one transmitter constellation to emulate during the simulation; and
configuring a location of or path for motion of at least one IQ stream transmitter of the IQ stream during the simulation;
generating signals emulating the transmitter constellation;
conditioning the IQ stream to be merged with the signals emulating the transmitter constellation, including:
using distance and relative motion between the receiver and the IQ stream transmitter to determine delay and Doppler frequency shift between the IQ stream transmitter and the receiver in motion;
scheduling sampling of the IQ stream, including interpolation among samples of the IQ stream, taking into account the delay and the Doppler frequency shift; and
synthesizing a conditioned IQ stream from the interpolation among the samples, further taking into account signal level of the conditioned IQ stream, in addition to the delay and the Doppler frequency shift;
merging the conditioned IQ stream with the signals emulating the transmitter constellation; and
supplying the merged signals to the receiver during the test.
10. The non-transitory computer readable storage medium of claim 9 , wherein the transmitter constellation is at least one constellation of GNSS or other positioning satellite transmitters.
11. The non-transitory computer readable storage medium of claim 9 , wherein the transmitter constellation is a plurality of ground based transmitters of cellular signals.
12. The non-transitory computer readable storage medium of claim 9 , wherein the transmitter constellation is a plurality of ground based transmitters of Wi-Fi signals.
13. The non-transitory computer readable storage medium of claim 9 , wherein the IQ stream represents a jamming signal.
14. The non-transitory computer readable storage medium of claim 9 , wherein the IQ stream represents an interference signal.
15. The non-transitory computer readable storage medium of claim 9 , further including a start time with the IQ stream.
16. The non-transitory computer readable storage medium of claim 9 , further including a plurality of IQ stream transmitters with distances and relative motions corresponding to satellites.
17. A system comprising one or more computing devices with processors, memory coupled to the processors and program instructions from the non-transitory computer readable storage medium of claim 9 loaded into the memory.
18. The system of claim 17 , wherein the transmitter constellation is at least one constellation of GNSS or other positioning satellite transmitters.
19. The system of claim 17 , wherein the transmitter constellation is a plurality of ground based transmitters of cellular signals.
20. The system of claim 17 , wherein the transmitter constellation is a plurality of ground based transmitters of Wi-Fi signals.
21. The system of claim 17 , wherein the IQ stream represents one of a jamming signal and an interference signal.
22. The system of claim 17 , further including a start time with the IQ stream.
23. The system of claim 17 , further including a plurality of IQ stream transmitters with distances and relative motions corresponding to satellites.