Polysynchronous constellation design

Apparatus and methods for determining orbital parameters for spacecraft are provided. A computing device can receive a first plurality of orbital parameters defining a first orbit by a first spacecraft of a particular object. The first orbit can have a corresponding first ground track over the particular object. The computing device can receive a following time for a second spacecraft. The computing device can determine a second plurality of orbital parameters for a second orbit by the second spacecraft of the particular object based on the first plurality of orbital parameters and the following time. The second orbit can have a corresponding second ground track over the particular object that follows the first ground track. The computing device can generate an output that includes the second plurality of orbital parameters.

Polysynchronous Constellation Design

Apparatus and methods for determining orbital parameters for spacecraft are provided. A computing device can receive a first plurality of orbital parameters defining a first orbit by a first spacecraft of a particular object. The first orbit can have a corresponding first ground track over the particular object. The computing device can receive a following time for a second spacecraft. The computing device can determine a second plurality of orbital parameters for a second orbit by the second spacecraft of the particular object based on the first plurality of orbital parameters and the following time. The second orbit can have a corresponding second ground track over the particular object that follows the first ground track. The computing device can generate an output that includes the second plurality of orbital parameters.

SYSTEMS AND METHODS FOR SCREENING

A screening system for solid removal includes a housing and a screen positioned within the housing. A flow inlet is operatively connected to an interior chamber defined by the screen. A sump is downstream from the flow inlet for capturing solids that do not pass through the screen. A flow outlet is downstream from the screen in fluid communication with the flow inlet. A moveable cleaning assembly may be positioned either within a perimeter of the screen, around the perimeter of the screen or both. The moveable cleaning assembly is moveable with respect to the screen. 1. A screening system for solid removal comprising:a housing;a screen positioned within the housing;a flow inlet operatively connected to an interior chamber defined by the screen;a sump downstream from the flow inlet for capturing solids that do not pass through the screen;a flow outlet downstream from the screen in fluid communication with the flow inlet; anda moveable cleaning assembly positioned either within a perimeter of the screen, around the perimeter of the screen or both, wherein the moveable cleaning assembly is moveable with respect to the screen.2. The screening system as recited in claim 1 , wherein the moveable cleaning assembly includes a ring and a series of nozzles circumferentially disposed around the ring.3. The screening system as recited in claim 1 , wherein the screen extends from a top to a bottom claim 1 , wherein the nozzles are angled in a direction toward the bottom of the screen.4. The screening system as recited in claim 1 , wherein the moveable cleaning assembly includes a downwardly extending member claim 1 , wherein the downwardly extending member includes at least one nozzle.5. The screening system as recited in claim 4 , wherein the downwardly extending member is a center member positioned within the perimeter of the screen along a central longitudinal axis defined by the screen.6. The screening system as recited in claim 5 , wherein the center member is mounted for ...

DEWATERING SYSTEMS AND METHODS

A dewatering system for removing solids from an influent includes a filtration assembly and a feed pipe upstream thereof. The dewatering system includes a solids receptacle downstream of the filtration assembly, and an effluent collector adjacent to the filtration assembly and in fluid communication with the filtration assembly. The dewatering system includes a sensor to sense a characteristic of an influent, an effluent and/or a solid. A control system is operatively connected to the sensor to receive a sensor signal therefrom and to generate an adjustment signal based on the sensor signal to improve the efficiency of the dewatering system. 1. A dewatering system for removing solids from an influent comprising:a filtration assembly;a feed pipe upstream from the filtration assembly;a solids receptacle downstream of the filtration assembly;an effluent collector adjacent to the filtration assembly in fluid communication with the filtration assembly;a sensor configured to sense a characteristic of at least one of an influent, an effluent or a solid; anda control system operatively connected to the sensor to receive a sensor signal therefrom and to generate an adjustment signal based on the sensor signal to improve the efficiency of the dewatering system.2. The system as recited in claim 1 , wherein the sensor is operatively connected to a conduit upstream from the filtration assembly and downstream from the feed pipe claim 1 , and wherein the sensor is a light sensor used to measure at least one of an amount of suspended solids in an influent claim 1 , a degree of homogeneity in an influent claim 1 , a degree of flocculation of solids in an influent claim 1 , or a size of flocculated solid nodules in an influent.3. The system as recited in claim 1 , wherein the sensor is operatively connected to the feed pipe and measures at least one of a density claim 1 , an amount of suspended solids claim 1 , turbidity claim 1 , or a flow rate of an influent.4. The system as ...

Dewatering systems and methods

A dewatering system (100) for removing solids from an influent includes a filtration assembly (106) and a feed pipe (104) upstream thereof. The dewatering system includes a solids receptacle (114) downstream of the filtration assembly (106), and an effluent collector (116) adjacent to the filtration assembly (106) and in fluid communication with the filtration assembly (106). The dewatering system (100) includes a sensor (118a-h) to sense a characteristic of an influent, an effluent and/or a solid. A control system (120) is operatively connected to the sensor (118a-h) to receive a sensor signal therefrom and to generate an adjustment signal based on the sensor signal to improve the efficiency of the dewatering system (100).

Systems and methods for screening

A screening system for solid removal includes a housing and a screen positioned within the housing. A flow inlet is operatively connected to an interior chamber defined by the screen. A sump is downstream from the flow inlet for capturing solids that do not pass through the screen. A flow outlet is downstream from the screen in fluid communication with the flow inlet. A moveable cleaning assembly may be positioned either within a perimeter of the screen, around the perimeter of the screen or both. The moveable cleaning assembly is moveable with respect to the screen.

Systems and methods for screening

A screening system for solid removal includes a housing and a screen positioned within the housing. A flow inlet is operatively connected to an interior chamber defined by the screen. A sump is downstream from the flow inlet for capturing solids that do not pass through the screen. A flow outlet is downstream from the screen in fluid communication with the flow inlet. A moveable cleaning assembly may be positioned either within a perimeter of the screen, around the perimeter of the screen or both. The moveable cleaning assembly is moveable with respect to the screen.

Systems and methods for screening