Systems and methods for flexible time based waveform synthesis
The present application at least describes a method for waveform synthesis. The method may include a step of transmitting a stimulus signal to a software defined radio (SDR) operating in a first state. The method may also include a step of receiving, via the SDR, an output signal based upon the transmitted stimulus signal. The method may also include a step of. determining, based upon the received output signal, a delay state of the SDR from a plurality of predetermined delay states of the SDR. The delay state may be associated with a parameter of the SDR. The parameter may include any one or more of a receive frequency, transmit frequency or bandwidth. The method may further include a step of generating a calibrated signal based upon the determined delay state. The method may even further include a step of sending the calibrated signal to the SDR to adjust a time.
1 . A method comprising:
transmitting a stimulus signal to a software defined radio (SDR) operating in a first state;
receiving, via the SDR, an output signal based upon the transmitted stimulus signal;
determining, based upon the received output signal, a delay state of the SDR from a plurality of predetermined delay states of the SDR, wherein the delay state includes a range between 12.5 ps/° C. and −3.5 ps/° C., wherein the delay state is associated with a parameter of the SDR, and wherein the parameter includes any one or more of a receive frequency, transmit frequency or bandwidth;
generating a calibrated signal based upon the determined delay state; and
sending the calibrated signal to the SDR, wherein the calibrated signal causes the SDR to adjust its time and operate in a second state.
2 . The method of claim 1 , further comprising:
receiving another output signal from the SDR operating in the second state; and
determining, based upon the received other output, another delay state of the SDR from the plurality of predetermined delay states of the SDR.
3 . The method of claim 2 , further comprising:
generating another calibrated signal based upon the other state; and
transmitting the other calibration signal to the SDR for operating in a third state.
4 . The method of claim 1 , wherein the predetermined delay states are obtained by:
collecting, prior to the transmitting step, a plurality of signals output from the SDR; and
characterizing the parameter for each of the collected signals.
5 . The method of claim 1 , wherein the stimulus signal includes a radio frequency signal and a pulse per second (PPS) signal.
6 . The method of claim 1 , wherein the stimulus signal includes a global navigation satellite system (GNSS) waveform.
7 . The method of claim 1 , where the calibrated signal is a function of an operating temperature of the SDR.
8 . The method of claim 1 , wherein the calibrated signal is a sub-nanosecond signal measured in picoseconds.
9 . A system comprising:
non-transitory memory including instructions stored thereon; and
a processor operably coupled to the non-transitory memory, wherein the processor is configured to execute the instructions including:
causing a transmission of a stimulus signal to a software defined radio (SDR) operating in a first state;
causing a reception of an output signal from the SDR based upon the transmitted stimulus signal;
determining, based upon the received output signal, a delay state of the SDR from a plurality of predetermined delay states of the SDR, wherein the delay state is associated with a parameter of the SDR, and wherein the delay state includes a range between 12.5 ps/° C. and −3.5 ps/° C.; and
causing to generate a calibrated signal based upon the determined delay state.
10 . The system of claim 9 , wherein the processor is further configured to execute the instructions of causing to send the calibrated signal to the SDR.
11 . The system of claim 9 , further comprising:
a signal generator and a clock/calibration module.
12 . The system of claim 11 , wherein the processor, the signal generator and the clock/calibration module are housed in a single casing.
13 . The system of claim 9 , wherein the parameter includes any one or more of a receive frequency, transmit frequency or bandwidth.
14 . A system comprising a software defined radio (SDR), wherein the SDR is configured to execute a set of instructions including:
sending, while in a first state, an output signal to a remote system, wherein the output signal indicates a delay state associated with a parameter of the SDR, wherein the delay state includes a range between 12.5 ps/° C. and −3.5 ps/° C.;
receiving, from the remote system, a calibrated signal; and
updating, based upon the calibrated signal, to a second state from the first state.
15 . The system of claim 14 , further comprising a satellite encasing the SDR.
16 . The system of claim 14 , wherein the system operates at a temperature ranging between −20° C. and 50° C.
17 . The system of claim 16 , wherein an internal pressure of the system is about 10 −5 Torr.
18 . The system of claim 14 , wherein the parameter includes any one or more of a receive frequency, transmit frequency or bandwidth.
19 . The system of claim 14 , where the calibrated signal is a function of an operating temperature of the SDR.