Envelope regulation in a frequency-modulated continuous-wave radar system
A radar system that can block false echoes includes: a local oscillator configured to generate a chirp signal comprising a plurality of chirps, each having a corresponding envelope; a transmitter configured to transmit a signal corresponding to the chirp signal; and a modulation circuit configured to modulate the transmitted signal by regulating a magnitude of one or more portions of the chirp envelopes in a predetermined pattern such that the radar system can discern false echoes which do not match the pattern.
1. A transceiver system, comprising:
a local oscillator configured to generate a chirp signal, wherein the chirp signal comprises a plurality of chirps, and wherein each of the chirps has a corresponding envelope;
a transmitter, wherein the transmitter is configured to transmit a signal corresponding to the chirp signal; and
a modulation circuit, wherein the modulation circuit is configured to modulate the transmitted signal by regulating a magnitude of one or more portions of the chirp envelopes in a predetermined pattern, wherein the modulation suppresses a non-linear portion of the transmitted signal to zero or a fixed value.
2. The transceiver system of claim 1 , further comprising:
a receiver configured to detect one or more signals; and
a processor configured to determine whether one or more detected signals has a pattern which matches the predetermined pattern of the transmitted signal.
3. The transceiver system of claim 1 , wherein regulating the magnitude of one or more portions of the chirp envelopes in the predetermined pattern comprises:
setting a magnitude of one or more first envelopes in accordance with a first integer value; and
setting a magnitude of one or more second envelopes in accordance with a second integer value,
wherein the first integer value is different from the second integer value.
4. The transceiver system of claim 3 , wherein the first integer value and the second integer value correspond to binary numbers.
5. The transceiver system of claim 1 , wherein each of the chirps has a corresponding width, and wherein the modulation circuit is further configured to truncate a width of one or more of the chirps by imposing a rectangular wave on the chirp signal.
6. The transceiver system of claim 1 , wherein the non-linear portion of the transmitted signal is associated with resettling.
7. The transceiver system of claim 1 , wherein each of the chirps has a corresponding width, and wherein the modulation circuit is further configured to truncate a width of one or more of the chirps by applying a window function to the chirp signal.
8. A signal modulation method, comprising:
generating a chirp signal using a local oscillator, wherein the chirp signal comprises a plurality of chirps, and wherein each of the chirps has a corresponding envelope;
transmitting, using a transmitter, a signal corresponding to the chirp signal; and
a modulating the transmitted signal, using a modulation circuit, wherein modulating the transmitted comprises regulating a magnitude of one or more portions of the chirp envelopes in a predetermined pattern, wherein the modulation suppresses a non-linear portion of the transmitted signal to zero or a fixed value.
9. The signal modulation method of claim 8 , further comprising:
detecting one or more signals at a receiver; and
determining, at a processor, whether one or more detected signals has a pattern which matches the predetermined pattern of the transmitted signal.
10. The signal modulation method of claim 8 , wherein regulating the magnitude of one or more portions of the chirp envelopes in the predetermined pattern comprises:
setting a magnitude of one or more first envelopes in accordance with a first integer value; and
setting a magnitude of one or more second envelopes in accordance with a second integer value,
wherein the first integer value is different from the second integer value.
11. The signal modulation method of claim 10 , wherein the first integer value and the second integer value correspond to binary numbers.
12. The signal modulation method of claim 8 , the method further comprising reducing a width of one or more of the chirps by imposing a rectangular wave on the chirp signal.
13. The signal modulation method of claim 8 , wherein the non-linear portion of the transmitted signal is associated with resettling.
14. The signal modulation method of claim 8 , further comprising reducing a width of one or more of the chirps by applying window function to the chirp signal.
15. A non-transitory computer-readable storage medium for use with an electronic device, the computer-readable storage medium storing instructions executable by a processor, wherein, when executed by the processor, the instructions cause the electronic device to perform operations comprising:
generating a chirp signal using an oscillation circuit, wherein the chirp signal comprises a plurality of chirps, and wherein each of the chirps has a corresponding envelope;
transmitting a signal corresponding to the chirp signal from a transmitter; and
causing a modulation circuit to modulate the transmitted signal by regulating a magnitude of one or more portions of the chirp envelopes in a predetermined pattern, wherein the modulation suppresses a non-linear portion of the transmitted signal to zero or a fixed value.
16. The non-transitory computer-readable storage medium of claim 15 , wherein the operations further comprise:
detecting one or more signals using a receiver; and
determining whether one or more detected signals has a pattern which matches the predetermined pattern of the transmitted signal.
17. The non-transitory computer-readable storage medium of claim 15 , wherein regulating the magnitude of one or more portions of the chirp envelopes in the predetermined pattern comprises:
setting a magnitude of one or more first envelopes in accordance with a first integer value; and
setting a magnitude of one or more second envelopes in accordance with a second integer value,
wherein the first integer value is different from the second integer value.
18. The non-transitory computer-readable storage medium of claim 17 , wherein the first integer value and the second integer value correspond to binary numbers.
19. The non-transitory computer-readable storage medium of claim 15 , wherein the operations further comprise causing the modulation circuit to truncate a width of one or more of the chirps by imposing a square wave on the chirp signal.
20. The non-transitory computer-readable storage medium of claim 15 , wherein the non-linear portion of the transmitted signal is associated with resettling.
21. The non-transitory computer-readable storage medium of claim 15 , wherein the operations further comprise causing the modulation circuit to truncate a width of one or more of the chirps by applying a window function to the chirp signal.
22. The non-transitory computer-readable storage medium of claim 21 , wherein the window function comprises at least one of a Hann function or a Blackman function.