CSP delay model 2.2

JSON schema and example for CSP Mid delay model

CSP delaymodel 2.2

Example JSON

{
    "interface": "https://schema.skao.int/ska-csp-delaymodel/2.2",
    "epoch": 12345678.123456,
    "validity_period": 10.0,
    "delay_details": [{
        "receptor": "SKA001",
        "poly_info": [{
            "polarization": "X",
            "coeffs": [1.01, 1.02, 1.03, 1.04, 1.05, 1.06]
        }, {
            "polarization": "Y",
            "coeffs": [1.1, 1.2, 1.3, 1.4, 1.5, 1.6]
        }]
    }, {
        "receptor": "SKA100",
        "poly_info": [{
            "polarization": "X",
            "coeffs": [1.101, 1.102, 1.103, 1.104, 1.105, 1.106]
        }, {
            "polarization": "Y",
            "coeffs": [1.11, 1.12, 1.13, 1.14, 1.15, 1.16]
        }]
    }]
}

https://schema.skao.int/ska-csp-delaymodel/2.2
type	object
properties
interface	URI of JSON schema applicable to this JSON payload.
	type	string
epoch	Time when delay model becomes valid (when Mid.CBF shall apply the new model) specified as an offset in seconds, expressed as a float number, from 1999-12-31T23:59:28Z UTC (which is called the ‘SKA epoch’). Range: 64-bit number
	type	number
validity_period	validity period of the delay model (starting at epoch) [s] Range: positive number
	type	number
delay_details	type	array
	items	delay details 2.2
additionalProperties	False

delay details 2.2

type	object
properties
receptor	The Receptor (Dish) ID to which the poly_info coeffs apply. Valid receptor IDs include: SKA dishes: “SKAnnn”, where nnn is a zero padded integer in the range of 001 to 133. MeerKAT dishes: “MKTnnn”, where nnn is a zero padded integer in the range of 000 to 063. Range: any string
	type	string
	pattern	^(SKA(00[1-9]|0[1-9][0-9]|1[0-2][0-9]|13[0-3]))| (MKT(0[0-5][0-9]|06[0-3]))$
poly_info	type	array
	items	poly info 2.2
additionalProperties	False

poly info 2.2

type	object
properties
polarization	Polarization of the delay model entry Range: X or Y
	type	string
coeffs	Delay Model is specified as coefficients for a 5th order polynomial. Coefficients of the polynomial are specified as an array. The delay at time t, where t is measured with respect the beginning of the validity interval is calculated as: d(t) = c0 + c1*t + c2*t^2 + c3*t^3 + c4*t^4 + c5*t^5 Units for coefficients c0,c1,..c5: ns/s^k where k=0,1,..5 Range for coefficients: 64 bit number
	type	array
	items	type	number
additionalProperties	False