MOTION DETECTION SYSTEM AND METHOD OF A BUILDING AUTOMATION SYSTEM

1 . A motion detection system of a building automation system comprising:

a motion sensing component configured to generate a raw signal;

a low pass filter generates filtered first-order difference signals based on the first-order difference signals; and

a processor configured to establish first-order difference signals based on the raw signal, identify in-band energy in an motion portion of a sensor frequency range based on the filtered first-order difference signals, identify total energy in the sensor frequency range based on the first-order difference signals, determine a ratio of the in-band energy and the total energy, and generate a motion status update in response to determining that the ratio meets or exceeds a predetermined ratio threshold,

wherein the processor is further configured to apply dead zone shifting to the first-order difference signals in response to an interference transmission.

2 . The motion detection system as described in claim 1 , wherein the processor applies dead zone shifting to the first-order difference signals by reducing larger values of the first-order difference signals and suppressing smaller values of the first-order difference signals in response to an interference transmission.

3 . The motion detection system as described in claim 1 , wherein, in response to continuous same values of the first-order difference signal, the processor scales the first-order difference signal by a predetermined scale value and randomly modifies the first-order difference signal in response to at least one of a ratio, a half size, or a mode.

4 . The motion detection system as described in claim 1 , wherein the processor skips a plurality of samples in synchronous with a radio transmission not associated with the motion sensing component.

5 . The motion detection system as described in claim 1 , wherein:

the processor determines the ratio of the in-band energy and the total energy by applying windowing to the first-order difference signals to reduce a transient effect of the low pass filter.

6 . A method for a motion detection system of a building automation system, the method comprising:

receiving raw signal from a motion sensing component of the building automation system;

establishing first-order difference signals based on the raw signal;

establishing filtered first-order difference signals based on the first-order difference signals;

identifying in-band energy in an motion portion of a sensor frequency range based on the filtered first-order difference signals, identifying the in-band energy including applying dead zone shifting to the filtered first-order difference signals in response to an interference transmission;

identifying total energy in the sensor frequency range based on the first-order difference signals;

determining a ratio of the in-band energy and the total energy; and

generating a motion status update in response to determining that the ratio meets or exceeds a predetermined ratio threshold.

7 . The method as described in claim 6 , wherein applying the dead zone shifting to the first-order difference signals includes reducing larger values of the first-order difference signals and suppressing smaller values of the first-order difference signals.

8 . The method as described in claim 6 , further comprising:

scaling the first-order difference signal by a predetermined scale value; and

modifying randomly the first-order difference signal in response to at least one of a ratio, a half size, or a mode.

9 . The method as described in claim 6 , further comprising skipping a plurality of samples in synchronous with a radio transmission not associated with the motion sensing component.

10 . The method as described in claim 6 , wherein:

determining the ratio of the in-band energy and the total energy includes applying windowing to the first-order difference signals to reduce a transient effect of a low pass filter.

11 . A motion detection system of a building automation system comprising:

a motion sensing component configured to generate a raw signal;

a low pass filter generates filtered first-order difference signals based on the first-order difference signals; and

a processor configured to establish first-order difference signals based on the raw signal, identify in-band energy in an motion portion of a sensor frequency range based on the filtered first-order difference signals, identify total energy in the sensor frequency range based on the first-order difference signals, determine a ratio of the in-band energy and the total energy, and generate a motion status update in response to determining that the ratio meets or exceeds a predetermined ratio threshold,

wherein the processor is further configured to apply windowing to the filtered first-order difference signals.

12 . The motion detection system as described in claim 11 , wherein the processor identifies the in-band energy in the motion portion of the sensor frequency range by applying the windowing to the filtered first-order difference signals to reduce a transient effect of the low pass filter.

13 . The motion detection system as described in claim 11 , wherein, in response to continuous same values of the first-order difference signal, the processor scales the first-order difference signal by a predetermined scale value and randomly modifies the first-order difference signal in response to at least one of a ratio, a half size, or a mode.

14 . The motion detection system as described in claim 11 , wherein the processor skips a plurality of samples in synchronous with a radio transmission not associated with the motion sensing component.

15 . The motion detection system as described in claim 11 , wherein the processor applies dead zone shifting to the first-order difference signals in response to an interference transmission.

16 . The motion detection system as described in claim 15 , wherein the processor applies the dead zone shifting by reducing larger values of the first-order difference signals and suppressing smaller values of the first-order difference signals.

17 . A method for a motion detection system of a building automation system, the method comprising:

receiving raw signal from a motion sensing component of the building automation system;

establishing first-order difference signals based on the raw signal;

establishing filtered first-order difference signals based on the first-order difference signals;

identifying in-band energy in an motion portion of a sensor frequency range based on the filtered first-order difference signals, identifying the in-band energy including applying windowing to the filtered first-order difference signals;

identifying total energy in the sensor frequency range based on the first-order difference signals;

determining a ratio of the in-band energy and the total energy; and

generating a motion status update in response to determining that the ratio meets or exceeds a predetermined ratio threshold.

18 . The motion detection system as described in claim 17 , wherein applying the windowing to the filtered first-order difference signals includes applying the windowing to the filtered first-order difference signals to reduce a transient effect of a low pass filter.

19 . The motion detection system as described in claim 17 , further comprising:

scaling the first-order difference signal by a predetermined scale value; and

modifying randomly the first-order difference signal in response to at least one of a ratio, a half size, or a mode.

20 . The motion detection system as described in claim 17 , further comprising skipping a plurality of samples in synchronous with a radio transmission not associated with the motion sensing component.

21 . The motion detection system as described in claim 17 , wherein identifying the in-band energy in the motion portion of the sensor frequency range includes applying dead zone shifting to the first-order difference signals in response to an interference transmission.

22 . The motion detection system as described in claim 21 , wherein applying the dead zone shifting to the first-order difference signals includes reducing larger values of the first-order difference signals and suppressing smaller values of the first-order difference signals.